SeriesConstruction Type Ratio Backlash (arc-minutes) EfficiencyWeight
(lbs)
Maximum Tested
Input RPM
Standard Low
NEMA 17 Series Single Stage 3:1 to 10:1 10 7 90% 1.96 5000
Double Stage 16:1 to 100:1 14 11
85% 2.44 5000
NEMA 23 Series Single Stage 3:1 to 10:1 10 7 90% 4.87
5000
Double Stage 16:1 to 100:1 14 11
85% 6.00 5000
NEMA 34 Series Single Stage 3:1 to 10:1 10 7
90% 11.89 5000
Double Stage 16:1 to 100:1 14 11
85% 14.62
5000