Safety Couplings | McMaster-Carr

	System of Measurement System of Measurement

Inch

Metric

	For Shaft Diameter For Shaft Diameter

	Maximum Torque Maximum Torque

	For Shaft Type For Shaft Type

	Round
	Keyed

	For Shaft Misalignment Type For Shaft Misalignment Type


Angular	Parallel

None

	Maximum Speed Maximum Speed

	Shaft Mount Type Shaft Mount Type

Set Screw

Spring Pin

	Torque Adjustability Torque Adjustability

Adjustable

Fixed

	Overall Length Overall Length

	OD OD

	Torque-Limiting Mechanism Torque-Limiting Mechanism

Disengages

Shears

Brake

	Construction Construction

One Piece

Multipiece

Two Piece

	Shaft Coupling Type Shaft Coupling Type

Flexible

Rigid

	Torque-Limiting Direction Torque-Limiting Direction

Clockwise and
Counterclockwise

Clockwise

Counterclockwise

	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

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

REACH Compliant

	Keyway Width Keyway Width

	Material Material

Aluminum

Steel

	Number of Set Screws Included Number of Set Screws Included

	Parallel Misalignment Capability Parallel Misalignment Capability

0.01"

0.031"

	Keyway Depth Keyway Depth

	Angular Misalignment Capability Angular Misalignment Capability

123 Products

Torque-Limiting Shaft-to-Shaft Couplings

Torque-Limiting Flexible Shaft Couplings

Protect shafts, motors, and gear boxes from damage that’s caused by torque overload from machine jams and emergency stops.

Torque-Limiting Flexible Shaft Couplings with Alarm

If they exceed maximum torque, these couplings disengage, sound an alarm, and then automatically re-engage once the overtorque condition is eliminated.

Connection-Severing Flexible Shaft 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.

Air-Powered Torque-Limiting Shaft Couplings

Often used in automated systems, these couplings are air actuated so you can adjust the torque during operation.

Torque-Limiting Shaft Couplings

Adjust your system's torque limit by hand.

Torque-Limiting Shaft-to-Gear Couplings

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.

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

Also known as hysteresis clutches, these couplings use magnetic force to brake, control tension, and prevent torque overload. They have a shaft on one end for connecting to other components.

Torque-Limiting Shaft-to-Gear Couplings

Adjust your system's torque limit by hand.

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

Often used in automated systems, these couplings are both air actuated and remotely adjustable, so you can adjust the torque setting even during operation.

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.

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.

Torque-Limiting Shaft-to-Shaft Couplings

Torque-Limiting Flexible Shaft Couplings

Torque-Limiting Flexible Shaft Couplings with Alarm

Connection-Severing Flexible Shaft Couplings

Air-Powered Torque-Limiting Shaft Couplings

Torque-Limiting Shaft Couplings

Torque-Limiting Shaft-to-Gear Couplings

Magnetic Torque-Limiting Shaft-to-Gear Couplings

Magnetic Torque-LimitingShaft-to-Gear Couplings with Shaft

Torque-Limiting Shaft-to-Gear Couplings

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

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

Electromagnetic Torque-LimitingShaft-to-Gear Couplings

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

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

Electromagnetic Torque-Limiting
Shaft-to-Gear Couplings