Hex Bolts and Nuts 1. Material: 35k,q235, c1010 2. Surface: Black, ZP, ... : 4.8,6.8,8.8 4. Standards: DIN933/931 Hex Bolts and Nuts1. Material: 35k,q235, c10102. Surface: Black, ZP, HDG3. Grade ... quality and provide the good service. We always invest to improve the technology and the quality to meet the demand of the market. Hex Bolts and ...