Numeric Ratio Jacks Quick Reference

MODEL Gear Ratio Capacity (tons) Lifting Screw Dia.(in) Screw Lead (in) Root Dia. (in) Turns of Worm for 1" travel Max input Torque (in-lb) Max Input (hp) Max Worm Speed at Rated Load (rpm) Max Load at 1,750 rpm (lb) Torque to Rase 1 lb. (in-lb) Tare Drag Torque (in-lb)
MJAB-100 20:1 12 0.625 0.200 0.377 100 8.7 0.17 1,210 690 0.009 1.0
1AB-MSJ 20:1 1 0.750 0.200 0.502 100 21 0.26 750 855 0.011 3.0
2AB-MSJ 25:1 2 1.000 0.250 0.698 100 41 0.51 780 1,780 0.010 4.0
2.5AB-MSJ 25:1 2.5 1.000 0.250 0.698 100 51 0.51 625 1,785 0.010 5.0
5AB-MSJ 25:1 5 1.500 0.250 1.196 100 116 0.67 365 2,085 0.012 10.0
10AB-MSJ 25:1 10 2.000 0.250 1.694 100 309 1.38 282 3,225 0.015 20.0
15AB-MSJ 25:1 15 2.250 0.250 1.944 100 505 1.33 165 2,835 0.017 20.0
20AB-MSJ 25:1 20 2.500 0.250 2.193 100 712 2.32 205 4,690 0.018 40.0

ActionJac™ Anti-backlash Machine Screw Jacks may be ordered with worm gear sets and lift shafts specifically designed to provide 0.01 inch of travel for each revolution of the input shaft. Referred to as "Numeric Ratio" jack, these units are usually manually operated to precisely position machine components such as end stops or calendar rolls.

These jacks can be supplied with handwheels and counters (see ActionJac™ accessories section) to provide immediate positional feedback to an operator. ActionJac™ Numeric Ratio Anti-backlash Machine Screw Jacks retain all the performance characteristics of standard machine screw jacks.

Figure 1