Stair tread bolt Set 7A with acoustic isolation for concrete walls

Stair tread bolt Set 7A – acoustically isolated fixing in concrete

LamiFIX stair tread bolt Set 7A fixes treads to the side of concrete walls. Version A is designed for grooved treads. The connector sits in the groove and remains largely hidden, providing a discreet, almost invisible connection.

Installation in concrete

The stair anchor is inserted into the concrete wall with the acoustic plug. The wall rosette covers the junction with the wall. The plaster must not exceed 15 mm in thickness. According to catalogue page 22, the wall hole must be 85 mm deep and 25 mm in diameter.

Acoustic isolation

Installation with acoustic isolation is recommended for apartment buildings. For single-family homes, it can generally be omitted.

Installation and drilling template

Wall holes must be drilled on site accurately in angle and position. Installation uses an acoustic plug.

For stairs without stringers, we lend matching drill bushes free of charge for up to three months. Installation using a template and drill bushes is shown in the LamiFIX catalogue on page 26 . For concrete, use the matching bushes for masonry drill bits.

Matching installation accessories

The Ø25 mm SDS-plus Quadro X concrete drill bit, LF 2060.250.3, and Ø25 mm SDS-plus rebar drill bit, LF 2070.250.3, are available separately.

Required quantity per Set

• 1 type A/B stair anchor, T=78 mm, M10, LF 3623.102.1, zinc-plated steel with INOX Decor cover sleeve
• 1 LamiFIX M10 connector, LF 35.M10x30 (catalogue LF 1035.130)
• 1 raised countersunk screw 5.5 × 32 mm, LF 1541.002.1
• 1 acoustic plug, LF 1620.016.1
• 1 wall rosette, LF 1801.025.1
• 1/6 adjustment washer, LF 3605.002.1
• 1/100 threadlocker, LF 3806.243.1

Article number: LF 3623.107.4
For 100 Sets or more: LF 3623.107.6

Installation tip

Drill the wall hole to Ø25 mm. The acoustic plug is slightly oversized and is driven into the hole with a rubber mallet. Moisten it with a little soapy water before driving it in. This reduces friction and makes installation easier.