Belleville washer

STEVETERRY

Well-Known Member
A domed spring washer used in metal-to-metal lockwasher applications.
Also known as a Belleville spring or a cupped spring washer.

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A disc spring (sometimes called a "Belleville washer" after the inventor) consists primarily of a convex disc supported at the outer periphery by one force and an opposing force on the center of the disc. Disc springs are used singly, or in stacks, to achieve a desired load and travel. The advantage of a disc spring is that it generates high force in a very short spring length and with minimal movement when compressed. All discs are preset so that they will not significantly relax under load over time.

See this link for proper installations of Belleville washers in electrical applications: How To Use Belleville Washers Correctly.
 
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