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Hex Nut Bolt Matching M2 M3 M6 M8 M12 Nut. Strict ISO4032 standard, full sizes M2-M12 in stock. Dual material options: Black finish carbon steel / 304 & 316 stainless steel. Precision cold-forged & accurate thread, smooth assembly, anti-loosening under vibration. Black oxide carbon steel: high tensile strength, cost-effective for general machinery. SS304(A2-70) / SS316(A4-80): rust & acid resistant, fit marine & chemical equipment. Hexagon design, compatible with all standard wrenches & sockets. Factory direct supply, stable stock, fast delivery & competitive bulk price. Rigorous dimension inspection, no slippage, long service life.