Keyed Hubs | McMaster-Carr

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About Shaft Couplings

Split-Tapered Bushings

The tapered barrel on these bushings is split on both sides, allowing them to contract more tightly around the shaft than quick-disconnect and taper-lock bushings.

Quick-Disconnect (QD) Bushings

The screw connections on these bushings easily mate to compatible quick-disconnect sprockets and pulleys.

Taper-Lock Bushings

Mount these hubless bushings flush into your sprocket or pulley for a slim profile with no protruding screws.

Flanged Screw-Clamp Bushings

A mounting flange prevents movement during tightening.

Flush-Mount Screw-Clamp Bushings

Insert these bushings into the bore of your sprocket for flush or recessed mounting.

Corrosion-Resistant Flanged Screw-Clamp Bushings

Made from stainless steel or plated with nickel, these bushings resist corrosion. A mounting flange prevents movement during tightening.

Hub-Mount Screw-Clamp Bushings

Transfer torque directly from a shaft to a hub.

Corrosion-Resistant Flush-Mount
Screw-Clamp Bushings

Insert these nickel-plated steel bushings into the bore of your sprocket for flush or recessed mounting in wet environments.

Flexible Shaft Couplings for Forward/Reverse Motion

Set Screw Flexible Shaft Couplings

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

High-Torque Set Screw Flexible Shaft Couplings

The thick split spider on these couplings takes on twice as much torque as standard split spiders, while a set screw holds the hubs in place on your shaft. Also known as jaw couplings, use them to connect motors to pumps, mixers, and other high-torque equipment.

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.

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.

Shock-Absorbing Flexible Shaft Couplings

A strip of flexible spring steel wraps around the teeth of both hubs to absorb sharp, momentary load increases that can come from motor startups, emergency braking, or sudden impact with hard objects.

Metal-Detectable Flexible Shaft Couplings

Safely connect slightly misaligned shafts near food lines—the spider on these couplings contains metal, so it’ll trigger a metal detector if a piece frays off and contaminates your batch.

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.

Set Screw Vibration-Damping
Precision Flexible Shaft Couplings

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

Clamping Vibration-Damping
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.

Flexible Shaft Couplings for Continuous Motion

High-Torque Flexible Shaft Couplings

With a rugged roller-chain design, these couplings provide excellent torque and angular misalignment capacities.

Ultra-High-Torque Flexible Shaft Couplings

With a rigid gear design, these steel couplings transmit more torque than other couplings of the same size.

Lightweight Flexible Shaft Couplings

Made with lightweight nylon sleeves, these gear couplings require less energy to move than other high-torque flexible couplings. They compensate for parallel, angular, and axial misalignment.

High-Speed Vibration-Damping
Flexible Shaft Couplings

Use these gear-shaped couplings for high-speed and high-torque applications.

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.