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Hexagon Socket Combination Screw Cylindrical Head Falt Spring Washer Zinc Plate Bolt Screw Three. Wide Material Options: Available in Stainless Steel, Carbon Steel, and Copper. Multiple Surface Finishes: Options include Natural, Black, Zinc-plated, Nickel, and Hot-dip Galvanized. Comprehensive Standards: Meets GB, DIN, ANSI, BSW, JIS, GOST, and UNS standards. Flexible Grade Selection: Available in Grades 4.8, 8.8, 10.9, and 12.9. Fast Urgent Delivery: Urgent orders delivered within 7-15 days. Same-Day Spot Goods: Spot goods delivered to warehouse on the same day. OEM and ODM Services: Customization available from samples and designs. Convenient Export Location: Factory located 35km from Ningbo Port for easy export.