One Way Clutches | McMaster-Carr

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System of Measurement

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Shaft Type

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Maximum Torque

Less than 1,000 in·lbf

1,000 in·lbf to 9,999 in·lbf

10,000 in·lbf to 19,999 in·lbf

20,000 in·lbf to 29,999 in·lbf

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Roller Chain Trade Number

Material

Steel

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Less than 100 ft·lbf

100 ft·lbf to 199 ft·lbf

200 ft·lbf to 249 ft·lbf

250 ft·lbf to 999 ft·lbf

1,000 ft·lbf or greater

Number of Teeth

Engagement Type

Drive Type

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1,000 rpm to 1,999 rpm

2,000 rpm to 9,999 rpm

DFARS Specialty Metals

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Export Control Classification Number (ECCN)

REACH

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Width

Maximum Rotation Speed

Length

52 Products

One-Way Clutches

Since they transfer torque in one direction and spin freely in the other, these clutches are useful in applications where you don’t want motion to reverse, such as in backstopping, indexing, and overrunning. For example, they can be used to prevent a conveyor from reversing direction.

When choosing a clutch, consider how much torque you need to transfer. You should also consider how the clutch will attach to your mounted component.

Roller Engagement—Knurled Hub

Roller clutches are best for low- to medium-torque transfer in overrunning and indexing applications.

Clutches with a knurled hub can be press fit into the bore of your component.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Set-Screw Shaft Mount—Clutches that mount to shafts with set screws bite into your shaft when tightened to hold it.

								Shaft		Hub		Clockwise Drive		Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type	Dia.	Lg.		Each		Each
Through Shaft



		1/4"	Round	0.83	5,000	15/16"	31/32"	Steel	—	Set Screw	5/8"	9/32"	0000000	0000000	0000000	0000000


		3/8"	Keyed	1.25	5,000	1 3/16"	1"	Steel	3/32" × 3/64"	Set Screw	9/16"	3/8"	0000000	000000	0000000	000000
		1/2"	Keyed	4.16	2,000	1 1/2"	1 9/32"	Steel	1/8" × 1/16"	Set Screw	7/8"	1/2"	0000000	000000	0000000	000000

Roller Engagement—Keyed Hub

Roller clutches are best for low- to medium-torque transfer in overrunning and indexing applications.

Clutches with a keyed hub let you slip on your component.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Slip-Fit Shaft Mount—Clutches that mount to shafts with a slip fit must be secured with a shaft collar or in some other way that prevents them from moving along the length of your shaft.

								Shaft		Hub			Clockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type	Dia.	Lg.	Keyway Wd. × Keyway Dp.		Each
Through Shaft



		1/4"	Keyed	5	1,800	1 5/8"	1 15/16"	Steel	1/16" × 1/32"	Slip Fit	7/8"	13/16"	3/16" × 3/32"	0000000	0000000


		3/8"	Keyed	14	1,800	2"	2 1/8"	Steel	3/32" × 3/64"	Slip Fit	1 1/4"	1"	3/16" × 3/32"	0000000	000000
		1/2"	Keyed	14	1,800	2"	2 1/8"	Steel	1/8" × 1/16"	Slip Fit	1 1/4"	1"	3/16" × 3/32"	0000000	000000
		5/8"	Keyed	28	1,500	2 5/8"	2 23/32"	Steel	3/16" × 3/32"	Slip Fit	1 3/8"	1 5/16"	3/16" × 3/32"	0000000	000000
		3/4"	Keyed	100	1,000	3 5/8"	3 11/32"	Steel	3/16" × 3/32"	Slip Fit	2 1/4"	1 1/2"	3/8" × 3/16"	0000000	000000
		1"	Keyed	100	1,000	3 5/8"	3 11/32"	Steel	1/4" × 1/8"	Slip Fit	2 1/4"	1 1/2"	3/8" × 3/16"	0000000	000000
		1 1/4"	Keyed	100	1,000	3 5/8"	3 11/32"	Steel	1/4" × 1/8"	Slip Fit	2 1/4"	1 1/2"	3/8" × 3/16"	0000000	000000
		1 1/2"	Keyed	200	800	4 1/2"	4 1/2"	Steel	3/8" × 3/16"	Slip Fit	3"	2 1/16"	3/8" × 3/16"	0000000	000000

Sprag Engagement—Keyed Hub

Sprag clutches handle higher torque than roller clutches because they have more contact points. This makes them best for backstopping applications.

Clutches with a keyed hub let you slip on your component.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Set-Screw Shaft Mount—Clutches that mount to shafts with set screws bite into your shaft when tightened to hold it.

				Max. Rotation Speed, rpm					Shaft		Hub			Clockwise Drive		Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Inner-Race	Outer-Race	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type	Dia.	Lg.	Keyway Wd. × Keyway Dp.		Each		Each
Through Shaft



		5/8"	Keyed	110	1,950	900	2"	2 3/4"	Steel	3/16" × 3/32"	Set Screw	1 1/4"	1"	3/16" × 3/32"	0000000	000000000	0000000	000000000


		3/4"	Keyed	300	1,950	750	2.88"	3.19"	Steel	3/16" × 3/32"	Set Screw	1 3/8"	1 5/16"	3/16" × 3/32"	0000000	00000000	0000000	00000000
		1"	Keyed	450	1,650	600	3 1/4"	3.56"	Steel	1/4" × 1/8"	Set Screw	1 3/4"	1 7/16"	1/4" × 1/8"	0000000	00000000	0000000	00000000
		1 1/4"	Keyed	675	1,250	350	3 3/4"	3 1/2"	Steel	5/16" × 5/32"	Set Screw	2 1/4"	1 7/16"	5/16" × 5/32"	0000000	00000000	0000000	00000000

Sprag Engagement—Without Hub


	Covers


Torque Arm Shown Installed	Torque Arms

Sprag clutches handle higher torque than roller clutches because they have more contact points. This makes them best for backstopping applications.

