Watlow FIREROD Specifications

Cartridge/Insertion Heaters

FIREROD® Cartridge Heaters

®

The Watlow
engineering excellence and is supported by almost
60 years of solid industry performance across a broad
range of simple and complex applications. As the premier
choice in swaged cartridge heating, thousands of
industrial manufacturers continue to choose Watlow as
their trusted thermal partner and certified cartridge
heater supplier.

Built using premium materials and tight manufacturing
controls, the FIREROD heater provides superior heat
transfer, uniform temperatures, resistance to oxidation
and corrosion and a long life even at high temperatures.
Every system component that leaves our manufacturing
facilities meets our strict quality assurance specifications,
in addition to those set forth by leading standards and
regulating industries.

FIREROD® cartridge heater incorporates

To meet our customer’s individual needs, there are many
delivery options available for FIREROD heaters.

Performance Capabilities

• Part temperatures up to 1400°F (760°C) on
alloy 800 sheath

• Watt densities up to 400 W/in2 (62 W/cm2)

• Maximum voltage up to 480V

Features and Benefits

Nickel-chromium resistance wire

• Ensures even and efficient distribution of heat to

the sheath
Conductor pins

• Provide a metallurgical bond to the resistance wire

• Ensure a trouble-free electrical connection

Magnesium oxide insulation of specific grain and
purity

• Results in high dielectric strength and contributes to

faster heat-up
Alloy 800 sheath

• Resists oxidation and corrosion from heat, many

chemicals and atmospheres

Minimal spacing between the element wire and
sheath

• Results in lower internal temperature

• Accommodates a design with fewer or smaller heaters

operating at higher watt densities

International Organization for Standardization (ISO)
9001 certified

• Provides confidence that quality and reliability

expectations are met

Sheath

Resistance Wire

End Piece

Lead Wires

Lead Wires

MgO

Insulation

Conductor

Pins

No Heat

Section

UL® and CSA approved flexible stranded wires

• Lead insulation rated to temperatures up to
480°F (250°C)

Patented lead adapter (LA) method

• Allows same day shipment on more than 150,000
configurations of stock FIREROD heaters and lead
combinations

Typical Applications

• Semiconductor chamber heating

• Semiconductor wire and die bonding

• Freeze protection and deicing of equipment in cold
climates or applications

• Humidity control

• Patient comfort heating used in medical devices

• Mold die and platen heating

• Seal bars used in packaging equipment

• Test sample heating in gas chromatography equipment

WATLOW

®

11

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Applications and Technical Data

Tolerances

Diameter

• 1 in. (25 mm) units: ±0.003 in. (±0.08 mm)

• All other units: ±0.002 in. (±0.05 mm)

Sheath Length

• All units up to 41/2 in. (114 mm) long:
±3/32 in. (±2.4 mm)

1

•

/8 in. diameter units over 41/2 in. (114 mm)

long: ±3%

• All other units over 41/2 in. (114 mm) long: ±2%

Length Measurements

Pin Style and Potted FIRERODs

PTFE or
Potted Seal

Heater Length

PTFE - Swaged-in Leads FIRERODs

Wattage

• 1/8 in. units: +10%, -15%

• All other units: +5%, -10%

Resistance

• 1/8 in. units: +15%, -10%

• All other units: +10%, -5%
Resistance changes with temperature. There are three

circumstances under which resistance can be measured:

1. Room temperature (before use): nominal ohms are
90% of Ohm’s law calculation.

2. Room temperature (after use): nominal ohms are
95% of Ohm’s law calculation.

3. At temperature (during use): depending on application
nominal ohms are approximately 100% of Ohm’s law.

Note: Resistance and wattage values are approximate

depending on application conditions.

Component Recognition File Numbers

• UL® component rated to 240VAC

(file number E52951)

• CSA component rated to 240VAC

(file number LR7392)

• VDE component rated to 240VAC

(file number 10062-4911-0006)
Note: Not all options or combinations of options are
covered. UL®, CSA, VDE and CE marking is available
upon request.

12

Heater Length (excludes lead end turnover)

WATLOW

®

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Applications and Technical Data

Dimensional Data

This table shows minimum/maximum sheath lengths for
available FIREROD diameters.

FIREROD Diameter Length

Nominal
in. in. (mm) in. (mm) in. (mm)

1/4 0.246 (6.3) 7/8 (22.2) 36 (915)
3/8 0.371 (9.4) 7/8 (22.2) 48 (1220)
1/2 0.496 (12.6) 7/8 (22.2) 60 (1520)
5/8 0.621 (15.8) 11⁄4 (25.0) 72 (1830)
3/4 0.746 (18.9) 11⁄4 (25.0) 72 (1830)
1 0.996 (25.3) 11/4 (32.0) 72 (1830)

Indicates recommended maximum sheath length; however, longer
lengths may be available.

Actual Min. Max.

1

/8 0.122 (3.1) 7/8 (22.2) 12 (305)

Camber

Camber is defined as the maximum deviation of the
heater’s centerline from straight. FIREROD camber
within allowable tolerances is verified via passage
through a cylindrical gauge of specified length and
diameter. Normally, slight camber does not present
a problem since the heater will flex enough to fit into
a straight, close-fit hole.

Camber Measurement

Camber

Camber

Allowable Camber Versus Length

0.200

0.180

0.160

0.140

0.120

0.100

0.080

0.060

0.040

Max. Allowable Camber (in.)

0.020

0.000

0

Max. camber = 0.020 in. x (length in feet)2 or 0.005 in., whichever is greater.

5

10

15

Heater Length (in.)

20

25

30

35

40

13

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Applications and Technical Data (Continued)

Electrical Data

The table below will assist you in selecting the correct
FIREROD heater for your application, according
to available voltage, amperage and wattage.

Dia.

Please note, some combinations of minimum and
maximum wattages are not available on the same heater
diameter. If your application exceeds the limitations
shown, contact your Watlow representative.

1

/4 in. (6 mm)

Nominal
No-Heat

FIREROD
Diameter

in.

1

/8 240 3.1 — 8 5 360 720 — — —

1

/4 240

3

/8 240 6.7 65 35 25 800 1600 — — —

1

/2 240 9.7 40 25 20 1160 2320 — — —

5

/8 480 23.0 35 20 15 2760 5520 11,000

3

/4 480 23.0 30 15 10

7

1

Volts
Max.

480 23.0 — 15 10

Ampere

①

Max.

4.4

(25 mm)

2

Number Of Circuits

1 in.

100 55 40 525 1050 — — —

⑥

Diameter

in. 1-phase 3-phase

3

/4 3 1

1 5 2

Heated Length

Min. Watts @ 120V

③

1

/4 in. (6 mm)

Nominal
No-Heat

Heater Length Max. Watts

1

/2 in.

1

(38 mm)

2 in.

(50 mm)

120V

1-phase

2760

2760

4

4

a Determined by the current carrying capacity of internal parts and

lead wire. Alternate material may be available.

2 For 1/4 in. (6 mm) units with thermocouple maximum amperage

is 3.1A.

3 Determined by the limitation of space for resistance winding.

For minimum wattage of 240VAC multiply value by four.

4 Higher wattages are available using more than one set of power

12 in. (305 mm)

240V

1-phase

480V

1-phase

240V

3-phase

5 5

5520 11,000 9550 19,100

5520 11,000

9550

4

leads. Multiply the wattage from the table by the applicable factor.

5 Contact your Watlow representative for data.
6 On 3/4 in. (19 mm) diameter units, either three single-phase circuits

or one three-phase delta or wye circuit is available. On 1 in. (25 mm)
diameter units, either five single-phase or two three-phase delta
circuits are available.

7 A minimum charge per line item applies.

480V

3-phase

19,100

4

14

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Maximum Allowable Watt Density

The following four charts detail maximum allowable watt
densities for applications that use metal, steam, air or gas
heating. Please review the charts and applicable data to
determine the correct watt density for your application.

Correction Factors

These graphs depict FIRERODs used in steel parts,
therefore, for stainless steel, aluminum or brass, refer
to applicable correction factors:

1. For stainless steel, enter the graph with a fit

0.0015 in. (0.04 mm) larger than actual fit.

2. For aluminum and brass, enter the graph with a
temperature 100°F (38°C) above actual temperature.

0.100

0.090

0.080

0.070

0.060

0.050

0.040

Maximum Allowable Watt Density—Heating Metals

Heating Metals

The Maximum Watt Density— Heating Metals chart will
display the maximum hole fit or recommended watt
density of the heater. Enter the chart with either known
variable, part-fit-in-hole dimension or W/in2. Then, find the
application temperature by reading up or over on
the chart.

If the fit of the heater in the hole dimension is not known,
it can be easily determined. Subtract the minimum
diameter of the FIREROD (nominal diameter minus
tolerance) from the maximum hole diameter. For example,
the hole fit is 0.006 in. (0.15 mm) for a hole diameter of

0.500 in. (13 mm) minus a heater diameter of 0.496 in.
(12.6 mm) ±0.002 in. (0.05 mm). For FIREROD heaters in
square holes or grooves, contact your Watlow
representative for the fit in hole dimension.

Hole

Fit

Cartridge Heater

0.030

0.020

0.010

0.009

Fit in Hole—in.

0.008

0.007

0.006

0.005

0.004

0.003

0.002

0.001
10

200°F (93°C)

400°F (204°C)

1000°F (538°C)

1400°F (760°C)

30 40 50 60 7080100 200 300 400 500 600 800 1000

20

Watt Density—W/in

1200°F (649°C)

2

600°F (316°C)

800°F (427°C)

Fit in hole = maximum hole I.D. minus
minimum heater O.D.

WATLOW

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15

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Maximum Allowable Watt Density (Continued)

Watt Density vs. Ambient Air Temperature

The Watt Density vs. Ambient Air Temperature graph
shows the maximum allowable watt density when one
FIREROD is operated in air or similar gas.

For FIRERODs grouped in a single row, with no less than
one diameter between elements, multiply value from the
graph by 0.95. When a reflector is placed behind the
heaters, multiply the maximum allowable watt density
value from the graph by 0.85.

Sheath Temperature in Ambient Air

The Sheath Temperature in Ambient Air graph indicates
the watt density required to bring a pre-oxidized
FIREROD to a given sheath temperature when
operated in 70°F (21°C) ambient air.

At 44 W/in
1450°F (784°C). At this temperature, a one-year life is
expected if cycling is not too frequent.

Higher temperatures result in reduced heater life.

2

(6.8 W/cm2), the sheath temperature is

1600

1400

1200

1000

800

600

Ambient Temperature—°F

400

200

2000

1500

1000

Maximum Allowable Watt

Density vs. Ambient Air

10 20 30 40 50 60

Watt Density—W/in

FIREROD

Sheath Temperature When

Operated in 70°F Ambient Air

2

Not Pre-oxidized

Pre-oxidized

Watt Density in Moving Air

The Watt Density in Moving Air graph shows the
maximum allowable watt density of a FIREROD in
moving air.

The air movement is expressed in feet per minute (FPM).
If the air flow is known in cubic feet per minute (CFM),
divide the CFM by the net-free area around the heater
(ft2). The net-free area is the total area of the enclosure
minus the area occupied by the heater.

16

500

FIREROD Sheath Temperature—°F

10 20 30 40 50 60

Watt Density—W/in

Maximum Allowable

Watt Density in Moving Air

4500

Entering Air
Up To 200°F

4000

3500

3000

2500

2000

1500

FIREROD–Parallel To Air Flow

1000

Air Velocity Past Heater—FPM

500

20 40 60 80 100 120

Watt Density—W/in

FIREROD–Perpendicular To Air Flow

2

2

WATLOW

140

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Lead and Diameter Information

Standard Lead Specifications

Heater

Diameter

in. (mm)

1

/8 (3) 300 24 0.044 - 0.058 24 solid 0.036 - 0.044

1

/4 (6) 300 22 0.066 - 0.078 22 0.050 - 0.058

3

/8 (10) 300 22 0.076 - 0.088 20 0.056 - 0.064

1

/2 (13) 300 18 0.089 - 0.101 20 0.074 - 0.084

5

/8 (16) 600 18 0.108 - 0.124 18 0.097 - 0.113

3

/4 (19) 600 18 0.108 - 0.124 14 0.097 - 0.113

Max.

