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3. A rivet is a permanent mechanical fastener.
Before being installed, a rivet consists of a smooth
cylindrical shaft with a head on one end.
4. A fastener is a hardware device that mechanically
joins or affixes two or more objects together.
5. A washer is a thin plate (typically disk-shaped) with a
hole (typically in the middle) that is normally used to
distribute the load of a threaded fastener.