Stearns 56 Series Catalog Page

56 Series

Mounting Face: NEMA 56C, 143TC and 145TC

BACK TO T ABLE OF CONTENTS

The 56,X00 Series have the following design features:

• Spring-Set Electrically Released

• Static Torque 1.5 through 25 lb-ft

• Adjustable Torque, down to 50% of rated
nameplate torque

• Manual Wear Adj ustment

• Airgap Adjust Gage

• Splined Hub

• IP 21, 23 & 54 (formerly referred to by Stearns
as NEMA type 1, 2 & 4 respectively)
IP 55, 56, & 57 (formerly referred to by Stearns
as NEMA Type 4X (BISSC Certified with epoxy
coating and stainless steel hardware on exterior,
or with a stainless steel enclosure)

• Universal mounting through 15 lb-ft. The
20 and 25 lb-ft are supplied with springs
for vertical modification.

Product Overview

56000 Series

Designed
performance in a compact lightweight package.

Construction:
Die cast aluminum endplate with
stamped steel housing

Available Enclosures:
IP 23, 54 & 55

Release Type:
External knob manual release with
or without automatic reset

Through Shaft Capability: Yes (IP 23 only)

for industrial applications requiring high

56200 Series

56700 Series

Units designed for industrial applications that fit between a
standard C-Face motor and gear reducer. Can also be used to
retrofit installed units without braking capability.

Construction: Die cast aluminum
endplate and housing

Available Enclosures:
IP 23, 54, 55 & 56

Release Type: External knob
release with automatic reset

C-face brake has output shaft

Specifications:

• Lead Wire Length: 24 inches

• Maximum Speed:
Horizontal 5000 rpm
Vertical 3600 rpm

• Coil Insulation: Standard Class B
Optional Class H
(56,800 Series Class H standard)

• Certified: CSA File LR-6254

• ABS Type Approval Certified

Designed for industrial applications requiring
the protection of a heavy duty cast iron
enclosure.

Construction:
Cast iron endplate and housing.

Available Enclosures: IP 56 & 57

Release Type:
External side lever release with
automatic reset

Through Shaft Capability: Yes

56500 Series

Same as 56000 Series with 182TC / 184TC mounting.
Construction:

Cast iron endplate with stamped
steel housing
(Direct mount to 182TC / 184TC)

Available Enclosures:
IP 23, 54 & 55

Release Type:
External knob manual release
with or without automatic reset

Through Shaft Capability: Yes (IP 23 only)

56900 Series

For use in severe environments found in process industries
such as food, pulp and paper mills and chemical plants.

Construction: Stainless steel
Release

Side lever with automatic reset
Available Enclosures: IP 56 & IP 57
Through Shaft Capability: with IP43

rating only

Type:

Also Available . . .

56100 Series

Full die cast aluminum endplate and

with internal release lever

housing

Available Enclosures:
IP 23, 56 & 57

56300 Series

Die cast aluminum endplate with stamped steel
housing and external maintained release, IP 21

56400 Series

Cast iron endplate with
stamped
external knob release

Available Enclosures:
IP 23 & 54

56600 Series

Cast iron endplate and housing with internal
release lever

Available Enclosures: IP 23, 56 & 57

steel housing and

10

Series 56,000; 56,100; 56,200; 56,300; 56,400;
56,500; 56,600; 56,700; and 56,900

Mounting Face: NEMA 56C, 143TC and 145TC

BACK TO T ABLE OF CONTENTS

Engineering Specifications

Maximum Solenoid Cycle Rate: 1
AC 36 cycles/min DC

10 cycles/min

1 Maximum solenoid cycle rate is based on ambient temperature of 72°F (22°C)

with 50% duty cycle.
Does not relate to brake cycle rate (see Thermal Capacity).

2 Thermal capacity rating is based on ambient temperature of 72°F (22°C),

stop time of one second or less, with no heat absorbed from motor. Refer to
Selection Procedure Section.

Series 56,000; 56,100; 56,300;
56,500; and 56,700

Nominal

Torque

10 (14) 2 K4 K4+ .014 (5.88)
15 (20) 2 K4+ M4+ .014 (5.88)
20 (27) 3 K4+ M4+ .020 (8.40)
25 (34) 3 M4+ P4+ .020 (8.40)

Number

Static

Friction

lb-ft

(Nm)

1.5-3

(2-4)
6 (8) 1 K4 K4+ .008 (3.36)

Discs

Coil Size Inertia (WK

of

AC DC

1 4 4+ .008 (3.36)

Thermal Capacity: 2
Horizontal 9 hp-sec/min (112 watts)

Vertical 6.5 hp-sec/min (80 watts)

Series 56,200; 56,400;
56,600; and 56,900

Nominal

2

Static

No. of

Torque

Friction

discs

lb-ft

(Nm)

