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Other uses are as a spacer, spring (Belleville washer, wave washer), wear pad, preload indicating device, locking device, and to reduce vibration (rubber washer). Washers are usually metal or plastic. High-quality bolted joints require hardened steel washers to prevent the loss of pre-load due to brinelling after the torque is applied.
In general, a spacer is a solid material used to separate two parts in an assembly. Spacers can vary in size from microns to centimeters. They can be made of metal, plastic, glass, and other materials. Shapes include flat sheet, cylindrical and spherical. Two sizes of metal standoffs and one plastic standoff.
Small changes include the sets of spacers between the aluminum spines and the wood panels, originally of rubber, later hard plastic washers, and the number of screws securing the armrests, originally three, changed to two in second-series models, while the "domes of silence" (glides/feet) on the chair base originally had thinner screws ...
Pre-cut metal shims, all with a thickness of 1.00 millimeter. Many materials make suitable shim stock (also often styled shimstock), or base material, depending on the context: wood, stone, plastic, metal, or even paper (e.g., when used under a table leg to level the table surface).
In applications where vibration or rotation may work a nut loose, various locking mechanisms may be employed: lock washers, jam nuts, eccentric double nuts, [1] specialist adhesive thread-locking fluid such as Loctite, safety pins or lockwire in conjunction with castellated nuts, nylon inserts , or slightly oval-shaped threads.
They may also be used with hydrocarbons, provided the temperature is not too high. Unlike rubber, fibre washer seals are considered as a single-use item. Fibre sheet is easily die-cut to complex shapes and so it is widely used for shaped gaskets. These may be used for sealing, as heat insulators, or as mechanical spacers.
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