3/4" Shaft Diameter Torque Limiters

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System of Measurement

Shaft Diameter

Shaft Type

Maximum Torque

Less than 1,000 in·lbf

1,000 in·lbf to 1,999 in·lbf

2,000 in·lbf to 2,999 in·lbf

3,000 in·lbf to 9,999 in·lbf

Torque

0 in·lbf to 300 in·lbf

0 in·lbf to 600 in·lbf

1 in·lbf to 25 in·lbf

2 in·lbf to 50 in·lbf

3 in·lbf to 70 in·lbf

20 in·lbf

25 in·lbf

40 in·lbf

40 in·lbf to 150 in·lbf

50 in·lbf

5 ft·lbf to 35 ft·lbf

75 in·lbf

7 ft·lbf to 50 ft·lbf

90 in·lbf to 220 in·lbf

90 in·lbf to 265 in·lbf

100 in·lbf

125 in·lbf

11 ft·lbf to 100 ft·lbf

Drive Type

Construction

Material

Maximum Rotation Speed

Engagement Type

Torque Limiter Type

Shaft Mount Type

Torque Adjustment Mechanism

Keyway Width

Overall Length

Drive Direction

Clockwise and Counterclockwise

Clockwise or Counterclockwise

Counterclockwise

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

Export Control Classification Number (ECCN)

EAR99

RoHS

Compliant

Not Compliant

For Shaft Misalignment Type

DFARS Specialty Metals

REACH

Length

Width

Performance

73 Products

Noncontact Magnetic Torque Limiters

Using magnetic force instead of friction to transmit torque, these torque limiters won't wear when they slip. Because there's no wear, they give you accurate, repeatable action. Also known as hysteresis clutches, use them to brake, control tension, and prevent torque overload. They are designed to slip during a torque overload while still transmitting the set torque. For example, you can use them to maintain a constant tension while winding and unwinding wire. All are through-shaft torque limiters, so they regulate torque transmission between an input shaft and a mounted component, such as a pulley, sprocket, or gear. Twist the adjustment ring to set the torque limit, then lock the ring into place with the included set screw.

Through Shaft

	Max. Rotation Speed, rpm	OD	Overall Lg.	Drive Direction	Shaft Mount Type	Mounting Hole Thread Size	For Shaft Dia.		Each
For Round Shafts



	1 to 25	250	4 11/16"	3 1/8"	Clockwise and Counterclockwise	Set Screw	M5 × 0.8 mm	3/4"	7220K6	0000000


	2 to 50	200	5 1/4"	3 1/8"	Clockwise and Counterclockwise	Set Screw	M5 × 0.8 mm	3/4"	7220K7	000000
	3 to 70	200	6 5/16"	4 1/8"	Clockwise and Counterclockwise	Set Screw	1/4"-20	3/4"	7220K8	00000000

Chain and Belt Torque Limiters


Torque Limiter Shown with Sprocket		Replacement Friction Lining

Prevent damage from overloading. When overloaded, these limiters cause your sprocket or pulley to slip. Once the overload is removed, the limiters automatically reset. Set the torque within the range listed. Friction lining is between the hub and pressure plate.

Double Spring—Double-spring limiters have a second spring for handling nearly twice the torque of single-spring limiters.

Sprockets—Sprockets are designed specifically to fit their corresponding limiters. These hubless sprockets are not interchangeable.

	Torque Limiters												Sprockets			Replacement Friction Lining
				Keyway				Torque, ft·lbf
	For Shaft Dia.	OD	Overall Wd.	Wd.	Dp.	For Max. Sprocket or Pulley Wd.	Friction Lining Thk.	Min.	Max.	Hub Material		Each	Choose a Roller Chain Trade Number		Each		Each
Single Spring



		3/4"	2 1/4"	2"	3/16"	3/32"	1/2"	1/8"	5	35	Steel	6524K21	0000000	35, 40, 41, 50	6525K11	000000	6525K62	000000


