Ball Screw 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) Backdrive Holding Torque (ft-lb)
0.5-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
0.5HL-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
1-BSJ 5:1 1 34 .200 .602 25 19 12 1,660 1,895 .0095 3 1.5
20:1 1 34 .200 .602 100 9 14 1,750 2,000 .0045 3 .50
1HL-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
2-BSJ 6:1 2 1 .250 .820 24 40 2 1,800 4,000 .0100 4 3
12:1 2 1 .250 .820 48 26 1 12 1,800 4,000 .0064 4 1.5
24:1 2 1 .250 .820 96 17 12 1,800 4,000 .0043 4 1
2R-BSJ 6:1 2 1 .250 .820 24 40 2 1,800 4,000 .0100 4 3
12:1 2 1 .250 .820 48 26 1 12 1,800 4,000 .0064 4 1.5
24:1 2 1 .250 .820 96 17 12 1,800 4,000 .0043 4 1
2.5-BSJ 6:1 2 12 1 .250 .820 24 51 2 1,800 5,000 .0102 5 4
12:1 2 12 1 .250 .820 48 31 1 12 1,800 5,000 .0061 5 2
24:1 2 12 1 .250 .820 96 21 12 1,500 4,287 .0042 5 1.5
2.5HL-BSJ 6:1 2 12 1 1.00 .820 6 202 2 624 1,783 .0404 5 14
12:1 2 12 1 1.00 .820 12 122 1 12 775 2,214 .0244 5 6
24:1 2 12 1 1.00 .820 24 85 12 371 1,059 .0170 5 5
3-BSJ 6:1 3 1 1164 .413 .870 14.53 100 2 1,260 4,313 .0167 6 6
24:1 3 1 1164 .413 .870 58.10 42 12 750 2,572 .0070 6 2
5-BSJ 6:1 5 1 12 .473 1.140 12.66 183 3 1,033 5,904 .0183 10 14
24:1 5 1 12 .473 1.140 50.66 73 34 647 3,700 .0073 10 5
5HL-BSJ 6:1 5 1 12 1.00 1.140 6 387 3 488 2,792 .0387 10 30
24:1 5 1 12 1.00 1.140 24 153 34 308 1,765 .0153 10 10
10-BSJ 8:1 10 1 12 .473 1.140 16.88 302 5 1,043 11,925 .0151 20 13
24:1 10 1 12 .473 1.140 50.66 153 1 12 618 7,016 .0077 20 4
10HL-BSJ 8:1 10 1 12 1.00 1.140 8 638 5 494 5,645 .0319 20 26
24:1 10 1 12 1.00 1.140 24 323 1 12 293 3,335 .0162 20 6
20-BSJ 8:1 20 2 14 .50 1.850 16 626 7 12 755 17,204 .0157 40 27
24:1 20 2 14 .50 1.850 48 314 2 12 501 11,397 .0079 40 7
20HL-BSJ 8:1 20 2 14 1.00 1.850 8 1,253 7 12 377 8,629 .0313 40 54
24:1 20 2 14 1.00 1.850 24 628 2 12 251 5,737 .0157 40 13
30-BSJ 10 23:1 30 3 .66 2.480 16.16 969 11 715 24,515 .0162 60 21
32:1 30 3 .66 2.480 48.48 503 3 12 438 15,006 .0084 60 5
30HL-BSJ 10 23:1 30 3 1.5 2.480 7.11 2,292 11 315 10,794 .0367 60 67
32:1 30 3 1.5 2.480 21.33 1,144 3 12 193 6,600 .0191 60 15
50-BSJ 10 23:1 50 4 1.0 3.338 10.66 2,560 16 394 22,509 .0256 90 75
32:1 50 4 1.0 3.338 32 1,390 5 227 12,954 .0139 90 10
75-BSJ 10 23:1 75 4 1.0 3.338 10.66 3,660 28 482 41,328 .0244 155 110
32:1 75 4 1.0 3.338 32 1,680 9 338 28,970 .0112 155 25
100-BSJ 10 23:1 100 4 1.0 3.338 10.66 4,880 32 413 47,232 .0244 205 152
32:1 100 4 1.0 3.338 32 2,760 12 12 285 32,621 .0138 205 25
NOTES:

  1. The recommended maximum speed is 3,000 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 50% greater than torque shown. For loads less than 25% of rated loads add tare drag torque.
  3. Maximum (allowable) horsepower ratings are based on a 35% 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 Ball Screw Jack is as follows: 10% for dynamic loads, 30% for static loads.
  5. All Ball Screw Jacks can backdrive and require some means of holding the load, such as a brake on the motor. The product specification pages of our Worm Gear Screw Jacks Catalog show holding torque values. Holding torque represents the amount of input torque required to restrain the load and does not indicate recommended brake size to bring the dynamic load to a stop.
  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, limit switches, 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 for the purpose of 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. Starting Torque is 50% greater than torque shown.
  14. Measurements listed are for non-keyed jacks. See individual jack pages for keyed jack info.
Figure 1