Stearns Series 81000, Series 82000 Catalog Page

.

Series 81,000 and 82,000

Mounting Face NEMA 324 and 326TC, TSC, UC
or USC, NEMA 364 and 365TC, TSC, UC or USC
NEMA 404 and 405 TC, TSC, UC or USC

81,000 Series Specifications

Nominal

Static

Torque

lb-ft

(Nm)

125

(169)

175

(237)

230

(312)

No. of

Friction

Discs

Coil

Size

82,000 Series Specifications

Nominal

Static

Torque

lb-ft

(Nm)

125

(169)

175

(237)

230

(312)

330

(447)

440

(597)

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. Derate thermal capacity by 25% for vertical mounting.

No. of

Friction

Discs

2
2

3
4

Coil
Size

DCAC

99
99

9K9
9K9

Maximum

Solenoid

Cycle Rate

cycles/min

1592
1592
1593

Maximum

Solenoid

Cycle Rate

cycles/min

DCAC

15

15

1

1

1515
1515993
1513
1513

Thermal

Capacity

hp-sec/min

(watts)

30

(373)

30

(373)

30

(373)

Thermal

Capacity

hp-sec/min

(watts)

50

(621)

50

(621)

50

(621)

50

(621)

50

(621)

Inertia (Wk2)

2

lb-ft

(kgm2 x 10-3)

(11.76)

Inertia (Wk2)

2

lb-ft

(kgm2 x 10-3)

(20.58)
(20.58)
(29.57)
(29.57)
(38.56)

2

.192

(8.06)

.192

(8.06)

.280

2

.490
.490
.704
.704
.918

BACK TO T ABLE OF CONTENTS

Current Ratings (amperes)

Coil
Size

9

K9

Frequency

60 Hz

50 Hz

DC

60 Hz

50 Hz

DC

Voltage

115
200
230
400
460
575
110
220
380

24

95
115
230
115
200
230
400
460
575
110
220
380

—

—

—

Current

44.0

25.4

22.0

12.7

11.4

8.8

32.1

16.0

11.1

56.4

14.9

11.4

5.9

50.0

28.0

25.0

14.0

12.5

10.0

36.0

24.0

12.5
—
—
—

HoldingInrush

1.6
.9
.8
.5
.4
.3

1.2
.6
.4
.7
.2

.07

2.2

1.3

1.1
.6
.6

4

1.6
.9
.6
—
—
—

22

Ordering and Identification Information

The following example and tables provide information for selecting the
appropriate three-letter suffix when ordering a Stearns Brake.

Example of a complete part number, Series 81,000:
1-081-011-02-NLF Lead wire position

81,000 Series
Hub Selection

Bore

Char-

(in.)

acter

1 1/8

A

1 1/4

*

B
C

1 3/8

D

1 1/2

1 9/16

E*

1 5/8

F

1 11/16

*

G
H

1 3/4

1 13/16

I*

1 7/8

J

1 15/16

K

*

L*

2

2 1/16

M*

2 1/8

N

2 3/16

O*
P*

2 1/4

2 5/16

Q*

2 3/8

R

2 7/16

*

S
T

2 1/2

Maximum allowable bore 2.500
in. (76.200 mm) (maximum shaft
length not to exceed end of hub)

* These bores are non-standard.
** Keyseats made to ANSI B17.1

standard.

(internal and external, left and right)
460 Vac

2-1/8 bore and 1/2 x 1/4 keyway

82,000 Series
Hub Selection

Bore

Keyway**

(in. x in.)

1/4 X 1/8
1/4 X 1/8

5/16 X 5/32

3/8 X 3/16
3/8 X 3/16

3/8 X 3/16
3/8 X 3/16
3/8 X 3/16

1/2 x 1/4
1/2 x 1/4
1/2 x 1/4
1/2 x 1/4

1/2 x 1/4
1/2 x 1/4
1/2 x 1/4
1/2 x 1/4

5/8 x 5/16
5/8 x 5/16
5/8 x 5/16
5/8 x 5/16

pilot bore1 1/8W

Char-

(in.)

acter

1 1/8

A

1 1/4

*

B
C

1 3/8

D

1 1/2

1 9/16

E*

1 5/8

F

1 11/16

G

*

H

1 3/4

1 13/16

I*

1 7/8

J

1 15/16

K*
L*

2 1/16

M*

2 1/8

N

2 3/16

O

*

P*

2 1/4

2 5/16

Q*

2 3/8

R

2 7/16

S*

T

2 1/2
2 5/8

U*

2 3/4

V*

1 1/8

W

X

2 7/8

2 15/16

Y*

Z*

Maximum allowable bore 3.000 in. (76.200 mm)
(maximum shaft length not to exceed end of hub)

* These bores are non-standard.
** Keyseats made to ANSI

B17.1 standard.

2

3

Keyway**

(in. x in.)

