1/4 to 350 ton capacity. Acme 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.
Machine Screw Actuators can be controlled accurately for positioning within thousandths of one inch.
Models featuring higher gear ratios are inherently load holding as long as the actuator is not subject to vibration
Since many actuators feature the same gear ratios different capacities can be used in the same application to lift unevenly distributed loads with uniform speeds.
All actuators are designed and built to be positive acting, for accurate response to motive power.
Performance Specifications |
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| 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 |
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| 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. | |||||||||||
Machine Screw Actuator Cut-Away Diagram |
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North America - EN
