Shaft Collars: Types, Materials, and Specifications Explained

A shaft collar is a circular mechanical device that fits around a shaft, rod, tube, or pipe. Think of it as a strong clamp that prevents parts from sliding along the shaft and keeps everything properly positioned. These components serve three main purposes: holding components in place, positioning parts on the shaft, and providing contact points between the shaft and other components.

Set Screw Collars

Set screw collars are the simplest and most economical option. They consist of a solid ring with a recessed screw that bears directly onto the shaft surface, creating an indentation that resists axial movement. Although they offer reliable holding power when the screw material is harder than the shaft, they permanently mar the shaft and require end-of-shaft access for installation.

Slit Collars

Slit collars feature a single narrow slot that allows the ring to compress evenly around the shaft when the clamping screw is tightened. This design avoids shaft damage and provides good holding power for light- to moderate-duty applications, though it still demands end-of-shaft access to install or adjust the collar.

Split (Two-Piece) Collars

Split collars consist of two separate halves joined by multiple screws, converting all torque directly into clamping force. Their ability to be fitted anywhere along the shaft without disassembly makes them ideal for heavy-duty, high-torque, or confined-space applications, and they deliver superior axial holding power and shock-load resistance.

Hinged Collars

Hinged collars combine two-piece strength with a captive hinge and single screw, preventing lost parts and enabling rapid installation in tight spaces without shaft end access. They’re available in various bore shapes (round, hex, square, threaded) for versatility in field and industrial settings.

Wedge Collars

Wedge collars employ a tapered wedge element driven into a V-groove by tightening screws, multiplying the applied force into exceptionally high clamping pressure and precise positioning. This makes them perfect for heavy-duty stopping and precision-positioning systems.

One-Touch Collars

One-touch collars use cam or eccentric levers to lock and unlock with a quarter-turn, providing consistent spring-loaded clamping without tools. Their rapid, ergonomic operation and visual on/off indicators make them ideal for frequent changeovers, conveyor adjustments, test fixtures, and laboratory equipment.

Threaded Bore Collars

These collars have internal threads that screw directly onto threaded shafts, providing uniform force distribution and precise positioning. They're excellent for applications requiring fine adjustments.

Urethane Lined Collars

Urethane linings provide extra grip and protect shaft surfaces. They're ideal for applications involving delicate or precision shafts.

D-Cut and 2-Flats Designs

These specialized bore shapes match non-round shafts, preventing rotation while maintaining axial positioning.

Side Mount Holes

Some collars feature mounting holes for attaching additional components or securing the collar to surrounding structures.

Clamp Lever Types

Collars with integrated levers allow quick, tool-free adjustments without requiring wrenches or screwdrivers.