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Hex Head Zinc Plated Large Diameter Concrete China Screw. Wide Grade Range: Available in grades 3.6 to 12.9 for diverse strength requirements. Flexible Customization: OEM/ODM support for head shape, thread, length, and material. Multiple Surface Treatments: Options include Hot Galvanized, Dacromet, Black, and Color-Zinc. International Standards: Compliant with DIN, GB, ANSI, BSW, JIS, and GOST standards. High-Quality Material: Made from hardened carbon steel with 13 grade galvanized steel. 100% QC Inspection: Every batch undergoes checks for accuracy, torque, and corrosion. Fast Delivery: Standard orders ship within 15-25 days; urgent orders available. Low MOQ Support: MOQ starts from 100,000 pieces, flexible for special cases.