3/8" Shaft Diameter Torque Limiters

Filter by

System of Measurement

Shaft Diameter

Shaft Type

Maximum Torque

Less than 1,000 in·lbf

Torque

0.18 in·lbf to 5 in·lbf

0.5 in·lbf to 10.6 in·lbf

1 in·lbf to 25 in·lbf

1.6 in·lbf to 16 in·lbf

2 in·lbf to 50 in·lbf

2.5 in·lbf to 25 in·lbf

4 in·lbf to 60 in·lbf

5 in·lbf

80 in·ozf to 800 in·ozf

9 in·lbf to 25 in·lbf

18 in·lbf to 39 in·lbf

18 in·lbf to 50 in·lbf

2 ft·lbf to 12 ft·lbf

45 in·lbf to 130 in·lbf

Drive Type

Construction

Maximum Rotation Speed

Engagement Type

Shaft Mount Type

Thread Size

For Shaft Misalignment Type

Overall Length

Drive Direction

Clockwise and Counterclockwise

Material

Length

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

REACH

RoHS

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Exempt

Rotation Speed

Less than 1,000 rpm

1,000 rpm to 1,999 rpm

4,000 rpm to 5,999 rpm

6,000 rpm or greater

Torque Adjustment Mechanism

Air

Manual

Mounting Hole Thread Size

4-40

6-32

Shaft Coupling Flexibility

49 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



	0.18 to 5	300	2 3/4"	2 7/16"	Clockwise and Counterclockwise	Set Screw	M4 × 0.7 mm	3/8"	7220K4	0000000


	0.5 to 10.6	220	3 5/16"	2 1/2"	Clockwise and Counterclockwise	Set Screw	M5 × 0.8 mm	3/8"	7220K5	000000
	1 to 25	250	4 11/16"	3 1/8"	Clockwise and Counterclockwise	Set Screw	M5 × 0.8 mm	3/8"	7220K6	000000
	2 to 50	200	5 1/4"	3 1/8"	Clockwise and Counterclockwise	Set Screw	M5 × 0.8 mm	3/8"	7220K7	000000

Friction Torque Limiters

Use friction to prevent torque overload, control tension, and brake. These torque limiters slip when there’s too much torque while still transmitting 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. They have an adjustment ring, so you can set the torque limit by hand without removing them from your shaft. Fasten them to your shaft by tightening the set screws, which bite into the shaft to hold it.

Shaft-to-Shaft

Image of Product. Front orientation. Torque Limiters. Friction Torque Limiters.

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

						Keyway
	For Shaft Dia.	Torque, in·lbf	Max. Rotation Speed, rpm	OD	Overall Lg.	Wd.	Dp.	Drive Direction	Shaft Mount Type		Each
For Round Shafts



		3/8"	1.6 to 16	50	1"	1 1/2"	—	—	Clockwise and Counterclockwise	Set Screw	9132K13	0000000


		3/8"	2.5 to 25	50	1 3/8"	2 1/2"	—	—	Clockwise and Counterclockwise	Set Screw	9132K15	000000


		For Keyed Shafts



				3/8"	2.5 to 25	50	1 3/8"	2 1/2"	3/32"	3/64"	Clockwise and Counterclockwise	Set Screw	9132K52	000000

Through Shaft

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

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



	3/8"	1.6 to 16	50	1"	1 1/2"	Clockwise and Counterclockwise	Set Screw	4-40	9132K32	0000000


	3/8"	2.5 to 25	50	1 3/8"	2 1/2"	Clockwise and Counterclockwise	Set Screw	6-32	9132K33	000000

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
																Misalignment Capability
	For Shaft Dia.	Torque, in·lbf	OD	Overall Lg.	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 Round Shafts



		3/8"	9 to 25	1 3/8"	2"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N12	0000000	1/4", 3/8", 1/2"	4404N25	000000	15,000	0.003"	1°	0 to 180	4404N24	000000


		3/8"	18 to 50	1 3/4"	2 3/8"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N13	000000	1/4", 3/8", 1/2", 5/8"	4404N26	00000	10,000	0.011"	1°	0 to 180	9939T11	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.

