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Series 260HL Heavy-Duty Threaded Well for
Application:
Standard length,
1
⁄4" bimetal thermometers.
#20-gage thermocouple elements. Unarmored
liquid-in-glass test thermometers. Other temperaturesensing elements having 0.252" maximum diameter.
Connection Size:
3
⁄4 and 1 NPT are standard. Other thread sizes are
available upon request.
Series 260HL—Lagging Extension Type
3/4
WRENCH
WRENCH
ALLOWANCE
ALLOWANCE ALLOWANCE
T
LAGGING
EXTENSION
1
THREAD
Materials:
Brass (ASTM B-16), Carbon Steel (C-1018), Stainless
Steel A.I.S.I. 304 & A.I.S.I. 316, Monel
available in special materials; prices on request.
Cap and Chain Options:
For Brass cap, add additional cost to price and suffix
“-CC-Brass” to the end of the model number when you
place your order. For 304SS cap, add additional cost to
price and add suffix “-CC” to the end of the model number.
U INSERTION LENGTH
Q DIA.
1
⁄4" Diameter Elements
®
Metric Models
Available!
Visit omega.com
5
/
8
DIA.
. Wells are also
1
/
2
NPSM *
P NPT
A STEM LENGTH
± 0.002
0.260 BORE
† NPSM internal pipe thread
will accept both NPT and
NPS male threads.
1
/
4
Dimensions: inches
To Order Visit omega.com/series_260hl for Pricing and Details
Ext Lag Stem Insert Shank
Thread Ext. Lgth Lgth Dia.
P Model Number T A U Q
3⁄4 NPT 3/4-260HL-U21/2- (*) 2 6 2
3/4-260HL-U41/2-(*) 3 9 4
3/4-260HL-U71/2- (*) 3 12 7
3/4-260HL-U101/2-(*) 3 15 10
3/4-260HL-U131/2-(*) 3 18 13
3/4-260HL -U191/2- (*) 3 24 19
1 NPT 1-260HL-U21/2- (*) 2 6 21⁄2 —
1-260HL-U41/2- (*) 3 9 4
1-260HL-U71/2-(*) 3 12 7
1-260HL-U101/2-(*) 3 15 10
1-260HL-U131/2-(*) 3 18 13
1-260HL-U191/2- (*) 3 24 19
Specify material type “304SS” for 304 Stainless Steel, “316SS” for 316 Stainless Steel, “CS” for Carbon Steel or
*
“BRASS” for brass. PFA coating available, visit omega.com.
Ordering Example: 3/4-260HL-U71/2-304SS, 304 stainless steel thermowell with
internal diameter, 3" Lagging Extension, 7
For Assistance in Choosing Head and Well Assemblies visit omega.com
1
⁄2" insertion length and a 12" stem length.
1
⁄2 —
1
⁄2
1
⁄2
1
⁄2
1
⁄2
1
⁄2
1
⁄2
1
⁄2
1
⁄2
1
⁄2
1
⁄2
3
⁄4 NPT external thread, 0.260"
7
⁄8
7
⁄8
7
⁄8
7
⁄8
7
⁄8
11
⁄16
11
⁄16
11
⁄16
11
⁄16
11
⁄16
Shown close to
actual size.
Visit omega.com
for PressureTemperature
Ratings.
Maximum Fluid Velocity—feet per second
Well Type
2
3
⁄4" - 260H Brass 305 (97.5) 93.8 (54.1) 33.9 17.1 10.5 7.0 5.0 3.7
Material
1
⁄2 41⁄2 71⁄2 101⁄2 131⁄2 161⁄2 191⁄2 221⁄2
and Carbon Steel 386 (175) 180 (97.2) 65.3 (58.3) 33.0 20.1 13.4 9.6 7.1
Insertion Length – “U”
Section on Velocity at omega.com.
3⁄4" - 260HL A.I.S.I. 304 & 316 440 (243) 197 (135) 71.2 36.0 22.0 14.7 0.5 7.8
See Introduction to Thermowells,
Monel 354 (195) 155 (108) 56.1 28.4 17.3 11.6 7.5 5.6
1"- 260H Brass 354 (161) 108 (89.5) 39.4 19.8 12.2 8.1 5.8 4.3
and Carbon Steel 448 (289) 209 (161) 75.7 38.4 23.3 15.5 11.1 8.2
1"- 260HL A.I.S.I. 304 & 316 490 (403) 228 (225) 82.5 41.8 25.5 17.1 12.2 9.1
Monel 410 (322) 179 (178) 65.1 33.0 20.1 13.5 8.7 6.5
Where single values appear in the velocity tables, these may be considered safe for water, steam, air or gas. In the
shorter insertion lengths, consideration is given to the velocity pressure effect of water flowing at higher velocities. The
values in parentheses, therefore, represent safe values for water flow, while the unbracketed values may be used for
steam, air, gas and similar density fluids.
B-21
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