2-to-100-ton load capacity. Stainless Steel Screw Jacks offer positive mechanical action, precise positioning, and uniform lifting speeds. Standard configurations include upright or inverted units with translating or rotating lifting screws, and top plate, threaded, or clevis ends. Duff-Norton offers a complete line of both standard and custom engineered machine screw actuators for applications up to 350 tons.
From 2 ton to 350 ton models.
Sealed gear cavity keeps water and other contaminants out.
Upright and inverted rotating screw models with traveling nut available.
Available with keyed lifting screws for translating screw models.
Can be retrofitted into applications where Duff-Norton non-stainless steel actuators have been previously used.
Closed heights, lifting screw ends, worm shaft extensions, lifting screw thread pitches, materials, stop nut, bellows boot.
Performance Specifications |
|---|
| Performance Table Instructions When reviewing and Duff-Norton Actuator Performance Specification Table, as part of the process of selecting the best-suited actuator for your application, there are several important worm-gear ratios to consider. Standard Ratio - is frequently chosen when higher speeds and efficiency ratings are desired. Optional Ratio - is frequently chosen when the application requires higher lifting capacities, lower speeds, or to ease the use of a handwheel. Numeric Ratio - is frequently chosen for applications requiring fine adjustments, higher lifting capacities, lowerspeeds, the easy use of a handwheel, self locking applications, and also offers the benefit of an even number of worm input turns per inch of stroke. |
Machine Screw Actuator Stainless Steel |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Capacity (tons) - 17-4PH Worn | 2 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 50 | 100 | |
| Capacity (tons) - 316 SSWorn | 0.67 | 1.66 | 3.33 | 5.00 | 6.66 | 8.33 | 9.9 | 11.66 | 16.66 | 33.33 | |
| Lifting Screw | Diameter (in) | 1 | 1-1/2 | 2 | 1-1/4 | 2-1/2 | 3 | 3 | 3-3/4 | 4-1/2 | 6 |
| Pitch (Std. & Opt.) | 0.250 | 0.375 | 0.500 | 0.500 | 0.500 | 0.666 | 0.666 | 0.666 | 0.666 | 0.750 | |
| Pitch (Numerical) | — | 0.250 | 0.250 | 0.250 | 0.250 | 0.320 | 0.320 | 0.320 | 0.320 | — | |
| Type | ACME | ACME | ACME | ACME | ACME | ACME | ACME | ACME | Mod.Sq. | Mod. Sq. | |
| Worm Gear Ratios | Standard | 6:1 | 6:1 | 8:1 | 8:1 | 8:1 | 10-2/3:1 | 10-2/3:1 | 10-2/3:1 | 10-2/3:1 | 12:1 |
| Optional No. 1 | 24:1 | 24:1 | 24:1 | 24:1 | 24:1 | 32:1 | 32:1 | 32:1 | 32:1 | 36:1 | |
| Optional No. 2 | 12:1 | 12:1 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 25:1 | 25:1 | 25:1 | 25:1 | 25:1 | 32:1 | 32:1 | 32:1 | 32:1 | — | |
| Turns of Worm for 1 inch Stroke | Standard | 24 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 |
| Optional No. 1 | 100 | 67 | 50 | 50 | 50 | 48 | 48 | 48 | 48 | 48 | |
| Optional No. 2 | 50 | 33 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
| Worm Torque at No Load (in-lb) | Standard | 5 | 10 | 20 | 20 | 30 | 40 | 40 | 50 | 100 | 200 |