Clutches without a hub have a precision ground outer race, so they can be press fit directly into a component and positioned anywhere along the length of your shaft. They also have mounting holes on their face you can use to secure your component or an anti-rotation device, such as a torque arm, for a different backstopping setup.

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

Slip-Fit Shaft Mount—Clutches that mount to shafts with a slip fit must be secured with a shaft collar or in some other way that prevents them from moving along the length of your shaft.

Covers—Covers protect you from rotating equipment when the clutch is mounted to the end of the shaft.

Torque Arms—Clutch torque arms work as an anchor for clutches in backstopping applications. Mount to the outer race of your clutch and a stationary piece of equipment.

	Clutches												Covers		Torque Arms
				Max. Rotation Speed, rpm					Shaft		Clockwise or Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, ft·lbf	Inner-Race	Outer-Race	OD	Overall Lg.	Material	Keyway Wd. × Keyway Dp.	Mount Type		Each		Each		Each
Through Shaft



		3/4"	Keyed	300	2,800	850	3 1/2"	2 3/4"	Steel	3/16" × 3/32"	Slip Fit	0000000	000000000	00000000	0000000	00000000	0000000


		1"	Keyed	1,175	2,500	800	4 1/4"	3 1/2"	Steel	1/4" × 1/8"	Slip Fit	0000000	00000000	00000000	000000	00000000	000000
		1 1/4"	Keyed	1,175	2,500	800	4 1/4"	3 1/2"	Steel	1/4" × 1/8"	Slip Fit	0000000	00000000	00000000	000000	00000000	000000
		1 1/2"	Keyed	2,250	2,200	750	5 3/8"	3 3/4"	Steel	3/8" × 3/16"	Slip Fit	0000000	00000000	00000000	000000	00000000	000000
		1 3/4"	Keyed	2,250	2,200	750	5 3/8"	3 3/4"	Steel	3/8" × 3/16"	Slip Fit	0000000	00000000	00000000	000000	00000000	000000

Electric One-Way Clutches

Unlike mechanical clutches, these clutches let you electrically control when torque is transmitted. They transfer torque in one direction and spin freely in the opposite direction, so they’re useful in applications where you don’t want motion to reverse such as in backstopping, indexing, and overrunning. When you remove power from these clutches, they disengage, cutting torque to your pulley, sprocket, gear, or other mounted component without stopping your drive shaft.

Friction Engagement

Through Shaft—Through-shaft clutches regulate torque transmission between an input shaft and a mounted component.

												Clockwise Drive			Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Max. Torque, in·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Electric Clutch Type	Electrical Connection Type	Shaft Mount Type	Wire Lead Lg.	Voltage, V DC	Current, amp		Each	Current, amp		Each
Through Shaft



		1/4"	Round	30	1,400	1 1/4"	1 1/8"	Power On	Hardwire	Spring Pin	15"	24	0.14	0000000	0000000	0.24	0000000	0000000


		5/16"	Round	30	1,400	1 1/4"	1 1/8"	Power On	Hardwire	Spring Pin	15"	24	0.14	0000000	000000	0.24	0000000	000000
		3/8"	Round	75	1,400	1 3/4"	1 1/2"	Power On	Hardwire	Spring Pin	18"	24	0.14	0000000	000000	0.24	0000000	000000
		1/2"	Round	75	1,400	1 3/4"	1 1/2"	Power On	Hardwire	Spring Pin	18"	24	0.14	0000000	000000	0.24	0000000	000000

One-Way-Locking Sprockets

Stop reverse motion in its tracks. These sprockets use a clutch to transfer torque in one direction and spin freely in the other. They're often used for backstopping, indexing, and overrunning. For example, in two-speed systems, they connect the low-speed motor to the main drive. When the high-speed motor takes over, they stop transferring power and spin in the opposite direction. All are made in the U.S.

Steel—Steel is strong, but best for dry environments since moisture will cause it to rust.

Finished Bore—Mount these sprockets onto your shaft and secure with a set screw—no machining required.

	For Roller Chain							Keyway
	Trade No.	Std.	Pitch	No. of Teeth	OD	Bore Type	For Shaft Dia.	Wd.	Dp.		Each
For Single Strand







				Steel

				35	ANSI	3/8"	15	1.99"	Finished	1/2"	1/8"	9/16"	0000000	0000000


				35	ANSI	3/8"	25	3.19"	Finished	5/8"	3/16"	23/32"	0000000	000000
				40	ANSI	1/2"	12	2.17"	Finished	1/2"	1/8"	9/16"	0000000	000000
				40	ANSI	1/2"	15	2.65"	Finished	1/2"	1/8"	9/16"	0000000	000000
				40	ANSI	1/2"	20	3.46"	Finished	3/4"	3/16"	27/32"	0000000	000000
				50	ANSI	5/8"	12	2.71"	Finished	1/2"	1/8"	9/16"	0000000	000000
				50	ANSI	5/8"	15	3.32"	Finished	3/4"	3/16"	27/32"	0000000	000000
				50	ANSI	5/8"	20	4.32"	Finished	1"	1/4"	1 3/32"	0000000	000000
				60	ANSI	3/4"	12	3.25"	Finished	5/8"	3/16"	23/32"	0000000	000000
				60	ANSI	3/4"	14	3.74"	Finished	3/4"	3/16"	27/32"	0000000	000000
				60	ANSI	3/4"	18	4.7"	Finished	1 1/4"	1/4"	1 3/8"	0000000	000000