The shaft collar can be a simple, however essential, machine component discovered in many power transmitting applications, most notably motors and gearboxes. The collars are utilized as mechanised prevents, locating components, and bearing faces. The basic style lends itself to easy installation. Many people will become familiar with shaft collars through using Meccano.

1.Set mess style

　　The initial mass-produced shaft collars had been arranged screw collars and were used primarily on line shafting in early manufacturing mills. These early shaft collars were solid band types, utilizing square-head set screws that protruded from the collar. Protruding screws proved to be a problem because they could catch on a worker’s clothes while rotating on a shaft, and draw them into the equipment.
　　Shaft collars saw few improvements until 1910 through 1911, when William G. Allen and Howard Capital t. Hallowell, Sr, operating independently, introduced in a commercial sense practical hex socket head arranged screws, and Hallowell patented a shaft collar with this safety-style set mess. His basic safety set collar was quickly duplicated by others and became an market standard. The invention of the security arranged collar was the beginning of the recessed-socket screw industry.
　　Arranged mess collars are greatest utilized when the materials of the shaft is normally softer than the established screw. Regrettably, the arranged mess causes harm to the shaft – a flare-up of shaft material – which makes the collar harder to modify or remove. It is usually common to machine little flats onto the shaft at the arranged mess locations to eliminate this problem.

2.Clamping style

　　Clamp-style shaft collars are designed to resolve the complications connected with the set-screw collar. They arrive in one- and two-piece styles. Instead of protruding into the shaft, the screws take action to shrink the collar and locking mechanism it into place. The ease of make use of can be taken care of with this style and there is normally no shaft harm. Since the screws compress the collar, a even distribution of power can be enforced on the shaft, leading to a keeping power that can be almost twice that of set-screw collars.
　　Although clamp-type collars function extremely well under relatively constant a lot, shock lots can trigger the collar to shift its placement on the shaft. This is definitely due to the extremely high factors that can become developed by a fairly little mass during impact, likened to a statically or gradually applied load. As an option 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 prevent that is definitely more resistant to shock a lot.
　　Perhaps the most innovative and useful of the collars is definitely the two-piece clamping collar. Two-piece clamp-style shaft collars can become disassembled or set up in placement without having to remove various other elements from the shaft. The two-piece design provides better clamping push than a one piece clamp because all of the pressure can be moved straight into clamping the shaft. In one piece styles, the non-tightened aspect provides unfavorable push as it must hold the collar open to enable it to end up being placed onto the shaft. The one tightener must function against this force as well as provide clamping power of its own.
　　Two-screw clamps still offer push on two sides (one dimensions) only. Four (or even more) mess clamps offer power on four (or even more) sides, and therefore two proportions.

3.Axial clamps

　　A further processing of shaft collars is usually where a single bolt and nut encompases the shaft. The bolt (exterior line) is usually has kerf cuts, producing fingers, which are compressed onto the shaft as a nut can be tightened over it. These are found on contemporary tripod legs and collets. If wrench-tightened, these can end up being very limited.

4.Drill collars

　　In drilling, a drill collar includes a weighty tube above the drill bit in a drill chain.