- Home/
- Lifting Equipment/
- Screwjacks, Linear Actuators, Rotary Unions and ACME Ball Screws and Nuts/
- Duff Norton Screwjacks/
- Machine Screwjack Actuator, 100t to 250t
Machine Screwjack Actuator, 100t to 250t
Screwjack Actuator.
MSAT-4049
Machine Screwjack Actuators
These screw actuators offer a positive mechanical action, precise positioning and uniform lifting speeds.
The standard configurations include, upright or inverted units with translating or rotating lifting screws, with top plates, threaded or clevis end fittings.
They can be controlled accurately for positioning within thousands of one inch.
Unevenly distributed loads can be lifted with uniform speeds.
All actuators are designed and built to be positive acting, giving accurate response to motive power.
Top Plate
Clevis End
Threaded End
Translating Machine Screwjack Actuators - 100, 150 and 250 ton.
* For loads of from 25% to 100% of Actuator load rating. Torque requirements are approximately proportional to the load.
** Closed heights are for standard upright top plate models and may vary with different screw ends, inverted models, or when bellows boot is used.
| Actuator Number | Rated Load (ton) | Diameter of Lifting Screw (in) | Closed Height** (in) | Base Size (in) | Worm Gear Ratios | Turns of Worm for 1" Raise | Maximum HP Per Actuator | Torque at Full Load (in-lbs) | Actuator Efficiency Rating (%) | Weight with Base Raise of 6" (lb) | Weight for Each Additional 1" Raise (lb) | ||||||
| Upright | Inverted | Standard Ratio | Optional | Standard Ratio | Optional | Standard Ratio | Optional | Standard Ratio | Optional | Standard Ratio | Optional | ||||||
| 9099 | 9098 | 100 | 6 .750 Pitch Square | 24 | 20.75 x 24.5 | 12:1 | 36:1 | 16 | 48 | 25 | 11 | 16,000 | 8,600 | 13.0 | 8 | 1,200 | 9 |
| 18150 | 18149 | 150 |
7, 1,000 Pitch Square |
24 | 20.75 x 24.5 | 12:1 | 36:1 | 12 | 36 | 25 | 11 | 28,100 | 15,500 | 14.1 | 8.6 | 1,350 | 12.6 |
| 2250 | 2249 | 250 | 9, 1000 Pitch Square | 30 | 29.5 x 41 | 50:1 | - | 50 | - | 35 | - | 20,000 | - | 8.0 | - | 2,700 | 23 |
Anti-Backlash Actuators
| Actuator Number | Rated Load (ton) | Torque at Full Load (in-lbs) | Actuator Efficiency Rating (%) | Closed Height (in) | Weight with Base Raise of 6" (lb) | ||
| Standard Ratio | Optional | Standard Ratio | Optional | ||||
| 9499 | 100 | 17600 | 9460 | 11.7 | 7.2 | 26.5 | 1325 |
| 48150 | 150 | 30900 | 17050 | 12.7 | 7.7 | 26.25 | 1475 |
| 2250 | 250 | 22000 | - | 7.2 | - | 36.6 | 2975 |
Maximum Free Vertical Movement of Actuator Lifting Screw
| Actuator Model | Free Movement (in) |
| 100-ton | .18 |
| 150-ton | .23 |
| 250-ton | .23 |
Maximum Free Rotational Movement of Actuator Worm Shaft
| Actuator | Model/Ratio | Free Movement (degrees) |
| 100-ton |
12:1 36:1 |
20 45 |
| 150-ton |
12:1 36:1 |
20 45 |
| 250-ton | 50:1 | 45 |
Minimum Gear Internal Thread Thickness at ID Land
| Actuator Model |
Minimum Gear Thread Thickness (in) |
| 100-ton | .18 |
| 150-ton | .23 |
| 250-ton | .23 |
Minimum Gear Tooth Thickness at OD Land at Centre
| Actuator Model | Minimum Gear Tooth Thickness (in) |
| 100-ton | .14 |
| 150-ton | .14 |
| 250-ton | .18 |
Translating Machine Screw Actuator Parts List - 100t, 150t and 250t.
| Index Number | Part Name | Quantity |
| 1 | Bushing | 1 |
| 2 | Base Plate | 1 |
| 3 | Shell, Actuator | 1 |
| 4 | Pipe, Bottom | 1 |
| 5 | Screw, Lifting | 1 |
| 6a | Worm Gear | 1 |
| 6b | Worm Gear and anti-backlash nut assembly (Mfg'd and sold in sets only) | 1 |
| 7 | Bearing, Bottom Load | 1 |
| 8 | Bearing, Top Load | 1 |
| 9 | Screw, Cap | 12 |
| 10 | Washer, Lock | 12 |
| 11 | Flange, Worm | 2 |
| 12 | Shim, Flange | 2 |
| 13 | Seal, Oil | 2 |
| 14 | Worm | 1 |
| 15 | Bearing, Worm | 2 |
| 17 | Grease Fitting | 2 |
| 18 | Lock Screw | 1 |
| 19 | Eye Bolt (250 ton only) | 2 |
| * | Shell Cap (anti-backlash models) | 1 |
| * | Set Screw (anti-backlash models) | 2 |
| * | Guide Bushing (inverted models) | 1 |
| * | Name Plate | 1 |
Operations Manual
(approx. 2.4Mb)
100 ton Specs
(approx. 0.5Mb) 150 ton Specs
(approx. 0.5Mb) 250 ton Specs
(approx. 0.5Mb)Machine Screwjack Actuators
These screw actuators offer a positive mechanical action, precise positioning and uniform lifting speeds.