| Optional No. 1 | 5 | 10 | 20 | 20 | 30 | 40 | 40 | 50 | 100 | 200 | |
| Optional No. 2 | 5 | 10 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 5 | 10 | 20 | 20 | 30 | 40 | 40 | 50 | 100 | 200 | |
| Maximum Horsepower per Actuator | Standard | 2 | 4 | 5 | 5 | 5 | 8 | 8 | 8 | 15 | 25 |
| Optional No. 1 | 1/2 | 3/4 | 1-1/2 | 1-1/2 | 1-1/2 | 1-1/2 | 1-1/2 | 1-1/2 | 6 | 11 | |
| Optional No. 2 | 3/4 | 2 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 1/2 | 3/4 | 1-1/2 | 1-1/2 | 1-1/2 | 1-1/2 | 1-1/2 | 1-1/2 | 6 | 11 | |
| Worm Torque at Full Load* (in-lb) 17-4PH Worm | Standard | 120 | 450 | 750 | 1430 | 2050 | 2700 | 2640 | 4000 | 7500 | 16000 |
| Optional No. 1 | 50 | 185 | 400 | 820 | 1170 | 1700 | 1685 | 2400 | 4200 | 8600 | |
| Optional No. 2 | 75 | 275 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 48 | 175 | 370 | 640 | 925 | 1500 | 1800 | 2411 | 4040 | — | |
| Worm Torque at Full Load* (in-lb) 316SS Worm | Standard | 42 | 150 | 253 | 471 | 675 | 926 | 940 | 1366 | 2566 | 5466 |
| Optional No. 1 | 19 | 66 | 141 | 276 | 394 | 593 | 600 | 833 | 1466 | 3000 | |
| Optional No. 2 | 27 | 95 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 25 | 57 | 67 | 109 | 144 | 336 | 635 | 350 | 619 | — | |
| Efficiency Rating (%) - 17-4PH Worm | Standard | 22.1 | 22.1 | 26.5 | 20.9 | 22.0 | 22.4 | 22.4 | 17.4 | 13.3 | 12.4 |
| Optional No. 1 | 13.3 | 9.1 | 16.6 | 12.1 | 12.8 | 11.8 | 11.8 | 9.7 | 7.9 | 7.7 | |
| Optional No. 2 | 17.7 | 18.1 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 13.3 | 9.1 | 8.6 | 7.5 | 6.9 | 5.3 | 5.3 | 4.6 | 3.9 | — | |
| Efficiency Rating (%) - 316SS Worm | Standard | 20.3 | 21.1 | 25.1 | 20.3 | 18.8 | 17.9 | 17.9 | 17.0 | 12.9 | 12.1 |
| Optional No. 1 | 10.9 | 12.0 | 15.0 | 11.5 | 10.7 | 9.3 | 9.3 | 9.3 | 7.5 | 7.4 | |
| Optional No. 2 | 15.5 | 16.8 | — | — | — | — | — | — | — | — | |
| Numeric Ratio | 10.9 | 8.0 | 7.5 | 5.8 | 5.4 | 4.5 | 5.0 | 4.5 | 3.6 | — | |
| Key Torque (in-lb) - 17-4PH Worm | Std. & Opt. | 460 | 1750 | 4700 | 7580 | 10625 | 14000 | 16800 | 26500 | 47110 | 118200 |
| Numeric Ratio | 460 | 1599 | 4077 | 6645 | 9369 | 11474 | 13770 | 18561 | 30970 | — | |
| Key Torque (in-lb) - 316SS Worm | Std. & Opt. | 153 | 581 | 1565 | 2527 | 3538 | 4665 | 5600 | 8828 | 15697 | 39396 |
| Numeric Ratio | 211 | 460 | 551 | 959 | 1199 | 2328 | 2800 | 2358 | 4087 | — | |
| Weight with 6 inch Stroke (Raise) (lb) | 17 | 35 | 52 | 66 | 93 | 160 | 160 | 240 | 410 | 1200 | |
| Weight per additional 1 inch Stroke (Raise) (lb) | 0.3 | 0.9 | 1.4 | 1.5 | 2.6 | 2.5 | 2.5 | 3.7 | 5.5 | 9.0 | |
| Note: For loads from 25% to 100% of actuator capacity, torque requirements are approximately proportional to the load. Contact Duff-Norton Customer Service for motorized performance. | |||||||||||
Industrial screw jacks are used to lift, position (push, pull, tilt, roll, etc.) and support all kinds of loads. Some applications where our screw jacks have been used include plastics machinery, beverage bottling systems, aircraft assembly and paper production.