		3/4"	2 1/2"	1 3/4"	3/16"	3/32"	11/32"	1/8"	25	60	Steel	6524K123	00000	35, 40, 41, 50	6525K12	00000	6525K64	0000
		3/4"	3 3/8"	2 1/8"	3/16"	3/32"	1/2"	1/8"	11	100	Steel	6524K28	000000	35, 40, 41, 50	6525K13	00000	6525K63	00000
		3/4"	3 1/2"	2 3/16"	3/16"	3/32"	1/2"	1/8"	50	120	Steel	6524K141	000000	35, 40, 41, 50, 60	6525K14	00000	6525K65	00000
		3/4"	4 1/2"	2 7/8"	3/16"	3/32"	7/8"	1/8"	18	190	Steel	6524K321	000000	35, 40, 41, 50, 60, 80, 100	6525K32	00000	6525K72	00000


		Double Spring



				3/4"	2 1/4"	2"	3/16"	3/32"	15/32"	1/8"	7	50	Steel	6524K25	000000	35, 40, 41, 50	6525K11	00000	6525K62	00000


				3/4"	2 1/2"	1 3/4"	3/16"	3/32"	11/32"	1/8"	30	95	Steel	6524K423	000000	35, 40, 41, 50	6525K12	00000	6525K64	0000
				3/4"	3 3/8"	2 1/8"	3/16"	3/32"	7/16"	1/8"	13	175	Steel	6524K34	000000	35, 40, 41, 50	6525K13	00000	6525K63	00000
				3/4"	3 1/2"	2 3/16"	3/16"	3/32"	1/2"	1/8"	60	190	Steel	6524K441	000000	35, 40, 41, 50, 60	6525K14	00000	6525K65	00000
				3/4"	4 1/2"	2 7/8"	3/16"	3/32"	13/16"	1/8"	20	285	Steel	6524K381	000000	35, 40, 41, 50, 60, 80, 100	6525K32	00000	6525K72	00000

Replacements for Chain and Belt Torque Limiters

	For Roller Chain Trade No.
For 2 1/2" OD


35	6525K804	00000
40, 50	6525K805	0000
41	6525K806	0000

For 3 1/2" OD


35	6525K807	0000
40, 50	6525K808	0000
41	6525K809	0000
60	6525K81	0000

For OD		Each
2 1/2"	6525K801	00000
3 1/2"	6525K802	00000

Precision Overload-Protection Spring-Loaded Torque Limiters

With zero backlash (no play), there’s no motion lost when these torque limiters transfer torque, so machines move smoothly with accurate and repeatable motion. They protect your machinery if there is a jam, emergency stop, or other overload by cutting off torque when a maximum torque is reached. They automatically resume transmitting torque once it drops below the set maximum. When they resume, they start transmitting torque from the same position where they stopped, keeping your drive and output sides in sync. They should not be used in applications that frequently exceed the set torque. You can adjust the set torque by using a spanner wrench to twist the adjustment ring.

To help you detect an overload, they have a sensor ring that moves out of place when these limiters cut off torque. Use a sensor (not included) to trigger an alarm or a shutdown when the ring moves.

They clamp evenly around your shaft for more holding power than set screws and won't damage your shaft.

Shaft-to-Shaft

Shaft-to-Shaft Torque

Limiter, Spider, and

Hub Shown Assembled


	Hubs

Hubs

Shaft-to-shaft torque limiters also act as a flexible shaft coupling, so they compensate for angular and parallel misalignment as they regulate torque transmission between shafts. This reduces vibration and protects components from wear. For a complete unit, you’ll need a torque limiter, a hub, and a spider (all sold separately).

