Base hammered 40x40mm, Satin

The Strofix bottom fastening, hammered, is an AISI 304 stainless-steel base plate for the 40 × 40 mm square railing post tube. The plate measures 100 × 100 mm with a 5 mm thickness and four Ø12 mm bolt holes arranged on a 70 mm pattern. Supplied with a satin finish.

The post socket is formed directly from the plate and sized for 40 × 40 × 2 mm square tube. The tube seats into the collar at the centre of the plate, and the plate is then bolted to the floor, slab or substrate through the four clearance holes. Because the socket is formed from the plate itself, the post sits square to the base without a separate welded joint at the plate face.

The satin finish means this base can be left exposed rather than concealed under a cover plate, which suits visible installations on terraces, balconies and interior stairs. AISI 304 stainless steel is suitable for standard interior and exterior installations.

Use cases:

• Floor-mounting 40 × 40 mm square railing post tubes to concrete slabs
• Visible base fixing for terrace and balcony railings where a satin finish is required
• Square post foundation for interior staircase railings
• Bolted post base for deck and rooftop railing systems
• Railing post base where a welded plate joint is not wanted at the floor line

FAQ:

What post tube does this base fit?

The formed socket is sized for 40 × 40 × 2 mm square post tube — 40 × 40 mm outer dimension with a 2 mm wall.

What are the plate dimensions?

The plate is 100 × 100 mm with a 5 mm thickness. Four Ø12 mm bolt holes are positioned on a 70 mm pattern.

What bolt size do the holes accept?

The Ø12 mm holes provide clearance for M10 bolts or anchor rods. Use with the Strofix M10 anchor rods, washers and nuts from the Fastenings category.

How does this differ from the base for welding?

This base has a socket formed from the plate itself and is supplied with a satin finish for exposed installations. The base for welding is a cast plate with an open aperture — the post tube passes through it and is welded, and it is supplied raw because it is normally concealed by a cover.

Is a round tube version available?

Yes. The same base is available for Ø42.4 mm round post tube. The Strofix Base, clamp category also includes further plate sizes and screw-hole configurations for both tube profiles.

About Base & Clamp Fastenings

A base or clamp fastening is a stainless-steel plate or bracket that anchors a railing post to the building structure, forming the structural foundation of the balustrade. Bottom fastenings bolt to the top of a floor slab, deck or beam, while side fastenings bolt to the vertical face of a fascia, edge beam or wall. Assembly clamps grip an existing tube or post without welding, and assembly plates provide a flat mounting surface for auxiliary connections.

Strofix supplies 18 base and clamp products for Ø42.4 mm round pipe and 40×40 mm flat-sided square posts, with plate diameters from Ø80 to Ø100 mm (round) and plate dimensions from 80×80 to 135×56 mm (rectangular/square), in satin or raw-surface stainless steel with AISI 304 and AISI 316 options.

Screw-hole configurations include 2, 3 and 4-hole variants. The correct fastening depends on mounting orientation, post profile, plate size, number of screw holes and the required surface finish.