Voltage

1 (25)1 600 18 0.095 - 0.109 14 0.087 - 0.101 N/A N/A

Lead length tolerances:
1 to 36 in. (25 to 914 mm) = -

1

/2 in. (13 mm), +11/2 in. (38 mm)
> 36 to 72 in. (914 to 1829 mm) = -1, +3 in. (-25 + 76 mm) 1
Stainless steel hose and braid tolerances: same as lead wire.
Units constructed with 480V require MGT or PTFE leads. If connecting

heaters in series above 300V, MGT leads are also required.

Standard

Lead Gauge

Fiberglass

Size Tolerance

Fiberglass

Standard

Lead Gauge

PTFE

Size

Tolerance

PTFE

Stainless Steel

Ratings: GGS, 300V, 482°F (250°C)

MGT, 600V, 842°F (450°C)
PTFE, 600V, 392°F (200°C)
Silicone rubber, 600V, 302°F (150°C)

1 A minimum charge per line item applies.

Hose

I.D.

1

/8

5

/32

7

/32

9

/32

7

/16

7

/16

Stainless Steel

Braid

I.D.

1

/8

1

/8

3

/16

1

/4

3

/8

3

/8

Additional Lead Specifications

Lead Gauge

Nickel Ampacity

N.C.C. Ampacity

26 2.5 4.2 6.0
24 stranded 3.1 5.2 7.5
24 solid 3.1 5.2 7.5
22 4.4 7.2 10.5
20 N/A N/A 14.0
18 7.6 12.6 18.0
16 9.7 16.1 23.0
14 12.5 21.0 30.0
12 16.8 28.0 40.0
10 23.0 38.5 55.0

SPC/NPC

WATLOW

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17

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Lead Adapter (LA)

Options

Patented LA Modification Method

The lead adapter (LA) modification process is a powerful
tool for providing a wide range of finished heater
configurations very quickly. The LA process allows the
base FIREROD heater to be modified into a multitude
of configurations. The base FIREROD heater can be
selected to meet customers’ individual needs. The base
heater can then be customized by adding various finishing
options like lead length, lead protection, flanges, locating
rings and right-angle constructions.

Right Angle

Swaged-in Flexible Leads

No-Heat Extensions

PTFE Seal and Leads

Silicone Rubber Seal and Leads

Flange

Locating Ring

Threaded Fitting

Stainless Steel Braid

Stainless Steel Hose

18

Right Angle
Stainless
Steel Hose

Right Angle
Stainless
Steel Braid

WATLOW

®

Cartridge/Insertion Heaters

™

FIREROD Cartridge Heaters

Lead Adapter (LA)

Options

Two- or Five-Day Lead Times

Watlow’s FAST TRACK program allows made-to-order FIREROD cartridge heaters to be shipped in two or five days. You
can design a FIREROD to meet your unique applications. You can choose the size, voltage, wattage, termination
options and your preferred lead time. To take advantage of this program contact your Watlow representative.

Options

Swaged-in leads

PTFE seal and leads

Right angle leads

Stainless steel hose

Right angle hose

Stainless steel braid

Right angle braid

Straight hose with PTFE seal and leads

Right angle hose with PTFE seal and leads

Straight braid with PTFE seal and leads

Right angle braid with PTFE seal and leads

Right angle PTFE seal and leads

Ground lead

FS flange

FM flange

FL flange

Single stainless steel fitting

Additional lead end no-heat length

Note: Maximum heater length is 24 inches.

1

/4 Inch

3

/8 Inch

1

/2 Inch

5

/8 Inch

3 3 3 3 3

3 3 3 3
3 3 3 3 3
3 3 3 3 3

3 3 3 3
3 3 3 3 3

3 3 3 3

3 3 3 3

3 3 3 3

3 3 3 3

3 3 3 3

3 3 3 3
3 3 3 3 3
3 3 3
3 3 3 3 3

3 3
3 3 3 3 3
3 3 3 3 3

3

/4 Inch

WATLOW

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19

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

LA

Termination Options

LA Swaged-in Flexible Leads

Min. No-Heat

LA swaged-in flexible leads are used in applications
where a high degree of flexing exists or the leads must
be bent sharply adjacent to the heater without exposing
or breaking the conductor. The stranded wire leads
are connected internally and exit through the lead end.
The overall length of the heater is extended by

1

/4 in. (6 mm). To order, specify length adder code E

bringing the total lead end no-heat to 1/2 in. (13 mm).
This LA option is not available on 1/8 in. (3 mm) diameter

FIRERODs. On 1/8 in. (3 mm) diameter FIRERODs, leads
are connected externally using a solid conductor lead
wire. If stranded wire is desired on 1/8 in. (3 mm) diameter
units, contact your Watlow representative.

1

/

in.

2

(13 mm)

LA PTFE Seal and Leads

Min. No-Heat

The LA PTFE seal and leads protect the heater against
moisture/contamination from lubricating oil, cleaning
solvents, plastic material or fumes and organic tapes.
This seal is effective to 392°F (200°C) under continuous
operation.

Please note when ordering this option, that a minimum
no-heat section is required to allow for construction.
Additional no-heat may be required to keep the seal
below effective temperatures. The minimum lead end
no-heat required is 1 in. (25 mm). The LA cap adds

3

/4 in. (19 mm) to the overall length of the heater. To

order, specify option code T.

1 in.

(25 mm)

LA Silicone Rubber Seal and Leads

No-Heat Extensions

Right Angle (Swaged-in) Leads

No-Heat

No-Heat

Length

Length

Swaged-in Leads

No-heat extensions are recommended in applications
where leads may be exposed to excessive heat and
require a cooler lead end. They are also used when heat
is not required along the entire length of the FIREROD.

No-heat extensions are available for most LA options in
diameters of 3/8, 1/2, 5/8 and 3/4 in. (10, 13, 16 and 19
mm). These extensions are designed to provide a total
no-heat length of 1, 11/2, 2 or 21/2 in. (25, 38, 51 or 65
mm) at the lead end of FIRERODs only. Contact your
Watlow representative for available LA options.

Min. No-Heat

1 in.

(25 mm)

The LA silicone rubber seal and leads protect the heater
against moisture and contamination from lubricating oil,
cleaning solvents, plastic material, fumes and organic
tapes. This seal is effective to 302°F (150°C) under
continuous operation.

Please note when ordering this option, that a minimum
no-heat section is required to allow for construction.
Additional no-heat may be required to keep the seal
below effective temperatures. The minimum lead end
no-heat required is 1 in. (25 mm). The LA cap adds

3

/4 in. (19 mm) to the overall length. To order, specify

option code P.

20

WATLOW

®

Cartridge/Insertion Heaters

Min. No-Heat

Min. No-Heat

Min. No-Heat

1 in.

(25 mm)

Min. No-Heat

Min. No-Heat

Min. No-Heat

1 in.

(25 mm)

Min. No-Heat

Min. No-Heat

Min. No-Heat

1 in.

(25 mm)

FIREROD Cartridge Heaters

LA

Termination Options

(Continued)

LA Straight Stainless Steel Hose LA Straight Stainless Steel Braid

Min. No-Heat

An LA straight stainless steel hose provides the best
protection against abrasion from sharp edges. It also
offers ease of handling and wiring in abrasive
environments. Unless specified a 12 in. (305 mm)
hose is supplied. Leads are 2 in. (51 mm) longer
than the hose but, longer leads are available.

The minimum lead end no-heat required is 3/4 in.
(19 mm). This option adds 1/2 in. (13 mm) to the overall
length. To order, specify option code H.

LA Straight Stainless Steel Hose with
PTFE Leads and Seal

Min. No-Heat

The LA straight stainless steel braid is designed to protect
leads from abrasion against sharp edges. It is the most
flexible Watlow protective lead arrangement.

Unless specified, a 12 in. (305 mm) braid is supplied.
Leads are 2 in. (51 mm) longer than the braid, but longer
leads are available.

The minimum lead end no-heat required is 3/4 in.
(19 mm). This option adds 1/2 in. (13 mm) to the overall
length. To order, specify option code C.

LA Straight Stainless Steel Braid with
PTFE Leads and Seal

Min. No-Heat

Min. No-Heat

An LA straight stainless steel hose with PTFE leads and
seal is the ultimate combination for providing abrasion
protection and a moisture resistant seal. Unless specified,
a standard 12 in. (305 mm) hose is supplied. Leads are
2 in. (51 mm) longer than the hose, but longer leads are
available. This seal is effective up to 392°F (200°C) under
continuous operation.

The minimum lead end no-heat required is 1 in. (25 mm).
This option adds 3/4 in. (19 mm) to the overall length. To
order, specify option code G.

The LA straight stainless steel braid with PTFE leads and
seal is Watlow’s most flexible lead protection with
a moisture resistant seal. Unless specified, a 12 in.
(305 mm) braid is supplied. Leads are 2 in. (51 mm)
longer than the braid, but longer leads are available.
This seal is effective up to 392°F (200°C) under
continuous operation.

The minimum lead end no-heat required is 1 in. (25 mm).
This option adds 3/4 in. (19 mm) to the overall length. To
order, specify option code F.

WATLOW

®

21

Cartridge/Insertion Heaters

Min. No-Heat

Min. No-Heat

FIREROD Cartridge Heaters

LA

Right Angle Options

LA Right Angle Leads

Min. No-Heat

LA right angle leads are used in applications with a high
degree of flexing and when space limitations are critical.
Stranded lead wires are connected internally (swaged-in)
and exit at a 90 degree angle at the end of the heater.

To order, specify option code R.

Dia.
In. (mm)

Minimum No-Heat Required

1

/4

13

/16 (21) 3/4 (19) 13/16 (21) 13/16 (21) 13/16 (21)

3

/8

in. (mm)

1

/2

5

/8

3

/4

To order right angle leads with PTFE leads and seals,
specify option code B.

LA Right Angle Stainless Steel Hose

LA Right Angle Stainless Steel Hose with
PTFE Leads and Seal

Min. No-Heat

An LA right angle stainless steel hose with PTFE leads
and a seal is the ultimate combination for providing
abrasion protection and a moisture resistant seal with
wiring convenience. Unless specified, a 12 in. (305 mm)
hose is supplied. Leads are 2 in. (51 mm) longer than the
hose but longer leads are available. This seal is effective
to 392°F (200°C) under continuous operation.

The minimum lead end no-heat required is 11/2 in.
(38 mm). This option adds 11/4 in. (32 mm) to overall
length on stock units.

To order, specify option code M.
Note: This option is not available on 1/4 in. (6 mm)

diameter.

1½ in.

(38 mm)

Min. No-Heat

1 in.

(25 mm)

An LA right angle stainless steel hose is provided for
wiring convenience. Like the LA straight stainless steel
hose, it protects leads from abrasion against sharp edges.
Unless specified, a 12 in. (305 mm) hose is supplied.
Leads are 2 in. (51 mm) longer than the hose, but longer
leads are available.

Adder length in. (mm)3/4 (19)3/4 (19)3/4 (19)7/8 (22)

Min. no-heat in. (mm) 1 (25) 1 (25) 1 (25) 11/8 (29)

Diameter

3

/8

1

5

/2

/8

3

/4

To order specify option code W.
Note: This option is not available on 1/4 in. (6 mm)

diameter.

22

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

LA

Right Angle Options (Continued)

Mounting Options

LA Right Angle Stainless Steel Braid

Min. No-Heat

An LA right angle stainless steel braid is provided for
wiring convenience. It protects leads from abrasion
against sharp edges.

Unless specified, a 12 in. (305 mm) braid is supplied.
Leads are 2 in. (51 mm) longer than the braid, but longer
leads are available.

Diameter

Adder length in. (mm)3/4 (19)3/4 (19)3/4 (19)7/8 (22)

Min. no-heat in. (mm) 1 (25) 1 (25) 1 (25)

3

1

/8

To order, specify option code Y.
Note: This option is not available on 1/4 in. (6 mm)

diameter.

1 in.

(25 mm)

/2

5

/8

3

1

/8 (3)

/4

LA Right Angle Stainless Steel Braid with
PTFE Leads and Seal

LA Stainless Steel Threaded Fittings

Standard Fitting Location

Optional Fitting Location

Fitting overlaps the unheated section and is silver soldered to
the sheath.

Threaded fittings allow fast, water-tight installation of
the heater into a threaded hole. These fittings are 304
stainless steel, other stainless steel alloys are available
upon request. Double threaded fittings are also available.

Please see page 33 for threaded fitting specifications.
Provide the location of the fittings if no-heat extension

option is requested. Specify the location for option B.

