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High Quality Carbon Steel U Bolts From China Grade 12.9. High Strength Grade: Available in Grade 10.9 and 12.9 with hardness HRC32-42. Customizable Color: Support for any color customization to meet specific needs. Wide Product Range: Over 800 different sizes of U bolts, center bolts, and wheel bolts. OEM/ODM Service: Full customization available from samples and designs. Fast Lead Time: Production lead time of 7-10 working days for standard orders. Low MOQ: Minimum order quantity as low as 10 pieces for U bolts. Quality Assurance: Pre-production samples and strict final inspection before shipment. ISO Certified: Certified under ISO/TS16949 for automotive quality standards.