Scaffold Screw Jack, Adj Jack Base & U Head Jacks

Your Comprehensive Guide to Scaffold Screw Jacks

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Scaffold screw jacks serve as adjustable components within scaffolding systems. They are constructed with adjustable screw stems, jack nut handles featuring internal threads, and jack plates. These elements allow for the easy adjustment of scaffold heights by simply rotating the jack nuts during construction.

Commonly referred to as leveling jacks, scaffold screw legs, or scaffold feet, scaffold screw jacks come in various forms including jack bases, U head jacks, forkhead jacks, and J head screw jacks.

The base jack is particularly prevalent among scaffold screw jacks. It features a base plate and is often termed a threaded base plate or jack base.

Adjustable base jacks are primarily utilized to ensure level scaffold heights beneath the vertical scaffolding elements or ring lock systems.

The sizes of scaffold screw jack base plates can be tailored to specific requirements, though the most commonly used dimensions include 150x150mm, 140x140mm, and 120x120mm.

Moreover, the height of scaffold screw jacks can also be customized. You can choose the maximum adjustable height of the screw jack or specify the total height of the scaffolding units.

To enhance safety in scaffolding work, it is advisable for the jack nut to remain a minimum of 150mm from the top (or one-fourth of the overall height) to prevent potential mishaps during operations.

Numerous types of jack nuts are available, including:

1. Cast Iron Type Jack Nut
2. Cast Steel Type Jack Nut
3. Drop Forged Type Jack Nut

Among these, the cast iron type is the most sought after due to its advantages:

1. Cost-Effectiveness
2. Internal Threads Integrated with the Product
3. Fast Lead Times
4. Heavy Load Capacity

Though cast steel and drop-forged jack nuts offer greater strength, they are pricier and necessitate more complex threading processes.

Scaffold screw jack nuts vary in weight, categorized as light, medium, or heavy-duty options.

Finishes for scaffold screw jacks can include painted, zinc-plated (cold galvanized), or hot-dip galvanized coatings, with hot-dip galvanized (HDG) variations being the most robust for prolonged usage.

When it comes to threading configurations, square threaded and round threaded jacks are available at Wellmade.

Square threaded scaffold jacks come with a 6.35mm (4 TPI) tooth spacing, while round threaded jacks feature an 8mm spacing, commonly referred to as coarse threaded scaffolding, or quick threaded scaffolding jack stands.

Wellmade quick threaded screw jack bases are highly regarded in European and Australian markets for their:

1. Efficient Adjustment
2. Simplicity in Hot Dip Galvanizing Process
3. Enhanced Load-Bearing Capacity
4. Durable Jack Nuts for Greater Longevity

Wellmade scaffold screw jacks are engineered to match your scaffolding standards. The diameters must be narrower than the interior diameter of the scaffolding poles, and the support circles of the screw jack nuts should exceed the outer diameter of the vertical scaffold components. Our skilled engineers are available to assist in designing the appropriate scaffold screw jacks for your project.

Load Capacity Testing of Scaffold Screw Jacks by Wellmade

The load capacities of scaffold screw jacks vary based on their height. Wellmade routinely provides insights regarding load limits through practical tests conducted in our testing facilities.

What Weight Can 650mm Scaffold Screw Jacks Support?

Test Results for OD38x650mm Scaffold Screw Jack Load Capacity

• Height at 173mm: Ultimate Load = 173 KN
• Height at 143mm: Ultimate Load = 143 KN
• Height at 137mm: Ultimate Load = 137 KN
• Height at 106mm: Ultimate Load = 106 KN
• Height at 116mm: Ultimate Load = 116 KN
• Height at 135mm: Ultimate Load = 135 KN

Varieties of Scaffold Screw Jacks

Wellmade stands as a leading supplier of scaffold screw jacks in China, offering a comprehensive range of products tailored for diverse scaffolding applications.

Generally, there are two primary categorizations of scaffold screw jacks: bottom screw jacks and top screw jacks. Bottom types are employed at the base of scaffolds, while top types support upper sections, such as slabs and beams within concrete frameworks.

Bottom Scaffold Screw Jacks

Bottom screw jacks, also known as jack bases or adjustable bases, consist of threaded stem assemblies, scaffold jack nuts, and base plates. The adjustable jack nut allows these bases to be set at varying heights.

