Description
The LTX 120mm polystyrene fixing plug 200pcs box is the Klimas LTX-10 length for an 80 mm insulation board fixed on the surface of new or stripped brick, block or concrete. Where 20 mm of old plaster stays on the wall, it holds a 60 mm board instead. The plug is hammer-set, all plastic, with a 60 mm plate.
An 80 mm board takes a different plug depending on the wall behind it. Below: when 120 mm is right and when the 140 mm plug is the one to buy; all lengths are in the insulation fixing accessories range.
What the 120 mm Plug Reaches
The Klimas selection table gives each length a board thickness for four cases — new or old wall, plate on the board or sunk into it. On brick, block and concrete the 120 mm plug reads:
| Wall | Plate on the board face | Plate recessed |
|---|---|---|
| New or stripped wall, 10 mm adhesive bed | up to 80 mm | up to 100 mm |
| Old plaster of 20 mm plus the adhesive bed | up to 60 mm | up to 80 mm |
The ETA formula agrees row for row: 120 − 10 − 30 = 80 mm of board on a new wall, and 120 − 30 − 30 = 60 mm over old plaster.
Aerated concrete needs 50 mm of anchorage rather than 30 mm. On those blocks the 120 mm plug holds a 60 mm board on the surface or 80 mm recessed on a new wall, and 40 mm or 60 mm over old plaster.
Why Fit the LTX-10 at 120 mm
- The 80 mm board on bare masonry. This is the length whose table row matches an 80 mm board with the plate on the surface.
- 100 mm recessed. Sinking the plate gives 20 mm more reach, so a 100 mm board on a new wall can use the same box.
- A fixing that does not leak heat. Polyethylene sleeve, glass-fibre reinforced polyamide pin: 0.001 W/K on the surface, 0.000 W/K recessed.
- Same drill, many walls. One 10 mm bit for concrete, brick, hollow and lightweight block and aerated concrete, all within ETA-16/0509.
- Stiff plate. A declared plate stiffness of 0.50 kN/mm keeps the 60 mm plate firm against the board face.
LTX-10120 Technical Data
| Parameter | Value |
|---|---|
| Product code | LTX-10120 |
| Sleeve diameter × length | 10 × 120 mm |
| Plate diameter | 60 mm |
| Drill bit | 10 mm (cutting diameter up to 10.45 mm) |
| Anchorage depth in the wall | at least 30 mm; 50 mm in aerated concrete |
| Drilled hole depth | at least 40 mm; 60 mm in aerated concrete |
| Sleeve material | Polyethylene |
| Pin material | Polyamide, glass-fibre reinforced |
| Point thermal transmittance | 0.001 W/K on the surface · 0.000 W/K recessed |
| Plate stiffness | 0.50 kN/mm |
| Minimum spacing, edge distance and wall thickness | 100 mm each |
| European Technical Assessment | ETA-16/0509 of 30 March 2026 |
| Box | 200 plugs |
Pull-Out Values by Wall Type
| Wall | Drilling | Characteristic pull-out |
|---|---|---|
| Concrete C12/15 | hammer | 0.50 kN |
| Concrete C20/25 to C50/60 | hammer | 0.75 kN |
| Solid clay brick | hammer | 0.75 kN |
| Calcium silicate solid brick | hammer | 0.60 kN |
| Calcium silicate hollow block | hammer | 0.60 kN |
| Vertically perforated clay brick | rotary only | 0.60 kN |
| Porotherm 25 perforated block | rotary only | 0.40 kN |
| Lightweight concrete block | rotary only | 0.60 kN |
| Aerated concrete, density from 0.35 kg/dm³ | rotary only | 0.50 kN |
| Aerated concrete, density from 0.65 kg/dm³ | rotary only | 0.60 kN |
Concrete reaches 0.75 kN from C20/25 in the Klimas sheet and from C16/20 in the 2026 assessment; if the concrete grade is unclear, design with 0.50 kN. Every figure here is a characteristic value — the insulation design applies safety factors and decides the plugs per square metre.
