Clutch Motor Controls | McMaster-Carr

	For Shaft Diameter For Shaft Diameter

	Maximum Torque Maximum Torque

	For Shaft Type For Shaft Type

	Round
	Keyed

	Maximum Speed Maximum Speed

	Overall Length Overall Length

	OD OD

	Torque-Limiting Mechanism Torque-Limiting Mechanism

Disengages

Brake

	Torque Adjustability Torque Adjustability

Adjustable

Fixed

	Torque-Limiting Direction Torque-Limiting Direction

Clockwise and
Counterclockwise

Clockwise

Counterclockwise

	Construction Construction


One Piece	Two Piece

	Shaft Mount Type Shaft Mount Type

Set Screw

Spring Pin

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Mounting Hole Thread Size Mounting Hole Thread Size

	Minimum Torque Minimum Torque

	Power Source Power Source

Air

Electric

	Shaft Diameter Shaft Diameter

	Mounting Hole Thread Pitch Mounting Hole Thread Pitch

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Keyway Width Keyway Width

	Shaft Type Shaft Type

D-Profile

Keyed

Round

	Keyway Depth Keyway Depth

	Wire Lead Length Wire Lead Length

64 Products

Air-Powered Torque-Limiting Shaft-to-Gear Couplings

For Round Shafts

For Keyed Shafts

Often used in automated systems, these couplings are both air actuated and remotely adjustable, so you can adjust the torque setting even during operation. In the event of excess torque, they slip to protect motors and drivetrains, and then resume driving once the load has been reduced.

For technical drawings and 3-D models, click on a part number.

						Keyway			Air Inlet
For Shaft Dia.	Max. Torque	Max. Pressure, psi	Max. Speed	OD	Overall Lg.	Wd.	Dp.	Torque-Limiting Direction	Thread Size	Thread Type	Gender	Mounting Hole Thread Size		Each
For Round Shafts
1/4"	20 in.-lbs. @ 100 psi	100	Not Rated	1 1/4"	2 1/2"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	4-40	0000000	0000000
3/8"	50 in.-lbs. @ 100 psi	100	Not Rated	1 1/2"	3 3/8"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	6-32	0000000	000000
1/2"	100 in.-lbs. @ 100 psi	100	Not Rated	2"	3 5/8"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	6-32	0000000	000000
5/8"	300 in.-lbs. @ 100 psi	100	Not Rated	2 3/4"	3 5/8"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	8-32	0000000	000000
For Keyed Shafts
1/4"	20 in.-lbs. @ 100 psi	100	Not Rated	1 1/4"	2 1/2"	1/16"	1/32"	Clockwise and Counterclockwise	10-32	UNF	Female	4-40	0000000	000000
3/8"	50 in.-lbs. @ 100 psi	100	Not Rated	1 1/2"	3 3/8"	3/32"	3/64"	Clockwise and Counterclockwise	10-32	UNF	Female	6-32	0000000	000000
1/2"	100 in.-lbs. @ 100 psi	100	Not Rated	2"	3 5/8"	1/8"	1/16"	Clockwise and Counterclockwise	10-32	UNF	Female	6-32	0000000	000000
5/8"	300 in.-lbs. @ 100 psi	100	Not Rated	2 3/4"	3 5/8"	3/16"	3/32"	Clockwise and Counterclockwise	10-32	UNF	Female	8-32	0000000	000000

Torque-Limiting Shaft-to-Gear Couplings

For Round Shafts

For Keyed Shafts

Adjust your system's torque limit by hand. In the event of excess torque, these couplings slip to protect motors and drivetrains, and then resume driving once the load has been reduced. You can adjust the torque level without removing them from your shaft.

For technical drawings and 3-D models, click on a part number.