Standard Fitting

Lead Location
Arrangement Dimension A
in. (mm)

Crimped Leads
Swaged-in Leads
STR SS Hose
STR SS Braid
PTFE Seal & Leads
Silicone Seal & Leads

A

B

①

1

/4 (6)

bd

5

/16

(8)

c

1

/2

(13)

1

/2 (13)

7

/8 (22)

7

/8 (22)

Min. No-Heat

1½ in.

(38 mm)

The LA right angle stainless steel braid with PTFE leads
and seal is Watlow’s most flexible lead protection with
a moisture resistant PTFE seal and wiring convenience.
Unless specified, a 12 in. (305 mm) braid is supplied.
Leads are 2 in. (51 mm) longer than the braid, but longer
leads are available. This seal is effective up to 392°F
(200°C) under continuous operation.

The minimum lead end no-heat required is 11/2 in.
(38 mm). This option adds 11/4 in. (32 mm) to the
overall length on stock units.

To order, specify option code A.
Note: This option is not available on 1/4 in. (6 mm)

diameter.

WATLOW

®

a The location of the threaded fitting from the thread end of the fitting

to the lead end of the heater.

All optional fitting locations are available only with LA no-heat

extensions. Contact your Watlow representative for details.

b On 1/4 in. diameter FIREROD only “A” dimension is 7/16 in. (11.1 mm).
c On 1/4 in. diameter FIREROD only “A” dimension is 5/8 in. (15.9 mm).
4 On 5/8 in. and 3/4 in. the fitting is located at 7/8 in. from the lead end

using a 3/4 in. no-heat extension. In order to locate at 5/16 in., the
fitting must be epoxied.

23

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

LA

Mounting Options

Flanges Locating Ring

⁄ in. (1.6 mm)

(nominal)

CD

H

0.14 in. (3.6 mm)

Stainless steel flanges are a convenient mounting method
to position a heater within an application. The flange is
staked on and located 1/4 in. (6 mm) from the lead end.
The flange can be located up to 21/4 in. (57 mm) from the
lead end if it is over a no-heat section. Use this option in
combination with most LA configurations.

To order, specify flange, size and locations.

Flange Specifications

FIREROD in. (mm)
Diameter Flange
in. Size D C H

1

/4, 3/8, 1/2 FS 1 (25) 3/4 (19) 0.144 (4)

1/4, 3/8, 1/2

5

/8, 3/4

5

/8, 3/4 FL 2 (51) 11/2 (38) 0.201 (5)

FM 11/2 (38) 11/8 (29) 0.156 (4)

A stainless steel locating ring can be used as a retaining
collar to position a FIREROD if mounting requirements are
not critical.

For LA, specify the location if the no-heat extension
option is requested. On FIRERODs with crimped on leads
without the LA option, the locating ring will be located on
the last

1

/4 in. (6 mm).

To order, specify locating ring.

Locating Ring Specifications

Diameter

Ring O.D.
in. (mm)

1

/4

1

/2 (13) 5/8 (16) 3/4 (19) 7/8 (22) 1 (25)

3

/8

1

/2

5

/8

3

/4

24

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

LA

Mineral Insulated (MI) Leads

Mineral Insulation

Nickel Conductor

Transition

PTFE Leads

"Metal to
Metal Seal"

304 SS Sheath

MI leads handle both high temperatures and
contamination, and resist other problems including
abrasion and excessive vibration. The metal seal and
swaged-in formable MI cable leads can handle
temperatures up to 1500°F (815°C). The lead end
seal resists moisture and other forms of contamination,
including gases, oils, plastic drool, solvents and water.

This LA option is also available as a manufactured
item. Specify MI leads and seal, as well as volts, watts,
cable length, lead length and type. Unless specified,
6 in. (152 mm) of MI cable and 12 in. (305 mm) of PTFE
leads will be supplied. To order, specify option code J.

Note: A minimum charge per line item applies.

Benefits

• Increases heater life

• Minimizes down time

• Resists moisture contamination

• Allows a cartridge heater to be used where it was not
previously possible

• Resists abrasion and vibration

• Forms and bends to fit the contours of wiring raceways

• Protects against high temperatures without additional
insulation

Typical Applications

• Vacuum forming

• Plastic molding

• Medical device manufacturing

• Food handling equipment

• Zinc die-casting

Technical Data

Max. temp. of cable: 1500°F (815°C)
Max. temp. of cable to lead transition: 300°F (149°C)

(where flexible leads attach to cable)

Cable sheath material: 304 SS
Conductor material: nickel
Max. voltage: 240V

Lead Types

PTFE 392°F (200°C) – T

Heater Max. Conductor Cable Transition Cable Length Max.
Diameter Current Diameter Diameter Diameter Min. Max. Min. Voltage Length
in. Amperes in. in. in. in. Bend Radius in. Adder

3

/8 7.0 0.044 0.108 0.230 6 72 0.225 240 G (3/8)

1

/2 7.0 0.044 0.108 0.230 6 72 0.225 240 K (9/16)

5

/8 9.7 0.062 0.138 0.250 6 72 0.280 240 L (5/8)

3

/4 9.7 0.062 0.138 0.250 6 72 0.280 240 L (5/8)

This information pertains to standard FIREROD heaters.

WATLOW

®

25

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

LA Options

Minimum Length Adders Per Diameter Per Option Option
Option in. (mm) Code

Heater Diameter

Swaged-in leads E 1/4 (6) E 1/4 (6) E 1/4 (6) E 1/4 (6) E 1/4 (6) None
Right angle leads K 9/16 (14) J 1/2 (13) K 9/16 (14) K 9/16 (14) K 9/16 (14) R
PTFE seal and leads — — N 3/4 (19) N 3/4 (19) N 3/4 (19) N 3/4 (19) T
Right angle PTFE seal and leads — — N 3/4 (19) N 3/4 (19) N 3/4 (19) N 3/4 (19) B
Silicone seal and leads — — N 3/4 (19) N 3/4 (19) N 3/4 (19) N 3/4 (19) P
Straight hose J 1/2 (13) J 1/2 (13) J 1/2 (13) J 1/2 (13) J 1/2 (13) H
Right angle hose — — N
Straight hose with PTFE
Straight braid J 1/2 (13) J 1/2 (13) J 1/2 (13) J 1/2 (13) J 1/2 (13) C
Right angle braid — — N 3/4 (19) N 3/4 (19) N 3/4 (19) R 7/8 (22) Y
Right angle braid with PTFE seal and leads — — 1E 11/4 (32) 1E 11/4 (32) 1E 11/4 (32) 1E 11/4 (32) A
Straight braid with PTFE seal and leads — — N 3/4 (19) N 3/4 (19) N 3/4 (19) N 3/4 (19) F
Right angle hose with PTFE seal and leads — — 1E 11/4 (32) 1E 11/4 (32) 1E 11/4 (32) 1E 11/4 (32) M

seal and leads — — N 3/4 (19) N 3/4 (19) N 3/4 (19) N 3/4 (19) G

1

/4 (6) 3/8 (9.5) 1/2 (13) 5/8 (15.9) 3/4 (19)

3

/4 (19) N 3/4 (19) N 3/4 (19) R 7/8 (22.2) W

LA options are available for all FIRERODs, except the

1

/8 in. diameter size. To order any of these options,
please build the order number by specifying the Watlow
part number, length adder code, option code and lead
length.

Ordering Example: The order number
J12A89-N72W74 indicates an order for a 12 in.

(305 mm) FIREROD with 72 in. (1830 mm) right angle
stainless steel hose and 74 in. (1880 mm) leads. The
overall heater length equals 123/4 in. (324 mm).

Note: No-heat extensions are available for most LA
options in diameters of 3/8, 1/2, 5/8 and 3/4 in. Contact
your Watlow representative for available LA options.

To order any of these dimensions, please specify the
applicable length adder code shown.

Modifying Basic FIRERODs Using the
LA Process for Swaged-in Leads

Watlow:

• Shortens conductor pins

• Welds lead wires to pins

• Places an LA cap over the lead end of the heater

• Reduces the diameter of the LA cap over the lead
end of the base unit to produce a rugged integrated
heater assembly

Notes:

• Other LA construction options use a similar modification

process

• Maximum temperature of LA cap is 1000°F (538°C)

Lead Type Codes

Type Maximum Temperature Option Code

GGS 482°F (250°C) None

MGT 842°F (450°C) H

PTFE 392°F (200°C) T

Note: Available for LA fiberglass leads.

No-Heat Length Adder Codes

No-Heat Option

in. (mm)

3

11/4 (32) 1E

13/4 (44) 1N

21/4 (56) 2E

/4 (19) N

Length Adder Code

Length Tolerance for Stock Heaters With LA Options

Conductor Pins

Base Stock Heater

Welded Connection

Base Stock Heater and Cap Assembly

Base Heater Length ±

whichever is greater

Finished Heater Assembly

Note: Base stock heater tolerance + LA cap tolerance = total tolerance for assembly

3

/32 in. or ± 2%

Lead Wires

LA Cap
Swaged-in
Leads

Lead Wires

Finished LA Cap Length
and Tolerance 0.250
+ 0.063

- 0.000

26

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Non-Lead Adapter (LA)

Modification Coding

Watlow offers heaters in various diameters, lengths and
volt-wattage combinations that are ready for shipping.
Basic modifications can be made and heaters are shipped
the same day. Modifications include flanges, threaded
fittings, locating rings, ceramic beads and crimped on
leads. Following is a list of all available non-LA mounting
and pin option codes.

Crimped-on Leads

Mounting Option Codes

BA - Small flange FS (available on 1/4, 3/8 and 1/2 in.)
BB - Medium flange FM (available on

1

/4, 3/8, 1/2, 5/8 and

3/4 in.)
BC - Large flange FL (available on
BD - Locating ring (available on

5

/8 and 3/4 in.)

1

/4, 3/8, 1/2, 5/8 and

3/4 in.)
BG - Single stainless steel fitting
BH - Double stainless steel fitting
BY - Stainless steel reversed

Pin Option Codes

AA - Short pins 3/8 in. (10 mm)
AB - Medium pins
AC - Long pins 1

AD - Stagger pins

AE - Ceramic beads
AF - Ceramic beads
AG - Ceramic beads 1 in. (25 mm)
AH - Ceramic beads 1
AJ - Ceramic beads 1

5

/8 in. (16 mm)

3

/4 in. (45 mm)

1

/2 in. (13 mm)

3

/4 in. (19 mm)

1

/4 in. (32 mm)

1

/2 in. (38 mm)

Ceramic Beads

Locating Ring

Threaded Fitting

WATLOW

®

27

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Made-to-Order

Straight Options

Swaged-in Flexible Leads

1 in. (25 mm) Min. No-Heat

¼ in. (6 mm)

No-Heat

12 in. (305 mm)

Standard

Swaged-in flexible leads are used in applications where
a high degree of flexing exists or leads must be bent
sharply adjacent to the heater without exposing or
breaking the conductor. Stranded wire leads are
connected internally and exit through the lead end.

Lead wire type is high temperature fiberglass. The
maximum temperature of the standard fiberglass end
piece is 842°F (450°C). Unless specified, 12 in. (305 mm)
leads are supplied.

The minimum lead end for no-heat is 1 in. (25 mm) min.
or 12 percent of overall heater length. Additional no-heat
may be required to keep the end piece and leads below
the maximum operating temperatures.

PTFE Seal and Leads

1 in. (25 mm)
Min. No-Heat

Straight Stainless Steel Hose

1¼ in. (32 mm)
Min. No-Heat

¼ in. (6 mm)
No-Heat

A straight stainless steel hose provides the best
protection against abrasion from sharp edges. It
also offers ease of handling and wiring in abrasive
environments.

Unless specified, a 12 in. (305 mm) hose is supplied.
Leads are 2 in. (51 mm) longer than the hose.

Option adds 1/4 in. (6 mm) to overall length of heater.
Note: This option is available with PTFE leads and seal.

Minimum no-heats are longer. Contact your Watlow
representative for details.

Straight Stainless Steel Braid

1¼ in. (32 mm)
Min. No-Heat

¼ in. (6 mm)
No-Heat

¼

in. (6 mm) No-Heat

A PTFE seal and leads protect the heater against
moisture and contamination from cleaning solvents,
plastic material, fumes and organic tapes. This seal is
effective up to 392°F (200°C) under continuous operation.

The PTFE seal and leads have a minimum lead end
unheated section of 1 in. (25 mm). Additional no-heat may
be required to keep the seal below its maximum operating
temperature.

28

A straight stainless braid is designed to protect leads
from abrasion against sharp edges and is Watlow’s most
flexible protective lead arrangement.

