... BOLTS AND NUTS 2. NANTE has two main manufacture bases, 5 main factories with 12 product lines of machining, welding, heat ... , painting, casting ect.,3. bolts and nuts(1)Grade: 4.8 -- 12.9,A2, A4(2)Size: M3-M72(3)Finish ... , hot dip galvanized, dacroment(4)Material:Carbon steel, stainless steel(5)Packing: Standard export packing or According to customer's requirement ...