					Keyway
For Shaft Dia.	Max. Torque	Max. Speed, rpm	OD	Overall Lg.	Wd.	Dp.	Torque-Limiting Direction	Mounting Hole Thread Size		Each
For Round Shafts
1/4"	16 in.-lbs. @ 50 rpm	50	1"	1 1/2"	__	__	Clockwise and Counterclockwise	4-40	0000000	0000000
3/8"	16 in.-lbs. @ 50 rpm	50	1"	1 1/2"	__	__	Clockwise and Counterclockwise	4-40	0000000	000000
3/8"	25 in.-lbs. @ 50 rpm	50	1 3/8"	2 1/2"	__	__	Clockwise and Counterclockwise	6-32	0000000	000000
1/2"	25 in.-lbs. @ 50 rpm	50	1 3/8"	2 1/2"	__	__	Clockwise and Counterclockwise	6-32	0000000	000000
1/2"	50 in.-lbs. @ 50 rpm	50	1 5/8"	2 1/2"	__	__	Clockwise and Counterclockwise	6-32	0000000	000000
1/2"	75 in.-lbs. @ 50 rpm	50	2 1/4"	2 1/2"	__	__	Clockwise and Counterclockwise	8-32	0000000	000000
5/8"	50 in.-lbs. @ 50 rpm	50	1 5/8"	2 1/2"	__	__	Clockwise and Counterclockwise	6-32	0000000	000000
5/8"	75 in.-lbs. @ 50 rpm	50	2 1/4"	2 1/2"	__	__	Clockwise and Counterclockwise	8-32	0000000	000000
For Keyed Shafts
1/4"	16 in.-lbs. @ 50 rpm	50	1"	1 1/2"	1/16"	1/32"	Clockwise and Counterclockwise	4-40	0000000	000000
3/8"	25 in.-lbs. @ 50 rpm	50	1 3/8"	2 1/2"	3/32"	3/64"	Clockwise and Counterclockwise	6-32	0000000	000000
1/2"	50 in.-lbs. @ 50 rpm	50	1 5/8"	2 1/2"	1/8"	1/16"	Clockwise and Counterclockwise	6-32	0000000	000000
1/2"	75 in.-lbs. @ 50 rpm	50	2 1/4"	2 1/2"	1/8"	1/16"	Clockwise and Counterclockwise	8-32	0000000	000000

Magnetic Torque-Limiting Shaft-to-Gear Couplings

Also known as hysteresis clutches, these couplings use magnetic force to brake, control tension, and prevent torque overload. They have few moving parts, so they last longer than mechanical couplings. Twist the adjustment ring to set the torque within the range listed, then lock the ring in place with the included set screw.

For technical drawings and 3-D models, click on a part number.

Torque, in.-lbs						Mounting Hole
Min.	Max.	Max. Speed, rpm	OD	Overall Lg.	Torque-Limiting Direction	Thread Size	Thread Pitch, mm	For Shaft Dia.		Each
0.06	1.25	880	1 15/16"	1 5/8"	Clockwise and Counterclockwise	M4	0.7	1/4"	000000	0000000
0.18	5	300	2 3/4"	2 7/16"	Clockwise and Counterclockwise	M4	0.7	3/8"	000000	000000
0.5	10.6	220	3 5/16"	2 1/2"	Clockwise and Counterclockwise	M5	0.8	3/8", 1/2", 5/8"	000000	000000
1	25	250	4 11/16"	3 1/8"	Clockwise and Counterclockwise	M5	0.8	3/8", 1/2", 5/8", 3/4", 7/8", 1"	000000	000000
2	50	200	5 1/4"	3 1/8"	Clockwise and Counterclockwise	M5	0.8	3/8", 1/2", 5/8", 3/4", 7/8", 1"	000000	000000
3	70	200	6 5/16"	4 1/8"	Clockwise and Counterclockwise	1/4"-20	__	5/8", 3/4", 7/8"	000000	00000000

Magnetic Torque-Limiting Shaft-to-Gear Couplings with Shaft

For technical drawings and 3-D models, click on a part number.