Unless specified, a 12 in. (305 mm) braid is supplied.
Leads are 2 in. (51 mm) longer than the braid.

This option adds 1/4 in. (6 mm) to overall length of heater.
Note: This option is available with PTFE leads and seal.

Minimum no-heats are longer. Contact your Watlow
representative for details.

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Made-to-Order

Right Angle Options

Right Angle Leads

Adder Length

Min. No-Heat

¼ in. (6 mm)
No-Heat

Right angle leads are used in applications with a high
degree of flexing and when space limitations are critical.
Standard lead wires are connected internally (swaged-in)
and exit at a 90° angle at the end of the heater.

Diameter

Adder length in. (mm)1/4 (6)1/4 (6)5/16 (8)7/16 (11)7/16 (11)

Min. no-heat in. (mm) 11/4 (32) 11/4 (32)

1

/4

3

/8

1

/2

15/16 (33)

5

/8

17/16 (37) 17/16 (37)

3

/4

Note: This option is available with PTFE leads and seal.

Minimum no-heats are longer. Contact your Watlow
representative for details.

Right Angle Stainless Steel Hose

Adder Length

Min. No-Heat

Right Angle Stainless Steel Braid

Adder Length

Min. No-Heat

¼ in. (6 mm)
No-Heat

A right angle stainless steel braid is provided for wiring
convenience. It protects leads from abrasion against
sharp edges.

Unless specified, a 12 in. (305 mm) hose is supplied.
Leads are 2 in. (51 mm) longer than the hose.

Diameter

Adder length in. (mm)5/16 (8)3/8 (10)9/16 (14)11/16 (17)13/16 (21)

Min. no-heat in. (mm)

1

15/16 (33) 13/8 (35) 19/16 (40) 111/16 (43) 113/16 (46)

Note: This option is available with PTFE leads and seal.
Minimum no-heats are longer. Contact your Watlow
representative for details.

3

/4

1

/8

/2

5

/8

3

/4

¼ in. (6 mm)
No-Heat

A right angle stainless steel hose is provided for wiring
convenience. It protects leads from abrasion against
sharp edges.

Unless specified, a 12 in. (305 mm) hose is supplied.
Leads are 2 in. (51 mm) longer than the hose.

Diameter

Adder length in. (mm)5/16 (8)3/8 (10)9/16 (14)11/16 (17)13/16 (21)

Min. no-heat in. (mm)

1

15/16 (33) 13/8 (35) 19/16 (40) 111/16 (43) 113/16 (46)

3

/4

1

/8

/2

5

/8

3

/4

Note: This option is available with PTFE leads and seal.

Minimum no-heats are longer. Contact your Watlow
representative for details.

WATLOW

®

29

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Made-to-Order

Termination Options

Silicone Rubber Seal and Leads

Min. No-Heat

Made-to-order silicone rubber seal and leads protect
the heater against moisture and contamination from
lubricating oil, cleaning solvents, plastic material, fumes
and organic tapes. This seal is effective up to 302°F
(150°C) under continuous operation.

Silicone rubber seal and leads for made-to-order units
greater than 10 in. (250 mm) long comprise a minimum
no-heat section of approximately 12 percent of the
overall length. Longer no-heat sections are available
if required.

1 in.

(25 mm)

Epoxy Seal

Min. No-Heat

Epoxy seals help protect the heater against
moisture and contamination from lubricating oil, cleaning
solvents, plastic material, fumes and organic tapes.
These seals are effective up to 250°F (121°C) under
continuous operation.

Epoxy seals can be ordered only on units greater than

1

/8 in. (3 mm) in diameter with crimped on leads. The
minimum no-heat section at the lead end is 1 in. (25 mm).
Longer no-heat sections are available upon request.

To order, specify epoxy seal.

1 in.

(25 mm)

Post Terminals

¾ in.

(19 mm)

5⁄8 in.

½ in.

(15.9 mm)

(13 mm)

Post terminals provide a quick, secure connection
with ring or fork connectors or bus bars. Threaded
6-32 studs are soldered to the solid power pins.
Nuts and washers are provided.

Post terminals are available on FIREROD heaters of

5

/8, 3/4 and 1 in. (16, 19 and 25 mm) diameter. On 1 in.

(25 mm) diameters, pins are straight. To order, specify

post terminals.

UL® Listed Plugs

UL® listed plugs are a safe, convenient installation
method, especially when frequent connection or
disconnection is required. These plugs have a nylon
dead front, a molded-in cord grip and straight or
Twist-Lock® blades with or without ground.

Use UL® listed plugs with a stainless steel hose, conduit,
braid or lead wires with sleeving. To order, specify

UL® listed plugs.

Ceramic Bead Insulation

Ground Lead

Ground leads are a safety feature to protect both workers
and equipment. This configuration is not available on all
options. Contact your Watlow representative for additional
information. To order, specify ground lead.

30

Ceramic bead insulation protects the leads from high
ambient temperatures above 842°F (450°C).

The beads fit over solid conductors that extend to reach
a cooler area where flexible wires can be attached.

This option is not available on 1/8 in. (3 mm) diameter
leads. The maximum available length on FIRERODs is
12 in. (305 mm). To order, specify ceramic beads and
length, and additional lead length.

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Made-to-Order

Options

Passivation

During the manufacturing and handling of stainless steel,
particles of iron or tool steel may embed in the sheath. If
they are not removed, particles may corrode and produce
rust spots. In critical sheath contact applications for the
medical industry, passivation will remove free iron from
the sheath. To order, specify 316L stainless steel

sheath and passivation.
Note: A minimum charge per line item applies.

Thermocouple Types

ASTM Conductor Characteristics Temperature Range
Code

J Iron Constantan
(Magnetic) (Non-Magnetic) 0 to 1400 (-20 to 760)

(White) (Red)

K Chromel® Alumel
(Non-Magnetic) (Magnetic) 0 to 2300 (-20 to 1260)

(Yellow) (Red)

For other ISA types, contact your Watlow representative.

Positive Negative

Style A

Style B

1

in.

/2

(13 mm)

No-Heat

Style C

°F (°C)

®

Individually Controlled Heat Zones

Individually controlled heat zones offer the flexibility to
control temperature by zones, along the length of the
FIREROD heater. This is an advantage for heating
requirements of certain applications, such as seal bars.
This internal construction can be ordered on 5/8, 3/4 and
1 in. (16, 19 and 25 mm) diameter FIREROD heaters.
To order, specify individually controlled heat zones
and wattage and length per zone.

Note: A minimum charge per line item applies.

Internal Thermocouple

Style A internal thermocouples can be used to
evaluate heat transfer efficiency of an application. This
measurement can help to cut energy costs and increase
heater life. The ungrounded junction is located in the
heater core to monitor the internal temperature of
the heater.

The Style B internal thermocouple provides a good
approximation of part temperature and is located
anywhere along the length of the heater. Due to variations
in production, this style may be grounded or ungrounded.

This junction is located adjacent to the inside heater
sheath in the center of the heated section unless
otherwise specified. A 1/2 in. (13 mm) unheated section
is required.

A Style C internal thermocouple is useful in applications
where material flows past the end of the heater, as
in plastic molding. This grounded junction is embedded in
a special end disc. Unless requested, the disc end is
not mechanically sealed.

To order, specify internal thermocouple, Style A, B
or C and thermocouple ASTM Type J or K.

If not specified, 12 in. (305 mm) thermocouple leads
are supplied.

Availability

All styles are available on all diameters with the exception

1

of

/8 in. (3.2 mm) diameter, which is available only with
Style C, and 1 in. (25 mm) which is available only with
Style A and B.

WATLOW

®

31

WATLOW

®

Cartridge/Insertion Heaters

FIREROD Cartridge Heaters

Made-to-Order

Options

Distributed Wattage Centerless Grinding

Centerless grinding can be used to furnish precision
diameters to permit closer heater-to-part fit allowing

1

in. (6 mm)

/4

No-Heat

Heated
Length

1

in. (6 mm)

/4

No-Heat

Distributed wattage varies the watt density along
the length of the heater. This construction technique
compensates for heat losses along the edges of heated
parts and is ideal for seal bar applications.

To order, specify distributed wattage and give the
length and wattage for each section.

Note: A minimum charge per line item applies.

Dual Voltage

When the FIREROD requires the flexibility of operating on
two voltages, dual voltage internal construction should be
used. Dual voltage is not compatible for all lead options.
Contact your Watlow representative for availability. To
order, specify dual voltage and voltage requirements.

Note: A minimum charge per line item applies.

higher watt densities to be used.
For centerless ground heaters, the heater must have

PTFE seal and leads (maximum 12 in. (305 mm) lead
length) or crimped on leads. Longer lead lengths are
available, but require an external connection. The
length of a FIREROD available for centerless grinding
depends on the construction. Please contact your
Watlow representative for assistance. To order, specify

centerless grinding.

FIREROD Actual
Diameter Precision Diameter
in. in.

1

A minimum charge per line item applies.

1

/4 0.241 ± 0.0005
3/8 0.363 ± 0.0005
1/2 0.488 ± 0.0005
5/8 0.613 ± 0.0005
3/4 0.738 ± 0.0005
1 1 0.984 ± 0.0005

Bolt Heaters

The high performance FIREROD can be upgraded with a
conduit box and wooden handle.

When inserted into a hollow bolt, this heater lengthens
the bolt by heat expansion allowing the nut to be further
wrench-tightened. The FIREROD bolt is then de-energized
and removed. Upon cooling, the bolt contracts to a
tight fit.

Performance Capabilities

• Part temperatures up to 1000°F (540°C)

• Maximum watt density up to 100 W/in2 (15.5 W/cm2)

FIREROD Bolt Specifications

Diameter ±0.005 in.
Maximum Volts
Maximum Amperes

120 Maximum Watts
240 Maximum Watts

1 PH 480
3 PH Available

Note: Minimum charge per line item applies.

0.496
240

9.7

1,160
2,320

—
—

0.621
480
23

2,760
5,520

11,000—22,000

0.746
480
46

5,520
11,000

YES

0.996
480
46

5,520
11,000

22,000

YES

5 in. (127 mm)
No-Heat

Wooden Handle

Nickel-Chromium
Resistance Wire

Magnesium
Oxide Insulation

4 in. (101 mm) Conduit Box
with Post Terminals

1 in. (25 mm) No-Heat

Alloy 800
Sheath

32

WATLOW

®

Cartridge/Insertion Heaters

0.140" (3.6 mm)

FIREROD Cartridge Heaters

Made-to-Order

Mounting Options

Threaded Fittings

Lead End Flush With
Hex Standard Location

0.250 in.

Min. No-Heat

Optional Fitting
Location

Optional Fitting

Location

Threaded fittings allow fast, water-tight heater installation
into a threaded hole. Standard fittings are 304 stainless
steel and welded to the heater sheath. Other materials
are available upon request. Double threaded fittings are
also available.

Unless specified, the fitting hex is located flush with the
lead end.

Threaded Fittings Specifications

Heater

Diameter

in.

1

/4

3

/8

1

/2

5

/8

3

/4

1 1

Pipe Thread

Size (NPTF)

in. (mm)

1

/8 (3)

1

/4 (6)

3

/8 (10)

1

/2 (13)

3

/4 (19) 1 (25) 113/16 (46)

(25) 1 (25) 1

Single Thread
Fitting Length

in. (mm)

1

/2 (13)

5

/8 (16) 15/16 (49)

3

/4 (19) 1

7

/8 (22) 113/16 (46)

Double Thread

Fitting Length

in. (mm)

7

/8 (22)

3

/8 (35)

1

/2 (38)

Flanges

⁄ in. (1.6 mm)

(nominal)

¼ in. (6 mm)
Standard Location

Optional Location

C

D

H

Stainless steel flanges are a convenient mounting
method and can be used to position a heater within
an application. The standard location is
from the lead end. However, a specific location may
be requested in any location along the no-heat section.
Unless specified, flanges are staked to the sheath.

To order, specify flange size and location.

Flange Specifications

FIREROD
Diameter

in.

1

/8, 1/4, 3/8, 1/2 FS 1 (25)

1

/4, 3/8, 1/2,

5

/8, 3/4

5

/8, 3/4, 1 FL 2 (51) 11/2 (38) 0.201

Flange

Size

D

in. (mm)Cin. (mm)

FM 11/2 (38) 11/8 (28) 0.156

1

/4 in. (6 mm)

3

/4 (19) 0.144

H

in.

