Stair tread bolt Set 22B for 9–12 mm thick steel stringers

Stair tread bolt Set 22B – drilled-recess fixing to steel stringers

LamiFIX Set 22B connects wooden treads with a drilled recess to 9–12 mm thick steel stringers. The connector sits in the tread hole and is covered by a cap. Each tread can be removed individually.

Design and installation

The fixing passes through a Ø16 mm hole in the steel stringer. The round nut and spacer sleeve are made of INOX A2 stainless steel. The spacer sleeve has a diameter of Ø25 mm and creates an 18 mm gap to the tread. The round nut head has a diameter of Ø30 mm.

The M10 thread of LamiFIX connector LF 35.M10x30 is shortened to 19.5 mm for Set 22. The spacer sleeve and round nut clamp the steel stringer firmly and precisely. Secure the thread with threadlocker. Fit the predrilled wooden tread and screw it from below. Version B is suitable for straight and winding stairs.

Light appearance, straightforward manufacture

The steel stringer can arrive for installation fully laser-cut and powder-coated. No additional welded brackets are needed, which also makes transport easier. The gap between the wooden tread and steel stringer gives the treads a floating appearance.

Required quantity per Set

• 1 LamiFIX M10 connector, LF 35.M10x30 (catalogue LF 1035.130)
• 1 hex head screw 6.3 × 32 mm, LF 1560.003.1
• 1 INOX Decor cover cap, LF 1435.001.1
• 1 cut to shorten the M10 thread on the LamiFIX connector to 19.5 mm
• 1 spacer sleeve Ø25 × 18 mm, INOX A2, LF 3624.018
• 1 round nut M10, INOX A2, LF 3813.030.1
• 1/100 threadlocker LF 3806.243.1

The component list shows the quantities required per Set. Screws are supplied in whole packs and threadlocker in whole tubes. Final quantities depend on the number of Sets.

Article number: LF 3614.222.4
For 100 Sets or more: LF 3614.222.6
For steel stringers 9–12 mm thick. Set 21 is intended for stringers 6–9 mm thick.