Die nut is equivalent to a high hardness, a few holes around the chip hole, both ends of the screw in the grinding cutting cone. Die by shape and purpose into the round die, die, die angle and six square tube die. Among them, the circular tooth is the most widely used, and the specifications range from M0.25 to M68 mm. When the thread processing the size out of tolerance, can die adjustment on the groove cut, in order to adjust the thread diameter. The die can be installed in diestock by manual thread processing, also can be mounted on the die holder inMachine toolUp use. Thread precision machined die is low, but due to the simple structure and convenient use, in single and small batch production and repair is still widely used in die.The set-up is used in Yapu type plate over the thread cutting precision, because it is adjustable, so it can be matched with the user to adjust the use of thread cutting conditions. Set type circular dies including metric, inch size tooth teeth and unf.