Hexagon nuts and screws, bolts, screws to match the use of the joint fastening parts.Nuts are fasteners with internal threads for use with bolts, and mechanical parts with internal threads for use with screws to transmit motion or power.

Nut is nut and bolt or screw fastening screw together to the function of parts, all production machinery must use an original. There are many types of nut, we have the common national standard, British standard, American standard, day mark nut. The nut according to different materials, the divided into carbon steel, high strength, stainless steel, plastic and so on several big types.But we only have carbon steel. According to the product properties corresponding to different standards of the state, is divided into ordinary, non-standard, (old), new gb gb, American, English, German standard. Thread range is divided into different specifications and size. Generally gb, Germany BiaoYong M (M8, M16, for example), thread system, with a score or # said specifications (e.g., 8 #, 10 #, 1/4, 3/8) fasteners, nut is mechanical equipment closely connected parts, through the inside of the thread, the same specifications nut and screw, can be connected together