Locating Rings

0.140 in. (3.6 mm)

Optional Location

Flush With Lead End
Standard Location

A stainless steel locating ring can be used as a retaining
collar to position a FIREROD heater if mounting
requirements are not critical. Standard locating rings are
staked to the heater sheath.

To order, specify locating ring and location.

Locating Ring Specifications

Diameter - in.

Ring O.D.
in. (mm)

1

/4

1

/2 (13) 5/8 (16) 3/4 (19) 7/8 (22) 1 (25)

3

/8

1

/2

5

/8

3

/4

33

Cartridge/Insertion Heaters

Extended Capabilities For
Custom Cartridge Heaters

Special cartridge heaters can be engineered and designed
to meet the most difficult applications and the highest
quality standards. From nuclear power plants to open
heart surgeries, Watlow cartridge heaters with extended
capabilities are exceeding customer expectations. For
more than 80 years, emphasis on sound engineering and
quality control has established Watlow as a preferred
supplier for many high-performance heating requirements.
For large opportunities, a solution for you can be
engineered to accommodate:

• Custom diameters

• High watt density applications

• Long heater lengths

• Low current leakage constructions

• Special testing and inspection

• Non-destructive testing: x-ray, helium leak tests and
start up verification

• Integrated thermostats

• Value added integration of the Watlow heater into a
sub-assembly

• Complete documentation packages: approval
drawings, material traceability, inspection traceability
and other compliance documents.

xtEndEd

E

apability

C

High Performance Cartridge Heaters

Watlow has developed a wide range of heaters and assemblies
to meet requirements for the most demanding applications.
Watlow can engineer and manufacture heaters with low leakage
constructions, integrated temperature controls or limits and
unique customer hardware and connectors.

34

10 ft

(3 m)

Nuclear Pressurizer Heaters

Watlow has provided specialized heaters to the nuclear industry
for more than 40 years. Watlow pressurizer heaters are highly
reliable and manufactured to meet the exacting standards of the
nuclear industry.

WATLOW

®

Cartridge/Insertion Heaters

Heated

Extended Capabilities For
FIREROD Cartridge Heaters

Made-to-Order

xtEndEd

E

apability

C

Termination Options

Low Electrical Leakage

This construction technique minimizes current leakage
of the heating element. It is especially useful in critical
medical applications where low set point ground fault
interrupts are used.

Low electrical leakage is available on 3/8, 1/2, 5/8 and

3

/4 in. (10, 13, 16 and 19 mm) diameter FIREROD

heaters.
To order, specify low electrical leakage.

SJO Cord

Min. No-Heat

SJO cord is used in low temperature applications where
lead wires require protection against moisture or when
UL® listed plugs are needed. This cord is limited to
140°F (60°C) under continuous operation.

FIREROD heaters greater than 10 in. (250 mm) have a
minimum no-heat section of approximately 12 percent
+ 1/4 in. (6 mm) of the overall length.

To order, specify either two conductor or three
conductor as well as overall length.

1

1

/4 in.

(32 mm)

Terminal Box

Options

Bent FIREROD

Bend Radius

1

in.

/4

(6 mm)

In applications where leads must exit at an angle,
a bend can be made in the unheated section only.
Heated sections may be on either side of the bend.
It is recommended that the heater be bent at the
Watlow factory.

A 304 stainless steel sheath is used on bent FIREROD
heaters. If the sheath temperature exceeds 1000°F
(540°C), contact your Watlow representative.

See dimensions noted on the chart or contact your
Watlow representative if application needs exceed
limitations shown.

FIREROD Min. Required Bend
Diameter No-Heat Length Radius
in. in. (mm) in. (mm)

1

/4 21/4 (56)

3

/8 23/8 (60)

1

/2 27/8 (72)

5

/8 35/16 (83) 1 (25)

3

/4 313/16 (98) 11/4 (32)

1

in.

/4

(6 mm)

1 in.
min.

(25 mm)

e

t

a

e

h

n

U

d

1

/2 (13)

1

/2 (13)

3

/4 (19)

4 in.
(100 mm)

1

in.

/2

1

(

mm)

38

①The no-heat
section is the
same as units
with threaded
fittings.

①

*

A 4 in. (100 mm) NEMA 1 octagonal terminal box is
mounted on a flange or a threaded fitting. Boxes have

1

/2 in. (13 mm) conduit knockouts for electrical connection.

Hazardous location (NEMA 4 and NEMA 7) terminal boxes
are also available. Contact your Watlow representative for
details. Terminal boxes are available on 1/2 in. (13 mm)
through 1 in. (25 mm) diameter FIREROD heaters.
To order, specify terminal box and NEMA type.

WATLOW

®

Mounting Options

LA Brass Threaded Fittings

Standard Fitting Location

Optional Fitting Location

Fitting overlaps the unheated section and is silver soldered to
the sheath.

Threaded fittings allow fast, water-tight installation of the
heater into a threaded hole. These fittings are brass, other
alloys are available upon request. Double threaded fittings
are also available.

Please see page 33 for threaded fitting specifications.
Provide the location of the fittings if no-heat extension

option is requested. Specify the location for option B.

A

B

35

Cartridge/Insertion Heaters

Extended Capabilities For

®

High-Temperature (HT) FIREROD
Heaters

The Watlow HT FIREROD heater is especially designed
for high temperature platen applications up to 1600°F
(871°C). The HT FIREROD heater utilizes the same
industry leading design principles used on all Watlow
FIREROD products. Advancing the FIREROD heater
enables it to withstand application temperatures up to
400°F (204°C) higher than standard cartridge heaters.

HT FIREROD design features, which are important in high
temperature applications, include:

• A specially constructed end seal that is virtually airtight
to reduce the effects of resistance wire oxidation

• A high-temperature sheath that is treated to improve
its emissivity for better heat transfer

Performance Capabilities

• Platen temperatures up to 1600°F (871°C)

• Maximum watt density up to 100 W/in2 (15.5 W/cm2)

• Maximum voltage up to 277VAC ground

• Length tolerance of +0, -4 percent standard diameters;
+0, -8 percent for special diameter

Made-to-Order Availability

Nominal Actual
Diameter Diameter Max.
in. in. Amperes

1

0.621 ± 0.004 23

0.746 ± 0.004 46
1 0.960 ± 0.004 46

0.996 ± 0.006 46

Contact your Watlow representative for special diameter requests.

/2 0.496 ± 0.004 10

5

/8 0.580 ± 0.004 23

3

/4 0.710 ± 0.004 46

xtEndEd

E

apability

C

High
Temperature
Seal*

Fiberglass Insulated
Crimped-on Leads

Insulation
Boots

* First 2 in. (51 mm) at lead end must be kept below 1000°F (538°C).

Optional
Ceramic
Beads

Conductor
Pins

Nickel-chromium
Resistance Wire

MgO Insulation

Alloy 800 Sheath

3 in. (76 mm)
Min. No-Heat Section

Features and Benefits

High-temperature seal

• Reduces exposure to the atmosphere, which

minimizes oxidation of the winding wires resulting in
longer element life

Note: The first 2 in. (51 mm) must be outside of the
platen in free air and less than 1000°F (538°C).

Alloy 800 sheath

• Transfers heat more efficiently

High emissivity sheath

• Provides better heat transfer and longer life

36

Typical Applications

• Thermo plastic

• Super plastic forming of titanium aircraft parts

• Diffusion bonding to laminate and shape titanium

WATLOW

®

Cartridge/Insertion Heaters

Extended Capabilities For
High-Temperature (HT) FIREROD
Heaters

xtEndEd

E

apability

C

Applications and Technical Data

Options

• Thermocouples

• Independently controllable heat zones

• Distributed wattage

• Flanges

• Post terminals

• Conduit NEMA boxes

• Bent FIREROD

To consider the HT FIREROD for your application, use
the recommended Maximum Watt Density graph shown.

0.100

0.090

0.080

0.070

0.060

0.050

0.040

0.030

0.020

Fit in Hole (in.)

0.010

0.009

0.008

0.007

Maximum Allowable Watt Density -

Heating Metals

1600°F

1500°F

1400°F

1200°F

1300°F

WATLOW

0.006

0.005

®

30 40 50 60 70 80 90 100

Watt Density—W/in

2

37

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

1

/8

1

/4

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

①

12 inch GGS swaged-in leads, no additional options available.

Sheath Length

in. (mm) Volts Watts

1 (25.0) 24 20 104 (16) 0.02 (0.009) C1A-9600
1 (25.0) 24 25 130 (20) 0.02 (0.009) C1A-9601
1 (25.0) 24 30 157 (24) 0.02 (0.009) C1A-9602
1 (25.0) 48 20 104 (16) 0.02 (0.009) C1A-9603
1 (25.0) 48 40 208 (32) 0.02 (0.009) C1A-9604
1 (25.0) 50 50 260 (40) 0.02 (0.009) C1A-9605
11/4 (32.0) 120 25 87 (13) 0.02 (0.009) C1E14

1

1

/4 (32.0) 120 50 174 (18) 0.02 (0.009) C1E13

11/4 (32.0) 240 35 113 (27) 0.02 (0.009) C1E42
11/2 (38.0) 120 30 78 (12) 0.02 (0.009) C1J5
11/2 (38.0) 120 60 156 (24) 0.02 (0.009) C1J6
2 (51.0) 120 50 87 (13) 0.02 (0.009) C2A4
2 (51.0) 120 100 174 (27) 0.02 (0.009) C2A5
1 (25.0) 120 80 208 (32) 0.02 (0.009) E1A51
1 (25.0) 120 100 260 (40) 0.02 (0.009) E1A52
1 (25.0) 120 150 390 (60) 0.02 (0.009) E1A53
1 (25.0) 240 100 250 (39) 0.02 (0.009) E1A66
11/4 (32.0) 120 75 130 (20) 0.02 (0.009) E1E41
11/4 (32.0) 120 100 173 (27) 0.02 (0.009) E1E42
11/4 (32.0) 120 150 260 (40) 0.02 (0.009) E1E43
11/4 (32.0) 240 225 390 (60) 0.02 (0.009) E1E61
11/2 (38.0) 120 50 65 (10) 0.02 (0.009) E1J39
11/2 (38.0) 120 100 130 (20) 0.02 (0.009) E1J40
11/2 (38.0) 120 150 195 (30) 0.02 (0.009) E1J41
11/2 (38.0) 240 175 228 (35) 0.02 (0.009) E1J49
11/2 (38.0) 120 200 260 (40) 0.02 (0.009) E1J42
11/2 (38.0) 240 200 260 (40) 0.02 (0.009) E1J52
11/2 (38.0) 240 250 325 (50) 0.02 (0.009) E1J35
2 (51.0) 120 80 68 (11) 0.03 (0.014) E2A136
2 (51.0) 120 100 87 (13) 0.03 (0.014) E2A55
2 (51.0) 240 125 108 (17) 0.03 (0.014) E2A82
2 (51.0) 120 150 130 (20) 0.03 (0.014) E2A56
2 (51.0) 240 150 130 (20) 0.03 (0.014) E2A77
2 (51.0) 120 200 173 (27) 0.03 (0.014) E2A57
2 (51.0) 240 200 173 (27) 0.03 (0.014) E2A50
2 (51.0) 120 250 217 (33) 0.03 (0.014) E2A72
2 (51.0) 240 250 215 (33) 0.03 (0.014) E2A76
2 (51.0) 240 300 260 (40) 0.03 (0.014) E2A83
21/2 (64.0) 120 250 159 (25) 0.03 (0.014) E2J80
21/2 (64.0) 240 250 159 (25) 0.03 (0.014) E2J49
3 (76.0) 120 100 52 (8) 0.04 (0.018) E3A48
3 (76.0) 120 200 104 (16) 0.04 (0.018) E3A49
3 (76.0) 240 200 104 (16) 0.04 (0.018) E3A60
3 (76.0) 240 250 128 (20) 0.04 (0.018) E3A124
3 (76.0) 120 300 156 (24) 0.04 (0.018) E3A50
3 (76.0) 240 300 156 (24) 0.04 (0.018) E3A51
4 (102.0) 120 100 37 (6) 0.04 (0.018) E4A28
4 (102.0) 120 200 74 (11) 0.04 (0.018) E4A29
4 (102.0) 240 200 74 (11) 0.04 (0.018) E4A32
4 (102.0) 120 300 111 (17) 0.04 (0.018) E4A30
4 (102.0) 240 300 111 (17) 0.04 (0.018) E4A6

