Tapered bolts are mechanical fittings for sealing liquids and gases. Tapered bolt generally refers to tapered thread, and its tooth shape is triangular, which mainly depends on the deformation of the tooth to ensure the tightness of the thread pair, and is mostly used for pipe fittings. The taper of tapered pipe thread is 1: 16, because this feature makes the raw material tape wound on the thread more evenly distributed on the thread and has better sealing performance. At the same time, the iron pipe used for tapered pipe thread has thick wall and high pressure resistance, so this thread is widely used for sealing liquid and gas. Bolts refer to mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (a cylinder with external threads), which needs to cooperate with a nut to firmly connect two parts with through holes. ?