This threader is suitable for cutting, threading and reaming water, electricity or gas pipes and socket rounding in the working range of ＂—4＂. Besides having dexterous compact structure, artistic appearance, simple operation and high efficiency, it is also characterized by an automatic profiling device, a dependable clamping apparatus and advanced cooling oil system. Therefore, if adopting the threader, you would be sure to prolong the life of dies, protect the pipe from deformation and slipping, and obtain a high quality of projects and reduce labor intensity in pipe installation. It has been widely applied in equipment installing, Building industries and so on.