1/4 X 1/8
1/4 X 1/8

5/16 X 5/32

3/8 X 3/16
3/8 X 3/16

3/8 X 3/16
3/8 X 3/16
3/8 X 3/16

1/2 x 1/4
1/2 x 1/4
1/2 x 1/4
1/2 x 1/4

1/2 x 1/4
1/2 x 1/4
1/2 x 1/4
1/2 x 1/4

5/8 x 5/16
5/8 x 5/16
5/8 x 5/16
5/8 x 5/16

5/8 x 5/16
5/8 x 5/16

pilot bore

3/4 x 3/8
3/4 x 3/8

3/4 x 3/8

Example of a complete part number, Series 82,000:
1-082-012-02-NLF Lead wire position

(internal and external, left and right)
460 Vac

2-1/8 bore and 1/2 x 1/4 keyway

Standard AC Voltage Ratings

HzVoltageCharacter

60 115B
50 110D
60 200E

F

L

Q

230
190

460
380

230/460
190/380

60
50

50 220H
60

50
50 415M

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

60
50

60 200/400R

Direct Current

W

Consult factory if other DC
voltage is needed.

Modifications are available- see SAB Modification Section

VoltageCharacter

U
V

X
Y
Z

24
36
48

95
115
230

Series 81,000 (1-081-0XX)

Mounting Face: NEMA 324 and 326 TC, TSC, UC
or USC, NEMA 364 and 365 TC, TSC, UC or USC,
NEMA 404 and 405 TC, TSC, UC or USC

12.5” AK, 11.0” AJ

Static Torque: 125 through 230 lb-ft
Enclosure Material: Cast Iron
Release Type: Knob, maintained with automatic

reset. Vertical above IP 54 supplied with side release
lever.

Enclosure Protection: IP 23 and 54 (formerly
referred to by Stearns as NEMA Type 2 & 4,
respectively).

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

Installation, Service and Parts List: P/N 8-078-921-00
Specifications, bores/voltages: Page 22
Modifications: Pages 54-63

Modification required for vertical mounting. Vertical above IP 54
includes side release. See SAB Modifications for details.

BACK TO T ABLE OF CONTENTS

• Self-Adjusting Design

• Splined Hub

• Spring-Set Electrically Released

• Lead Wire Length: 36 inches

• Maximum Speed: 3600 Horizontal
2400 Vertical

• Coil Insulation: Standard Class B
Optional Class H

• Certified: CSA File LR-6254

• ABS Type Approval Certified

Brake set and release times in

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

Static

Torque

Coil Size T1 T2

All 9 56 27

* Hub location.

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

Dimensional Data

Dimensions in Inches

Nominal

Static Torque

(lb-ft) (Nm)

(169)

(169)

(237)

(237)

(312)

(312)

New! 9th digit indicates aluminum or cast iron housing



125

125

175

175

230

230

Enclosure Type

IP 23

IP 54

IP 23

IP 54

IP 23

IP 54

AC
DC
AC
DC

AC
DC

AC
DC

AC
DC

AC
DC

Basic Model

Number

1-081-011-0X
1-081-015-0X
1-081-012-0X
1-081-016-0X

1-081-021-0X
1-081-025-0X

1-081-022-0X
1-081-026-0X

1-081-031-0X
1-081-035-0X

1-081-032-0X
1-081-036-0X

2 = Cast Iron
3 = Aluminum: Add .38” to “A” dimension



Subtract 21 lbs. for aluminum housing. Foot mounting adds 40 lbs (18.2 kg) to weight.

(Dimensions in Millimeters)

A

Cast

AE AG C

Iron

10.81
(274.64)

10.88
(276.22)

10.81
(274.64)

10.88
(276.22)

11.31
(287.34)

11.38
(288.92)

2.56

(65.09)

2.56

(65.09)

2.56

(65.09)

2.56

(65.09)

3.06

(77.79)

3.06

(77.79)

.94

(23.81)

.94

(23.81)

.94

(23.81)

.94

(23.81)

1.44

(36.51)

1.44

(36.51)

1.44

(36.51)

1.44

(36.51)

1.44

(36.51)

1.44

(36.51)

1.94

(49.21)

1.94

(49.21)

Cast
Iron
Wt. lbs

(kg)

148

(67.0)

151

(69.0)

148

(67.0)

151

(69.0)

155

(70.0)

158

(72.0)

Motor Frame Adapters

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.

AK
To Adapt
to NEMA

Frame Size

182TC, 184TC,
213TC, 215TC,

254TC or 256TC
284TC or 286TC

444TSC and

445TSC

For adapter dimensions, see Technical Data.

Dim.

in

(mm)

8.50
(215.90)

10.50
(266.70)

16.00
(406.40)

Reg.

No.

-9

-11

-16

Adapter

Stock

Number

5-55-2041-00

List $1325

5-55-2043-00

List $1325

5-55-2045-00

List $1875

Additional

Shaft

Length

Required

in.

(mm)

.94
(23.81)

.94
(23.81)
.88
(22.22)

23