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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.
A Belleville washer is a type of spring shaped like a washer. It is the shape, a cone frustum , that gives the washer its characteristic spring. The "Belleville" name comes from the inventor Julien Belleville who in Dunkerque , France, in 1867 patented a spring design which already contained the principle of the disc spring.
Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers. [1] Now widely manufactured, they are available in a range of standard sizes and materials [ 2 ] [ 3 ] [ 4 ] A bonded seal consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an elastomeric material that acts as a ...
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In the inter-war years they came in two types. The first is built into a brickwork furnace and was found in older houses. The second was the free-standing or portable type, it had an enamelled metal exterior that supported the inner can or copper. The bottom part was adapted to hold a gas burner, a high pressure oil or an ordinary wood or coal ...
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