| 摘要 |
The present invention relates to a roll tap to process a female screw by performing a plastic process to a material and, more specifically, relates to a roll tap included in a front end of a fixed shaft firmly fixated to a tool having at least one spiral process part to process the screw to cut a spiral process part worn due to the spiral process; thereby allowing an unused spiral processing part to be used. The roll tap to process the spiral on an inner circumference of the material through plastic processing comprises the spiral processing part having at least two spiral processing taps to process the spiral, extended from a front end of a fixing part forming the roll tap. According to the present invention, economic load upon a user is able to be reduced. |
