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Washer
 

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Washer (mechanical)




A washer is a thin disk with a hole, usually in the middle. It is normally used to support the load of a Threaded Fastener . Other uses are as a spacer, spring (belleville, wave washers), wear pad, pre-load indicating device, and locking device.

Washers are usually Metal or Plastic . High quality capscrews require hardened steel washers to prevent the loss of pre-load after the Torque is applied (due to Brinelling ). Rubber or Fiber Gasket s used in Taps to stop the flow of water are sometimes referred to colloquially as ''washers''; while they may look similar, however, washers and gaskets are usually made differently and designed for different functions.

Washers are also important for preventing galvanic Corrosion , particularly by insulating steel screws from aluminum surfaces.


TYPES OF WASHERS

  • flat

  • --- fender washer

  • flat, hardened

  • lock

  • --- split

  • --- star

  • Belleville

  • wave



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