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Assorted washers: flat, split, star and insulating. A washer is a thin plate (typically disk-shaped, but sometimes square) with a hole (typically in the middle) that is normally used to distribute the load of a threaded fastener, such as a bolt or nut.
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.
A shim is a thin and often tapered or wedged piece of material, used to fill small gaps or spaces between objects. [1] Shims are typically used in order to support, adjust for better fit, or provide a level surface. Shims may also be used as spacers to fill gaps between parts subject to wear.
A concrete spacer with a plastic clip in use Concrete spacers in a precast element Diaphragm wall block on rebar for a Diaphragm wall. A rebar spacer is a short, rod-like device used to secure reinforcing steel bars, or rebar, within cast assemblies for reinforced concrete structures. The rebar spacers are fixed before the concrete is poured ...
As it is stronger in thin sections between mechanically rigid components, rather than relying on its own strength, it has mostly been used as washers, gaskets, and a variety of shims or packing pieces. Fibre washers are one of the cheapest conformal elastomer gaskets for sealing pipe unions and general plumbing work. They swell slightly with ...
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 ...
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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.
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