Hub Bolt and Nut for MAZ. --Grade 8.8/10.9/12.9; --Black/Grey Color, Yellow/Silver Zinc Coating. DEXIN--Expert of High-strength Hub Bolt (Wheel Bolt) Item Model Hub Bolt and Nut for MAZItem No. DXR001Grade 8.8, 10.9, 12.9Material 45#, 40Cr, 35CrMo (SAE1045, 5140, 4135)Color Black Oxide, Grey Phosphate, Yellow/Silver Zinc Coating, DacrometQuality of Grade 10.9 Bolt Hardness: HRC34-38, HB341-352 ...