Threaded nipple is a commonly used accessory in industrial pipeline connections. It is mainly used for connecting and fixing pipeline systems. Threaded nipples are divided into two types: single-start threaded nipples and double-started threaded nipples. The single-start threaded nipple has an external thread on one end and a flat or beveled end on the other end. This kind of nipple is easy to install and disassemble, is suitable for various high-pressure fluid pipelines and equipment, can withstand high pressure, and has good sealing performance and durability. Double threaded nipples have external threads on both ends. This design makes it equally easy to install and disassemble, and is suitable for situations where both ends are required to be connected. Double-threaded nipples also have good sealing performance and pressure resistance, and are widely used in the connection of various pipelines and equipment.