
Cost Effective Carbon Steel Castle Nut Slotted Nut Fastener. Wide Grade Range: Available in Gr.4.6 to 12.9, covering DIN, SAE, and ANSI standards. Custom Surface Finish: Options include Zinc Plated, Black Oxide, Galvanized, and Dacroment. OEM/ODM Service: Professional manufacturer accepts custom orders with competitive pricing. Strict Quality Control: In-house lab performs chemical, mechanical, and corrosion resistance tests. Fast Delivery: Standard items ship in 5-15 days; customized items in 30-60 days. Free Sample: Free samples available for standard fasteners to test quality before order. Experienced Manufacturer: 30 years experience with 30,000 sqm production base and 100+ employees. Global Certification: ISO9001, ISO45001, and ISO14001 certified with exports to worldwide markets.