DIN933 DIB931 hex head bolt 1.ISO 9001 certification 2.DIN,ISO ,GB,ANSI standard 3.SS304 SS316 Q235 Q215 4.A2-70 A4-80 DIN933 DIB931 hex head bolt DIN933 DIB931 HEX BOLT GRADE 4.8 8.8 The main products : stainless steel hex head bolts, hexagon socket setscrews, machine screws, expansion screws, ground screws, U-bolts and others. By using good quality raw materials at home and abroad, we can ...