A base jack (also known as a screw jack or leveling jack) is an adjustable metal support component typically installed at the base of a scaffolding system. It is used to level the scaffolding on uneven ground, ensuring the entire structure remains stable and balanced. Scaffolding systems utilize both fixed and swivel base jacks; furthermore, based on the material of the threaded rod, they are categorized into solid adjustable base jacks and hollow adjustable base jacks. These two types differ significantly in terms of material composition, load-bearing capacity, unit weight, and the specific scaffolding systems for which they are best suited.
Differences Between Solid and Hollow Adjustable Base Jacks
Evaluation Dimension | Solid Base Jack | Hollow Base Jack |
Raw Material | Q235 / Q355 solid round steel (rolled/turned) | Q235 high-quality seamless or welded steel pipe |
Common Outer Diameters | Ø32mm, Ø34mm, Ø38mm | Ø34mm, Ø38mm, Ø48mm (wall thickness: 3.5mm–5.0mm) |
Load-Bearing Capacity (Ultimate Load) | Higher load-bearing strength (can support 100 kN – 200 kN+, depending on length) | Lower to moderate load-bearing capacity; sufficient for standard or general-purpose projects. |
Unit Weight | Heavier; relatively more labor-intensive to handle and transport. | Light weight (e.g., approx. 2.8–3.8 kg per unit for a 600mm size) |
Cost | Higher | Lower |
Typical Applications | Heavy-duty construction, high-rise scaffolding, heavy-duty shoring systems, and large-scale industrial or commercial projects requiring exceptional structural support. | General-purpose scaffolding, standard Ringlock or Cuplock scaffolding systems, and lighter-duty formwork or shoring structures. |
Common Scaffolding Systems | Frame scaffolding systems | Ringlock, Cuplock, and other modular scaffolding systems |
How to choose between solid and hollow adjustable base jacks for your project?
Heavy-Duty Shoring and Formwork Systems: Used in projects such as bridge construction, tunneling, and the casting of long-span concrete floor slabs in high-rise buildings.
Load-Bearing Modular Scaffolding: Compatible with systems such as Ringlock, Cuplock, and Kwikstage.
Large-Scale Industrial and Oil & Gas Projects: Major petrochemical infrastructure projects—common in the Middle East (GCC) or North America—often mandate the use of solid base jacks due to their higher safety factor.
In these scenarios, solid adjustable base jacks are the preferred choice. They offer an exceptionally high safety margin, superior resistance to bending and compression, and are highly resistant to threaded rod deformation or thread stripping under heavy loads.
Facade Scaffolding: Suitable for exterior wall construction, renovation, and painting/coating work on low- to mid-rise buildings.
Frame Scaffolding and Mobile Towers: Including "Baker-style" or standard frame scaffolding systems, commonly used in North America and Southeast Asia.
Lightweight Construction and Frequent Relocation: These systems are easy for workers to handle and install on-site, significantly reducing physical labor.
In these cases, hollow adjustable base jacks are an ideal choice. They are more cost-effective to purchase and ship, offering substantial savings while still meeting the load requirements for standard, non-heavy-duty scaffolding applications.
EK Scaffolding is a professional manufacturer of scaffolding equipment. We offer a wide range of adjustable base jacks and provide custom solutions tailored to your specific requirements. Contact us today!
