Profiles Of Shaft Collars
16/11/2021 | Depcom Blog Team
Shaft collars produced by Iwata can be broadly categorised into two main profiles, depending on how they are fastened onto shafts; either by using a set screw against the shaft or clamp style, which refers to the use of a screw to clamp parts of a shaft collar against each other.
Set screw shaft collars:
Set screw shaft collars are usually produced as a single piece that is uniform throughout without any slits or grooves and are secured in place with two set screws (usually) that get fastened onto the shaft. These set screws have a soft brass tip so as not to create frictional damage against the shaft.
It should be noted that set screw shaft collars will work best when it is harder than the shaft it is fastened onto. A shaft that is harder will compromise the holding power of the shaft collar.
Clamp Type Shaft Collars:
Clamp style shaft collars are fastened onto shafts by a screw (or two) that tightens the collar, usually on the side. The screw does not have any contact with the shaft itself, thus minimizing any frictional damage that might occur.
Under clamp style, there are further three main types of collars, namely: Wedge-lok, Slit and Split (or Two-Piece Separated).
Wedge-lok shaft collars are single piece shaft collars produced with a special wedge that are fastened with a cap screw. As you can see from the example below, there is an added bushing that tightens itself on the shaft as a screw is fastened through it. Ultimately, the screw gets fastened within the collar and does not come into contact with the shaft itself.
Wedge lok shaft collars come with a lever which is convenient for collars whose positions need to be adjusted frequently. The lever tightens and releases the collars within seconds, thus eliminating the need for any allen keys or wrenches.
Slit shaft collars are cut on one side while remaining joined on the other. Slit shaft collars easily wrap around any type of shaft without damaging or causing any impression on the shaft. The slit type shaft collar can be tightened externally without any screw touching the inner shaft.
Split (also known as two-piece or separated) shaft shaft collars offer more convenience in terms of clamping, adjustment, quick removal and replacement. Split shaft collars fully clamp the circumference of the shaft leaving no clearance because of two externally tightened screws which bear torque and force protecting the shaft from any stress or impingement from set screw collars.