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

①

①

①

①

①

①

CONTINUED

• Next day shipment

38

WATLOW

®

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

1

/4

3

/8

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

41/2 (114.0) 120 200 64 (10) 0.05 (0.023) E4J30
5 (127.0) 240 350 101 (16) 0.05 (0.023) E5A45
5 (127.0) 120 400 113 (18) 0.05 (0.023) E5A57
5 (127.0) 240 400 113 (18) 0.05 (0.023) E5A34
6 (152.0) 240 400 94 (14) 0.06 (0.027) E6A46
8 (203.0) 240 800 136 (21) 0.08 (0.036) E8A76
1 (25.0) 120 55 95 (15) 0.03 (0.014) G1A71
1 (25.0) 120 100 172 (26) 0.03 (0.014) G1A29
1 (25.0) 120 150 259 (40) 0.03 (0.014) G1A38
1 (25.0) 240 200 344 (53) 0.03 (0.014) G1A83

1

1

/4 (32.0) 120 100 115 (18) 0.03 (0.014) G1E91

11/4 (32.0) 120 125 144 (22) 0.03 (0.014) G1E74
11/4 (32.0) 120 150 172 (27) 0.03 (0.014) G1E92
11/4 (32.0) 240 150 172 (27) 0.03 (0.014) G1E93
11/4 (32.0) 120 200 230 (35) 0.03 (0.014) G1E94
11/4 (32.0) 240 200 230 (35) 0.03 (0.014) G1E95
11/4 (32.0) 120 400 426 (66) 0.03 (0.014) G1E99
11/2 (38.0) 120 50 43 (7) 0.04 (0.018) G1J25
11/2 (38.0) 120 75 65 (10) 0.04 (0.018) G1J70
11/2 (38.0) 120 80 68 (11) 0.04 (0.018) G1J66
11/2 (38.0) 120 100 86 (13) 0.04 (0.018) G1J59
11/2 (38.0) 240 100 86 (13) 0.04 (0.018) G1J110
11/2 (38.0) 240 125 106 (16) 0.04 (0.018) G1J182
11/2 (38.0) 120 150 129 (20) 0.04 (0.018) G1J31
11/2 (38.0) 240 150 129 (20) 0.04 (0.018) G1J39
11/2 (38.0) 120 200 173 (27) 0.04 (0.018) G1J85
11/2 (38.0) 240 200 173 (27) 0.04 (0.018) G1J73
11/2 (38.0) 120 250 216 (33) 0.04 (0.018) G1J86
11/2 (38.0) 240 250 216 (33) 0.04 (0.018) G1J54
13/4 (45.0) 120 125 86 (13) 0.05 (0.023) G1N45
13/4 (45.0) 120 175 122 (19) 0.05 (0.023) G1N46
13/4 (45.0) 120 250 172 (27) 0.05 (0.023) G1N43
13/4 (45.0) 240 250 172 (27) 0.05 (0.023) G1N32
2 (51.0) 120 50 29 (5) 0.06 (0.027) G2A53
2 (51.0) 120 75 42 (7) 0.06 (0.027) G2A192
2 (51.0) 120 100 57 (9) 0.06 (0.027) G2A84
2 (51.0) 240 100 57 (9) 0.06 (0.027) G2A76
2 (51.0) 120 150 86 (13) 0.06 (0.027) G2A56
2 (51.0) 240 150 86 (13) 0.06 (0.027) G2A81
2 (51.0) 120 200 115 (18) 0.06 (0.027) G2A127
2 (51.0) 240 200 115 (18) 0.06 (0.027) G2A37
2 (51.0) 120 250 144 (22) 0.06 (0.027) G2A47
2 (51.0) 240 250 144 (22) 0.06 (0.027) G2A73
2 (51.0) 120 300 172 (27) 0.06 (0.027) G2A139
2 (51.0) 240 300 172 (27) 0.06 (0.027) G2A98
2 (51.0) 120 400 230 (36) 0.06 (0.027) G2A153
2 (51.0) 240 400 230 (36) 0.06 (0.027) G2A146
2 (51.0) 120 500 282 (44) 0.06 (0.027) G2A95
2 (51.0) 240 500 282 (44) 0.06 (0.027) G2A97
21/4 (57.0) 120 75 37 (6) 0.07 (0.032) G2E88
21/4 (57.0) 120 125 62 (10) 0.07 (0.032) G2E89

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

WATLOW

®

39

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

3

/8

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

21/4 (57.0) 240 125 62 (10) 0.07 (0.032) G2E138
21/4 (57.0) 240 150 73 (11) 0.07 (0.032) G2E68
21/4 (57.0) 120 175 86 (13) 0.07 (0.032) G2E90
21/4 (57.0) 120 250 123 (19) 0.07 (0.032) G2E2
21/4 (57.0) 240 250 123 (19) 0.07 (0.032) G2E78
21/4 (57.0) 120 300 148 (23) 0.07 (0.032) G2E108

1

/4 (57.0) 240 300 148 (23) 0.07 (0.032) G2E12

2

1

2

/4 (57.0) 120 350 173 (27) 0.07 (0.032) G2E91

21/4 (57.0) 240 350 173 (27) 0.07 (0.032) G2E75

1

/2 (64.0) 120 200 87 (13) 0.07 (0.032) G2J110

2

1

2

/2 (64.0) 240 200 87 (13) 0.07 (0.032) G2J81

21/2 (64.0) 120 250 108 (17) 0.07 (0.032) G2J46
21/2 (64.0) 240 250 108 (17) 0.07 (0.032) G2J80
21/2 (64.0) 120 300 130 (20) 0.07 (0.032) G2J118
21/2 (64.0) 240 300 130 (20) 0.07 (0.032) G2J119
21/2 (64.0) 120 400 174 (27) 0.07 (0.032) G2J26
21/2 (64.0) 240 400 174 (27) 0.07 (0.032) G2J146
21/2 (64.0) 120 500 216 (33) 0.07 (0.032) G2J109
21/2 (64.0) 240 500 216 (33) 0.07 (0.032) G2J52
3 (76.0) 120 100 34 (5) 0.08 (0.036) G3A55
3 (76.0) 240 100 34 (5) 0.08 (0.036) G3A137
3 (76.0) 120 150 52 (8) 0.08 (0.036) G3A121
3 (76.0) 120 200 69 (11) 0.08 (0.036) G3A61
3 (76.0) 240 200 69 (11) 0.08 (0.036) G3A39
3 (76.0) 120 250 86 (13) 0.08 (0.036) G3A52
3 (76.0) 240 250 86 (13) 0.08 (0.036) G3A54
3 (76.0) 120 300 104 (16) 0.08 (0.036) G3A73
3 (76.0) 240 300 104 (16) 0.08 (0.036) G3A92
3 (76.0) 120 400 138 (21) 0.08 (0.036) G3A44
3 (76.0) 240 400 138 (21) 0.08 (0.036) G3A65
3 (76.0) 120 500 173 (27) 0.08 (0.036) G3A119
3 (76.0) 240 500 173 (27) 0.08 (0.036) G3A120
3 (76.0) 240 600 208 (32) 0.08 (0.036) G3A133
31/2 (89.0) 120 250 72 (11) 0.09 (0.041) G3J77
31/2 (89.0) 240 250 72 (11) 0.09 (0.041) G3J65
31/2 (89.0) 120 300 87 (13) 0.09 (0.041) G3J87
31/2 (89.0) 240 300 87 (13) 0.09 (0.041) G3J68
31/2 (89.0) 120 500 144 (22) 0.09 (0.041) G3J22
31/2 (89.0) 240 500 144 (22) 0.09 (0.041) G3J63
4 (102.0) 120 125 31 (5) 0.09 (0.041) G4A54
4 (102.0) 240 125 31 (5) 0.09 (0.041) G4A163
4 (102.0) 120 150 37 (6) 0.09 (0.041) G4A78
4 (102.0) 120 175 43 (7) 0.09 (0.041) G4A191
4 (102.0) 120 250 62 (10) 0.09 (0.041) G4A40
4 (102.0) 240 250 62 (10) 0.09 (0.041) G4A87
4 (102.0) 120 300 74 (11) 0.09 (0.041) G4A94
4 (102.0) 240 300 74 (11) 0.09 (0.041) G4A95
4 (102.0) 120 400 99 (15) 0.09 (0.041) G4A48
4 (102.0) 240 400 99 (15) 0.09 (0.041) G4A44
4 (102.0) 240 450 109 (17) 0.09 (0.041) G4A64
4 (102.0) 120 500 123 (19) 0.09 (0.041) G4A96
4 (102.0) 240 500 123 (19) 0.09 (0.041) G4A92

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

40

WATLOW

®

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

3

/8

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

4 (102.0) 120 550 134 (21) 0.09 (0.041) G4A200
41/4 (108.0) 240 300 67 (10) 0.09 (0.041) G4E25
41/4 (108.0) 240 750 167 (26) 0.09 (0.041) G4E15
41/2 (114.0) 120 300 65 (10) 0.10 (0.045) G4J54
41/2 (114.0) 240 300 65 (10) 0.10 (0.045) G4J33
41/2 (114.0) 120 500 108 (17) 0.10 (0.045) G4J55
41/2 (114.0) 240 500 108 (17) 0.10 (0.045) G4J37
5 (127.0) 120 150 29 (4) 0.11 (0.050) G5A68
5 (127.0) 240 150 29 (4) 0.11 (0.050) G5A56
5 (127.0) 120 300 58 (9) 0.11 (0.050) G5A69
5 (127.0) 240 300 58 (9) 0.11 (0.050) G5A70
5 (127.0) 120 500 96 (15) 0.11 (0.050) G5A38
5 (127.0) 240 500 96 (15) 0.11 (0.050) G5A71
5 (127.0) 240 750 144 (22) 0.11 (0.050) G5A67
5 (127.0) 240 1000 192 (30) 0.11 (0.050) G5A115
51/4 (133.0) 240 200 45 (7) 0.12 (0.054) G5E16
51/2 (140.0) 240 600 104 (16) 0.12 (0.054) G5J36
51/2 (140.0) 240 1000 173 (27) 0.12 (0.054) G5J45
6 (152.0) 120 200 31 (5) 0.13 (0.059) G6A80
6 (152.0) 120 250 39 (6) 0.13 (0.059) G6A40
6 (152.0) 240 250 39 (6) 0.13 (0.059) G6A92
6 (152.0) 120 400 63 (10) 0.13 (0.059) G6A81
6 (152.0) 240 400 63 (10) 0.13 (0.059) G6A82
6 (152.0) 120 500 79 (12) 0.13 (0.059) G6A125
6 (152.0) 240 500 79 (12) 0.13 (0.059) G6A59
6 (152.0) 120 600 94 (15) 0.13 (0.059) G6A56
6 (152.0) 240 600 94 (15) 0.13 (0.059) G6A51
6 (152.0) 240 750 117 (18) 0.13 (0.059) G6A46
6 (152.0) 240 1000 157 (24) 0.13 (0.059) G6A83
61/2 (165.0) 240 600 86 (13) 0.14 (0.064) G6J23
61/2 (165.0) 240 1000 144 (22) 0.14 (0.064) G6J33
7 (178.0) 120 250 33 (5) 0.14 (0.064) G7A40
7 (178.0) 240 250 33 (5) 0.14 (0.064) G7A32
7 (178.0) 240 500 65 (10) 0.14 (0.064) G7A30
7 (178.0) 120 600 80 (12) 0.14 (0.064) G7A41
7 (178.0) 240 600 80 (12) 0.14 (0.064) G7A42
7 (178.0) 240 1000 133 (21) 0.14 (0.064) G7A43
71/2 (191.0) 240 600 74 (11) 0.15 (0.068) G7J27
71/2 (191.0) 240 1000 124 (19) 0.15 (0.068) G7J28
8 (203.0) 120 300 34 (5) 0.16 (0.073) G8A54
8 (203.0) 240 300 34 (5) 0.16 (0.073) G8A47
8 (203.0) 120 400 45 (7) 0.16 (0.073) G8A109
8 (203.0) 120 500 58 (9) 0.16 (0.073) G8A81
8 (203.0) 240 500 58 (9) 0.16 (0.073) G8A32
8 (203.0) 120 600 69 (11) 0.16 (0.073) G8A53
8 (203.0) 240 600 69 (11) 0.16 (0.073) G8A37
8 (203.0) 240 700 79 (12) 0.16 (0.073) G8A98
8 (203.0) 240 1000 115 (18) 0.16 (0.073) G8A45
9 (229.0) 240 1000 100 (16) 0.18 (0.082) G9A37
91/2 (241.0) 240 600 57 (9) 0.19 (0.086) G9J20
91/2 (241.0) 240 1000 96 (15) 0.19 (0.086) G9J12
10 (254.0) 120 400 36 (6) 0.19 (0.086) G10A48

