Stearns Series 33X Catalog Page
Series 33X
Armature Actuated Brakes
Direct Replacement for European Brakes - *Kebco, Lenze, and Binder
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The 33X Series have the following design features:
• Direct Acting
• Torque rating 3 to 300 lb-ft (4 to 400 NM)
• UL Recognized Class H coil insulation
system to US Standards (UR) and
Canadian National Standards (CUR) File E125303
• Spring-set and DC voltage released AC rectifiers optional
• Series 333 torque adjustable
• Pre-adjusted air gap for easy assembly
• Corrosion resistance
• Spline hub for quiet dependable operation
• Metric and US Customary bore sizes
Product Overview
333 Series
Static torque from 3 to 300 lb-ft, with nine
different sizes ranging from 72mm bolt circle
up to 278 mm bolt circle.
Torque can be adjusted down to
approximately 50% of the nameplate
torque rating.
Shown here with optional nonmaintained manual release lever;
other options include boot (band seal),
end cap plug, through-shaft seal, and
many more listed in the AAB Modification
Section.
33X Series Enclosed
Series 33X with a C-face adaptor and a brake housing.
Order as an IP43 Enclosure with or without external
manual release:
33B Series for brake without torque adjust
33C Series for brake with torque adjust
OR IP54 Enclosure with the option of
internal maintained manual release:
33H Series for brake without torque adjust
33J Series for brake with torque adjust
Options:
• AC rectifiers (full and half
wave) See pages 86-89 for
rectifier specifications
• Band seal (boot)
• Tach/encoder Mounting
• Manual release - NonMaintained or Maintained
• Shaft seal
• Mounting flange
• Electronic brake
release indicator switch
331 Series
Basic brake without the torque adjust option.
Available in torque ratings from 3 to 300 lb-ft
(4 to 400 Nm).
Manual release optional, can be provided
with non-maintained release lever or
maintained release bolts.
Metric mount; also can be ordered with
C-face adaptor or as the C-face Enclosed
version, and as Severe Duty.
33X Series with C-face Adaptor
Series 331 or Series 333 can be provided
with a C-face adaptor for motor frames from
48C through 404/405TC, TSC, UC, USC.
All other available modifications for the
33X Series can be ordered for this
brake.
Also Available.....
330 Series
Magnet body is not machined for a manual release
See ordering information for the 33X Series
option.
brakes.
33X Severe Duty
Any of the 33X Series can be ordered as Severe Duty,
appropriate for high-cycle rate applications. See ordering
information for the 33X series brakes.
332 Series
Basic brake with the torque adjust option, and the magnet
body not machined for the manual release option. See
ordering information for the 33X series brakes.
* Kebco is a Registered Trademark of Kebco, Inc. or its affiliates. Lenze is a Registered Trademark of Lenze Power Transmission or its
affiliates. Binder is a Registered Trademark of Kendrion or its affiliates.
