Bearings

bearings
Bearings. A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the moving parts of the bearings – the inner and outer part of thebearings. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads.

Fastener

A fastener is a hardware device that mechanically joins or affixes two or more objects together.Fasteners can also be used to close a container such as a bag, a box, or an envelope; or they may involve keeping together the sides of an opening of flexible material, attaching a lid to a container, etc.