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

WATLOW

®

41

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

3

/8

1

/2

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

10 (254.0) 120 600 54 (8) 0.19 (0.086) G10A35
10 (254.0) 240 600 54 (8) 0.19 (0.086) G10A31
10 (254.0) 240 1000 91 (14) 0.19 (0.086) G10A32
12 (305.0) 120 400 30 (5) 0.22 (0.100) G12A45
12 (305.0) 120 600 45 (7) 0.22 (0.100) G12A29
12 (305.0) 240 600 45 (7) 0.22 (0.100) G12A46
12 (305.0) 240 1000 75 (12) 0.22 (0.100) G12A47
1 (25.0) 120 50 65 (10) 0.06 (0.027) J1A30
1 (25.0) 120 150 193 (30) 0.06 (0.027) J1A31

1

1

/4 (32.0) 120 50 43 (7) 0.07 (0.032) J1E50

1

/4 (32.0) 120 125 107 (17) 0.07 (0.032) J1E51

1

1

1

/4 (32.0) 240 125 107 (17) 0.07 (0.032) J1E58

11/4 (32.0) 240 200 172 (27) 0.07 (0.032) J1E52
11/4 (32.0) 240 250 212 (33) 0.07 (0.032) J1E88
11/2 (38.0) 120 50 32 (3) 0.08 (0.036) J1J47
11/2 (38.0) 120 150 97 (15) 0.08 (0.036) J1J48
11/2 (38.0) 240 150 97 (15) 0.08 (0.036) J1J96

1

/2 (38.0) 120 200 128 (20) 0.08 (0.036) J1J59

1

1

1

/2 (38.0) 240 200 128 (20) 0.08 (0.036) J1J38
2 (51.0) 120 75 32 (5) 0.09 (0.041) J2A80
2 (51.0) 120 200 86 (13) 0.09 (0.041) J2A49
2 (51.0) 240 200 86 (13) 0.09 (0.041) J2A75
2 (51.0) 120 250 108 (17) 0.09 (0.041) J2A85
2 (51.0) 240 250 108 (17) 0.09 (0.041) J2A71
2 (51.0) 120 300 128 (20) 0.09 (0.041) J2A95
2 (51.0) 240 300 128 (20) 0.09 (0.041) J2A96
2 (51.0) 120 400 171 (27) 0.09 (0.041) J2A81
2 (51.0) 240 400 171 (27) 0.09 (0.041) J2A82
21/4 (57.0) 120 75 28 (4) 0.10 (0.045) J2E86
21/4 (57.0) 120 125 46 (7) 0.10 (0.045) J2E87
21/4 (57.0) 120 250 92 (14) 0.10 (0.045) J2E56
21/4 (57.0) 240 250 92 (14) 0.10 (0.045) J2E69
21/4 (57.0) 120 400 147 (22) 0.10 (0.045) J2E114
21/4 (57.0) 240 400 147 (22) 0.10 (0.045) J2E115
21/4 (57.0) 120 500 184 (29) 0.10 (0.045) J2E64
21/4 (57.0) 240 500 184 (29) 0.10 (0.045) J2E88
21/2 (64.0) 120 100 32 (5) 0.11 (0.050) J2J67

1

/2 (64.0) 240 100 32 (5) 0.11 (0.050) J2J57

2

1

2

/2 (64.0) 120 250 81 (13) 0.11 (0.050) J2J68
21/2 (64.0) 240 250 81 (13) 0.11 (0.050) J2J69
21/2 (64.0) 120 300 96 (15) 0.11 (0.050) J2J109
21/2 (64.0) 240 300 96 (15) 0.11 (0.050) J2J110
21/2 (64.0) 120 400 128 (20) 0.11 (0.050) J2J81
21/2 (64.0) 240 400 128 (20) 0.11 (0.050) J2J82
21/2 (64.0) 120 500 161 (24) 0.11 (0.050) J2J66
21/2 (64.0) 240 500 161 (24) 0.11 (0.050) J2J70
23/4 (70.0) 240 400 115 (18) 0.11 (0.050) J2N43
23/4 (70.0) 120 400 115 (18) 0.11 (0.050) J2N45
3 (76.0) 120 125 32 (5) 0.12 (0.054) J3A108
3 (76.0) 240 125 32 (5) 0.12 (0.054) J3A109
3 (76.0) 120 250 64 (10) 0.12 (0.054) J3A107
3 (76.0) 240 250 64 (10) 0.12 (0.054) J3A89
3 (76.0) 120 300 78 (12) 0.12 (0.054) J3A65

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

42

WATLOW

®

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

1

/2

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

3 (76.0) 120 350 89 (14) 0.12 (0.054) J3A173
3 (76.0) 240 300 78 (12) 0.12 (0.054) J3A73
3 (76.0) 120 400 104 (16) 0.12 (0.054) J3A132
3 (76.0) 240 400 104 (16) 0.12 (0.054) J3A29
3 (76.0) 120 500 129 (20) 0.12 (0.054) J3A110
3 (76.0) 240 500 129 (20) 0.12 (0.054) J3A111
3 (76.0) 120 600 154 (24) 0.12 (0.054) J3A51
3 (76.0) 240 600 154 (24) 0.12 (0.054) J3A127
3 (76.0) 120 750 193 (30) 0.12 (0.054) J3A137
3 (76.0) 240 750 193 (30) 0.12 (0.054) J3A112
3 (76.0) 120 1000 254 (39) 0.12 (0.054) J3A79
31/2 (89.0) 120 250 54 (8) 0.14 (0.064) J3J44
31/2 (89.0) 240 250 54 (8) 0.14 (0.064) J3J64
31/2 (89.0) 240 350 75 (12) 0.14 (0.064) J3J65
31/2 (89.0) 120 500 107 (17) 0.14 (0.064) J3J45
31/2 (89.0) 240 500 107 (17) 0.14 (0.064) J3J46
31/2 (89.0) 240 750 162 (25) 0.14 (0.064) J3J63
4 (102.0) 120 150 28 (4) 0.15 (0.068) J4A117
4 (102.0) 240 150 28 (4) 0.15 (0.068) J4A122
4 (102.0) 120 250 46 (7) 0.15 (0.068) J4A118
4 (102.0) 240 250 46 (7) 0.15 (0.068) J4A90
4 (102.0) 120 300 56 (9) 0.15 (0.068) J4A63
4 (102.0) 240 300 56 (9) 0.15 (0.068) J4A26
4 (102.0) 120 350 65 (10) 0.15 (0.068) J4A1
4 (102.0) 240 350 65 (10) 0.15 (0.068) J4A103
4 (102.0) 120 400 74 (11) 0.15 (0.068) J4A139
4 (102.0) 240 400 74 (11) 0.15 (0.068) J4A68
4 (102.0) 120 500 92 (14) 0.15 (0.068) J4A16
4 (102.0) 120 550 100 (16) 0.15 (0.068) J4A242
4 (102.0) 240 500 92 (14) 0.15 (0.068) J4A92
4 (102.0) 120 750 138 (21) 0.15 (0.068) J4A198
4 (102.0) 240 750 138 (21) 0.15 (0.068) J4A119
4 (102.0) 240 1000 184 (28) 0.15 (0.068) J4A73
41/2 (114.0) 120 500 80 (12) 0.17 (0.077) J4J69
41/2 (114.0) 240 500 80 (12) 0.17 (0.077) J4J57
41/2 (114.0) 120 750 120 (19) 0.17 (0.077) J4J70
41/2 (114.0) 240 750 120 (19) 0.17 (0.077) J4J32
5 (127.0) 120 200 29 (4) 0.19 (0.086) J5A85
5 (127.0) 240 200 29 (4) 0.19 (0.086) J5A74
5 (127.0) 120 350 50 (8) 0.19 (0.086) J5A86
5 (127.0) 240 350 50 (8) 0.19 (0.086) J5A63
5 (127.0) 120 400 58 (9) 0.19 (0.086) J5A98
5 (127.0) 240 400 58 (9) 0.19 (0.086) J5A46
5 (127.0) 120 500 72 (11) 0.19 (0.086) J5A52
5 (127.0) 240 500 72 (11) 0.19 (0.086) J5A45
5 (127.0) 120 750 108 (17) 0.19 (0.086) J5A121
5 (127.0) 240 750 108 (17) 0.19 (0.086) J5A72
5 (127.0) 240 1000 143 (22) 0.19 (0.086) J5A87
51/2 (140.0) 240 200 25 (4) 0.20 (0.091) J5J38
51/2 (140.0) 120 500 64 (10) 0.20 (0.091) J5J43
51/2 (140.0) 240 500 64 (10) 0.20 (0.091) J5J33
51/2 (140.0) 240 650 83 (13) 0.20 (0.091) J5J69

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

WATLOW

®

43

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

1

/2

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

51/2 (140.0) 120 750 97 (15) 0.20 (0.091) J5J44
51/2 (140.0) 240 750 97 (15) 0.20 (0.091) J5J45
53/4 (146.0) 120 700 86 (13) 0.20 (0.091) J5N6
53/4 (146.0) 240 700 86 (13) 0.20 (0.091) J5N8
6 (152.0) 120 250 29 (4) 0.21 (0.095) J6A114
6 (152.0) 240 250 29 (4) 0.21 (0.095) J6A171
6 (152.0) 240 300 35 (6) 0.21 (0.095) J6A66
6 (152.0) 240 350 41 (7) 0.21 (0.095) J6A119
6 (152.0) 120 500 59 (9) 0.21 (0.095) J6A115
6 (152.0) 240 500 59 (9) 0.21 (0.095) J6A94
6 (152.0) 120 750 88 (14) 0.21 (0.095) J6A99
6 (152.0) 240 750 88 (14) 0.21 (0.095) J6A90
6 (152.0) 120 1000 117 (18) 0.21 (0.095) J6A53
6 (152.0) 240 1000 117 (18) 0.21 (0.095) J6A36
61/2 (165.0) 240 500 54 (8) 0.23 (0.104) J6J45
61/2 (165.0) 240 1000 108 (17) 0.23 (0.104) J6J27
7 (178.0) 120 250 25 (4) 0.24 (0.109) J7A79
7 (178.0) 120 500 50 (8) 0.24 (0.109) J7A80
7 (178.0) 240 500 50 (8) 0.24 (0.109) J7A57
7 (178.0) 120 600 60 (9) 0.24 (0.109) J7A50
7 (178.0) 240 600 60 (9) 0.24 (0.109) J7A95
7 (178.0) 240 1000 99 (15) 0.24 (0.109) J7A81
71/2 (191.0) 240 500 46 (7) 0.26 (0.118) J7J25
71/2 (191.0) 240 1000 92 (14) 0.26 (0.118) J7J26
8 (203.0) 120 300 26 (4) 0.28 (0.127) J8A71
8 (203.0) 240 300 26 (4) 0.28 (0.127) J8A111
8 (203.0) 120 500 43 (7) 0.28 (0.127) J8A64
8 (203.0) 240 500 43 (7) 0.28 (0.127) J8A66
8 (203.0) 120 1000 86 (13) 0.28 (0.127) J8A84
8 (203.0) 240 1000 86 (13) 0.28 (0.127) J8A60
8 (203.0) 240 1500 129 (20) 0.28 (0.127) J8A100
8 (203.0) 240 2000 172 (27) 0.28 (0.127) J8A101
81/2 (216.0) 240 300 24 (4) 0.29 (0.132) J8J39
81/2 (216.0) 240 500 40 (6) 0.29 (0.132) J8J30
81/2 (216.0) 240 1000 80 (12) 0.29 (0.132) J8J28
9 (229.0) 240 500 38 (6) 0.30 (0.136) J9A35
9 (229.0) 240 1000 76 (12) 0.30 (0.136) J9A58
91/2 (241.0) 240 500 36 (6) 0.32 (0.145) J9J14
91/2 (241.0) 240 1000 72 (11) 0.32 (0.145) J9J12
10 (254.0) 120 500 34 (5) 0.33 (0.150) J10A61
10 (254.0) 240 500 34 (5) 0.33 (0.150) J10A62
10 (254.0) 120 1000 68 (11) 0.33 (0.150) J10A63
10 (254.0) 240 1000 68 (11) 0.33 (0.150) J10A42
10 (254.0) 240 1500 102 (16) 0.33 (0.150) J10A33
10 (254.0) 240 2000 136 (21) 0.33 (0.150) J10A64
11 (279.0) 240 1000 61 (9) 0.36 (0.163) J11A60
12 (305.0) 120 500 28 (4) 0.40 (0.181) J12A63
12 (305.0) 240 500 28 (4) 0.40 (0.181) J12A76
12 (305.0) 120 1000 56 (9) 0.40 (0.181) J12A40
12 (305.0) 240 1000 56 (9) 0.40 (0.181) J12A49
12 (305.0) 240 1500 84 (13) 0.40 (0.181) J12A37
12 (305.0) 240 2000 112 (17) 0.40 (0.181) J12A89
14 (356.0) 240 1000 48 (7) 0.48 (0.218) J14A41