	Torque Limiters													Hubs			Spiders
					Keyway													Misalignment Capability
	For Shaft Dia.	Torque, in·lbf	OD	Overall Lg.	Wd.	Dp.	Material	Drive Direction	Shaft Mount Type	Re-Engagement Position	Features		Each	Choose a Shaft Diameter		Each	Max. Rotation Speed, rpm	Parallel	Angular	Temp. Range, ° F		Each
For Keyed Shafts



		3/4"	90 to 220	2 9/16"	3 3/8"	3/16"	3/32"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N17	0000000	1/2", 5/8", 3/4"	4404N27	000000	9,000	0.011"	1°	0 to 180	9939T14	000000


		3/4"	225 to 705	2 7/8"	3 13/16"	3/16"	3/32"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N19	000000	1/2", 5/8", 3/4", 1", 1 1/4"	4404N28	000000	8,000	0.011"	1°	0 to 180	9939T17	00000

Through Shaft

Through-shaft torque limiters regulate torque transmission between an input shaft and a mounted component, such as a pulley, sprocket, or gear.

						Keyway
	For Shaft Dia.	Torque, in·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Wd.	Dp.	Material	Drive Direction	Shaft Mount Type	Re-Engagement Position	Features		Each
For Keyed Shafts



		3/4"	90 to 265	6,000	2 9/16"	2"	3/16"	3/32"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N38	0000000


		3/4"	225 to 705	6,000	2 7/8"	2 1/8"	3/16"	3/32"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N39	000000

Overload-Protection Spring-Loaded Torque Limiters

Protect your machinery if there is a jam, emergency stop, or other overload by cutting off torque between shafts when a maximum torque is reached. These torque limiters automatically resume transmitting torque once it drops below the set maximum. They should not be used in applications that frequently exceed the maximum torque. Since they come factory-set to a maximum torque, there’s no adjustment required and no risk of unintended changes to the torque setting.

They act as a flexible shaft coupling, so they reduce vibration and protect components from wear by compensating for angular and parallel misalignment. Fasten to your shafts by tightening the set screws, which bite into each shaft to hold it.

			Misalignment Capability
For Shaft Dia.	For Shaft Type	Max. Rotation Speed, rpm	Parallel	Angular	OD	Overall Lg.	Keyway Wd. × Keyway Dp.	Material	Center Material	Drive Direction	Re-Engagement Position	Choose a Maximum Torque, in·lbf		Each
3/4"	Keyed	1,800	0.031"	6°	3 1/2"	3"	3/16" × 3/32"	6061 Aluminum	Steel	Clockwise and Counterclockwise	Multiple	25, 50, 75, 100, 125	6609K13	0000000

Torque Limiter Sensor Rings


Torque Limiter with Sensor Ring Installed

Sensor rings help you detect an overload by moving only when the limiter is transmitting torque. Use a sensor (not included) to trigger an alarm or shut down when the ring stops moving.

Material	OD	Thk.		Each
Steel	3 1/2"	0.06"	6609K1	000000

High-Torque Friction Torque Limiters

With rugged roller chains, these torque limiters handle more torque than other torque limiters. They have a disc that creates friction to prevent torque overload, control tension, and brake. If there’s too much torque, they’ll slip and only transmit the set torque. For example, they could be used in a machine that tightens a bottle cap to a certain torque without overtightening and breaking the bottle. Because they rely on friction, exposing them to moisture, oil, or lubricants can affect their performance. You can adjust the torque by rotating the hex nut on the hub.

They act as a flexible shaft coupling, so they reduce vibration and protect components from wear by compensating for angular and parallel misalignment. Fasten them to your shafts by tightening the set screws, which bite into each shaft to hold it.

Shaft-to-Shaft

Single Spring—Single-spring torque limiters let you make finer torque adjustments than double-spring torque limiters but can only withstand half as much torque.

Double Spring—Double-spring torque limiters handle twice as much torque as single-spring torque limiters but are not the best for making precise adjustments at low torques.

