center bolt and nut 1.material:mild steel,45#steel,40Cr steel 2.surface: ... ,8.8,10.9 centre bolt,truck centre bolt with nut, high tensile centre bolts and nuts ,galvanized centre bolt grade ... , 3.0mmFinishingzinc plated, phosphated, black Oxide...Satisfactory services:We can produce wheel bolts as per your drawing and/samples.We can ... , please feel free to contact me. Quanzhou center bolt and nut