Machine Components Corp. - Spring Wrapped Slip Clutch – PB Series - Compare Items

Features

Integral toothed pulley
Long life under continuous slip conditions
Unidirectional or bidirectional operation
Same or different CW and CCW torques
Small in size
Precise and stable limit torque calibration
Torque range: 2.0 to 600 oz·in
Same torque at breakaway as at high slip velocities
Corrosion resistant materials

Applications

Tension control of film or tape drives
Transmission overload protection

Federal supply code - 15531

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Unit of Measure

Items	PB-301 Spring Wrapped Slip Clutch – PB Series	PB-302 Spring Wrapped Slip Clutch – PB Series	PB-303 Spring Wrapped Slip Clutch – PB Series	PB-401 Spring Wrapped Slip Clutch – PB Series	PB-403 Spring Wrapped Slip Clutch – PB Series
Upper Limit Torque (oz·in)¹	N/A 20 ± 2	N/A 20 ± 2	N/A 20 ± 2	N/A 48 ± 5	N/A 48 ± 5
Unit Weight	N/A 5 oz	N/A 5 oz	N/A 5 oz	N/A 7 oz	N/A 7 oz
Pitch Belt	N/A 1/5 in
A ± .03 (in)	N/A 1.24	N/A 1.24	N/A 1.24	N/A 1.39	N/A 1.39
B + .0010 (in)	N/A .1875	N/A .2500	N/A .3125	N/A .2500	N/A .3125
C (in)	N/A .21	N/A .21	N/A .21	N/A .23	N/A .23
D ± .03 (in)	N/A .87	N/A .87	N/A .87	N/A 1.01	N/A 1.01
E (in)	N/A 1.00	N/A 1.00	N/A 1.00	N/A 1.25	N/A 1.25
F (in)	N/A .50
G	N/A #4-40	N/A #4-40	N/A #4-40	N/A #6-32	N/A #6-32
Number of Pulley Teeth²	N/A 22 24 28 30 32 36 40 42 44 48	N/A 22 24 28 30 32 36 40 42 44 48	N/A 22 24 28 30 32 36 40 42 44 48	N/A 28 30 32 36 40 42 44 48	N/A 28 30 32 36 40 42 44 48
¹ Stock units are calibrated with equal cw and ccw slip torques corresponding to the tabulated Upper Limit Torque listed in the table above. Clutches can also be calibrated with slip torque values lower then the maximum values shown. When ordering the CW and CCW slip torque values may be specified anywhere from the full torque value listed, to a lower value of approximately 1/8 of this maximum, and may be specified the same or different for each of the two directions of rotation. ² 1/5 pitch (3/8" pitch available)