Pin, Shaft, Spindle
The important components of most of products. Metal pin is a component used for terminal contact, fastening objects together, inserted in a slot, groove or hole. A spindle is a rotating axis of the machine, which often has a shaft at its heart. A shaft is a rotating machine element, usually circular is cross section, which is used to transmit motion from one part to another. Those products are normally made of brass, stainless steel or carbon steel.