Nema 34 Planetary Gearbox 6:1 Gear Head Speed Reducer for Nema34 Stepper Motor, <18 Arcmin 50Nm 3000RPM Gear Head Gear Box Reducer 14mm Input Shaft Geared Reduction (Nema34 6:1)

This was not the exact item delivered that's why I knocked it down. It shows the OKD86-6AG but unit received was a generic gear reducer about 6mm shorter. I'm still giving 3 stars because it does seem to work well but when you expect to get a specific part that fits into a specific machine and you have to modify it to make it fit it's a little frustrating. To be honest if they had the dimensions listed and correct part pictured I would purchase again. All I would do differently is cad the bracket correctly for the new dimensions so I don't have to modify the bracket next time. I hope that's fair, If you have a design that the NEMA34 can be 6mm closer with a shaft that's about 5mm longer this is a good replacement for the OKD86-6AG. GR is 6:1 FYI.