Duff-Norton’s collection of screw jacks range from mini screw jacks supporting up to 1,000 pounds to acme screw jacks with a capacity up to 350 tons and everything in between. Learn about our machine and ball screw jacks.
Performance Table Instructions
When reviewing and Duff-Norton Actuator Performance Specification Table, as part of the process of selecting the best-suited actuator for your application, there are several important worm-gear ratios to consider.
Standard Ratio - is frequently chosen when higher speeds and efficiency ratings are desired.
Optional Ratio - is frequently chosen when the application requires higher lifting capacities, lower speeds, or to ease the use of a handwheel.
Numeric Ratio - is frequently chosen for applications requiring fine adjustments, higher lifting capacities, lowerspeeds, the easy use of a handwheel, self locking applications, and also offers the benefit of an even number of worm input turns per inch of stroke.
Performance Specifications - Machine Screw Actuator Stainless Steel |
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Capacity (tons) - 17-4PH Worn |
2 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
50 |
100 |
|
|
Capacity (tons) - 316 SSWorn |
0.67 |
1.66 |
3.33 |
5.00 |
6.66 |
8.33 |
9.9 |
11.66 |
16.66 |
33.33 |
|
|
Lifting Screw |
Diameter (in) |
1 |
1-1/2 |
2 |
1-1/4 |
2-1/2 |
3 |
3 |
3-3/4 |
4-1/2 |
6 |
|
Pitch (Std. & Opt.) |
0.250 |
0.375 |
0.500 |
0.500 |
0.500 |
0.666 |
0.666 |
0.666 |
0.666 |
0.750 |
|
|
Pitch (Numerical) |
— |
0.250 |
0.250 |
0.250 |
0.250 |
0.320 |
0.320 |
0.320 |
0.320 |
— |
|
|
Type |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
ACME |
Mod. Sq. |
Mod. Sq. |
|
|
Worm Gear Ratios |
Standard |
6:1 |
6:1 |
8:1 |
8:1 |
8:1 |
10-2/3:1 |
10-2/3:1 |
10-2/3:1 |
10-2/3:1 |
12:1 |
|
Optional No. 1 |
24:1 |
24:1 |
24:1 |
24:1 |
24:1 |
32:1 |
32:1 |
32:1 |
32:1 |
36:1 |
|
|
Optional No. 2 |
12:1 |
12:1 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
25:1 |
25:1 |
25:1 |
25:1 |
25:1 |
32:1 |
32:1 |
32:1 |
32:1 |
— |
|
|
Turns of Worm for 1 inch Stroke |
Standard |
24 |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
16 |
|
Optional No. 1 |
100 |
67 |
50 |
50 |
50 |
48 |
48 |
48 |
48 |
48 |
|
|
Optional No. 2 |
50 |
33 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
|
|
Worm Torque at No Load (in-lb) |
Standard |
5 |
10 |
20 |
20 |
30 |
40 |
40 |
50 |
100 |
200 |
|
Optional No. 1 |
5 |
10 |
20 |
20 |
30 |
40 |
40 |
50 |
100 |
200 |
|
|
Optional No. 2 |
5 |
10 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
5 |
10 |
20 |
20 |
30 |
40 |
40 |
50 |
100 |
200 |
|
|
Maximum Horsepower per Actuator |
Standard |
2 |
