... machining, welding, heat treatment, assembly, painting, casting ect.,3. bolts and nuts(1)Grade: 4.8 -- 12.9,A2, A4(2 ... , hot dip galvanized, dacroment(4)Material:Carbon steel, stainless steel(5)Packing: Standard export packing or According to customer's requirement high quality ... sorts of plow bolts and hex nuts