Hex Flange Nuts 1. Material: 35k,q235, c1010 2. Surface: Black, ZP, HDG ... .8,6.8,8.8 4. Standards: DIN933/931 Hex Flange Nuts1. Material: 35k,q235, c10102. Surface: Black, ZP, HDG3. Grade ... /C Min Order1000kg or 1 Tons for each size Hex Flange Nuts