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A flat (narrow, flat) washer is a fastening product that has a reduced outer diameter and almost does not protrude beyond the size of the cap of a standard bolt or nut. It is made of steel with a hardness of 140, 200 HV.
Scope DIN 433 is used to increase the clamping area for various types of connections, reduce pressure on the surface of the connecting materials, and reduce friction between the nut and the surface of the part when screwing.
Material high-strength structural alloy steel.
Coating Zinc protects against corrosion if fasteners are intended to be used in aggressive environments.
Analogs GOST 10450-78, ISO 7092