What It Is

A screw pile is a steel foundation post that is twisted into the ground rather than driven or buried. It looks like a large steel screw: a round shaft with one or more helical plates around it. Once the machine turns it into the soil, it holds immediately and can take load the same day. There is no concrete to pour and no digging, so the site stays clean and the work is finished in minutes. This is why ground screws are so popular for solar-panel fields, fences, gates, signs, small buildings, and garden structures.

Choosing the Steel

The two parts that matter are the shaft and the helical plates. For the shaft we use steel pipe or solid bar, and for the plates we use rolled steel sheet. The steel grade depends on how heavy the load is and how hard the ground is:

• Q235B / S235JR — a versatile, easy-to-weld carbon steel. It is the standard choice for normal loads like fencing and small frames, and it keeps the cost down.
• Q355B / S355JR — a stronger grade with roughly 1.5 times the yield strength of S235. We pick this when the pile must carry a heavier structure or has to go through compact, stony, or clayey soil.

Every batch of steel comes with a mill certificate, so the material can always be traced back to its source and checked against the order.

Stopping Rust — the Coating

Since the pile lives in the ground, rust protection is the difference between a 5-year product and a 20-year one. Our standard is hot-dip galvanizing to ISO 1461. The whole pile is cleaned, pickled, and dipped in molten zinc, which gives it a tough, even coating of about 80–100 μm on average. The important point is that the zinc also covers the weld seams and the inside of the pipe. For seaside or industrial sites we can go thicker, add a powder top coat, or switch to stainless steel (304 or 316).

How We Make It

The process runs in a fixed order so quality stays consistent:

1. Cutting — the pipe is cut to length, and the blade plates are cut with plasma or flame. Edges are ground smooth.
2. Forming the spiral — each blade is pressed and rolled into a continuous spiral with the exact pitch and outer diameter from the drawing. This geometry decides how much weight the pile can hold.
3. Machining — the shaft gets a driving tip at one end and a thread or connector plate at the other, ready for the superstructure.
4. Welding — the spirals are welded onto the shaft by qualified welders using an approved procedure. We check every weld by eye, and we add magnetic-particle testing on the main joints when the spec asks for it.
5. Galvanizing — the finished pile is dipped and the coating thickness is measured at several points.
6. Inspection & packing — we check length, diameter, pitch, straightness, and the connector, then bundle, protect, and pack the piles with product marks and lot numbers.

Documents We Supply

To give the buyer confidence, every shipment can include the mill test certificates, an inspection report, a galvanizing certificate, dimensional records, and photos of the finished goods. Manufacturing itself follows EN 10025 for steel, ISO 1461 for galvanizing, and ISO 3834 / EN 1090 for welding, so the product is easy to verify against any standard or drawing.

The Short Version

A screw pile is quick to install, kind to the site, and ready to use right away. With the right steel grade, a proper galvanizing thickness, and controlled welding, it lasts around 20 years and can even be unscrewed and reused. We can make them to your exact drawing — any diameter, blade count, or connector style you need.