Shaft collars are used to position and locate components on a shaft. They also help to limit the movement of the shaft. There are many different types of shaft collars available. Each of these collars has different characteristics. As a professional manufacturer and distributor of shaft collars, we also provide custom shaft collars with special requirements.

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If it is ball bearing, it is of higher pair. since the balls in the bearing have point contact with the surface.

if it is a journal bearing, it is of lower pair. since the jounal is having surface contact with the shaft.

This question refers to the type of pairs in a mechanical joint...

Axle shaft, steering shaft, drive shaft, distributor shaft

A regular shaft has regular flex.