Bolt, Nut, Customized Fastener manufacturer / supplier in China, offering 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, DIN 934 ISO 4032 Carbon Steel Grade 4-Grade 12 Metric M2-M56 Zinc Plated Hot-DIP Galvanized 2h Heavy Hex Nut, High Quality Stainless Steel M4-M20 Lifting Eye Bolt with Nut and so on.