Washer (hardware)
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A washer is a thin plate with a hole that is normally used to distribute the load of a threaded fastener, such as a bolt or nut. Other uses are as a spacer, spring, wear pad, preload indicating device
Assorted washers: flat, split, star and insulating
A plain washer and a spring washer are placed on a bolt between the nut (on the threaded end) and the bolt head.
Plain washer 1
Belleville washer
Fastener
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A fastener or fastening is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be
Washer (hardware)
…is a thin plate (typically disk-shaped, but sometimes square) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a bolt or nut. Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad, preload indicating device, locking device, and…
Typical fasteners (US quarter shown for scale)
Structural bolt DIN 6914 with DIN 6916 washer and UNI 5587 nut