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

44

WATLOW

®

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

1

/2

5

/8

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

14 (356.0) 240 2300 110 (17) 0.48 (0.218) J14A39
15 (381.0) 240 1500 66 (10) 0.50 (0.227) J15A19
16 (406.0) 240 1000 41 (7) 0.52 (0.236) J16A12
18 (457.0) 240 1500 55 (9) 0.57 (0.259) J18A19
18 (457.0) 240 1700 62 (9) 0.57 (0.259) J18A23
11/4 (32.0) 120 50 34 (5) 0.10 (0.045) L1E26
11/4 (32.0) 120 200 137 (21) 0.10 (0.045) L1E24
11/4 (32.0) 120 250 171 (27) 0.10 (0.045) L1E27
11/2 (38.0) 120 250 128 (20) 0.11 (0.050) L1J23
11/2 (38.0) 240 250 128 (20) 0.11 (0.050) L1J24
2 (51.0) 120 100 34 (5) 0.13 (0.059) L2A48
2 (51.0) 120 200 68 (11) 0.13 (0.059) L2A49
2 (51.0) 240 500 170 (26) 0.13 (0.059) L2A54
21/4 (57.0) 120 100 29 (4) 0.14 (0.064) L2E49
21/4 (57.0) 120 250 73 (11) 0.14 (0.064) L2E50
21/4 (57.0) 240 250 73 (11) 0.14 (0.064) L2E12
21/4 (57.0) 120 350 103 (16) 0.14 (0.064) L2E40
21/4 (57.0) 240 350 103 (16) 0.14 (0.064) L2E51
3 (76.0) 120 150 31 (5) 0.20 (0.091) L3A81
3 (76.0) 120 250 51 (8) 0.20 (0.091) L3A82
3 (76.0) 240 250 51 (8) 0.20 (0.091) L3A9
3 (76.0) 120 400 81 (13) 0.20 (0.091) L3A94
3 (76.0) 120 500 102 (16) 0.20 (0.091) L3A113
3 (76.0) 240 500 103 (16) 0.20 (0.091) L3A33
3 (76.0) 240 750 154 (24) 0.20 (0.091) L3A71
33/4 (95.0) 120 525 82 (13) 0.24 (0.109) L3N12
33/4 (95.0) 240 525 82 (13) 0.24 (0.109) L3N1
4 (102.0) 120 250 37 (6) 0.26 (0.118) L4A99
4 (102.0) 240 250 37 (6) 0.26 (0.118) L4A104
4 (102.0) 240 400 58 (9) 0.26 (0.118) L4A47
4 (102.0) 240 500 73 (11) 0.26 (0.118) L4A53
4 (102.0) 240 600 88 (14) 0.26 (0.118) L4A44
4 (102.0) 240 750 110 (17) 0.26 (0.118) L4A100
4 (102.0) 240 1000 146 (23) 0.26 (0.118) L4A71
5 (127.0) 120 250 28 (4) 0.29 (0.132) L5A76
5 (127.0) 240 250 28 (4) 0.29 (0.132) L5A107
5 (127.0) 240 500 57 (9) 0.29 (0.132) L5A24
5 (127.0) 240 750 86 (13) 0.29 (0.132) L5A31
5 (127.0) 240 1000 114 (18) 0.29 (0.132) L5A77
6 (152.0) 120 300 28 (4) 0.34 (0.154) L6A28
6 (152.0) 240 300 28 (4) 0.34 (0.154) L6A64
6 (152.0) 240 500 47 (7) 0.34 (0.154) L6A73
6 (152.0) 240 750 70 (11) 0.34 (0.154) L6A70
6 (152.0) 240 1000 93 (14) 0.34 (0.154) L6A71
6 (152.0) 120 1500 139 (22) 0.34 (0.154) L6A163
6 (152.0) 240 1500 140 (22) 0.34 (0.154) L6A94
61/2 (165.0) 120 500 43 (7) 0.38 (0.172) L6J43
61/2 (165.0) 240 500 43 (7) 0.38 (0.172) L6J55
7 (178.0) 120 500 39 (6) 0.40 (0.181) L7A42
7 (178.0) 240 500 39 (6) 0.40 (0.181) L7A15
7 (178.0) 240 1000 79 (12) 0.40 (0.181) L7A37
7 (178.0) 240 1500 118 (18) 0.40 (0.181) L7A12

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

WATLOW

®

45

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

5

/8

3

/4

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

8 (203.0) 120 500 34 (5) 0.47 (0.213) L8A96
8 (203.0) 240 500 34 (5) 0.47 (0.213) L8A46
8 (203.0) 240 850 58 (9) 0.47 (0.213) L8A115
8 (203.0) 240 1000 68 (10) 0.47 (0.213) L8A10
8 (203.0) 240 1500 102 (16) 0.47 (0.213) L8A37
8 (203.0) 240 2000 137 (21) 0.47 (0.213) L8A80
10 (254.0) 120 500 27 (4) 0.53 (0.240) L10A51
10 (254.0) 240 500 27 (4) 0.53 (0.240) L10A40
10 (254.0) 240 750 40 (6) 0.53 (0.240) L10A69
10 (254.0) 240 1000 54 (8) 0.53 (0.240) L10A52
10 (254.0) 480 1000 54 (8) 0.53 (0.240) L10A193
10 (254.0) 240 1500 81 (13) 0.53 (0.240) L10A8
10 (254.0) 240 2000 108 (17) 0.53 (0.240) L10A50
12 (305.0) 120 500 22 (3) 0.66 (0.300) L12A81
12 (305.0) 240 500 22 (3) 0.66 (0.300) L12A80
12 (305.0) 240 900 40 (6) 0.66 (0.300) L12A102
12 (305.0) 120 1000 45 (7) 0.66 (0.300) L12A82
12 (305.0) 240 1000 45 (7) 0.66 (0.300) L12A34
12 (305.0) 120 1500 66 (10) 0.66 (0.300) L12A147
12 (305.0) 240 1500 67 (10) 0.66 (0.300) L12A39
12 (305.0) 240 2000 89 (14) 0.66 (0.300) L12A63
14 (356.0) 240 3700 140 (22) 0.79 (0.358) L14A21
15 (381.0) 240 750 27 (4) 0.84 (0.381) L15A35
15 (381.0) 240 2400 84 (13) 0.84 (0.381) L15A20
15 (381.0) 480 2500 88 (14) 0.84 (0.381) L15A88
15 (381.0) 240 4000 141 (22) 0.84 (0.381) L15A41
16 (406.0) 240 2500 82 (13) 0.91 (0.412) L16A33
16 (406.0) 240 4500 148 (23) 0.91 (0.412) L16A40
18 (457.0) 240 1500 44 (7) 1.03 (0.467) L18A32
18 (457.0) 240 3000 87 (13) 1.03 (0.467) L18A34
18 (457.0) 240 4700 137 (21) 1.03 (0.467) L18A36
20 (508.0) 240 1500 40 (6) 1.25 (0.567) L20A19
20 (508.0) 240 3500 92 (14) 1.25 (0.567) L20A13
20 (508.0) 480 3500 92 (14) 1.25 (0.567) L20A96
20 (508.0) 240 4700 123 (19) 1.25 (0.567) L20A14
24 (610.0) 240 2000 44 (7) 1.47 (0.667) L24A19
24 (610.0) 240 4700 102 (15) 1.47 (0.667) L24A14
36 (914.0) 240 3000 43 (7) 2.30 (1.04) L36A8
21/4 (57.0) 120 200 49 (8) 0.19 (0.086) N2E8
3 (76.0) 120 250 43 (7) 0.24 (0.109) N3A11
3 (76.0) 240 500 85 (13) 0.24 (0.109) N3A12
4 (102.0) 120 250 31 (5) 0.31 (0.141) N4A16
4 (102.0) 240 500 61 (9) 0.31 (0.141) N4A17
4 (102.0) 240 1000 122 (19) 0.31 (0.141) N4A15
5 (127.0) 120 300 28 (4) 0.38 (0.172) N5A19
5 (127.0) 240 500 47 (7) 0.38 (0.172) N5A12
5 (127.0) 240 1000 95 (15) 0.38 (0.172) N5A20
6 (152.0) 120 500 39 (6) 0.44 (0.200) N6A19
6 (152.0) 240 500 39 (6) 0.44 (0.200) N6A20
6 (152.0) 240 1000 78 (12) 0.44 (0.200) N6A21
6 (152.0) 480 1000 78 (12) 0.44 (0.200) N6A225

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbs (kg) Part Number

CONTINUED

• Next day shipment

46

WATLOW

®

Cartridge/Insertion Heaters

RAPID SHIP

FIREROD Cartridge Heaters

Heater Part Numbers

Diameter

in.

3

/4

RAPID SHIP heaters are manufactured to standard specifications. 12 inch crimped on GGS Ieads
supplied unless otherwise specified.

Sheath Length

in. (mm) Volts Watts

6 (152.0) 240 1500 116 (18) 0.44 (0.200) N6A82
6 (152.0) 240 2000 155 (24) 0.44 (0.200) N6A22
7 (178.0) 120 500 33 (5) 0.51 (0.231) N7A15
7 (178.0) 240 500 33 (5) 0.51 (0.231) N7A1
7 (178.0) 240 1000 66 (10) 0.51 (0.231) N7A16
8 (203.0) 120 500 28 (4) 0.58 (0.263) N8A19
8 (203.0) 240 500 28 (4) 0.58 (0.263) N8A20
8 (203.0) 240 1000 57 (9) 0.58 (0.263) N8A21
8 (203.0) 240 2000 114 (17) 0.58 (0.263) N8A22
10 (254.0) 240 1000 45 (7) 0.72 (0.327) N10A15
10 (254.0) 240 2000 90 (14) 0.72 (0.327) N10A14
12 (305.0) 240 1000 37 (6) 0.84 (0.381) N12A15
12 (305.0) 240 2000 74 (11) 0.84 (0.381) N12A24
12 (305.0) 480 2000 74 (11) 0.84 (0.381) N12A198
12 (305.0) 240 4000 148 (23) 0.84 (0.381) N12A25
13 (330.0) 240 1000 34 (5) 0.93 (0.422) N13A26
14 (356.0) 240 1250 40 (6) 1.03 (0.467) N14A22
14 (356.0) 240 2500 79 (12) 1.03 (0.467) N14A20
14 (356.0) 240 4500 142 (22) 1.03 (0.467) N14A21
15 (381.0) 240 1500 44 (7) 1.09 (0.494) N15A26
16 (406.0) 240 1800 49 (8) 1.14 (0.517) N16A26
16 (406.0) 240 4700 129 (20) 1.14 (0.517) N16A18
18 (457.0) 240 2000 49 (8) 1.25 (0.567) N18A13
18 (457.0) 240 5000 122 (19) 1.25 (0.567) N18A15
20 (508.0) 240 1150 25 (4) 1.40 (0.635) N20A21
20 (508.0) 240 2250 49 (8) 1.40 (0.635) N20A22
20 (508.0) 240 5250 115 (18) 1.40 (0.635) N20A10
24 (610.0) 240 1375 25 (4) 1.80 (0.816) N24A24
24 (610.0) 240 2750 50 (8) 1.80 (0.816) N24A23
24 (610.0) 480 2750 50 (8) 1.80 (0.816) N24A78
24 (610.0) 240 5500 100 (16) 1.80 (0.816) N24A13
36 (914.0) 240 2500 30 (6) 2.50 (1.13) N36A4

Watt Density

2

W/in

(W/cm2)

Approx. Net Wt.

lbsw (kg) Part Number

• Next day shipment

WATLOW

®

47