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



	3/8"	18 to 39	9,000	1 9/16"	1 1/4"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N33	0000000


	3/8"	45 to 130	8,000	2 3/16"	1 9/16"	Steel	Clockwise and Counterclockwise	Clamp On	Single	Sensor Ring, Zero Backlash	4404N35	000000

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



		3/8"	1 5/16"	1 3/8"	3/32"	3/64"	11/32"	1/8"	1	6	Steel	6524K173	000000	25, 35, 40, 41, 50	6525K27	000000	6525K68	000000


		3/8"	2 1/4"	2"	3/32"	3/64"	1/2"	1/8"	5	35	Steel	6524K111	000000	35, 40, 41, 50	6525K11	00000	6525K62	00000


		Double Spring



				3/8"	1 5/16"	1 3/8"	3/32"	3/64"	5/16"	1/8"	2	12	Steel	6524K333	000000	25, 35, 40, 41, 50	6525K27	00000	6525K68	00000


				3/8"	2 1/4"	2"	3/32"	3/64"	15/32"	1/8"	7	50	Steel	6524K411	000000	35, 40, 41, 50	6525K11	00000	6525K62	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
5/16" × 3/8"	5	10,000	0.031"	2°	1"	1 3/4"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K55	000000
3/8" × 3/8"	5	10,000	0.031"	2°	1"	1 3/4"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K2	00000
3/8" × 3/8"	13	10,000	0.031"	2°	1 3/8"	2 1/4"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K41	00000
3/8" × 1/2"	10	10,000	0.031"	2°	1 1/4"	2 1/8"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K57	00000
3/8" × 1/2"	13	10,000	0.031"	2°	1 3/8"	2 1/4"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K58	00000
3/8" × 5/8"	13	10,000	0.031"	2°	1 3/8"	2 1/4"	Steel	Neoprene	-30 to 212	Clockwise and Counterclockwise	6410K59	00000

Remote-Adjust Air-Powered Friction Torque Limiters

Use your air system to remotely make changes to the torque setting or cut off torque completely, even during operation. Adjust the torque setting by adjusting the air pressure—the higher the pressure, the higher the set torque. When these torque limiters exceed their set torque, they’ll slip but still transmit the set torque. They use friction to prevent torque overload, control tension, and brake. They’re often used in automated systems. For instance, they can be used in a machine that tightens a bottle cap to a certain torque without overtightening it and breaking the bottle. Because they rely on friction, exposing them to moisture, oil, or lubricants can affect their performance.

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.

									Air Inlet
	For Shaft Dia.	Torque, in·lbf	Max. Pressure, psi	Max. Rotation Speed	OD	Overall Lg.	Drive Direction	Shaft Mount Type	Thread Size	Thread Type	Gender		Each
For Round Shafts



		3/8"	5 to 50	100	Not Rated	1 1/2"	3 3/8"	Clockwise and Counterclockwise	Set Screw	10-32	UNF	Female	9133K12	0000000

Through Shaft

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

										Air Inlet
	For Shaft Dia.	Torque, in·lbf	Max. Pressure, psi	Max. Rotation Speed	OD	Overall Lg.	Drive Direction	Shaft Mount Type	Mounting Hole Thread Size	Thread Size	Thread Type	Gender		Each
For Round Shafts



		3/8"	5 to 50	100	Not Rated	1 1/2"	3 3/8"	Clockwise and Counterclockwise	Set Screw	6-32	10-32	UNF	Female	9133K32	0000000

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



		3/8"	4 to 60	1,800	0.01"	1°	2 1/2"	2 1/2"	4	Nylon	Clockwise and Counterclockwise	Set Screw	Multiple	Sensor Ring	4410N102	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
2 1/2"	4	40 to 125	Stainless Steel	4410N116	000000
2 1/2"	4	100 to 150	Stainless Steel	4410N117	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.

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



	3/8"	4 to 60	1,800	2 1/2"	2 1/2"	4	Nylon	Clockwise and Counterclockwise	Set Screw	Multiple	Sensor Ring	4410N109	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
2 1/2"	4	40 to 125	Stainless Steel	4410N116	000000
2 1/2"	4	100 to 150	Stainless Steel	4410N117	00000

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



		3/8"	Keyed	1.25	5,000	1 3/16"	1"	Steel	3/32" × 3/64"	Set Screw	9/16"	3/8"	4550N43	0000000	4550N44	0000000

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



		3/8"	Keyed	14	1,800	2"	2 1/8"	Steel	3/32" × 3/64"	Slip Fit	1 1/4"	1"	3/16" × 3/32"	4550N12	0000000

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



		3/8"	Round	75	1,400	1 3/4"	1 1/2"	Power On	Hardwire	Spring Pin	18"	24	0.14	5156T43	0000000	0.24	5156T23	0000000