... ,black,zinc plated(yellow,blue) YongnianXiongguang Fastener Manufacturing Co.,Itd. is a professional manufacturer ofstandard parts, mainly the production of industrial and ... Hex Bolts and Nuts1. Material: 35k,q235, c10102. Surface: Black, ZP, HDG3. Grade: 4.8,6.8,8.84. Standards: DIN933 ...