What is the ASTM specification for stainless steel washers?
Stainless steel washers are not made to an ASTM specification; they are only made to raw material specifications. Most stainless steel ASTM bolt specifications refer to the raw material specification they are made from as the appropriate washer to use in conjunction with the bolt. Hence, an ASTM A193 or A320 grade B8M bolt, made from type 316 stainless steel, requires a type 316 stainless steel washer. An ASTM A193 or A320 grade B8 bolt, made from type 304 stainless steel, requires a type 304 stainless steel washer. These standard washers are typically made to the dimensional tolerances of ASME B18.21.1.