Jack Numeric 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 @ 1,750 rpm (lb) | Torque to Rase 1 lb. (in-lb) | Tare Drag Torque (in-lb) |
| MJAB-100 | 20:1 | 1⁄2 | 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.