Adjustable Scaffolding Base Jack | Solid & Hollow Stem Scaffold Levelling Jack Base with Swivel & Fixed Base Plate
Base jack, also known as scaffold levelling jack base, is a screw jack fitted with a flat base plate. Works for modular scaffolding and also compatible with acrow props & steel shoring props for concrete forms, it levels scaffolding height on uneven ground and distributes load evenly to keep the whole support structure stable and safe.
We offer many types of adjustable scaffold base jacks. Our Jack Base
covers solid base jacks and hollow base jacks, with fixed base plates and swivel base plates. You can pick either ACME thread or coarse round thread,with a full range of surface finishes. All scaffolding levelling leg comply with EN12811 construction standards.
This adjustable scaffolding base jack is widely used for shoring frames, Quickstage scaffolding systems and building formwork support projects.
It works with many scaffolding styles: ringlock, cuplock, quicklock, Krab 60, frame scaffolding (both shoring frames and conventional frames), as well as tube & coupler scaffolding.
-
![Adjustable Scaffolding Base Jack With Fixed Base Plate]()
Adjustable Scaffolding Base Jack With Fixed Base PlateMaterial: Q235 Carbon Steel, thread rolling processHeight: Customizable overall length, thickened welded fixed base plateLoad Capacity: High rated safe load, no deformation under heavy -
![Hollow Screw Jack Base]()
Hollow Screw Jack Base. Material: Q235. Diameter：26/28/30/32/34/35/38/48mm. Solid handle and hollow handle are available.. Base plate:150*150mm*5/6mm or 140*140mm*5/6mm. Length：300/500/600（hot sale specification)/800mm. -
![Screw Jack With Swivel Base Level Jacks]()
Screw Jack With Swivel Base Level JacksScrew Jack with Swivel BaseThe screw jack with swivel base is used as a starting base for a scaffold. . It is adjustable in height and angle to allow for compensation on uneven surfaces so that a -
![Adjustable Screw Jack]()
Adjustable Screw JackThe ajustable Screw Jack is the adjustable base for modular system scaffolding. It is used as the starting bases for scaffolding. It can be adjusted in height to compensate for uneven surfaces so -
![Swivel Screw Base Jack]()
Swivel Screw Base JackThis swivel base jack is widely compatible with various steel scaffolding systems, including coupler, cuplock, ringlock, quick-lock and frame scaffolding. Our swivel base screw jacks deliver -
![Screw Jack base, adjustable base jack]()
Screw Jack base, adjustable base jackWellfit's scaffolding screw jacks is the adjustable base for scaffolding system. They are available in electro-galvanized (zinc plated) or hot-dip galvanized finishes to suit different project -
![Hollow Screw Jack]()
Hollow Screw JackThis Hollow Screw Jack is made of high-quality Q235B steel. Its hollow structure is lightweight yet strong. With a cross handle nut, it allows quick and precise height adjustment for scaffolding or -
![Forged Jack Nut]()
Forged Jack NutThis Forged Jack Nut is a key component for adjustable scaffolding jacks. Made of high-strength forged metal, it features an internal thread and forged handles for easy manual height adjustment. It
Types Of Adjustable Base Jack
Solid Base Jack
The solid base jack has a threaded solid round steel stem. It is strong and supports heavy loads. You can choose fixed base plates or swivel base plates. This adjustable scaffold base jack fits frame scaffolding, like quickstage scaffolding and tube & coupler scaffolding. The outer diameter of our solid base jackis available in 32 mm, 34 mm and 38 mm, these sizes are widely used for traditional frame scaffolding.
Hollow Base Jack
The hollow base jack for scaffolding levelling uses a hollow steel tube stem. Compared with the solid jack base, this scaffolding levelling hollow jack base is lighter, easier to carry and cheaper. It works for most construction sites. It matches cuplock, ringlock, quickstage, quicklock and traditional tube & coupler scaffolding. The outer diameter of the hollow threaded stem is available in 32 mm, 34 mm, 38 mm and 42.7 mm. The 38 mm size is the most popular in scaffolding work.