	Torque, in.-lbs.							Mounting Hole
Shaft Dia.	Min.	Max.	Max. Speed, rpm	OD	Overall Lg.	Shaft Type	Torque-Limiting Direction	Thread Size	Thread Pitch, mm		Each
3/16"	0.01	0.06	2,000	1"	1 3/8"	D-Profile	Clockwise and Counterclockwise	M3	0.5	0000000	0000000
3/16"	0.01	0.13	1,500	1"	1 3/8"	D-Profile	Clockwise and Counterclockwise	M3	0.5	0000000	000000
5/16"	0.03	0.44	1,050	1 7/16"	1 3/4"	D-Profile	Clockwise and Counterclockwise	M3	0.5	0000000	000000

Electromagnetic Tensioning, Holding, and Stopping Shaft-to-Gear Couplings

Also known as electric hysteresis brakes, these couplings use magnetic force to create drag to slow or stop the motion of your drive system. Use them with a current-limiting transformer to adjust the electrical current, which controls the amount of torque applied.

For technical drawings and 3-D models, click on a part number.

						Keyway						Mounting Hole
Shaft Dia.	Max. Torque, in.-lbs.	Max. Speed, rpm	OD	Overall Lg.	Shaft Type	Wd.	Dp.	Torque-Limiting Direction	Electrical Connection Type	Wire Lead Lg.	Voltage	Thread Size	Thread Pitch, mm		Each
0.118"	0.2	1,990	1 1/4"	1 5/8"	Round	__	__	Clockwise and Counterclockwise	Hardwire	18"	24V DC	M2.5	0.45	0000000	0000000
0.197"	0.8	1,200	1 13/16"	2"	D-Profile	__	__	Clockwise and Counterclockwise	Hardwire	18"	24V DC	M2.5	0.45	0000000	000000
0.197"	1.3	760	2"	2 1/8"	D-Profile	__	__	Clockwise and Counterclockwise	Hardwire	18"	24V DC	M3	0.5	0000000	000000
0.276"	3.5	570	2 3/8"	3"	D-Profile	__	__	Clockwise and Counterclockwise	Hardwire	18"	24V DC	M4	0.7	0000000	000000
0.394"	11	590	3 5/8"	4"	D-Profile	__	__	Clockwise and Counterclockwise	Hardwire	18"	24V DC	M4	0.7	0000000	000000
0.472"	19	500	4 7/16"	4 7/8"	Keyed	0.158"	0.098"	Clockwise and Counterclockwise	Hardwire	18"	24V DC	M5	0.8	0000000	000000
0.590"	32	420	5 7/16"	5 1/8"	Keyed	0.197"	0.124"	Clockwise and Counterclockwise	Hardwire	18"	24V DC	M5	0.8	0000000	00000000

Electromagnetic Torque-Limiting Shaft-to-Gear Couplings

Use these with an overload sensor in an automated system to instantly disconnect power and prevent damage. Couplings also accelerate loads from zero to full speed in less than three milliseconds when the power is turned on.

								Clockwise Torque-Limiting Direction		Counterclockwise Torque-Limiting Direction
For Shaft Dia.	Max. Torque, in.-lbs.	Max. Speed, rpm	OD	Overall Lg.	Electrical Connection Type	Wire Lead Lg.	Voltage		Each		Each
1/4"	30	1,400	1 1/4"	1 1/8"	Hardwire	15"	24V DC	0000000	000000	0000000	000000
5/16"	30	1,400	1 1/4"	1 1/8"	Hardwire	15"	24V DC	0000000	00000	0000000	00000
3/8"	75	1,400	1 3/4"	1 1/2"	Hardwire	18"	24V DC	0000000	000000	0000000	000000
1/2"	75	1,400	1 3/4"	1 1/2"	Hardwire	18"	24V DC	0000000	000000	0000000	000000

Air-Powered Torque-Limiting Shaft Couplings

For Round Shafts

For Keyed Shafts

Often used in automated systems, these couplings are air actuated so you can adjust the torque during operation. In the event of excess torque, they slip to protect motors and drivetrains, and then resume driving once the load has been reduced. You can adjust the torque level without removing them from your shaft.

