SeriesConstruction Type Ratio Backlash (arc-minutes) EfficiencyWeight
(lbs)
Maximum Tested
Input RPM
Standard Low
NEMA 17 Series Single Stage 4:1 to 10:1 12
6 95% 0.59 5000
Double Stage 16:1 to 100:1 16 10 90% 0.88 5000
NEMA 23 Series Single Stage 4:1 to 10:1 12 6 95% 1.55 5000
Double Stage 16:1 to 100:1 16 10 90% 1.95 5000
NEMA 34 Series Single Stage 4:1 to 10:1 12 6 95% 3.67 5000
Double Stage 16:1 to 100:1 16 10 90% 5.10 5000