10 (14) 2 K4 K4+ .014 (5.88)
15 (20) 2 K4+ M4+ .014 (5.88)
20 (27) 3 K4+ M4+ .020 (8.40)
25 (34) 3 M4+ P4+ .020 (8.40)

2

lb-ft

(kgm2 x 10-4)

)

3-6 (4-8) 2 4 4+ .014 (5.88)

Coil
Size

AC DC

Inertia (WK

2

lb-ft

(kgm2 x 10-4)

Current Ratings (amperes)

Solenoid

Coil Size*

4
4+
K4

K4+

M4

M4+
P4+

AC

Current

Inrush
Holding
Inrush
Holding
Inrush
Holding
Inrush
Holding
Inrush
Holding
Inrush
Holding
Inrush
Holding

3.6

4.3

4.6

3.0

4.6

1.1

1.8

2.1
.2

.3

–

–

2.5

.2

.3

2.5

.2

.4

1.7

.3

.6

2.5

.2

.4

–

–

2.2

2.3

1.5

2.3

.08

.2

–

–

1.3

.1

.2

1.2

.1

.2

.9

.2

.3

1.2

.1

.2

–

–

.08

1.1

.08

1.0

1.0

.7

.9

.06

–

–

.9

.07

.9

.08

.1

.6

.8

.21

.1

.9

.08

.1

–

–

4.1

3.8

4.9

4.1

2.1
.2

.3

–

.4
.4

–

.4

–

1.9

2.0

2.0

.08

–

1.1

.2

.08

1.0

.2

–

1.3

.2

–

Voltage: DCVoltage: 50 HzVoltage: 60 Hz

230115220400 95110230 24575200 380460115

1.5

2.8

3.6

13.3

.9

–

.1

.8

.1
.1

–

.3

12.0

.4

17.5

.4

20.5

.5

–

30.3

.5

30.3

.5

.1

4.7

.1

4.7

.1

7.5

.1

–

7.9

.1

11.3

.1

.05

3.7

.08

3.7

.08

5.5

.08

5.5

8.4

.08

.03

2.0

.04

2.0

.04

2.0

.04

–

–

2.0

.04

.1

3.0

.04

Motor Frame Adapters: Series 56,000 through 56,600

WARNING! Before selecting an adapter to mount a brake on a larger motor frame, the

torque and thermal capacity required by the application should be determined as shown in
the “Selection Procedure” section. A larger motor may indicate a requirement for greater
thermal capacity than the brake is designed for. The brake selection must be matched to
the motor and application requirements, before use of an adapter is considered.

To Adapt
to NEMA

Frame

Size

182TC
184TC
213TC
215TC
254TC
256TC

1

56,300 Series have NEMA 1 enclosure. For adapter dimensions, see Technical Data

AK Dim.

in.

(mm)

8.50

(215.90)

8.50

(215.90)

8.50

(215.90)

8.50

(215.90)

Reg.

No.

Brake

Enclosure

1

Brake

Torque

Adapter

Stock

Number

5-55-5041-001.5-15IP 23-9

5-55-5041-001.5-6IP 54-9

5-55-5043-0020 & 25IP 23-9

5-55-5043-0010-25IP 54-9

Additional

Shaft Length

Required

in.

(mm)

.94

(23.81)

.94

(23.81)

.94

(23.81)

.94

(23.81)

Brake set and release times in milliseconds,
when brake and motor are switched separately
(for T1/T2 definitions, see page 101):

Static

Torque lb-ft

Coil Size T1 T2

1.5 - 25 4, K4, K4+, M4+ 25 14

Ordering and Identification Information

The following example and tables provide information

2

for selecting the appropriate three-letter suffix when

)

ordering a Stearns Brake.
Example of a complete part number:

1-056-034-00-BFF Lead wire position

Series

Torque

230 Vac

Enclosure

5/8 bore and
3/16 x 3/32 keyway

Hub Selection

Character

A*

B
C
D

E

F*

K
L*
N*
O*

11/16

P*

1-1/16

R*

13/16

S *

15/16

Z

Minimum bore is .500. Maximum allowable bore is 1.25

(maximum shaft length not to exceed end of hub).
For through-shaft applications, .875 is maximum

* These bores are non-standard.

** Keyseats made to ANSI B17.1 Standard.

Standard AC
Voltage Ratings

Character Voltage Hz

B 115 60
D 110 50
E 200 60

F
H 220 50
L
M 415 50

N 575 60
O 110/220 50
P 115/208-230 60

208-230/460

Q
R 200/400 60

Modifications are available-

see SAB Modification Section

Dimensional Drawings are on the pages following.

(internal and external,
left and right) standard

Bore

Keyway**

(in.)

(in. x in.)

