Wheel bolt for truck and trailer, trailer bolt, brake parts, trailer parts.truck parts Wheel bolt for truck and trailer, u-BOLTwheel bolt: grade 10.9 and 12.9,HRC:34-37 Tensile strength: 104N/mmFinishing: zinc plated, black oxidematerial: 40Cr, 45steel.We can make different kind of bolt and nut, according with your specifications requirment. semi-trailer truck wheel bolt