The washer refers to the part between the connected piece and the nut. Generally, it is a flat metal ring for protecting the surface of the connected member from the nut and the pressure of the dispersing nut against the connected member.
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Cixi Sinston Sealing MaterialCo.,Ltd. - is one of main exporters & manufacturers of Sealing material, insulation material and high Strength Fasteners in China .
washer is made of carbon steel,stainless steel 304,316 and so on . belong to fasterners . the quanitity is very big.