Product Name: Twist off Type Tension Control Structual Bolt Screw with Heavy Hex Head and Round Head Configurations ASTM F1852 Model NO.: Twist Bolt Finish: Yzp&Blk&Zinc Plated&HDG Application: Machinery, Chemical Industry, Environmental, Building Grade: 10.9 Standard: DIN, ANSI, GB, JIS, BSW, GOST Head Style: Hex Socket Head Connection: Common Bolt Type: Hex Head,Round Head Material: High Strength Steel Process: Cold Forging,Hot Forging,Machining Trademark: STRONG BOLT Transport Package: Small Box & Bulk & Customizing Specification: M12-M36 Origin: Ningbo, China HS Code: 7318150000 Product Description ItemTwist Off Type Tension Control Structual Bolts with Heavy Hex Head and Round Head Configurations ASTM F1852Grade10.9MaterialAlloy SteelSurface TreatmentBlack, Zinc Plated(ZP), Yellow Zinc Plated (YZP)and Hot DIP Galvanizing(H. D. G. ), Dacromet, Nickel Plated, Brass Plated.