These jacks serve as base supports for scaffolding, particularly on uneven ground, as they allow for easy horizontal adjustments. Their other names include leveling jacks or leveling feet.

In measuring scaffold level adjustments, utilizing a level tool can ensure horizontal alignment. Maintaining consistent levels of scaffolding materials is vital for safety and stability.

Top Scaffold Screw Jacks

Top scaffold screw jacks are essential for the upper parts of scaffolding structures during construction. They are indispensable in shoring systems, supporting slab and beam frameworks.

In the shoring systems, top head scaffold screw jacks connect scaffolding components with formwork beams, functioning with various types of beams including timber beams (like h20), steel formwork beams (like tubular sections), and aluminum beams (like aluma).

Top head scaffold screw jacks are also compatible with various formwork systems, such as steel, steel-ply, and aluminum for both slab and beam formwork.

Universal and Swivel Screw Jacks

Besides jack bases and top head jacks, there are universal and swivel screw jacks. The universal jack does not include a base plate or top head, but when paired with either, it can create a jack base or top head variant.

Swivel jacks serve as jack bases designed for use on inclined surfaces, providing stability on slopes.

Bar and Tubular Scaffold Screw Jacks

Bar screw jacks, commonly known as solid scaffold jack stands, differ from tubular scaffold screw jacks, which have a hollow structure.

Bar screw jacks are constructed from solid round materials, with sizes ranging from OD26mm to OD48mm.

Hollow types, on the other hand, are made from scaffold tubes, available in seamless or welded varieties.

Scaffold Screw Jacks Featuring Socket Base Plates

Screw jacks with socket base plates consist of a universal jack partnered with a socket base plate. A bolt or rivet secures them together.

Two socket plate types exist; one of OD48mm intended for Crab 60 shoring systems and another at OD38mm suited for slab cuplock systems.

The OD48mm variants facilitate leveling beneath OD60mm Crab 60 scaffolding standards. The cuplock variation can connect with the cuplock system for optimal support.

Socket scaffold screw jacks can be finished with hot-dip galvanization, E-galvanization, or paint.

Screw Jacks Using Washer Locks

In heavy-duty shoring applications, screw jacks incorporate washer locks, typically in OD48mm for OD57 or OD60mm poles.

Adjustable Scaffold Wheels Integrated with Jacks

Adjustable scaffold wheels combine a castor wheel and a leveling jack base, available in various types such as rubber, plastic, PU, or cast steel.

The sizes and types of scaffold jack bases can be adjusted in accordance with project specifications.

These wheels are commonly utilized across mobile and movable scaffolding systems. Wellmade offers a selection of adjustable wheels in sizes from 5 to 12 inches to meet diverse operational requirements.

Screw Jacks Across Different Scaffold Systems

Wellmade specializes in standardized scaffold screw jacks, as well as customized versions based on specific needs.

The threaded diameters of our scaffold screw jacks range from OD26mm to OD48mm, with the following applications:

1. OD26mm: The smallest option for light-duty frame scaffold systems.
2. OD38mm: The most common size, ideal for ringlock and cuplock scaffolding.
3. OD30mm: Suited for traditional walk-through and ladder frames.
4. OD32-36mm: Designed for heavy-duty frames.
5. OD36mm: Applicable in Kwikstage scaffolding systems in Australia.
6. OD48mm and OD50mm: Best for heavy-duty shoring scaffolding systems.

The finish on Wellmade's scaffold screw jacks can be zinc-plated (E-galvanized) or hot-dip galvanized, accommodating various durability and budget needs.

These jacks find extensive applicability in a wide range of construction projects, including civil, industrial, and commercial sectors.

Specifications for Scaffold Screw Jack Bases

Customization is key for scaffold screw jack sizes, including their diameters, adjustable heights, overall heights, base plates, U heads, and forkhead sizes.

The most commonly utilized scaffold screw jacks are 24-inch jacks, 1-3/8-inch and 1-1/4-inch varieties, serving as scaffold supports.

Scaffold screw jack steel grades typically utilize S235, though C45 and S355 grades are available upon request.

Specifications for Solid Scaffold Jack Bases

Specifications for Hollow Type Screw Jack Bases

Specifications for Scaffold Screw U-Head Jacks

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