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A2 70 A4 70 80 ASTM A193 B8 B8m Cl1 Cl2 DIN931 DIN933 ISO4017 ISO 4032 Inch Size 1/2" 3/4" Stainless Steel Heavy Hex Head Bolt with Nut, Find Details and Price about DIN931 Hex Bolts and Stainless Steel Hex Bolts from Shanghai G&T Industry Co., Ltd.