Shaft Collars

Shaft collars are (typically) ring-shaped devices that clamp around a shaft, securing mechanical components in place. Found in power transmission applications, they are available in a variety of styles and materials.

Pin-type gear hubs, clamp-type gear hubs, and Fairloc® gear and dial hubs are available in 303 stainless steel and anodized aluminum. These hubs can be assembled into gears or dials, and passivation is available.

For best performance, always consider where and how the shaft collar will be used before making your selection.

Common Applications:

  • Used to accurately align and position mechanical components such as gears, gear assemblies, split hub gears, pulleys, bearings, motors, and motion control products in power transmission and automation.
  • Use as spacers or stops for precise positioning in medical devices, labs, inspections, and measuring equipment.

Types of Collars

Set Screw 
Set Screw Shaft Collars are collars that are locked into position with a set screw that is tightened into the shaft. The downside to this design is the possible damage to the shaft caused by the set screw, making it difficult to reposition the collar if needed. Found in a wide range of applications, precision set screw shaft collars are available for shaft sizes as small as 5/64” and are manufactured in steel, stainless steel, and aluminum.

Clamp Type
Shaft collars that clamp onto a shaft provide an advantage over the set screw collar. Clamp screws tighten the clamp type collar around the shaft eliminating any damage to the shaft. One- and two-piece clamp type shaft collars are easy to install and reposition if required.

Precision and commercial balanced-type shaft/hub clamps are available in zinc-plated carbon steel, 303 stainless steel and 416 stainless steel. IDs range from 0.188” to 0.438” for shaft sizes 1/8” to 3/8”.

Split collar type clamps accommodate shafts ranging in size from 1/16” to 3/8”. Made of carbon steel, 303 stainless steel, 416 stainless steel and anodized aluminum, all are supplied with a stainless-steel socket head cap screw.

Part series S21SAC-…, fine-adjust shaft collar clamps to a shaft as a spacer or stop for precise positioning. This shaft collar provides easy and precise stroke adjustment up to 0.44 inch. Rubber bumpers serve as shock absorbers for compression loads and are oil and chemical resistant.

Quick release Fastlock shaft collars are used for component retention and positioning. Simply slide Fastlock®onto a shaft to the correct position and it will lock in place. Tools are not needed. To release, hold body and pull on the release ring and Fastlock will easily slide off. Made of 303 stainless steel it is usable on nonhardened shafts. Available for shaft sizes ranging from 0.250 to 2.000 (10 mm to 40 mm).

Another clamp type shaft collar is the Fairloc® shaft collar with integral bearing shim spacer used to preload the bearing. The exclusive SDP/SI Fairloc® design provides precision positioning, will not mar the shaft, and provides more holding strength than set screw shaft collars. The compact, self-contained design reduces misalignment and can be tightened and released repeatedly.

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