					Misalignment Capability							Roller Chain
	For Shaft Dia.	For Shaft Type	Torque, ft·lbf	Max. Rotation Speed, rpm	Parallel	Angular	OD	Overall Lg.	Keyway Wd. × Keyway Dp.	Drive Direction	Shaft Mount Type	Standard	Trade No.		Each
Single Spring



		1/2" × 3/4"	Round × Keyed	0 to 25	1,800	0.01"	3°	2 3/4"	2 1/4"	3/16" × 3/32"	Clockwise and Counterclockwise	Set Screw	ANSI	35-2	4782N115	0000000


		5/8" × 3/4"	Keyed × Keyed	0 to 25	1,800	0.01"	3°	2 3/4"	2 1/4"	3/16" × 3/32" 3/16" × 3/32"	Clockwise and Counterclockwise	Set Screw	ANSI	35-2	4782N119	000000
		3/4" × 3/4"	Keyed × Keyed	0 to 25	1,800	0.01"	3°	2 3/4"	2 1/4"	3/16" × 3/32" 3/16" × 3/32"	Clockwise and Counterclockwise	Set Screw	ANSI	35-2	4782N122	000000


		Double Spring



				1/2" × 3/4"	Round × Keyed	0 to 50	1,800	0.01"	3°	2 3/4"	2 1/4"	3/16" × 3/32"	Clockwise and Counterclockwise	Set Screw	ANSI	35-2	4782N116	000000


				5/8" × 3/4"	Keyed × Keyed	0 to 50	1,800	0.01"	3°	2 3/4"	2 1/4"	3/16" × 3/32" 3/16" × 3/32"	Clockwise and Counterclockwise	Set Screw	ANSI	35-2	4782N121	000000
				3/4" × 3/4"	Keyed × Keyed	0 to 50	1,800	0.01"	3°	2 3/4"	2 1/4"	3/16" × 3/32" 3/16" × 3/32"	Clockwise and Counterclockwise	Set Screw	ANSI	35-2	4782N123	000000

Corrosion-Resistant Overload-Protection Spring-Loaded Torque Limiters

Prevent corrosion from interfering with these torque limiters’ ability to protect your machinery if there’s a jam, emergency stop, or other overload. Made of nylon, they won’t rust or corrode from moisture, salt, and oil. They cut off torque when they reach the set maximum torque and automatically resume transmitting torque once it drops below the set maximum. They should not be used in applications that frequently exceed the set torque. You can adjust the set torque by tightening the hex head screw on the housing.

To help you detect an overload, these torque limiters have a sensor ring that moves out of place when these limiters cut off torque. Use a sensor (not included) to trigger an alarm or a shutdown when the ring moves.

Fasten them to your shaft by tightening the set screws, which bite into the shaft to hold it.

Shaft-to-Shaft

Shaft-to-shaft torque limiters also act as a shaft coupling, allowing you to regulate torque transmission between two shafts.

				Misalignment Capability				Keyway
	For Shaft Dia.	Torque, in·lbf	Max. Rotation Speed, rpm	Parallel	Angular	OD	Overall Lg.	Wd.	Dp.	No. of Springs	Material	Drive Direction	Shaft Mount Type	Re-Engagement Position	Features		Each
For Keyed Shafts



		3/4"	40 to 150	1,800	0.01"	1°	4 1/32"	3 7/16"	3/16"	3/32"	6	Nylon	Clockwise and Counterclockwise	Set Screw	Multiple	Sensor Ring	4410N106	0000000

Spring Kits

Image of Product. Front orientation. Exploded view. Compression Springs. Corrosion-Resistant Overload-Protection Spring-Loaded Torque Limiters .

Spring kits let you change the torque range on your torque limiter.

For OD	No. of Springs	Torque, in·lbf	Material		Each
4 1/32"	6	140 to 350	Stainless Steel	4410N118	000000
4 1/32"	6	300 to 500	Stainless Steel	4410N119	00000

Through Shaft

Through-shaft torque limiters regulate torque transmission between an input shaft and a mounted component, such as a pulley, sprocket, or gear.

