... main product are steel fasteners,for example,hex nut,flat washer,anchor bolt and so on. ... we have own factory,.it's producing nut,washer,bolt and other fasteners.the products standard ... the drawings and specifications.8)Usage:Hexagon nut,the material is carbon steel,they can ... machinery,equipment,vehicles,ships,railroad,bridge,building ,structure,tool,instrument, measuring appliance and thing above and ...