The shaft collar is usually a basic, however important, machine component discovered in many power transmission applications, most especially motors and gearboxes. The collars are utilized as mechanical stops, locating parts, and bearing faces. The simple style lends itself to easy installation. Many people will end up being familiar with shaft collars through using Meccano.
1.Set mess style
　　The initial mass-produced shaft collars were set screw collars and had been utilized mainly on line 
shafting in early manufacturing mills. These early shaft collars had been solid band types, utilizing square-head established screws that protruded from the collar. Protruding screws proved to end up being a issue because they could catch on a worker’s clothes while revolving on a shaft, and pull them into the equipment.
　　Shaft collars saw few improvements until 1910 through 1911, when William G. Allen and Howard T. Hallowell, Sr, functioning independently, introduced commercially viable hex socket mind arranged screws, and Hallowell trademarked a shaft collar with this safety-style established screw. His safety established collar was quickly replicated by others and became an sector standard. The invention of the security established collar was the starting of the recessed-socket screw market.
　　Set screw collars are greatest used when the materials of the shaft can be softer than the set mess. Unfortunately, the set mess causes damage to the shaft – a flare-up of shaft materials – which makes the collar harder to change or remove. It is certainly common to machine little flats onto the shaft at the arranged screw places to remove this problem.
2.Clamping style
　　Clamp-style shaft collars are designed to solve the complications associated with the set-screw collar. They arrive in one- and two-piece designs. Instead of protruding into the shaft, the screws action to shrink the collar and locking mechanism it into place. The convenience of use is usually maintained with this style and there is certainly no shaft harm. Since the screws shrink the collar, a even distribution of pressure is definitely enforced on the shaft, leading to a holding power that is definitely nearly double that of set-screw collars.
　　Although clamp-type collars function extremely well under fairly constant tons, shock loads can trigger the collar to change its position on the shaft. This is certainly credited to the very high energies that can become made by a relatively small 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 produced on the shaft and a clamp collar can be utilized to create a positive prevent that is even more resistant to shock a good deal.
　　Perhaps the most innovative and useful of the collars is usually the two-piece clamping collar. Two-piece clamp-style shaft collars can be disassembled or set up in placement without having to remove other components from the shaft. The two-piece design provides better clamping power than a single piece clamp because all of the pressure is normally transferred directly into clamping the shaft. In solitary piece designs, the non-tightened aspect provides detrimental drive as it must keep the collar open up to enable it to end up being positioned onto the shaft. The single tightener must function against this power as well as provide clamping drive of its very own.
　　Two-screw clamps still offer pressure on two edges (one dimensions) only. Four (or more) mess clamps provide drive on four (or even more) sides, and thus two proportions.
3.Axial clamps
　　A further processing of shaft collars is certainly where a one bolt and nut surrounds the shaft. The bolt (outside line) is usually offers kerf cuts, producing fingers, which are pressurized onto the shaft as a nut is usually stiffened over it. These are discovered on contemporary tripod legs and collets. If wrench-tightened, these can be very limited.
4.Drill collars
　　In drilling, a drill collar includes a weighty pipe above the exercise bit in a drill chain.