Below are the specifications for EK Scaffolding’s base jack products:
Base Jack Type | Screw Rod | Base Plate | Finishing | Compatible Scaffolding System |
OD
(mm) | Length
(mm) | Size
(mm) | Thicknesses
(mm) |
Solid Base Jack | 26 | 200 - 600 | 100*100
-
120*120 | 4 - 5 | H.D.G
E-gal
Painted | Any applicable use case：
Ringlock System
Cuplock System
Kwikstage System
Frame System
Formwork System
…… |
Solid Base Jack | 28 | 200-800 | 120*120
-
150*150 | 4 - 6 | H.D.G
E-gal
Painted |
Solid Base Jack | 30 | 200-800 | 120*120
-
150*150 | 4 - 6 | H.D.G
E-gal
Painted |
Solid Base Jack | 32 | 300-8000 | 120*120
-
150*150 | 5 - 8 | H.D.G
E-gal
Painted |
Solid Base Jack | 34 | 300-8000 | 140*140
-
160*160 | 5 - 8 | H.D.G
E-gal
Painted |
Solid Base Jack | 35 | 300-1000 | 120*120
-
180*180 | 5 - 10 | H.D.G
E-gal
Painted |
Solid Base Jack | 36 | 300-1000 | 130*130
-
180*180 | 5 - 10 | H.D.G
E-gal
Painted |
Solid Base Jack | 38 | 300-1000 | 140*140
-
200*200 | 5 - 10 | H.D.G
E-gal
Painted |
Solid Base Jack | 40 | 400-1200 | 150*150
-
200*200 | 5 - 12 | H.D.G
E-gal
Painted |
Solid Base Jack | 42 | 400-1200 | 150*150
-
220*220 | 6 - 12 | H.D.G
E-gal
Painted |
Solid Base Jack | 45 | 400-1200 | 150*150
-
250*250 | 8 - 14 | H.D.G
E-gal
Painted |
Solid Base Jack | 48 | 400-1200 | 160*160
-
250*250 | 8 - 16 | H.D.G
E-gal
Painted |
Solid Base Jack | 50-60 | 600-1000 | 200 * 200+ | 10+ | H.D.G
E-gal
Painted |
Specifications can be customized |
Base Jack Type | Screw Rod | Base Plate | Finishing | Compatible Scaffolding System |
OD
(mm) | Thicknesses
(mm) | Length
(mm) | Size
(mm) | Thicknesses
(mm) |
Hollow Base Jack | 26 | 3.0 - 4.0 | 200 - 600 | 100*100
-
120*120 | 4 - 5 | H.D.G
E-gal
Painted | Any applicable use case：
Ringlock System
Cuplock System
Kwikstage System
Frame System
Formwork System
…… |
Hollow Base Jack | 28 | 3.0 - 4.0 | 200 - 800 | 100*100
-
150*150 | 4 - 6 | H.D.G
E-gal
Painted |
Hollow Base Jack | 30 | 3.5 - 4.5 | 200 - 800 | 100*100
-
150*150 | 4 - 6 | H.D.G
E-gal
Painted |
Hollow Base Jack | 32 | 3.5 - 4.5 | 300 - 800 | 120*120
-
150*150 | 5 - 8 | H.D.G
E-gal
Painted |
Hollow Base Jack | 34 | 4.0 - 5.0 | 300 - 800 | 120*120
-
160*160 | 5 - 8 | H.D.G
E-gal
Painted |
Hollow Base Jack | 35 | 4.0 - 5.0 | 300 - 1000 | 120*120
-
180*180 | 5 - 10 | H.D.G
E-gal
Painted |
Hollow Base Jack | 36 | 4.0 - 5.5 | 300 - 1000 | 130*130
-
180*180 | 5 - 10 | H.D.G
E-gal
Painted |
Hollow Base Jack | 38 | 4.0 - 6.0 | 300 - 1000 | 140*140
-
200*200 | 5 - 10 | H.D.G
E-gal
Painted |
Hollow Base Jack | 40 | 4.5 - 6.0 | 400 - 1200 | 150*150
-
200*200 | 6 - 12 | H.D.G
E-gal
Painted |
Hollow Base Jack | 42 | 5.0 - 6.5 | 400 - 1200 | 150*150
-
220*220 | 6 - 12 | H.D.G
E-gal
Painted |
Hollow Base Jack | 45 | 5.0 - 7.0 | 400 - 1200 | 150*150
-
250*250 | 8 - 14 | H.D.G
E-gal
Painted |
Hollow Base Jack | 48 | 5.0 - 8.0 | 400 - 1200 | 160*160
-
250*250 | 8 - 16 | H.D.G
E-gal
Painted |
Hollow Base Jack | 50 – 60 | 6.0 – 10.0 | 600 – 1000 | 200 * 200+ | 10+ | H.D.G
E-gal
Painted |
Specifications can be customized |