5/8

1/8 x 1/16

5/8

3/16 x 3/32

3/4

3/16 x 3/32

7/8

3/16 x 3/32

1-1/8

1/4 x 1/8

1-1/4

1/4 x 1/8

1/2

1/8 x 1/16

1

1/4 x 1/8

9/16

1/8 x 1/16

3/16 x 3/32

1/4 x 1/8

3/16 x 3/32

1/4 x 1/8

.460

pilot bore

230
1906050

460
3806050

190/3806050

Direct
Current

Char-

acter

T
U
V

W

X
Y
Z

Consult factory if
other DC voltage is
needed.

Voltages below
70VDC are polarity
sensitive.

Voltage

12
24
36
48

95
115
230

11

Series 56,000 (1-056-0XX-00) &
Series 56,000-80 (1-056-0XX-80)

Mounting Face: NEMA 56C,
143TC and 145TC

4.5” AK, 5.88” AJ

BACK TO T ABLE OF CONTENTS

Series 56,000

Nominal Static

Torque lb-ft

(Nm)

1.5 (2)

3 (4)

6 (8)

10 (14)

15 (20)

20 (27)

25 (34)

Enclosure

IP 23 1-056-001-00 1-056-005-00
IP 54 1-056-002-00 1-056-006-00
IP 55 1-056-004-00 1-056-008-00
IP 23 1-056-011-00 1-056-015-00
IP 54 1-056-012-00 1-056-016-00
IP 55 1-056-014-00 1-056-018-00
IP 23 1-056-021-00 1-056-025-00
IP 54 1-056-022-00 1-056-026-00
IP 55 1-056-024-00 1-056-028-00
IP 23 1-056-031-00 1-056-035-00
IP 54 1-056-032-00 1-056-036-00
IP 55 1-056-034-00 1-056-038-00
IP 23 1-056-041-00 1-056-045-00
IP 54 1-056-042-00 1-056-046-00
IP 55 1-056-044-00 1-056-048-00
IP 23 1-056-051-00 1-056-055-00
IP 54 1-056-052-00 1-056-056-00
IP 55 1-056-054-00 1-056-058-00
IP 23 1-056-061-00 1-056-065-00
IP 54 1-056-062-00 1-056-066-00
IP 55 1-056-064-00 1-056-068-00

Basic Model Number

AC DC

Series 56,000-80*

Nominal Static

Torque lb-ft (Nm)

1.5 (2) IP 54 1-056-002-80* 1-056-006-80*
3 (4) IP 54 1-056-012-80* 1-056-016-80*
6 (8) IP 54 1-056-022-80* 1-056-026-80*

10 (14) IP 54 1-056-032-80* 1-056-036-80*
15 (20) IP 54 1-056-042-80* 1-056-046-80*
20 (27) IP 54 1-056-052-80* 1-056-056-80*
25 (34) IP 54 1-056-062-80* 1-056-066-80*

Enclosure

* 56,000-80 Series includes a C-face gasket only, no

hub seal.

12

Basic Model Number

AC DC

Dimensions for estimating only.
For installation purposes request certified prints.

Enclosure: Lightweight Steel Housing, Aluminum Endplate
Enclosure Protection: IP 23, 54 & 55

(formerly referred to by Stearns as NEMA 2, 4 & 4X* respectively)
(*BISSC certified)

Mounting: Fanguard mounted brakes requiring IP 54 or IP 55
protection may require additional sealing measures beyond seals
provided with the brake. Refer to Installation & Service Instruction
sheets.

Installation and Service: P/N 8-078-905-60
Parts List: P/N 8-078-906-00
Modifications: Pages 54-63

IP 23 Dimensions

Nominal

Static Torque

lb-ft (Nm)

1.5 (2)
3 (4) 8 (3.6)
6 (8) 8 (3.6)

10 (14) 8 (3.6)
15 (20) 8 (3.6)
20 (27)
25 (34) 9 (4.0)

(103.1)

(114.3)

Dimensions in Inches

(Dimensions in Millimeters)

.52

(13.2)

.52

(13.2)

C Hub

Width

.81

(20.6)

1.18

(30.0)

AAG

4.06

4.50

GJ

1.23

1.66

.31

(7.9)

.31

(7.9)

(31.2)

(42.2)

Wt lbs

(Kg)

8 (3.6)

9 (4.0)

IP 54 / 55 Dimensions

Nominal

Static

Torque lb-ft

(Nm)

1.5 (2)
3 (4) 8 (3.6)

6 (8) 8 (3.6)

10 (14)
15 (20) 9 (4.0)
20 (27) 9 (4.0)
25 (34) 9 (4.0)

(103.1)

(114.6)

Dimensions in Inches

(Dimensions in Millimeters)

.47

(11.9)

.59

(15.0)

C Hub
Width

.81

(20.6)

1.18

(30.0)

AAG

4.06

4.51

GJ

1.21

1.66

.37

(9.4)

.37

(9.4)

(30.7)

(42.2)

Wt lbs

(Kg)

8 (3.6)

9 (4.0)