Fixed Base Plate Base Jack
Fixed base scaffold screw jack is one type of scaffolding screw jack. It includes a fixed base plate, threaded spindle and jack nut handle. This fixed base plate base jack has a welded base plate. It cannot rotate. Its flat base plate spreads the bearing load. It works for level ground. It is the standard scaffold base jack for scaffolding support.
Swivel Base Plate Base Jack
The base plate of this swivel base plate base jack can rotate freely. When you build scaffolding on uneven ground, this swivel scaffold screw jack levels scaffolding to your required height and fits sloped ground. This swivel base jack is widely used for heavy formwork and shoring frame projects. It matches cuplock, ringlock, quickstage and frame scaffolding systems.
Besides modular ringlock, cuplock and frame scaffolding, our base jack can also serve as adjustable footing for acrow props, steel shoring props and post shores during concrete formwork shoring projects. If you need base solution for formwork props, tell us your prop tube diameter in your inquiry.
Components of Base Jacks
Three components for the scaffold adjustable base Jack:
Threaded spindles:Available in solid stem and hollow stem types, cold rolled for high load bearing performance,and welded or fixed on the base plate.
Base Plate:Square welded base plate at the bottom of the jack. It's at the centre of the base plate ,distributes pressure for scaffolding building construction and formwork support.
Jack Nut:A cast or forged wing nut matching threaded spindle. It helps adjustable height of scaffolding, locks securely under heavy load and meets EN12811 standard.
Base Jack Material & Process
Our adjustable scaffold jack base uses Q235 steel. Base plate, swivel base plate, jack nut and handle are all made of Q235 steel. Wellfit scaffolding base jack meets EN12811 standard.
Scaffolding base jack production steps: Steel cutting → Thread rolling for screw rod (ACME trapezoidal thread or coarse arc thread available) → Base plate punching → Welding screw rod to base plate → Assemble jack nut and weld handle → Grind and remove welding slag → Surface treatment (electro galvanized / painted / hot dip galvanized).
Every finished screw jack will pass bearing load test. Levelling jack base test reports are available on request. Goods are packed with steel pallets for safe delivery.
Thread rolling for screw rod
Thread rolling machine for scaffolding base jack stem. The steel tube or solid bar is pressed by rollers to form external threads, producing high-strength threads suitable for hollow and solid base jack production.
Welding
After thread rolling, robotic welding joins the base plate to the threaded spindle of scaffolding base jack. Automated welding guarantees uniform weld seam and strong load capacity for scaffolding leveling jack.
Base Jack Specification
| Base Jack Size Diameter x Thickness x Overall Length | Threads | Weight KG | Max Adj Height | Test Height | Load Capacity |
|---|---|---|---|---|---|
| OD 38x4x400mm | 4 TPI | 2.95 KG | 300mm | 300mm | 146.5 KN |
| OD 38x4x600mm | Coarse | 3.92 KG | 450mm | 450mm | 158.6 KN |
| OD 38x4x600mm | 4 TPI | 3.52 KG | 450mm | 450mm | 121.9 KN |
| OD 38x5x600mm | 4 TPI | 4.28 KG | 450mm | 450mm | 173.8 KN |
| OD 38x5x650mm | 4 TPI | 4.45 KG | 500mm | 500mm | 182.5 KN |
| OD 38x4x730mm | 4 TPI | 4.27 KG | 610mm | 610mm | 125.4 KN |
| OD 38x4x800mm | 4 TPI | 4.30 KG | 600mm | 600mm | 101.7 KN |
| OD 38x4x1500mm | 4 TPI | 6.48 KG | 1155mm | 1125mm | 37.05 KN |
| OD 48x5x610mm | ACME | 5.38 KG | 510mm | 510mm | 230.2 KN |
OD38x650mm Scaffold Screw Jack — Ultimate Load Test Result
Height Ultimate Load
| 100mm | 170KN |
| 200mm | 145KN |
| 300mm | 140KN |
| 500mm | 118KN |
| 600mm | 140KN |
Load Bearing Test of Scaffold Base Jack Load Test Data of Adjustable Jack Base
Threads Of Base Jack
The base jack spindle thread type includes trapezoidal thread(ACME threads) and coarse threads.
