U-Type vs L-Type Spiral Ground Piles

U-Type Screw Piles feature an integrated structure consisting of a steel pipe shaft, helical blades, and a top U-shaped bracket. The bracket is pre-drilled with multiple bolt holes, allowing it to wrap around and securely fasten square tubes, solid wood posts, or rectangular columns, providing full-circumference fixation. They are available in a full range of specifications, with pipe diameters from 48mm, 60mm, 68mm, and 76mm, wall thicknesses from 1.5mm to 3.0mm, and overall lengths from 550mm to 3000mm, making them suitable for a wide variety of medium-to-heavy outdoor projects.

L-Type Screw Piles have a more streamlined structure, featuring a right-angled steel plate welded on top. The column is installed by single-point support at the top and bolted fixation at the base. They are mainly offered in 60mm and 76mm standard pipe diameters, paired with 6-8mm thickened steel plates. Compact, lightweight, and space-saving, they offer a simple installation process and are a cost-effective choice for light-duty applications.

The U-type screw pile excels in strong stability, high load-bearing capacity, and excellent resistance to deformation. Its wrap-around limiting structure effectively resists displacement and tilting caused by strong wind lateral pressure, soil loosening, and frost heave. It delivers balanced pull-out and compressive resistance, making it well suited for demanding geological conditions such as coastal windy areas and northern frozen soil regions. In addition, the full-wrap design protects wooden posts from corrosion and aging, significantly extending the service life of the project—ideal for long-term permanent installations.

The L-type screw pile focuses on high cost-effectiveness and rapid installation. Its minimalist design reduces production costs, offering a strong price advantage while meeting light-load requirements. Installation requires no complex procedures—posts can be directly placed on the L-shaped support plate and locked in place, saving labor and shortening project timelines. It is best suited for low-load, short-cycle temporary or small-scale auxiliary projects.

U-type screw piles are suitable for various medium-to-heavy permanent projects, including courtyard fencing, wooden decking and boardwalks, outdoor pavilions, distributed photovoltaic brackets, and large landscape barriers. Their reliable performance has earned wide recognition in the engineering market, making them the preferred choice for high-stability and high-safety projects.

L-type screw piles are designed for light-duty support applications. They are commonly used in outdoor advertising signs, landscape lighting posts, temporary fencing, garden trellises, and signposts—perfectly meeting the core needs of small and micro projects for lightweight, low-cost, and rapid installation.

All screw piles are manufactured using national standard Q235B new steel, with no thin-walled recycled materials. The helical blades are 3-5mm thick and welded with full penetration, ensuring no voids or skipped welds for a robust and durable structure. The standard surface treatment is hot-dip galvanizing, with a conventional zinc coating thickness of ≥65μm; customized thickened coatings can reach over 80μm. This ensures excellent corrosion resistance in harsh environments such as humid climates, coastal saline areas, and frozen soils. In normal soil conditions, the service life can reach 20-30 years, and even in highly corrosive environments, they maintain stable performance for 15-20 years.

Selection can be quickly determined based on project load and intended service life:

For heavy-duty, permanent, or complex-geology projects with high wind resistance, choose U-type screw piles.

For light-duty, temporary, or costdriven small projects, choose L-type screw piles.

We accept full-customization services, including OEM specifications, laser marking, and personalized packaging. We can supply in stable bulk quantities to meet diverse customer needs, from retail to engineering support.