hex bolt 1,Material: 1045,5140,4135 2,Quality:8.8,10.9,12.9grade 3,According to your requirement. hex bolt1. 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) For more product details, please don’t hesitate to ...