Dear Sir/Madam, Standard:DIN Available Material:Stainless Steel,Carbon steel,High strength steel,brass,Alloy Steel Head Style:Hexagon, Round, Square, Countersunk, Pan, Mushroom International Standard:DIN,ANSI,GB,JIS,BSW,GOST Class/Grade:304,316,A2-70,A4-70,18-8 Connection:Common Bolt, Hinged Bolts Type:Hex Socket Head Sems Screws Application:Machinery,Chemical Industry, Environmental,Building Surface Finishing:HDG,Black,Color-Zinc Plated,Polishing,Passivation,Dacromet Groove:Word,Triangle,Interior Angles Quartet,Cross,Special Production Technology:Cold forging, lathe& Machining, Hot forging Show More