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Everything You Need to Know about Shaft Collar

What is shaft collar
The shaft collars are a straightforward, yet essential, machine element found in several power transmission applications, most notably electric motors as well as transmissions. The collars are utilized as mechanical stoppers, situating components, and bearing fronts. The easy style lends itself to easy setup. In general, shaft collar type fall into one of two broad categories.

How to select a proper shaft collar?

Clamp Style Shaft Collars(Click for more)

These were developed to fix the problems connected with the set-screw collar. They are available in one and also two-piece designs. Rather than protruding right into the shaft, the screws act to compress the shaft collars as well as lock it into its location. The simplicity of use is preserved with this design and there is no shaft damages.
Although clamp-type collars work extremely well under fairly consistent pressure, certain types of loads can cause the collar to change its placement on the shaft. This is because of the high pressures that can be created by a relatively small mass influence, compared with a statically or progressively applied weight. 


Set Screw Collars(Click for more) 

The initial shaft collars were set screw collars, found mostly in very early factories and manufacturing plants. Set screw collars are best made use of when the material of the shaft is softer than the established screw. However, the established screw triggers damage to the shaft– a flare-up of shaft material– making the collar harder to change or eliminate. Here is the place to go if you need shaft collars or shaft couplers for your job.


Other Type:

One-Piece, Two-Piece, Threaded, Double Wide, Heavy Duty, Keyed, Mountable, Quick Clamping, Set Screw, Thin Line, Hex and D-Bore, Washdown Shaft Collars, Bearing Locknuts



  • Conveyors
  • Exercise Equipment
  • Truck Hoods
  • Lawn Mowers
  • Garbage Can
  • Lids Washing Machines;
  • Paint Mixers
  • High Pressure Sprayers
  • Solar Panel Farms
  • Wheelchairs
  • Hospital Beds
  • Food Processing Equipment
  • ATVs and Go Karts


Choosing a Shaft Collar

There are a variety of factors that determine which collar is ideal for an application. It is important to carefully identify all the relevant requirements, parameters, and limitations of your system before selecting a shaft collar.

In many applications, holding power is the key performance factor designers are looking for. It is affected by a variety of collar specifications and affects the collar’s maximum axial load. A set screw collars  holding power is dependent on how much the screw can impinge into the shaft, which is a function of the relationship between the screw and shaft materials.

Bore size and concentricity influence the holding power of Clamp style shaft collars , however the importance of fastening hardware cannot be understated. The size and quality of hardware, namely thread quality, tensile strength, and size tolerances, affect how much torque the screw can transmit to the collar. Forged screws are generally superior to broached screws as they are more consistent and are less likely to ream out. Likewise, the collar itself must be manufactured from a material strong enough to withstand the recommended screw torque or else it may crack or deform.


Small bore one-piece clamp style shaft collars  (1-5/8” or 38mm and under) are often machined with a back-cut opposite to the clamp cut. The back-cut reduces the cross-sectional area at the hinge point of the collar lowering the force required of the screw to clamp the collar around the shaft. This allows the screw to use more of its seating torque for holding power. As one piece-collars move up in size the size and strength of the screw increases to a point where the back-cut is no longer needed. 

Two-piece styles  reduce the amount of material that must be bent around the shaft and have the added advantage of a second screw to transmit torque. Even with these benefits holding power is only increased by about 5%. The choice between a one-piece or two-piece design largely comes down to convenience and the disassembly requirements of an application.




To Find Out More: Types of Shaft Collars

One Piece Shaft Collar

Two Piece Shaft Collar