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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.
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 |
Not finding the screw jack you're looking for? Contact us for a custom solution.
Family
Size
Type
Ratio
Screw Type
Stroke
Screw End
End Fitting
Bellows
Nut
Special Features
Screw Dimensions
Rotating Screw - R
The rotary motion of precision worm gearing (worm shaft and internally threaded worm wheel) is converted into axial linear motion of the screw, which travels through the gear box housing. The load is attached to the end of the screw.
Rotating Nut, with or without anti-rotation (axial translating Screw) - N or V
Driven by a precision worm gearing (worm shaft and worm wheel), the rotary motion of the screw is translated into linear motion of the travelling nut on the screw.
High Speed - One full turn of the worm shaft leads to a stroke of one millimeter.
Low Speed - One full turn of the worm shaft leads to a stroke of 0.25 mm.
The stroke length of the screw jack.
Choose from a standard screw end or a custom end.
Bellow cover for protection against external influences. Suitable for horizontal or vertical installation.
Prevents the screw from being removed from the jack gearbox. Fitted as standard on ball screw versions N and V. Optionally available for screw jacks with trapezoidal screws. The stop collar cannot be used as a fixed stop.
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