Bolt: 7/8'-11BSF,1 1/8'-9BSF,L=147mm Nut1:7/8'-11BSF,S=35,H=23mm Nut2:1 1/8'-9BSF,S=41,H=46mm Material:45#,40Cr,35CrMo Wheel bolt and nuts for truck and trailer1. Material: 45#(SAE1045)/40Cr(SAR5140)/35Crmo(SAE4135)2.Quality Grade: 8.8,10.9,12.9-grade3.Surface: Galvanized(Yellow/Silver), Phosphated, Dacromet4.We can make products strictly according to customers' requirement(drawings or samples) ...