4 |
5 |
5 |
5 |
8 |
8 |
8 |
15 |
25 |
|
Optional No. 1 |
1/2 |
3/4 |
1-1/2 |
1-1/2 |
1-1/2 |
1-1/2 |
1-1/2 |
1-1/2 |
6 |
11 |
|
|
Optional No. 2 |
3/4 |
2 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
1/2 |
3/4 |
1-1/2 |
1-1/2 |
1-1/2 |
1-1/2 |
1-1/2 |
1-1/2 |
6 |
11 |
|
|
Worm Torque at Full Load* (in-lb) 17-4PH Worm |
Standard |
120 |
450 |
750 |
1430 |
2050 |
2700 |
2640 |
4000 |
7500 |
16000 |
|
Optional No. 1 |
50 |
185 |
400 |
820 |
1170 |
1700 |
1685 |
2400 |
4200 |
8600 |
|
|
Optional No. 2 |
75 |
275 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
48 |
175 |
370 |
640 |
925 |
1500 |
1800 |
2411 |
4040 |
— |
|
|
Worm Torque at Full Load* (in-lb) 316SS Worm |
Standard |
42 |
150 |
253 |
471 |
675 |
926 |
940 |
1366 |
2566 |
5466 |
|
Optional No. 1 |
19 |
66 |
141 |
276 |
394 |
593 |
600 |
833 |
1466 |
3000 |
|
|
Optional No. 2 |
27 |
95 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
25 |
57 |
67 |
109 |
144 |
336 |
635 |
350 |
619 |
— |
|
|
Efficiency Rating (%) - 17-4PH Worm |
Standard |
22.1 |
22.1 |
26.5 |
20.9 |
22.0 |
22.4 |
22.4 |
17.4 |
13.3 |
12.4 |
|
Optional No. 1 |
13.3 |
9.1 |
16.6 |
12.1 |
12.8 |
11.8 |
11.8 |
9.7 |
7.9 |
7.7 |
|
|
Optional No. 2 |
17.7 |
18.1 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
13.3 |
9.1 |
8.6 |
7.5 |
6.9 |
5.3 |
5.3 |
4.6 |
3.9 |
— |
|
|
Efficiency Rating (%) - 316SS Worm |
Standard |
20.3 |
21.1 |
25.1 |
20.3 |
18.8 |
17.9 |
17.9 |
17.0 |
12.9 |
12.1 |
|
Optional No. 1 |
10.9 |
12.0 |
15.0 |
11.5 |
10.7 |
9.3 |
9.3 |
9.3 |
7.5 |
7.4 |
|
|
Optional No. 2 |
15.5 |
16.8 |
— |
— |
— |
— |
— |
— |
— |
— |
|
|
Numeric Ratio |
10.9 |
8.0 |
7.5 |
5.8 |
5.4 |
4.5 |
5.0 |
4.5 |
3.6 |
— |
|
|
Key Torque (in-lb) - 17-4PH Worm |
Std. & Opt. |
460 |
1750 |
4700 |
7580 |
10625 |
14000 |
16800 |
26500 |
47110 |
118200 |
|
Numeric Ratio |
460 |
1599 |
4077 |
6645 |
9369 |
11474 |
13770 |
18561 |
30970 |
— |
|
|
Key Torque (in-lb) - 316SS Worm |
Std. & Opt. |
153 |
581 |
1565 |
2527 |
3538 |
4665 |
5600 |
8828 |
15697 |
39396 |
|
Numeric Ratio |
211 |
460 |
551 |
959 |
1199 |
2328 |
2800 |
2358 |
4087 |
— |
|
|
Weight with 6 inch Stroke (Raise) (lb) |
17 |
35 |
52 |
66 |
93 |
160 |
160 |
240 |
410 |
1200 |
|
|
Weight per additional 1 inch Stroke (Raise) (lb) |
0.3 |
0.9 |
1.4 |
1.5 |
2.6 |
2.5 |
2.5 |
3.7 |
5.5 |
9.0 |
|
|
Note: For loads from 25% to 100% of actuator capacity, torque requirements are approximately proportional to the load. Contact Duff-Norton Customer Service for motorized performance. |
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Stainless Steel Actuator Cut-Away Diagram |
|
|---|---|
2 to 100 Ton Capacity
|
|
North America - EN
