... : ASTM / ASME A/SA 193 / 194 • Grade: B 8 (304), B 8C (SS 347), B 8M (SS 316), B 8 T (SS 321), A 2 ... , A 4, • Standard: ASTM / ASME SB 160 / 164 / 425 / 166 / 446 / 574 / 472 • Grade: UNS ... / ASME A/SA 193 / 194 GR. • Grade : B 6, B 7/ B 7M, B 16, 2, 2HM, 2H, GR 6, B 7, B 7M stainless steel fastener