In-feed type circular thread rolling dies are always helical, and there is very little part movement. The workpiece does not feed through thread rolling dies. Also can be putted on most brands of thread rolling machine, such as UM thread rolling machine, PMC thread rolling machine, SENY thread rolling machine, IC thread rolling machine, DL thread rolling machine, ORT thread rolling machine, LANDIS thread rolling machine, IZPE thread rolling machine, IMU thread rolling machine, LF thread rolling machine, MEGA thread rolling machine, JDY thread rolling machine, FDY thread rolling machine, REED RICO thread rolling machine, etc.