Washer
Washer : (Techn) A round, usually metallic disk with a hole used with nuts and bolts to protect the material being fastened and to spread the load. Note: A split ring, called a spring lock washer, is used to prevent nuts and bolts from loosening. An antiturn (toothed lock washer) is used to prevent the fastener from loosening in service from vibration. Some nuts and bolts come with permanent locking washers built in
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