Installing the 120 mm Plug
- Stick the boards on first and let the adhesive carry them. Plugs only hold against wind suction.
- Drill a 10 mm hole through the board at a point with adhesive behind, going at least 40 mm into the wall itself, or 60 mm into aerated concrete.
- No hammer action in perforated brick, hollow blocks or aerated concrete.
- Blow out the dust by working the drill in and out four times, slowly.
- Seat the plate flush with the board and drive the pin in one action. A set pin must not be struck again.
Space plugs at least 100 mm apart and 100 mm from edges, install between 0 °C and +40 °C, and render over the plates within six weeks. For a whole wall, follow the guide to installing insulation fixings.
Recessing the Plate
Klimas cuts the recess with its WK-FT cutter, drives the pin and caps the hole with a polystyrene disc. With the 120 mm plug this lifts the reach to 100 mm on a new wall and 80 mm over old plaster — so an 80 mm board over plaster can stay on this box if it is recessed.
Selection Table for Every LTX Length
All nine lengths Renders World stocks, for brick, block and concrete. "New wall" includes a 10 mm adhesive bed; "old plaster" adds 20 mm of existing plaster to that bed.
| Plug | New wall, surface | New wall, recessed | Old plaster, surface | Old plaster, recessed |
|---|---|---|---|---|
| 70 mm | 30 mm | 50 mm | 10 mm | 30 mm |
| 90 mm | 50 mm | 70 mm | 30 mm | 50 mm |
| 110 mm | 70 mm | 90 mm | 50 mm | 70 mm |
| 120 mm (this box) | 80 mm | 100 mm | 60 mm | 80 mm |
| 140 mm | 100 mm | 120 mm | 80 mm | 100 mm |
| 160 mm | 120 mm | 140 mm | 100 mm | 120 mm |
| 180 mm | 140 mm | 160 mm | 120 mm | 140 mm |
| 200 mm | 160 mm | 180 mm | 140 mm | 160 mm |
| 220 mm (100 per box) | 180 mm | 200 mm | 160 mm | 180 mm |
For plaster thicker than 20 mm, add the extra to the board before choosing. Other build-ups go through the plug length calculator.
Choosing 120 mm or a Neighbour
- 120 mm for 80 mm EPS insulation boards on the surface of a new or stripped wall, or for 60 mm boards over old plaster.
- 140 mm for 80 mm boards over old plaster with the plate on the surface, or for 100 mm boards on a new wall.
- 110 mm for 70 mm boards on a new wall.
LTX 120 mm Plug — Before You Order
80 mm board: 120 mm or 140 mm plug?
Look at the wall. Bare or stripped masonry: 120 mm, because 80 mm of board, 10 mm of adhesive and 30 mm in the wall add up to 120. Old plaster left on: 140 mm on the surface, or this 120 mm plug recessed.
How many plugs and boxes?
Klimas's recommended minimum is 6 plugs per m² in the field of the wall and 8 per m² at corners, up to 15 m high. One box of 200 covers roughly 33 m² or 25 m²; a 120 m² wall at 6 per m² needs 720 plugs, which is four boxes.
Above 15 m, plan on at least 8 per m² in the field and 10 per m² at corners. The insulation design sets the final number.
What about aerated concrete walls?
Rotary drilling, 60 mm holes and 50 mm of anchorage. The 120 mm plug then takes a 60 mm board on the surface of a new wall or 80 mm recessed. Characteristic pull-out: 0.50 kN from 0.35 kg/dm³, 0.60 kN from 0.65 kg/dm³.
Which walls is it assessed for?
Concrete, solid clay and calcium silicate brick, calcium silicate hollow block, perforated clay brick, Porotherm 25, lightweight concrete block and aerated concrete. Walls outside that list need pull-out tests on site.
Can I use it with stone wool?
Klimas recommends the LTX-10 for EPS and XPS polystyrene boards. For stone wool slabs, use the plug the wool system specifies.
How cold are the plugs once fitted?
Barely at all: 0.001 W/K per plug with the plate on the surface and 0.000 W/K recessed, because there is no metal in the sleeve or pin.