A screw pile is a steel deep-foundation element that is screwed into the ground under torque instead of being hammered or dug in. Because no concrete, excavation, or curing time is involved, it can be installed and loaded the same day, which makes it one of the fastest foundation systems on the market. It is a common choice for solar-panel racking, fencing, gates, sheds, temporary halls, and other low-to-medium-loaded structures.

Materials

The pile is built around a central shaft, normally a steel pipe or solid bar, plus one or more spiral blades welded onto it. The most widely used steel grades are Q235B / S235JR for light and medium duty and Q355B / S355JR where higher strength or harder ground is expected. These steels are easy to weld and widely available, and the required grade should be confirmed against the drawing and the local soil conditions.

Because the pile works underground, corrosion protection decides its service life. The standard finish is hot-dip galvanizing to ISO 1461, typically giving an average coating thickness of 80–100 μm. Before dipping, the parts are cleaned and fluxed so the zinc bonds evenly to every surface, including the welds. Where the environment is highly corrosive, such as coastal sites, the options are thicker zinc, an added powder/paint top coat, or stainless steel (304/316).

Manufacturing Process

Production starts with certified steel. The pipe is cut to length and the plate is cut into blade blanks by plasma or flame cutting, then burrs are dressed off. The blanks are shaped into a continuous spiral with the specified pitch and outer diameter, which directly determines the pile’s load capacity. The shaft ends are machined next — a driving tip at the bottom and a threaded section or connector plate at the top so the superstructure can be attached.

The blades are then welded to the shaft. This is the load-critical step, so it is done by qualified welders following an approved procedure, and the welds are checked for cracks, porosity, and incomplete fusion. Where the specification asks for it, magnetic-particle inspection is added on the main joints. Spatter is removed and the weld area is smoothed for a clean finish.

After welding, the complete pile is hot-dip galvanized, and the coating thickness is measured at several points to confirm it meets the requirement. Each batch is then checked for length, blade diameter, pitch, straightness, and connector dimensions using calibrated tools, and the mill certificates are reviewed against the order. Finally, the piles are bundled, protected, and packed, with product marks and lot numbers for traceability.

Standards & Documentation

Manufacturing follows recognized requirements such as EN 10025 for the steel, ISO 1461 for the galvanizing, and ISO 3834 or EN 1090 for welding quality. For every shipment we normally provide the mill test certificates, dimensional and inspection reports, a galvanizing certificate, and photos of the finished product, so the buyer can verify compliance easily.

Why It Works for You

In short, a screw pile combines a fast, clean installation with dependable long-term performance. With the right steel grade, a proper galvanizing thickness, and controlled welding, the pile gives a solid foundation with a design life of around 20 years, and it can be unscrewed and reused if the site layout ever changes. We can supply screw piles fully built to your drawings, including custom diameters, blade counts, and connector types.