The nut is a nut, bolt or screw screwed together the parts used to play a fastening role must be a component of all manufacturing machinery. The nut of a wide range of common GB, German standard, British standard, American standard, the date of the subject nut. Nut according to the different materials, is divided into several major types of carbon steel, high-strength, stainless steel, steel, etc.. According to the product attributes corresponding to different national standards No. divided into ordinary, non-standard, GB (old), GB, U.S., British, German standard. Different sizes, the threaded ranging divided into different specifications Hex Nylon Insert Nut, Hex Slot Nut, Hex coupling Nut, Hex flange nut, Wheel Nut, Wheel Nut, DIN6331Hex Flange Nuts