Cantilever Tie Rod Anchor
A twin ear anchor is the part that ties a flower-basket cantilever scaffold tie rod to the building. It has two drilled ears at one end, which a clevis pin pins to the head of the tie rod, and a threaded anchor shaft at the other that fixes into the structure. It is the upper anchor point of the diagonal tie rod, the connection that carries the tie rod pull back into the structural beam. Lengge makes them in M20 and M24, for through-wall, fully embedded and semi-embedded fixing.
We supply them with the rest of the cantilever tie rod set, galvanized and matched to your rods, factory-direct for high-rise and renovation projects.
| Item | Specification |
|---|---|
| Function | Upper anchor point for the cantilever tie rod |
| Connection | Twin ears, pinned to the tie rod with a clevis pin |
| Standard | M20 × 125, semi-embedded fixing |
| Through-wall | M20 × 225, through-wall fixing |
| Reinforced | M24 × 275, higher-load fixing |
| Material | High-strength steel |
| Finish | Hot-dip galvanized |
| Supply | Matched with the cantilever tie rod set |
Thread, length and fixing are matched to your tie rod and anchoring method. Tell us the rods and how you fix into the structure and we match the anchor.
A twin ear anchor is the upper anchor point of a flower-basket cantilever scaffold tie rod. It has two ears at one end that pin to the tie rod with a clevis pin, and a threaded anchor shaft at the other that fixes into the building structure. It carries the pull from the diagonal tie rod back into the structural beam, which is what holds the cantilever beam in its braced triangle. It is also called a double ear ring or double lug anchor.
The two ears let the tie rod connect on the centre line of the anchor, so the pull runs straight along the rod. An older design used a single bent steel plate, which sat the rod off to one side; that twists the joint and stops the tie rod tensioning fully, and it can leave the cantilever beam under-braced. The twin ear design keeps the pull axial and in line, which is both safer and easier to tension correctly.
It works with all three. Through-wall, where the anchor shaft passes through the wall or slab and fixes on the far side; fully embedded, where it is cast into the concrete during the pour; and semi-embedded, a simpler middle option. The ear end that connects to the tie rod is the same; only the anchor end changes to suit the fixing method.
We make standard sizes in M20, with M24 for the reinforced, higher-load version. The length is set by the fixing method, shorter for semi-embedded and longer for through-wall. Tell us your tie rods and anchoring method and we match the anchor to them.
It is high-strength steel and hot-dip galvanized. The strength matters because this is a load-bearing anchor that carries the tie rod pull, and galvanizing matters because it stays in the structure exposed to the weather. Send your tie rod spec and we confirm the matching anchor.
We supply twin ear anchors in bulk and, more usefully, matched into the cantilever tie rod set with the clevis pin, tie rod and turnbuckle, so the parts fit together. Stock moves quickly; custom sizes we confirm at the time. Parts pack into containers efficiently, so freight per ton stays low.
On a flower-basket cantilever scaffold, the beam is braced by a diagonal tie rod, and that tie rod has to anchor into the building at its upper end. The twin ear anchor is that anchor. It is a small part, but it is load-bearing and safety-critical, because it is where the whole pull of the tie rod meets the structure. This page covers what it does, why the twin ear shape matters, and the fixing options.
A cantilever beam reaches out from the building and the tie rod pulls its outer end back up to the structure above, forming a braced triangle. The twin ear anchor is the top corner of that triangle. The tie rod head pins between its two ears with a clevis pin, and its threaded shaft fixes into the structural beam. All the tension in the tie rod passes through this anchor into the concrete, so it has to be strong and fixed soundly.
This is the detail that matters. An older way to anchor the tie rod was a single bent steel plate bolted to the side of the structural beam, with the rod hung off it. The problem is that a single offset plate pulls the rod off the centre line, so the tie rod is no longer in line with where it needs to pull. That puts a sideways bend into the connection, stops the rod tensioning fully, and in the worst case leaves the cantilever beam under-braced, which is a real safety risk. The twin ear anchor fixes this by taking the rod between two ears on the centre line, so the pull is axial and in line. The rod tensions properly and the load goes straight into the anchor.
The anchor end is made to suit how you fix into the structure, and the thread and length follow the method:
| Type | Thread × length | Fixing method |
|---|---|---|
| Standard | M20 × 125 | Semi-embedded |
| Through-wall | M20 × 225 | Through the wall or slab |
| Reinforced | M24 × 275 | Through-wall, higher load |
Through-wall passes the shaft through the wall or slab and fixes it on the far side. Fully embedded casts the anchor into the concrete during the pour. Semi-embedded is a simpler middle option, part-cast without going all the way through. The M24 reinforced version is for higher-load connections. In every case the ear end that takes the tie rod stays the same, so the tie rod and clevis pin do not change.
Twin ear anchors are high-strength steel, hot-dip galvanized, because they carry load and stay in the structure exposed to weather. The simplest way to buy them is as part of the complete cantilever tie rod set, so the anchor, clevis pin, tie rod and turnbuckle all match on thread and size and arrive together. Confirm the thread, the length and the fixing method against your structure and your tie rods, and a supplier who makes the whole set can match the parts for you.
