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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 Stainless Steel. The A4 steel grade allows you to use fasteners with significant temperature changes and in an aggressive and humid environment.
No coating.
Analogs GOST 10450-78, ISO 7092
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