bolts and nuts 1.experienced manufacturer 2.high qulity material 3.we can do it as ... welding, heat treatment, assembly, painting, casting ect.,3. bolts and nuts(1)Grade: 4.8 -- 12.9,A2, A4( ... 2)Size: M3-M72(3)Finish:plain, zinc plated, hot dip galvanized, dacroment(4)Material:Carbon steel, ... export packing or According to customer's requirement high quality sorts of plow bolts and hex nuts