Nuts and bolts
Nuts and bolts are mechanical parts, cylindrical threaded fasteners with nuts. A kind of fastener composed of head and screw (cylinder with external thread), which is used to connect two parts with through hole. This kind of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the nut bolt connection is a detachable connection.
There are many kinds of nut and bolt, including British standard, American Standard and Japanese standard. According to different materials, nuts are divided into carbon steel, high strength, stainless steel and plastic steel. According to different national standard numbers corresponding to product properties, nuts are divided into ordinary, non-standard, American, British and German standards.