... ,Black,Teflon Coating(PTFE) Black, White,Blueness Zinc,Nickel Plating Stud Bolts & Nuts Size 1/2"-2" Specification ASTM A193 B7/B16 ... /B8M;ASTM A194 2H/8/8FProduct Description Product Name:STUD BOLT & U_BOLTS:1. Din 975, class 4.8, class 8 ... to us.*We can also manufacture special application bolts & nuts that customers require,according to customers' Drawings and/or samples. SS304 stud bolts