Wheel Hub Bolt for Trailer and Truck 1. Material: 45#(SAE1045)/40Cr(SAR5140)/35Crmo(SAE4135) 2.Quality Grade: 8.8,10.9,12.9-grade 3.Surface: Galvanized(Yellow/Silver), Phosphated, Dacromet 4.We can make products strictly according to customers' requirement(drawings or samples)For more product details, please don’t hesitate to contact us. Your inquiry is highly appreciated.Looking forward to establish Long-Term Cooperation with you.