Inch Cubic 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 Raise 1 lb (in-lb) Tare Drag Torque (in-lb) Back Drive Holding Torque
0.5C-BSJ 5:1 12 58 .200 .500 25 9.5 13 1,800 1,000 .0095 1 1.0
20:1 12 58 .200 .500 100 4.0 16 1,800 1,000 .0040 1 .25
0.5CHL-BSJ 5:1 12 58 .500 .500 10 24.2 13 868 496 .0242 1 2
20:1 12 58 .500 .500 40 10.2 16 1,030 588 .0102 1 1
1C-BSJ 5:1 1 34 .200 .602 25 19 12 1,660 1,895 .0095 3 1.5
20:1 1 34 .500 .602 100 9 14 1,750 2,000 .0045 3 .50
1CHL-BSJ 5:1 1 34 .500 .602 10 48.2 12 654 747 .0241 3 3.5
20:1 1 34 .500 .602 40 9 14 691 790 .0114 3 1.5
MJC-20 5:1 .5 12 .250 .332 20 19 13 1,090 631 .019 - -
MJC-25 5:1 .5 58 .200 .377 25 21 13 1,040 571 .021 - -
MJC-40 5:1 .5 58 .125 .457 40 17 13 1,260 706 .017 - -
MJC-50 5:1 .5 12 .100 .359 50 14 13 1,560 857 .014 - -
MJC-80 20:1 .5 12 .250 .332 80 8 16 1,310 750 .008 - -
MJC-100 20:1 .5 58 .200 .377 100 9 16 1,210 667 .009 - -
MJC-160 20:1 .5 58 .125 .457 160 7 16 1,500 857 .007 - -
MJC-200 20:1 .5 12 .100 .359 200 6 16 1,800 1,000 .006 - -
1C-MSJ 5:1 1 34 .200 .502 25 45 12 700 800 .0225 3 -
20:1 1 34 .200 .502 100 21 14 750 857 .0105 3 -

NOTES:

  1. The recommended maximum speed is 1,800 rpm provided that the recommended horsepower and temperature are not exceeded.
  2. Input torque is shown as torque to lift one pound of load. Starting torque is 100% greater than torque shown for Machine Screw Jacks and 50% greater than torque shown for Ball Screw Jacks. Tare drag torque should be added for all loads.
  3. Maximum allowable horsepower ratings are based on a 25% duty cycle. For operation at higher duty cycles or repeated use over any segment of the total travel, temperature must be monitored and remain less than 200°F.
  4. Overload capacity of the Cubic Jack is as follows: 10% for dynamic loads, 30% for static loads.
  5. Cubic Machine Screw Jacks having gear ratios of 20:1 are self-locking and will hold loads without backdriving in the absence of vibration. All other ratios may require a brake to prevent backdriving.
  6. All units are suitable for intermittent operation providing that the housing temperature including ambient is not lower than -20°F or higher than +200°F. Factory supplied grease in standard units will operate in this range. For higher or lower operating temperature ranges consult Nook Industries.
  7. Accessories such as boots, top plates and clevises are available.
  8. Catalog dimensions are representative only and are subject to change without notice. For construction, use only certified prints.
  9. Units are not to be used as personnel support or movement.
  10. End-of-travel stops are not provided.
  11. Tare drag torque need only be added if operating under 25% rated load.
  12. Horsepower per jack = Torque to raise 1 pound × Number of pounds to be raised × rpm
    63,025
  13. Measurements are for non-keyed units. See individual jack pages in our Worm Gear Screw Jacks Catalog for keyed jack info.
Figure 1