Carbon Steel Spherical Hex Nut for Bridge Construction Briadge Accessories Fastener. High Strength Material: Made from carbon steel 45# or 40Cr, heat-treated for high tensile strength. Precise Thread Matching: Perfectly matches precision-rolled rebar threads to prevent stripping. Customizable Options: Customized name and level options available for specific project requirements. Anti-Corrosion Finish: Options include black oxide, zinc plating, and phosphating for durability. Fast Delivery: 5-7 days for in-stock items; 7-30 days for customized orders. Global Standards: Complies with ANSI, DIN, GB, and JIS standards for international use. OEM/ODM Service: Accepts OEM/ODM orders for large quantities at no extra charge.