Cast-In Anchor Point
A concrete threaded insert is a fixing point cast into concrete. It is a plastic body holding an internal thread, in this case a square nut, that is set into the formwork and cast in during the pour. Once the concrete sets, a bolt threads into the insert to anchor whatever fixes to that point, with no drilling later. Lengge’s insert holds an M20 square nut and is the cast-in anchor for flower-basket cantilever scaffold beams, as well as a general cast-in fixing point.
The plastic body positions the nut and keeps concrete out of the thread, so the fixing is clean and ready for the bolt. Factory-direct, supplied with the embedded system that sets it.
| Item | Specification |
|---|---|
| Type | Cast-in concrete threaded insert |
| Body | Plastic |
| Thread | M20 square nut (40 × 40 × 20), cast in |
| Function | Threaded anchor point cast into concrete |
| Installed | Set on the formwork, cast in during the pour |
| Receives | A bolt threaded in after the concrete sets |
| Use | Cantilever scaffold beam anchors, general fixings |
| Nut finish | Galvanized |
Thread size is matched to the bolt that fixes into the insert. Tell us the bolt and the application and we match the insert to it.
A concrete threaded insert is a threaded anchor point cast into concrete. It is a body, in our case plastic, holding an internal thread or nut, which is fixed in the formwork and cast into the concrete during the pour. After the concrete sets, a bolt threads into the insert to anchor whatever is being fixed at that point. It gives you a clean, pre-placed fixing in the concrete with no drilling later.
It is cast in place. Before the pour, the insert is set against the inside face of the formwork, held there by an installation bolt so it does not move, with its opening flush to the surface. The concrete is poured around it, and when the formwork is stripped the insert is locked in the concrete with its thread accessible at the face. No drilling or post-fixing is needed.
On a flower-basket cantilever scaffold it is the anchor that the cantilever beam bolts onto: the insert is cast into the structure, and later a high-strength double-head bolt threads into it to mount the beam. More generally, a concrete threaded insert is used as a cast-in fixing point for brackets, supports and fixings, anywhere you want a bolted connection to concrete without drilling an anchor in afterward.
The thread is M20, matched to the bolt that fixes into it. The internal thread is carried by a square nut held in the insert. Tell us the bolt you are fixing with and we match the insert thread to it.
The body is plastic and the nut is steel, galvanized. The plastic body positions the nut and, importantly, keeps the wet concrete out of the thread during the pour, so the nut stays clean and the bolt threads in easily afterward. The galvanized nut resists corrosion in the concrete over the life of the fixing.
We supply concrete threaded inserts in bulk, and matched with the installation bolt and wing nut that set them on the formwork, so the embedded kit is complete. Stock moves quickly; custom threads we confirm at the time. Parts pack into containers efficiently so freight per ton stays low.
Drilling an anchor into hardened concrete is one way to fix something to it. Casting the fixing point in before the concrete sets is the other, and it is stronger and cleaner. A concrete threaded insert is how you do that: a threaded socket cast into the concrete, ready for a bolt. This page covers what it is, how it is installed, and the part it plays in a cantilever scaffold.
A concrete threaded insert is a body holding an internal thread that is cast into concrete so the thread becomes a permanent, load-bearing fixing point. Ours is a plastic body holding a steel square nut. The plastic is not the strength, the cast-in nut is; the plastic positions the nut, holds it square to the surface, and keeps wet concrete out of the thread during the pour. When the concrete cures, the nut is locked in by the surrounding concrete, and a bolt threads straight into it. Because the load transfers through the cast-in nut into the concrete, the fixing is stronger than a hole drilled and plugged afterwards.
The insert is set on pour day. It is fixed to the inside face of the formwork, with its opening flush to the form, and held there by an installation bolt and a wing nut so it cannot float or shift while the concrete is placed and vibrated. The concrete is poured around it. When the formwork is stripped, the installation bolt and wing nut come off and are reused, and the insert stays cast in the concrete with its thread open at the surface, ready for the bolt. No drilling, no post-installed anchor.
On a flower-basket cantilever scaffold, this insert is the anchor the cantilever beam mounts onto. During construction the insert is cast into the structural slab or edge beam at each beam position. Later, when the scaffold is built, the high-strength S8.8 double-head bolt threads into the cast-in nut, with a washer and a protective cap, and the cantilever beam is bolted to it. The whole load path of the cantilever beam, and the scaffold it carries, runs back through this insert into the structure, which is why the nut is held square and the thread kept clean. The same insert works as a general cast-in fixing point in other construction too, wherever a bolted connection to concrete is needed without drilling.
The cast-in nut is M20, matched to the bolt that fixes into it, and galvanized so it does not corrode in the concrete over the life of the building. The body is plastic. The sensible way to buy the insert is together with the installation bolt and wing nut that set it on the formwork, so the pour-day kit is complete and the threads all match. Confirm the bolt size you are fixing with, and a supplier who makes the whole embedded system can match the insert, the setting hardware and the mounting bolt for you.
