The shaft collar is a basic, yet important, machine component discovered in many power transmission applications, most remarkably motors and gearboxes. The collars are used as mechanised halts, finding parts, and bearing faces. The basic style lends itself to easy installation. Many people will become familiar with shaft collars through using Meccano.

1.Set screw style

　　The initial mass-produced shaft collars had been set screw collars and had been used mainly on line shafting in early making mills. These early shaft collars were solid band types, employing square-head arranged screws that protruded from the collar. Protruding screws proved to be a problem because they could catch on a worker’s clothes while spinning on a shaft, and draw them into the equipment.
　　Base collars saw few improvements until 1910 through 1911, when William G. Allen and Howard Capital t. Hallowell, Sr, functioning independently, launched in a commercial sense viable hex socket mind established screws, and Hallowell copyrighted a shaft collar with this safety-style established screw. His protection arranged collar was soon duplicated by others and became an sector standard. The invention of the protection established collar was the beginning of the recessed-socket screw sector.
　　Established screw collars are best utilized when the material of the shaft is definitely softer than the established screw. However, the arranged mess causes damage to the shaft – a flare-up of shaft materials – which makes the collar harder to adapt or remove. It is certainly common to machine small residences onto the shaft at the set mess locations to eliminate this problem.

2.Clamping style

　　Clamp-style shaft collars are designed to solve the complications associated with the set-screw collar. They come in one- and two-piece designs. Instead of Gear rack sticking out into the shaft, the screws work to compress the collar and lock it into place. The convenience of use is definitely taken care of with this design and there is no shaft harm. Since the screws shrink the collar, a even distribution of force is certainly enforced on the shaft, leading to a keeping power that is usually almost double that of set-screw collars.
　　Although clamp-type collars work extremely well under fairly continuous lots, surprise tons can cause the collar to shift its placement on the shaft. This is usually due to the extremely high forces that can be created by a fairly little mass during influence, compared to a statically or gradually used load. As an choice for applications with this type of launching, an undercut can be made on the shaft and a clamp collar can be used to create a positive end that is normally more resistant to shock tons.
　　Perhaps the most innovative and useful of the collars is definitely the two-piece clamping collar. Two-piece clamp-style shaft collars can become taken apart or set up in position without having to remove other parts from the shaft. The two-piece style provides better clamping force than a one piece clamp because all of the pressure can be transferred directly into clamping the shaft. In one piece styles, the non-tightened aspect provides bad pressure as it must hold the collar open to allow it to be positioned onto the shaft. The single tightener must function against this force as well as offer clamping force of its own.
　　Two-screw clamps still provide force on two edges (one dimension) just. Four (or more) screw clamps provide push on four (or more) sides, and thus two measurements.

3.Axial clamps

　　A further refinement of shaft collars is usually where a single bolt and nut encompases the shaft. The bolt (outside twine) is normally has kerf slashes, making fingers, which are pressurized onto the shaft as a nut is stiffened over it. These are found on modern tripod legs and collets. If wrench-tightened, these can be extremely limited.

4.Drill collars

　　In drilling, a exercise collar consists of a large tube above the exercise bit in a drill chain.