Zero Backlash Couplings | McMaster-Carr

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System of Measurement

Shaft Diameter

Shaft Type

Overall Length

For Shaft Misalignment Type

Shaft Mount Type

Material

Unit Price

Construction

Maximum Torque

500 in·lbf to 999 in·lbf

1,000 in·lbf to 9,999 in·lbf

10,000 in·lbf to 29,999 in·lbf

30,000 in·lbf or greater

For Rotary Motion

Continuous

Forward/Reverse

Start/Stop

Shaft Coupling Flexibility

Flexible

Rigid

Flexible Shaft Coupling Cut Style

Parallel

Spiral

Clamping Screw Material

Stainless Steel

Steel

Number of Clamping Screws Included

Angular Misalignment Capability

REACH

DFARS Specialty Metals

Exempt

RoHS

Compliant

Not Compliant

Export Control Classification Number (ECCN)

1C998

EAR99

Parallel Misalignment Capability

Axial Misalignment Capability

Clamping Screw Type

Keyway Width

Set Screw Material

1,185 Products

About Shaft Couplings

Servomotor Precision Flexible Shaft Couplings

Able to handle high twisting forces as well as misalignment, these couplings are good for high-performance servomotor applications.

Clamping Precision Flexible Shaft Couplings

Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft.

Set Screw Precision Flexible Shaft Couplings

Tighten the set screws to fasten these couplings to your shaft. Set screws bite into the shaft to hold the couplings in place.

High-Speed Precision Flexible Shaft Couplings

With a bellows between two hubs, these couplings handle all types of misalignment and are good for precision stepper and encoder motion-control applications.

High-Speed Servomotor Precision
Flexible Shaft Couplings

Connect shafts and ball screws to high-speed servomotors and stepper motors—these shaft couplings handle four times more speed than standard servomotor couplings.

High-Misalignment Precision
Flexible Shaft Couplings

Specially designed ridges allow these bellows couplings to compensate for more misalignment than other precision couplings—useful for low-torque, high-precision applications such as instrumentation and motion control.

Electrically Isolating Servomotor
Precision Flexible Shaft Couplings

An acetal plastic spacer at the center of these couplings insulates bearings, encoders, and other shaft components from stray electric current. Use them with servomotors, which sometimes generate current that travels down the shaft and can damage circuit boards, interfere with readings, and cause wear on bearing raceways.

Clamping High-Parallel-Misalignment
Flexible Shaft Couplings

Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft.

Set Screw High-Parallel-Misalignment
Flexible Shaft Couplings

Each hub includes a set screw, which bites into your shaft to hold the coupling in place.

High-Angular-Misalignment Flexible Shaft Couplings

Also known as Schmidt couplings, these handle higher angular misalignment than other three-piece couplings. Good for applications with varying shaft misalignment, they're commonly used with conveyor rollers and roller feeds in printing and packaging machines.

Cleaned and Bagged Flexible Shaft Couplings

Often used in electronics manufacturing facilities and other extra-clean environments, these shaft couplings are cleaned and individually bagged to keep out contaminants.

Clamping Flexible Shaft Couplings

Designed to grip evenly around your shaft, these couplings provide more holding power than set screw couplings without marring the shaft.

Noncontact Magnetic Shaft Couplings

Magnetic force transfers torque from one half of these couplings to the other; there’s no contact between the parts, so they won’t wear. Couplings compensate for angular and parallel misalignment.

Keyless Locking Shaft Couplings for Overhung Loads

Keyless Locking Shaft
Couplings for Overhung Loads

Support the weight of a motor and transfer torque to another shaft at the same time with these couplings.

U-Joints

Precision Single U-Joints

A good choice when you need accurate and repeatable motion, these U-joints have zero backlash (no play), so there’s no motion lost when your shafts change direction.

Constant-Velocity Single U-Joints

To keep your shafts moving in sync, the flexible spring on these joints makes the output shaft move at the same rate as the input shaft.

Precision Double U-Joints

Since these U-joints have zero backlash (no play), there’s no motion lost when your shafts change direction, so machines move smoothly with more accurate, repeatable motion. As double U-joints, they connect and transfer torque between two shafts that are either parallel to each other or are misaligned at an angle.

Adjustable-Length Precision Double U-Joints

Lengthen and shorten these telescoping U-joints to fit your application. They’re a good choice when you need accurate and repeatable motion because they have zero backlash (no play), so there’s no motion lost when the shafts change direction.

About Shaft Couplings

Flexible Shaft Couplings

Servomotor Precision Flexible Shaft Couplings

Clamping Precision Flexible Shaft Couplings

Set Screw Precision Flexible Shaft Couplings

High-Speed Precision Flexible Shaft Couplings

High-Speed Servomotor PrecisionFlexible Shaft Couplings

High-Misalignment PrecisionFlexible Shaft Couplings

Electrically Isolating ServomotorPrecision Flexible Shaft Couplings

Clamping High-Parallel-MisalignmentFlexible Shaft Couplings

Set Screw High-Parallel-MisalignmentFlexible Shaft Couplings

High-Angular-Misalignment Flexible Shaft Couplings

Cleaned and Bagged Flexible Shaft Couplings

Clamping Flexible Shaft Couplings

Noncontact Magnetic Shaft Couplings

Keyless Locking Shaft Couplings for Overhung Loads

Keyless Locking ShaftCouplings for Overhung Loads

U-Joints

Precision Single U-Joints

Constant-Velocity Single U-Joints

Precision Double U-Joints

Adjustable-Length Precision Double U-Joints

High-Speed Servomotor Precision
Flexible Shaft Couplings

High-Misalignment Precision
Flexible Shaft Couplings

Electrically Isolating Servomotor
Precision Flexible Shaft Couplings

Clamping High-Parallel-Misalignment
Flexible Shaft Couplings

Set Screw High-Parallel-Misalignment
Flexible Shaft Couplings

Keyless Locking Shaft
Couplings for Overhung Loads