SeriesConstruction Type Ratio Backlash (arc-minutes) EfficiencyWeight
(lbs)
Maximum Tested
Input RPM
Standard Low
NEMA 17 Series Single Stage 3:1 to 10:1 6 3 90% 1.14 5000
Double Stage 16:1 to 100:1 10 7 85% 1.62 5000
NEMA 23 Series Single Stage 3:1 to 10:1 6 3 90% 2.29 5000
Double Stage 16:1 to 100:1 10 7 85% 3.42 5000
NEMA 34 Series Single Stage 3:1 to 10:1 6 3 90% 5.67 5000
Double Stage 16:1 to 100:1 10 7 85% 8.41 5000