For technical drawings and 3-D models, click on a part number.

						Keyway			Air Inlet
For Shaft Dia.	Max. Torque	Max. Pressure, psi	Max. Speed	OD	Overall Lg.	Wd.	Dp.	Torque-Limiting Direction	Thread Size	Thread Type	Gender		Each
For Round Shafts
1/4"	20 in.-lbs. @ 100 psi	100	Not Rated	1 1/4"	2 1/2"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	0000000
3/8"	50 in.-lbs. @ 100 psi	100	Not Rated	1 1/2"	3 3/8"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	000000
1/2"	100 in.-lbs. @ 100 psi	100	Not Rated	2"	3 5/8"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	000000
5/8"	300 in.-lbs. @ 100 psi	100	Not Rated	2 3/4"	3 5/8"	__	__	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	000000
For Keyed Shafts
1/4"	20 in.-lbs. @ 100 psi	100	Not Rated	1 1/4"	2 1/2"	1/16"	1/32"	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	000000
3/8"	50 in.-lbs. @ 100 psi	100	Not Rated	1 1/2"	3 3/8"	3/32"	3/64"	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	000000
1/2"	100 in.-lbs. @ 100 psi	100	Not Rated	2"	3 5/8"	1/8"	1/16"	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	000000
5/8"	300 in.-lbs. @ 100 psi	100	Not Rated	2 3/4"	3 5/8"	3/16"	3/32"	Clockwise and Counterclockwise	10-32	UNF	Female	0000000	000000

Torque-Limiting Shaft Couplings

For Round Shafts

For Keyed Shafts

For technical drawings and 3-D models, click on a part number.

					Keyway
For Shaft Dia.	Max. Torque	Max. Speed, rpm	OD	Overall Lg.	Wd.	Dp.	Torque-Limiting Direction		Each
For Round Shafts
1/4"	16 in.-lbs. @ 50 rpm	50	1"	1 1/2"	__	__	Clockwise and Counterclockwise	0000000	0000000
3/8"	16 in.-lbs. @ 50 rpm	50	1"	1 1/2"	__	__	Clockwise and Counterclockwise	0000000	000000
3/8"	25 in.-lbs. @ 50 rpm	50	1 3/8"	2 1/2"	__	__	Clockwise and Counterclockwise	0000000	000000
1/2"	25 in.-lbs. @ 50 rpm	50	1 3/8"	2 1/2"	__	__	Clockwise and Counterclockwise	0000000	000000
1/2"	50 in.-lbs. @ 50 rpm	50	1 5/8"	2 1/2"	__	__	Clockwise and Counterclockwise	0000000	000000
1/2"	75 in.-lbs. @ 50 rpm	50	2 1/4"	2 1/2"	__	__	Clockwise and Counterclockwise	0000000	000000
5/8"	50 in.-lbs. @ 50 rpm	50	1 5/8"	2 1/2"	__	__	Clockwise and Counterclockwise	0000000	000000
5/8"	75 in.-lbs. @ 50 rpm	50	2 1/4"	2 1/2"	__	__	Clockwise and Counterclockwise	0000000	000000
For Keyed Shafts
1/4"	16 in.-lbs. @ 50 rpm	50	1"	1 1/2"	1/16"	1/32"	Clockwise and Counterclockwise	0000000	000000
3/8"	25 in.-lbs. @ 50 rpm	50	1 3/8"	2 1/2"	3/32"	3/64"	Clockwise and Counterclockwise	0000000	000000
1/2"	50 in.-lbs. @ 50 rpm	50	1 5/8"	2 1/2"	1/8"	1/16"	Clockwise and Counterclockwise	0000000	000000
1/2"	75 in.-lbs. @ 50 rpm	50	2 1/4"	2 1/2"	1/8"	1/16"	Clockwise and Counterclockwise	0000000	000000