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Stainless Steel Hex Nuts A4-80. Diverse Surface Coatings: Available in Black, Zinc, HDG, Phosphated, Dacromet, and other options. Comprehensive Certifications: Certified by API, ISO9001, Ad2000, CPR, and PED standards. Wide Size Range: Standard sizes available from M10 to M72. High Strength Grades: Offers Grade 8.8 and 10.9 stainless steel hex nuts. OEM Service Available: Customized specialty and non-standard parts are welcome. Multi-Industry Application: Serves machinery, oil & gas, construction, shipbuilding, and energy sectors. Integrated Manufacturer: Owns a 18,000 sqm facility for high-quality production. Rigorous Quality Assurance: Two-stage protocol including dimensional checks and full batch inspection.