It is only compatiable with a Tr8x4 Leadscrew, pitch 2mm, the first 8 of Tr8 means it is for 8mm diameter Leadscrew. 8mm Lead means when drive by a stepper driver in Full Step mode, it moves 4mm per revolution. When combined with our Tr8x4 Leadscrew Anti-backlash Nut our line of threaded shaft stepper motors provide a level of control and stability that belt systems just can not match. True, you do pay more for these motor systems but when being 0.01 millimeters out means total failure it is worth the price. Compared with Anti-backlash Nut, brass nut is less expensive but easy to wear out.