... 12 product lines of machining, 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, stainless steel(5)Packing: Standard export packing or According to customer's requirement high quality sorts of plow bolts and ...