						Keyway
	For Shaft Dia.	Torque, in·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Wd.	Dp.	No. of Springs	Material	Drive Direction	Shaft Mount Type	Re-Engagement Position	Features		Each
For Keyed Shafts



		3/4"	40 to 150	1,800	4 1/32"	3 7/16"	3/16"	3/32"	6	Nylon	Clockwise and Counterclockwise	Set Screw	Multiple	Sensor Ring	4410N114	0000000

Spring Kits

Spring kits let you change the torque range on your torque limiter.

For OD	No. of Springs	Torque, in·lbf	Material		Each
4 1/32"	6	140 to 350	Stainless Steel	4410N118	000000
4 1/32"	6	300 to 500	Stainless Steel	4410N119	00000

Flexible-Shaft Shear Couplings

To protect power-transmission components from damage, these couplings will shear or tear in overtorque conditions (approximately 10-20 times the maximum rated torque) to sever connections between shafts. They have a flexible center that not only compensates for misalignment, but also dampens vibration and shock loads. Couplings have no metal-on-metal contact, reducing noise and eliminating the need for lubrication. Fasten to your shaft by tightening the set screws, which bite into the shaft to hold it.

			Misalignment Capability
For Shaft Diameter	Max. Torque, in·lbf	Max. Rotation Speed, rpm	Parallel	Angular	OD	Overall Lg.	Material	Center Material	Temp. Range, ° F	Torque-Limiting Direction		Each
1/2" × 3/4"	20	10,000	0.031"	2°	1 5/8"	2 1/2"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K63	0000000
1/2" × 3/4"	40	10,000	0.031"	2°	2"	2 7/8"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K65	000000

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—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



		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"	4550N15	0000000

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



		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"	4550N34	000000000	4550N33	000000000

Sprag Engagement—Flush 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 with a flush 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	4550N21	000000000	4550N201	0000000	4550N301	0000000

Soft-Start Centrifugal Clutches

Disengaged until they rotate fast enough to transmit torque, these clutches give the components on your driven side a smooth start by allowing the driving side to start without load.

Friction Engagement


Shaft-to-Shaft with Engagement Springs	Shaft-to-Shaft with Support Rollers	Through Shaft with Support Rollers and Pulley

Shaft-to-Shaft—Shaft-to-shaft clutches also act as a shaft coupling, allowing you to regulate torque transmission between two shafts.

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

Support Rollers—Clutches with support rollers are quieter and last longer than other centrifugal clutches because the contact points are supported by urethane rollers to prevent slipping.

With Pulley—Clutches with a pulley come ready to install a V-belt.

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

								Misalignment Capability							Clockwise-and-Counterclockwise Drive
	For Shaft Dia.	For Shaft Type	Engagement Speed, rpm	Max. Power, hp	Max. Rotation Speed, rpm	Pitch Dia.	For Belt Trade Size	Parallel	Angular	OD	Overall Lg.	Keyway Wd. × Keyway Dp.	Material	Shaft Mount Type		Each
Shaft-to-Shaft with Engagement Springs



		3/4"	Keyed	830	13	3,600	—	—	0.003"	0.25°	4 3/16"	2 1/2"	3/16" × 3/32"	Steel	Set Screw	4402N112	0000000


		Shaft-to-Shaft with Support Rollers



				3/4"	Keyed	1,100	7.5	1,750	—	—	—	—	3 63/64"	3 19/64"	3/16" × 3/32"	Steel	Set Screw	4402N131	000000


				Through Shaft with Support Rollers and Pulley



						3/4"	Keyed	1,100	7.5	1,750	2.8"	4L, A	—	—	3 63/64"	1 7/8"	3/16" × 3/32"	Steel	Set Screw	4402N142	000000


						3/4"	Keyed	1,100	7.5	1,750	3.3"	4L, A	—	—	3 63/64"	1 7/8"	3/16" × 3/32"	Steel	Set Screw	4402N152	000000

Clutch Engagement Springs

Clutch engagement springs allow you to change the speed at which the clutch engages.

Includes		Each
Four Green Springs (830 RPM Engagement), Four Red Springs (1200 RPM Engagement), Four Orange Springs (1800 RPM Engagement)	4402N11	000000