Compared with other connection methods, the pipe thread is popular among users because of its simple structure and convenient use, especially for pipe systems with medium and small sizes. Water and gas lines for daily use are the best examples of pipe joints. The number of pipe threads is second only to ordinary threads, and should generally be produced according to standards. In recent years, China has promulgated three national standards for four types of pipe thread, which basically meet the needs of various domestic industries. According to the reaction in the implementation of various standards, it is necessary to explain the following issues. I. About the dimension of the pipe thread Unit system and size code The unit of length specified by the International System of Units is meters, which means that all countries in the world are required to measure in metric units. From this point of view, I
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