Constant Torque Slip Clutches

Tooth Pulley Type PB Series

Constant Torque Slip Clutches - Tooth Pulley Slip Clutches - Machine Components Corporation

FEATURES
•	INTEGRAL TOOTHED PULLEY
•	LONG LIFE UNDER CONTINUOUS SLIP CONDITIONS
•	UNIDIRECTIONAL OR BIDIRECTINAL 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

Constant Torque Slip Clutches - Tooth Pulley Slip Clutches - Machine Components Corporation

MODEL NUMBER	*UPPER LIMIT TORQUE (oz.-in.)	•UNIT WT. (oz.)	A ±.03	B ±.0010	C	D ±.03	E	F	G	NO. OF PULLEY TEETH
PB-301 PB-302 PB-303	20 ± 2	5	1.24	.1873 .2498 .3123	.21	.87	1.00	.50	#4-40	22-48
PB-401 PB-403	48 ± 5	7	1.39	.2498 .3123	.23	1.01	1.25	.50	#6-32	28-48
PB-500 PB-503	80 ± 8	11	1.39	.2498 .3123	.23	1.01	1.50	.63	#6-32	32-48
PB-600 PB-603	120 ± 12	16	1.67	.2498 .3123	.25	1.29	1.87	.63	#6-32	36-48
PB-653 PB-654 PB-655	150 ± 13	20	1.88	.3123 .3748 .4998	.29	1.47	1.87	1.00	#8-32	36-48
PB-702 PB-703 PB-704 PB-705	240 ± 24	24	1.88	.2498 .3123 .3748 .4998	.29	1.47	2.25	1.00	#8-32	40-48
PB-803 PB-804 PB-805	360 ± 36 CW or CCW 480 ± 48 CW or CCW	30	1.88	.3123 .3748 .4998	.32	1.47	2.62	1.00	#10-32	44-48
PB-906 PB-907 PB-908	480 ± 50 CW or CCW 600 ± 60 CW or CCW	40	2.30	.6250 .7500 .8750		1.88	2.85		1/4-20 2@120º	60

NUMBER OF TEETH	22	24	28	30	32	36	40	42	44	48	60
PITCH DIAMETER (IN.)	1.401	1.528	1.783	1.910	2.037	2.292	2.546	2.674	2.801	3.056	3.820
FLANGE DIAMETER (IN.)	1.62	1.75	2.00	2.12	-	-	-	-	-	-	-
Federal Suply Code-15531 Covered by US Patents and Patents Pending

*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.
•Weight listed is for clutch with the largest available pulley. †3/8" pitch available.

ORDERING INFORMATION	Example
1. Model Number	PB-401
2. Number of teeth	32
3. Specify Limit Torque (viewed from pulleyend) CW Direction CCW Direction	48oz.-in. 8oz.-in..
4. Nitride surface treatment	Add prefix "H"
5. Optional clamp typehub	Add prefix "C"
6. Metric Size Bores Available on special order	Consult factory

PB Series slip clutches are designed for long life slip conditions. The useful life of these elements is a function of transmitted torque and slip speed. Refer to page A-2 for the method of estimating life for a particular application. The service life factors are based on continuos duty testing on mildly hard wear surfaces. Service life may be extended by a factor of approximately 4X by specifying Nitride surface treatment in wear-critical applications.

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