U Bolt Material: Mild Steel, 45#, 40Cr,Q235 Grade: 12.9, 10.9, 8.8 Size: M12~M32 Surface: Painting, Zinc painting and others U-Bolt and Nut fastenerWe are one of the top manufacturers of Leaf Spring, U-bolt, and Center Bolts in China:With 6 product lines and 500 workers, our annual capacity is 60 thousand tons.80% of the production are for OEM customers and left for export. We have professional ...