Ningbo Refine Hardware Co., Ltd. is equipped with advanced, imported cold-heading machines, imported and highly accurate full pneumatic tapping, blind hole and round nut tapping machines, fully automatic nylon check nut combined machines, and many double machining units and equipment for testing products' mechanical performance. In addition to maintaining a high level of quality, our good equipment can also, through cold-heading, form various nut-type fasteners. We are able to produce hexagon, square, round, cap, or combination / complicated shapes, with external diameters ranging from 4mm to 30mm, and head thickness from 1mm to 60mm Our main products include hexagonal nuts, nylon check nuts, all-metal check nuts, flange nuts, cap nuts, square nuts, hexagonal steel weld nuts, square weld nuts, weld round nuts, round nuts, head-hooking nuts, chain rollers, socket wrenches, bearing rings, HP oil manifold metal junction tubes, ignition plug metal pieces, and in-built metal expansions. We are also able to manufacture to the following standards: GB, DIN, JIS, ANSI/ASME/IFI, metric (M, MF), American (UNC, UNF), and British (BSW, BSF) screw thread. All of our products are manufactures from stainless steel and copper. We can also manufacture custom nuts and highly difficult non-standard articles using stainless steel, copper and carbon steel, or merely provide OEM-labeling processing services. We look forward to hearing from buyers at home and abroad, to build solid, long-lasting business relationships.