Description Nema 23 to Nema 17 Motor Plate Adapter For sale  Nema 23 to Nema 17 adapter plate which allow to mount bigger Nema 23(57mm stepper ) motor in smaller, Nema 17(42mm stepper) mounting  space. It is possible to  use this bracket  in an opposite way  – to mount smaller, Nema 17 motor in  Nema 23 mounting  space , but in that case  smaller M3 threaded  holes must be  re-drilled with 3mm drill bit. PLEASE NOTE! Stepper motors visible on the photos ar not included. WHAT’S IN THE BOX? 1 piece of   stepper motor adapter plate.