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Whether you are lifting, lowering, tipping or moving a load, screw jacks are ideal for various applications requiring a powerful, reliable and easily adaptable solution.
When standard Nook or Thomson screw jacks don’t meet your exact specification requirements, our engineering experts can help customize a solution for your application. Our custom options, which include assembly, nuts, screws, special coatings, thread forms and more, can meet your needs and improve your machine’s performance.
Nook and Thomson provide extensive online resources to help you no matter where you may be in the purchase decision process. An example are our screw jack engineering calculators, which allow you to compute specifications key to selecting the ideal screw jack.
Delivering high reliability and life expectancy under varying operating conditions, Thomson and Nook screw jacks are optimal for applications that require high speed, vibration, shock loading, precise positioning requirements and high torsional loads. In this video, learn what goes into making our high-quality screw jacks and how they can be your next linear motion solution.

With the capability of handling loads up to 100 tons, screw jacks have made a name for themselves when it comes to designing for high-load, linear motion applications. However, determining whether a machine screw jack or ball screw jack is the right fit can be difficult. Each delivers key benefits depending on the application parameters.
This webinar will examine key design considerations as they apply to both screw jack types to help you better and more quickly determine which is more ideal for your application.
• The key features and benefits of machine and ball screw jacks.
• The major differences between these two types of screw jacks.
• The application parameters designers need to consider when choosing between machine and ball screw jacks.
• How to choose the right screw jack for your linear motion designs.
Presenter: Mitch Katona, Product Line Specialist, Thomson Industries, Inc.
In this webinar recording, learn how to add a new design option to your precision linear motion toolbox. Screw jacks offer your applications a host of benefits, including power, reliability, precision and flexibility.
Nook screw jacks offer the ability to lift, position, hold and support loads in a variety of industrial applications. These jacks will provide excellent performance and reliability in the average indoor industrial facility with a dry environment and an operating temperature of 32oF (0oC) – 180oF (82oC). However, not all applications are in these ideal conditions. Nook offers many options to meet non-ideal conditions.
Learn MoreRegardless of the type of worm gear jack you are considering (machine screw or ball screw), there are eight factors that are critical for developing the optimal linear motion system. In this post, we will examine these design constraints and how they can impact proper sizing, placement, and configuration of your screw jack system.
Learn MoreThere have been some interesting linear motion technical innovations designed to serve the food segment in recent years. But, many of the emerging food applications are still perfect for the venerable screw jack. It's simple yet effective design is timeless, and it is a true work horse for food applications. In the food sector, screw jack systems are typically deployed in three common and versatile arrangements. This post talks about a few of these in more detail.
Learn More| Nook Worm Gear Screw Jacks | 1082 KB |
| ActionJac | 19283 KB | |
| Worm Gear Screw Jacks Muli®, Jumbo® | 5680 KB | |
| Worm Gear Screw Jacks Muli®, Jumbo® | 5575 KB | |
| Worm Gear Screw Jacks Muli®, Jumbo® | 5375 KB |

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
Stop Collar
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.
Machining that is done to the end of the screw
Bellow cover for protection against external influences. Suitable for horizontal or vertical installation.
The diameter and lead of the screw used. On most units there is only one choice per size and type. On Muli 4 there are 2 different ball screw choices.
All others leave this position in the part number blank.
This part number is not available for sale online but may still be available for sale. Click here to contact Thomson Customer Support.
Customer ServiceSelect the desired Jack Arrangement.
The lift shaft of a rotating style jack should be supported by a radial bearing at the end of the rotating lift shaft. This will increase the column strength and critical speed of the lift shaft.
The lift shaft of a translating style jack must be attached to something which prevents the lift shaft from rotating. If it is not, the lift shaft (and the load) will turn and not translate.
A feature can be added to a Ball screw jacks that prevents rotation of the lift shaft. Anti-rotation is accomplished by a square guide attached to the screw translating inside a square stem cover attached to the jack. The square stem tube is supplied with lube fittings.
Click the product link for details.
| Part Number |
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| MULI & JUMBO Screw Jacks - Type N | |||
| MULI & JUMBO Screw Jacks - Type N - TGS | ![]() |
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| MULI & JUMBO Screw Jacks - Type N - KGS | ![]() |
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| MULI & JUMBO Screw Jacks - Type R | |||
| MULI & JUMBO Screw Jacks - Type R - TGS | ![]() |
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| MULI & JUMBO Screw Jacks - Type R - KGS | ![]() |
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| MULI & JUMBO Screw Jacks - Type V | |||
| MULI & JUMBO Screw Jacks - Type V - TGS | ![]() |
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| MULI & JUMBO Screw Jacks - Type V - KGS | ![]() |
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Nook screw jacks can be configured in a variety of arrangements based on the specific requirements of your application. Nook offers our customers a wide selection of screw jack accessories that allow you to develop a complete system from a single source.
The design template forms below can be submitted to assist us in designing a complete screw jack system based on your exact needs.
Common arrangements include:
"U" Arrangement
"H" Arrangement
"T" Arrangement
