7/8" 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

Torque

1 in·lbf to 25 in·lbf

2 in·lbf to 50 in·lbf

3 in·lbf to 70 in·lbf

11 ft·lbf to 100 ft·lbf

13 ft·lbf to 175 ft·lbf

25 ft·lbf to 60 ft·lbf

Drive Type

Engagement Type

Construction

Material

Maximum Rotation Speed

Drive Direction

Clockwise and Counterclockwise

Torque Limiter Type

Overall Length

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

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

RoHS

Compliant with Exemptions

Not Compliant

Shaft Mount Type

Set Screw

For Shaft Misalignment Type

Keyway Width

Length

Performance

Rotation Speed

1,000 rpm to 1,999 rpm

Torque Adjustment Mechanism

32 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	7/8"	7220K6	0000000


	2 to 50	200	5 1/4"	3 1/8"	Clockwise and Counterclockwise	Set Screw	M5 × 0.8 mm	7/8"	7220K7	000000
	3 to 70	200	6 5/16"	4 1/8"	Clockwise and Counterclockwise	Set Screw	1/4"-20	7/8"	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



		7/8"	2 1/2"	1 3/4"	3/16"	3/32"	11/32"	1/8"	25	60	Steel	6524K124	000000	35, 40, 41, 50	6525K12	000000	6525K64	00000


		7/8"	3 3/8"	2 1/8"	3/16"	3/32"	1/2"	1/8"	11	100	Steel	6524K29	000000	35, 40, 41, 50	6525K13	00000	6525K63	00000
		7/8"	3 1/2"	2 3/16"	3/16"	3/32"	1/2"	1/8"	50	120	Steel	6524K142	000000	35, 40, 41, 50, 60	6525K14	00000	6525K65	00000


		Double Spring



				7/8"	2 1/2"	1 3/4"	3/16"	3/32"	11/32"	1/8"	30	95	Steel	6524K424	000000	35, 40, 41, 50	6525K12	00000	6525K64	0000


				7/8"	3 3/8"	2 1/8"	3/16"	3/32"	7/16"	1/8"	13	175	Steel	6524K434	000000	35, 40, 41, 50	6525K13	00000	6525K63	00000
				7/8"	3 1/2"	2 3/16"	3/16"	3/32"	1/2"	1/8"	60	190	Steel	6524K442	000000	35, 40, 41, 50, 60	6525K14	00000	6525K65	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

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
7/8"	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	6609K14	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

Base-Mount AC Brake Motors

Unlike standard AC motors, these motors have an integrated brake that activates after a power loss to hold your equipment in place. They’re often used with conveyors to stop them from moving backwards after a power loss, and with hoists to prevent them from dropping a load. Mount their base to flat surfaces. Rated for continuous duty, these motors can run equipment that never turns off. Their shaft is keyed, and they come with key stock.

Totally Enclosed Fan-Cooled (TEFC) Motor Enclosure—These motors have a TEFC (totally enclosed fan-cooled) enclosure that protects better than an ODP (open dripproof) enclosure. They aren’t airtight, but they can be used in dirty, dusty, and wet environments. To keep the motor cool, the enclosure has an external fan that blows air over the outside of the motor.

						Overall			Shaft					Insulation
	Power, hp	Max. Rotation Speed, rpm	Full Load Current	Inverter Rated	Motor Enclosure Type	Lg.	Wd.	Ht.	Dia.	Lg.	Ctr. to Base	Type	Base Type	Class	Max. Temp., ° F	Enclosure Rating		Each
230V AC/460V AC, Three Phase







				NEMA 145T

				1 1/2	1,750	4.4 amp/2.2 amp	No	Totally Enclosed Fan-Cooled (TEFC)	18 1/8"	9 1/8"	6 3/4"	7/8"	2 1/4"	3 1/2"	Keyed	Welded	B	266	IP43	4952N13	000000000




						NEMA 145

						2	1,740	5.8 amp/2.9 amp	Yes	Totally Enclosed Fan-Cooled (TEFC)	18 5/8"	9 1/8"	7 3/4"	7/8"	2 1/4"	3 1/2"	Keyed	Welded	F	311	IP43	4952N14	00000000

Base/Face-Mount AC Brake Motors

When these motors lose power, a brake engages to hold your equipment’s position, unlike standard AC motors. They’re often used with conveyors to keep items in place after a power loss, and with hoists to stop them from dropping a load. Mount them from the base or face. Rated for continuous duty, these motors can run equipment that never turns off. Their shaft is keyed, and they come with key stock.

						Overall			Shaft					Insulation
	Power, hp	Max. Rotation Speed, rpm	Full Load Current	Inverter Rated	Motor Enclosure Type	Lg.	Wd.	Ht.	Dia.	Lg.	Ctr. to Base	Type	Base Type	Class	Max. Temp., ° F	Enclosure Rating		Each
230V AC/460V AC, Three Phase







				NEMA 145TC

				1 1/2	1,750	4.8 amp/2.4 amp	Yes	Totally Enclosed Fan-Cooled (TEFC)	18 1/8"	8 7/8"	7 1/4"	7/8"	2 1/4"	3 1/2"	Keyed	Welded	B	266	IP43	4954N13	000000000


				2	1,740	5.8 amp/2.9 amp	Yes	Totally Enclosed Fan-Cooled (TEFC)	18 5/8"	8 7/8"	7 1/4"	7/8"	2 1/4"	3 1/2"	Keyed	Welded	F	311	IP43	4954N14	00000000

Face-Mount AC Brake Motors

A built-in brake engages to hold your equipment in place when these motors lose power, unlike standard AC motors. These motors are often used with conveyors to keep items in place after a power loss, and with hoists to prevent them from dropping a load. Also known as C-face motors, these bolt directly to your equipment. They’re rated for continuous duty, so they can run equipment that never turns off. Their shaft is keyed, and they come with a key stock.

Totally Enclosed Fan-Cooled (TEFC) Motor Enclosure—These motors have a TEFC (totally enclosed fan-cooled) enclosure that protects better than an ODP (open dripproof) enclosure. They’re not airtight, but they can be used in dirty, wet, and dusty environments. To keep the motor cool, the enclosure has an external fan that blows air over the outside of the motor.

						Overall			Shaft				Insulation
	Power, hp	Max. Rotation Speed, rpm	Full Load Current	Inverter Rated	Motor Enclosure Type	Lg.	Wd.	Ht.	Dia.	Lg.	Ctr. to Base	Type	Class	Max. Temp., ° F	Enclosure Rating		Each
230V AC/460V AC, Three Phase







				NEMA 145TC

				1 1/2	1,750	4.8 amp/2.4 amp	Yes	Totally Enclosed Fan-Cooled (TEFC)	18 5/8"	8 7/8"	7 1/4"	7/8"	2"	3 1/2"	Keyed	F	311	IP43	4876N13	000000000


				2	1,740	5.8 amp/2.9 amp	Yes	Totally Enclosed Fan-Cooled (TEFC)	18 3/4"	8 7/8"	7 1/4"	7/8"	2"	3 1/2"	Keyed	F	311	IP43	4876N14	00000000