Also known as a disc spring or cupped spring washer, a Belleville washer is a unique washer-style fastener that’s characterized by a cupped construction. As shown in the image here, Belleville washers don’t lie flat. Rather, they feature a canonical shape in which the inner portion is higher than the lower portion.
Belleville washers are used just like conventional washers by featuring a center hole through which a fastener, such as a bolt, is placed. But their unique canonical shape makes them particularly effective in using them to solve vibration, thermal expansion, relaxation and bolt creep problems.
All images are indicative only.
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