The base jack spindle comes with two thread options: trapezoidal thread(ACME threads) and coarse quick threads.Trapezoidal thread(ACME threads)has a pitch of 6.35 mm. Coarse quick thread features an 8 mm pitch, providing stronger load capacity and faster height adjustment. It is less likely to strip or wear under heavy scaffolding loads.
Surface Treatment
Scaffold base jacks have three surface choices.
Electro galvanized
Painted
Hot dip galvanized
Electro galvanized base jack is also called cold galvanized. It costs less. It works for indoor or dry environments.
Painted base jack has a painted coating. You can pick different colours for the jack bases in extra protection. This scaffolding base jack is widely used for temporary construction projects.
Hot dip galvanized base jack offers the best durability and rust resistance. Its service life can last over 15 years. It costs a bit more in different types of screw jack base. It fits wet working conditions and long-term projects.
How To Use Base Jack
- Check if the ground is hard. If ground is soft, put wood pad or plastic pad under the adjustable base jack.
- Place the scaffold base jack on firm ground or pads. Use the scaffolding levelling jack to fix uneven ground.
- Turn the jack nut of adjustable base jack, set the base jack for scaffolding to required height.
- Put the first layer scaffolding standard on the jack base. Use scaffolding ledger to lock the standard.
- Check scaffold level. Tighten jack nut to lock height. Keep the adjustable scaffolding base jack stable.
- Level all base jack. Ensure safe load for shoring frame and formwork support.
- Build scaffolding layer by layer. Add standards, ledgers, braces and scaffold boards until target height.
Jack Base Key Features
Adjustable Height & Site Levelling
This scaffold base jack（adjustable base jack and scaffold levelling jack ）provides precise height adjustment.
The base jack spindle and jack nut allow fast levelling for uneven construction ground, stabilizing the whole scaffolding structure.
Heavy-Duty Load Capacity
Made of high-strength Q235 steel, this heavy duty base jack and load-bearing base jack supports heavy construction loads.
It bears the weight of scaffold frames, workers, materials and tools, evenly distributing loads on the ground to prevent tipping or shifting.
Corrosion Resistant Surface
Available in hot dip galvanized base jack, electro galvanized base jack and painted base jack.
The corrosion-resistant finish extends the service life of scaffolding base jacks in harsh outdoor environments.
Simple & Safe Operation
This adjustable scaffolding base jack features tool-free height locking.
The solid base plate improves ground contact, keeping frame scaffolding stable, safe and upright during construction.
Wide Compatibility
Compatible with both traditional and modular scaffolding systems, our scaffold levelling jack fits modular scaffolding,
frame scaffolding, ringlock scaffolding and construction shoring systems for various building projects.
Jack Base Application
Building Construction
Scaffold adjustable base jack supports frame scaffolding and ringlock scaffolding in building construction.
Bridge & Infrastructure
Scaffolding levelling jack works for bridge, road and tunnel projects. Heavy duty jack base keeps scaffolding stable.
Factory & Renovation Work
Jack base provides solid foundation support for scaffolding during home or building renovations.
Shoring & Scaffold Systems
This adjustable scaffolding base jack matches different shoring frame systems and formwork support jobs.
Base Jacks VS Screw Jacks
Screw jack is a broad category of adjustable threaded supports for scaffolding and formwork. It includes base jacks, U-head jacks, forkhead jacks and J-head jacks.
Scaffold base jack is also called adjustable base jack(adj base jack), scaffolding levelling jack, scaffolding levelling feet, scaffold adjustable leg, jack base, scaffold leg levellers or scaffold levellers, scaffold base jack, screw jack with base plate etc.Base jack belongs to screw jacks. Fitted with a base plate, it sits at the bottom of scaffold posts for leveling and load distribution.
U-head Jacks, forkhead jack and J-head jacks are installed at the top of scaffolding. They support beams for formwork shoring.
In short, screw jacks contain bottom base jacks and top support jacks.