79
Series 331 (without torque adjust) & Series 333 (torque adjustable)
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Armature Actuated Brakes
Dimensions
Sizes 72 thru 170
3.85
97.8
4.52
114.8
5.08
129.0
5.47
138.9
6.90
175.3
7.73
196.3
AG
Set screw
location
English
bores only
.355
9.02
.394
10.01
.393
9.98
.492
12.50
.590
14.99
.590
14.99
1.00
25.4
444.5
1.00
25.4
444.5
.950
24.13
444.5
.950
24.13
444.5
1.25
31.9
444.5
1.25
31.9
17.5
17.5
17.5
17.5
17.5
23.6
600
A H
Thick
Thin
No
Plate
2.016
51.20
2.275
57.78
2.771
70.38
3.001
76.23
3.696
93.88
3.781
96.04
Plate
1.838
46.68
2.057
52.24
2.475
62.86
2.705
68.71
3.321
84.35
3.406
86.51
Plate
1.780
45.20
1.999
50.77
2.417
61.38
2.647
67.23
3.263
82.88
3.348
85.04
Thick
Plate
0.236 60.058
0.276 70.058
0.354 90.058
0.354 90.058
0.433 110.058
0.433 110.058
D K
Thin
Plate
3.346 852.835 720.257
1.47
4.016
1.47
102
5.000
1.47
127
5.787
1.47
147
6.457
1.47
164
7.480
1.47
190
N
333
Series
only
6.52
3.543 900.257
6.52
4.409
0.287
112
7.29
5.197
0.327
132
8.30
5.709
0.366
145
9.30
6.693
0.380
170
9.65
n torque
adjust bolts
333 series
only
3
4
3
4
4
4
Basic
Torque
Size
Model
Number
72 33X-14010 3 (4)
33X-24010 6 (8)
90
112 33X-34010 12 (16)
132
33X-44010 25 (32)
145 33X-54010 45 (60)
170 33X-64010 60 (80)
Basic
Size
Model
Number
72 33X-14010
90 33X-24010
112 33X-34010
33X-44010
132
145 33X-54010
170 33X-64010
* Without keyway pilot bore. ** Keyway to DIN 6885/3 p9 - standard metric keyway DIN 6885/1 p9. 1 Size 132: ”h2” and “h3” dimensions, contact factory. May vary .09 inch.
For verification of manual release dimensions, contact factory.
D1
lb-ft
(Nm)
d1 d2 d3 d5 d6
0.787 201.181 300.177
1.181 301.772 450.217
1.575 402.205 560.261
1.772 452.441 620.261
2.165 552.913 740.354 90.354 96.299
2.559 653.307 840.354 90.354 97.283
Max
3.56
90.4
4.48
113.8
5.39
136.9
6.19
157.2
6.81
173
7.80
198
B
3 x M4
3 x M5
3 x M6
3 x M6
3 x M8
3 x M8
4.5
5.5
6.6
6.6
X
Min.
Bore
Bore
3/8 9*9/16 150.709 181.183
1/2 9*3/4
16, 20**
5/8
10*
22, 24**
7/8
1-1/8
14*
25, 28**
7/8
1-1/8
14*
30, 34**
1-1/8
1-3/8
15*
35, 38**
0.177
3.268 830.905 230.727
4.5
0.217
3.937
5.5
100
0.261
4.921
6.6
125
0.261
5.709
6.6
145
160
185
C
Hub
Max.
length
0.787 201.183
7/8
0.787 201.262
0.984 251.380
1.181 301.577 400.130
1.181 301.852
h1
Thick
Thin
Plate
Plate
18.47
0.985 250.767
19.48
1.338 341.042
26.47
1.200 310.924
23.47
1.575 401.200
30.48
1.338 341.042
26.47
E FRecommended
Hub Location
0.070
30
30
32
35
47
1.78
0.070
1.78
0.105
2.67
0.105
2.67
3.30
0.133
3.38
h21h31h4 w1
No
Plate
0.669 172.05
52.1
0.709 182.33
59.2
0.984 252.96
75.2
0.866 223.35
85.1
1.142 293.95
100.3
0.984 254.69
119.1
80
Specifications - Sizes 72 thru 170
Nominal
Static
Size
Bolt
Part Number
Circle
(mm)
72 33X-14010-XX-XX 3 (4) .002 .84 2.28 (1.03) 3600 24 2
90 33X-24010-XX-XX 6 (8) .003 1.26 4 (1.81) 3600 29 3
112 33X-34010-XX-XX 12 (16) .005 2.10 6.78 (3.07) 3600 32 4
132 33X-44010-XX-XX 25 (32) .011 4.62 11.42 (5.18) 3600 49 6
145 33X-54010-XX-XX 45 (60) .019 7.98 14.45 (6.55) 3600 62 12
170 33X-64010-XX-XX 60 (80) .041 17.22 22.6 (10.25) 3600 76 13
Torque
lb-ft
(Nm)
Inertia (Wk
Kgm2
2
lb-ft
x 10
Approx
2
)
Weight
lbs (Kg)
-4
RPM
Max
Power
(Watts)
Thermal
Capacity
Hp-Sec/Min
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