Nowadays, with the continuous development of society, the output of oil field mining has increased, and the tools used in mining technology have become more and more abundant. In order to meet the increasing oil production, there are more and more oil transportation tools. Commonly used casing and tubing , seamless steel pipes, etc., the pup joint industry is also developing continuously. In oil production, the use of Pup joints is very important for oil. Generally speaking, Pup joint is a very important industrial pipe connection accessory and is a commonly used type of spare parts in industrial pipeline connection. There are many types, the most common ones are threaded puff joints, which are divided into double-ended external wires, single-ended external wires, and flat-ended external wires. In addition, there are also flange-connected pup joints.