Scaffolding Base Jack
U-head Jack
Related Accessories：jack nut & base plate
Base Jack Nuts(Handles)
There are three types of scaffold base jack nuts.
- Forged Jack Nuts
- Cast Steel Jack Nuts
- Cast Iron Jack Nut
Base Jack Plate Sizes
The scaffold Levelling Jack Base Plate is ordinarily square. The popular sizes include :
120x120mm
140x140x 5/6 mm
150x150x 5/6 mm
152x152x 5/6 mm
160x160mm
180x180mm
200x200x9.5mm
The thickness of the base plate, according to different scaffold systems, is generally in the range of 4mm to 10mm.
Base Jack Packing and Delivery
Our adjustable base jacks are well packed against rust and impact. We support OEM & ODM for scaffold base jacks.FCL & LCL shipping available, stable lead time for sea delivery.
shanghai
FAQ
Q1: What is a scaffold base jack used for?
A1: The scaffold base jack, also called scaffolding levelling jack, levels scaffolding and shoring frames on uneven ground. It supports formwork systems and keeps the whole structure stable.
Q2: What materials make up the adjustable base jack?
A2: Our adjustable base jack is made of steel. It includes threaded spindle, base plate and adjusting nut. We supply solid spindle and hollow spindle base jack for scaffolding.
Q3: Can the base jack work with ringlock scaffolding?
A3: Yes. This adjustable scaffolding base jack fits ringlock, frame scaffolding and many shoring systems.
Q4: How to install the scaffold base jack correctly?
A4: Put the base jack on firm ground. Adjust height, lock the nut and check stability before building scaffolding.
Q5: Can this scaffolding base jack fit acrow props and steel shoring props for concrete forms?
A5: Yes, our adjustable base jack can be matched with steel props, acrow props and post shores for concrete form shoring. Just tell us the outer diameter of your prop tube when you send inquiry, we can confirm the fit and recommend the correct thread size.
Q6: What is the difference between solid stem base jack and hollow stem base jack?
A6: Solid stem base jack has stronger load capacity, ideal for heavy-duty scaffolding and high-load formwork jobs. Hollow stem base jack is lighter, more cost-effective for standard light & medium load ringlock or frame scaffolding projects.
Q7: Do your base jacks meet EN12811 standard for construction scaffolding?
A7: Yes. Our base jacks are manufactured following EN12811 requirements. Load test certificates and material mill certificates can be supplied for tender and site inspection upon request.
Q8: What surface finishes do you offer for scaffolding base jack?
A8: We provide three common finishes: hot dip galvanized, electro galvanized and painted. Hot dip galvanized base jacks are best for outdoor, coastal or long repeated use to resist rust. Painted base jacks are economical for short-term projects.
Q9: What is your MOQ and production lead time for bulk base jack orders?
A9: We accept sample orders for quality checking. MOQ for full container bulk orders is flexible. Normal lead time for standard base jacks is 15–25 working days, depends on finish and total quantity.
Q10: What’s the difference between fixed base jack and swivel base jack?
A10: Fixed base jack works on flat, level ground. Swivel base jack can tilt to adapt sloped or uneven ground, widely used for bridge falsework and complex formwork support.
Q11: Can you customize the length, thread size or mark our logo on base jacks?
A11: Custom stem length and thread specifications are available for large orders. OEM logo marking can also be arranged when quantity meets our requirement.
Q12: How do you pack base jacks for sea shipment?
A12: Normally packed in bundles or on steel pallets, wrapped with plastic film. We can follow your special packing request for container loading.
Related Products
Screw Jack Types
✓ Adjustable Fork Head Jack
Scaffold & Formwork Accessories
✓ Crab 60 Shoring System
Contact us for technical drawings, test certificates or custom sizes of scaffold base jack. Our base jack complies with EN 12811. Test reports and factory inspection certificates available on request.We also offer customized spindle length and base plate size to match your formwork project.
As one of the most professional base jack manufacturers and suppliers in China, we have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy high quality base jack at competitive price from our factory.
Popular Products
