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China Manufacturer DIN 557 SS304 Stainless Steel Plain Polished Square Nut Price. Custom Manufacturing: OEM/ODM support with custom sizes, materials, and finishes based on drawings. Wide Material Selection: Available in Stainless Steel (201, 304, 316) and Carbon Steel with various grades. Multiple Finishes: Options include Polishing, Black Oxide, Zinc Plating, Hot-dip Galvanizing, and Bluing. Strict Quality Control: 100% QC inspection with composition and mechanical property tests before shipment. Factory Direct Supply: Source factory with mature production techniques and comprehensive quality control. Comprehensive Standards: Meets DIN, ANSI, GB, JIS, GOST, BSW, ISO, and ASTM standards.