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Machine Screw Jacks

Machine Screw Jacks

Worm Gear Machine Screw Jacks incorporate an alloy steel worm gear, which drives a high strength bronze drive sleeve. The worm shaft is supported on anti-friction tapered roller bearings with external seals to prevent loss of lubrication. The drive sleeve is supported on tapered roller or thrust bearings.

Overview

Machine Screw Jack Specifications:

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 Rate Load

(rpm)

Max Load at 1,750 rpm

(lb)

 Torque to Raise 1lb. (in-lb)

Lift Shaft Eff.

(%)

Tare Drag Torque

(in-lb)
1-MSJ 5:1 1 3⁄4 .200 .502 25 45 1⁄2 700 800 .0225 40 3
20:1 1 3⁄4 .200 .502 100 21 1⁄4 750 857 .0105 40 3

2-MSJ

 6:1 2 1 .250 .698 24 100 2 1,260 2,881 .0250 38 4
12:1 2 1 .250 .698 48 62 1 1⁄2 1,525 3,456 .0154 38 4
24:1 2 1 .250 .698 96 42 1⁄2 750 1,715 .0105 38 4
2R-MSJ 6:1 2 1 .250 .698 24 100 2 1,260 2,881 .0250 38 4
12:1 2 1 .250 .698 48 62 1 1⁄2 1,525 3,486 .0154 38 4
24:1 2 1 .250 .698 96 42 1⁄2 750 1,715 .0105 38 4
2.5-MSJ 6:1 2 1⁄2 1 .250 .698 24 126 2 1,000 2,858 .0252 38 5
12:1 2 1⁄2 1 .250 .698 48 74 1 1⁄2 1,277 3,650 .0148 38 5
24:1 2 1⁄2 1 .250 .698 96 53 1⁄2 594 1,699 .0106 38 5
5-MSJ 6:1 5 1 1⁄2 .375 1.066 16 376 3 500 2,873 .0376 40 10
24:1 5 1 1⁄2 .375 1.066 64 144 3⁄4 330 1,875 .0144 40 10
10-MSJ 8:1 10 2 .500 1.410 16 753 5 418 4,766 .0377 40 20
24:1 10 2 .500 1.410 48 384 1 1⁄2 246 2,813 .0192 40 20
15-MSJ 8:1 15 2 1⁄4 .500 1.684 16 1,221 5 258 4,424 .0407 37 20
24:1 15 2 1⁄4 .500 1.684 48 654 1 1⁄2 144 2,478 .0218 37 20
20-MSJ 8:1 20 2 1⁄2 .500 1.908 16 1,740 7 1⁄2 272 6,209 .0435 34 40
24:1 20 2 1⁄2 .500 1.908 48 873 2 1⁄2 180 4,130 .0218 34 40
30-MSJ 10 2⁄3:1 30 3 3⁄8 .667 2.652 16 2,710 11 256 8,764 .0432 34 50
32:1 30 3 3⁄8 .667 2.652 48 1,411 3 1⁄2 156 5,364 .0235 34 50
35-MSJ 10 2⁄3:1 35 3 3⁄4 .667 3.009 16 3,450 11 200 8,035 .0493 30 50
32:1 35 3 3⁄4 .667 3.009 48 1,800 3 1⁄2 122 4,904 .0257 30 50
50-MSJ 10 2⁄3:1 50 4 1⁄2 .667 3.782 16 5,555 16 181 10,382 .0555 28 100
32:1 50 4 1⁄2 .667 3.782 48 3,014 5 104 5,982 .0301 28 100
75-MSJ 10 2⁄3:1 75 5 .667 4.286 16 8,236 28 214 18,368 .0549 26 155
32:1 75 5 .667 4.286 48 3,780 9 150 12,862 .0252 26 155

 

Machine Screw Jack Highlights:

  • Acme screw
  • Self locking
  • Low noise (no rolling components)
  • Ideal for vertical and light loads
  • Pre-loaded nut assembly reduces backlash
  • Safe for static loads
  • Lower cost
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