The standard configurations include, upright or inverted units with translating or rotating lifting screws, with top plates, threaded or clevis end fittings.
They can be controlled accurately for positioning within thousands of one inch.
Unevenly distributed loads can be lifted with uniform speeds.
All actuators are designed and built to be positive acting, giving accurate response to motive power.
Top Plate
Clevis End
Threaded End
Translating Machine Screwjack Actuators - 100, 150 and 250 ton.
* For loads of from 25% to 100% of Actuator load rating. Torque requirements are approximately proportional to the load.
** Closed heights are for standard upright top plate models and may vary with different screw ends, inverted models, or when bellows boot is used.
| Actuator Number | Rated Load (ton) | Diameter of Lifting Screw (in) | Closed Height** (in) | Base Size (in) | Worm Gear Ratios | Turns of Worm for 1" Raise | Maximum HP Per Actuator | Torque at Full Load (in-lbs) | Actuator Efficiency Rating (%) | Weight with Base Raise of 6" (lb) | Weight for Each Additional 1" Raise (lb) | ||||||
| Upright | Inverted | Standard Ratio | Optional | Standard Ratio | Optional | Standard Ratio | Optional | Standard Ratio | Optional | Standard Ratio | Optional | ||||||
| 9099 | 9098 | 100 | 6 .750 Pitch Square | 24 | 20.75 x 24.5 | 12:1 | 36:1 | 16 | 48 | 25 | 11 | 16,000 | 8,600 | 13.0 | 8 | 1,200 | 9 |
| 18150 | 18149 | 150 |
7, 1,000 Pitch Square |
24 | 20.75 x 24.5 | 12:1 | 36:1 | 12 | 36 | 25 | 11 | 28,100 | 15,500 | 14.1 | 8.6 | 1,350 | 12.6 |
| 2250 | 2249 | 250 | 9, 1000 Pitch Square | 30 | 29.5 x 41 | 50:1 | - | 50 | - | 35 | - | 20,000 | - | 8.0 | - | 2,700 | 23 |
Anti-Backlash Actuators
| Actuator Number | Rated Load (ton) | Torque at Full Load (in-lbs) | Actuator Efficiency Rating (%) | Closed Height (in) | Weight with Base Raise of 6" (lb) | ||
| Standard Ratio | Optional | Standard Ratio | Optional | ||||
| 9499 | 100 | 17600 | 9460 | 11.7 | 7.2 | 26.5 | 1325 |
| 48150 | 150 | 30900 | 17050 | 12.7 | 7.7 | 26.25 | 1475 |
| 2250 | 250 | 22000 | - | 7.2 | - | 36.6 | 2975 |
Maximum Free Vertical Movement of Actuator Lifting Screw
| Actuator Model | Free Movement (in) |
| 100-ton | .18 |
| 150-ton | .23 |
| 250-ton | .23 |
Maximum Free Rotational Movement of Actuator Worm Shaft
| Actuator | Model/Ratio | Free Movement (degrees) |
| 100-ton |
12:1 36:1 |
20 45 |
| 150-ton |
12:1 36:1 |
20 45 |
| 250-ton | 50:1 | 45 |
Minimum Gear Internal Thread Thickness at ID Land
| Actuator Model |
Minimum Gear Thread Thickness (in) |
| 100-ton | .18 |
| 150-ton | .23 |
| 250-ton | .23 |
Minimum Gear Tooth Thickness at OD Land at Centre
| Actuator Model | Minimum Gear Tooth Thickness (in) |
| 100-ton | .14 |
| 150-ton | .14 |
| 250-ton | .18 |
Translating Machine Screw Actuator Parts List - 100t, 150t and 250t.
| Index Number | Part Name | Quantity |
| 1 | Bushing | 1 |
| 2 | Base Plate | 1 |
| 3 | Shell, Actuator | 1 |
| 4 | Pipe, Bottom | 1 |
| 5 | Screw, Lifting | 1 |
| 6a | Worm Gear | 1 |
| 6b | Worm Gear and anti-backlash nut assembly (Mfg'd and sold in sets only) | 1 |
| 7 | Bearing, Bottom Load | 1 |
| 8 | Bearing, Top Load | 1 |
| 9 | Screw, Cap | 12 |
| 10 | Washer, Lock | 12 |
| 11 | Flange, Worm | 2 |
| 12 | Shim, Flange | 2 |
| 13 | Seal, Oil | 2 |
| 14 | Worm | 1 |
| 15 | Bearing, Worm | 2 |
| 17 | Grease Fitting | 2 |
| 18 | Lock Screw | 1 |
| 19 | Eye Bolt (250 ton only) | 2 |
| * | Shell Cap (anti-backlash models) | 1 |
| * | Set Screw (anti-backlash models) | 2 |
| * | Guide Bushing (inverted models) | 1 |
| * | Name Plate | 1 |
Operations Manual
(approx. 2.4Mb) 100 ton Specs
(approx. 0.5Mb) 150 ton Specs
(approx. 0.5Mb) 250 ton Specs
(approx. 0.5Mb)
Contact Us About This Product
If you wish to receive a quote for this product, please use the 'Pricing' tab above, this form is for general enquiries regarding this product only.
You can also Request a Quote using the Buy/Quote tab above!
You can easily add more than one item to the Quote Request. This is highly recommend as we will be able to suit your needs much more efficiently.
Share this page!
Save this QR code
for use on Smart Phones
