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Shaft Collars

  • Metric and Imperial bores
  • Shaft Collars
  • Split Shaft Collars
  • Steel & Stainless Steel
  • Anti-corrosion finish


What is a Shaft Collar / Set Collar?

The shaft collar is a simple, yet important, machine component. The collars are used as mechanical stops, locating components, and bearing faces. The simplest design of shaft collar is the set-screw collar, which lends itself to easy installation. Set collars are often also described as Split Clamps. Clamp-style shaft collars are designed to solve the problems associated with the set-screw collar. Perhaps the most innovative and useful of this type of clamp collars is the two-piece clamping collar. Quick-Clamping collars are another variation of a one-piece collar style.

How does a Shaft Collar / Set Collar work?

Using an adjustable screw the set collar can be tightened securely and released freely.

The screws on Clamp-style shaft collars act to compress the collar and lock it into place using friction. They are easy to use and do not damage the shaft. The compression of the screws on the collar imposes a uniform distribution of force on the shaft. The resulting holding power is nearly double that of set-screw collars. However, in single piece clamp-style designs, the non-tightened side provides negative force, as it must also hold the collar open to allow it to be placed onto the shaft. The single screw tightener works against this force as well as providing a clamping force of its own.

In contrast, the two-piece clamp-style shaft collar can be disassembled or installed in position, without having to remove other components from the shaft. This two-piece design provides greater clamping force than a single piece clamp because all of the force is transferred directly into clamping the shaft. Two-screw clamps still provide force on two sides (one dimension) only. Four (or more) screw clamps provide force on four (or more) sides, and thus two dimensions.

What does a Shaft Collar /Set Collar look like?

Set-screw collars consist of a simple ring with an insert screw that tightens against a shaft. Clamp-style shaft collars come in one- and two-piece designs. The two-piece collar has double the amount of screws the one-piece has.

What does a Shaft Collar / Set Collar do?

Shaft collars/Set Collars as they are also known, allow the positioning of tools and attachments to a shaft.

Where is a Shaft Collar / Set Collar used?

Shaft Collars/Set Collars are usually found in power transmission applications, such as motors and gearboxes.

Good to know about Shaft Collars / Set Collars?

Set screw collars are best used when the material of the shaft is softer than the set screw material. The set screw causes damage to the shaft (a flare-up of shaft material). This makes the collar harder to adjust or remove. Small flats machined onto the shaft at the set screw locations can help to eliminate this problem.

Clamp-type collars work very well under relatively constant loads, however, shock loads can cause the collar to shift its position on the shaft. This is due to the very high forces that can be created by a relatively small mass during impact, compared to a statically or gradually applied load. An option for applications with this type of loading, is to make an undercut on the shaft and to use a clamp collar to create a positive stop, that is more resistant to shock loads.

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