Ground Screw Type U – 101x885x1.8 M12
Item no. 228850U-head, concrete-free foundation for posts, fences & structures. M12 thread.
Technical data
| Type | Type U ground screw / screw pile |
|---|---|
| Series | U series |
| Shaft diameter | 101 mm |
| Length | 885 mm |
| Wall thickness | 1.8 mm |
| Head / thread | M12 |
| Material | S235 structural steel |
| Coating | Hot-dip galvanised (HDG) |
| Installation | Driven in — no concrete, no pre-drilling in most soils |
| Typical usage rate | approx. 1 pcs per m² (double joist layout); the exact number follows the substructure spacing |
| Sold as | 1 pcs |
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The Ground Screw Type U – 101x885x1.8 M12 is a screw-in steel foundation for decks, terraces and other lightweight structures. It is wound into the ground like a giant screw — no digging, no concrete and no curing time — and it carries load as soon as it is in. The pile is 101 mm in shaft diameter, 885 mm long, formed from 1.8 mm wall steel, and finished with a U-shaped head that receives a timber post or beam directly between its two plates and is then bolted through with an M12 bolt.
At 885 mm this is a short pile intended for firm, well-compacted ground and lightly loaded structures. The U head is the fastest way to sit a 90–100 mm timber post on a screw pile: drop the post in, drill through and bolt.
Why choose a ground screw instead of concrete?
- No concrete, no curing — the footing carries load the moment it is driven, so the structure can be built the same day.
- No excavation and no spoil — lawns, paving and planting around the site stay intact.
- All-season installation — unlike concrete, ground screws can be installed in frost, rain and cold weather.
- Works in almost any soil — clay, sand, gravel, made ground and lake beds, without pre-drilling in most conditions.
- Removable and reusable — the screw can be unwound and re-driven if the structure is ever moved.
- Lower total cost — less labour, no ready-mix, no waste disposal, no waiting time.
Where this size is used
- Decks and terraces — a level, load-bearing grid of footings that will not settle or heave.
- Pergolas, carports, gazebos and canopies — post bases installed in a single visit.
- Fences, gates and screens — fast, repeatable post spacing in any soil.
- Garden rooms, sheds, greenhouses and log stores — a full foundation without excavation.
- Playgrounds, signage, flagpoles and lamp posts — secure anchoring in open ground.
- Jetties, piers, boardwalks and footbridges — ground screws can also be driven into a lake or river bed.
Installation
The pile can be driven by hand with a turning bar for shorter lengths, or with a hydraulic drive head on a mini-digger for longer piles and harder ground. Set out the grid first, drive each pile until the head sits at the planned level, then fine-tune the height by winding the pile in or out. Keep the pile vertical while driving; if it meets a stone, back it out, move 50–100 mm and re-drive. Installation equipment is available for hire.
Good to know
Ground screws are a complete replacement for concrete pad foundations under lightweight structures. Because nothing is cast, the footing can be unwound and reused, which makes them the usual choice for temporary buildings, rented sites and structures that may be relocated.
