Base for welding 40x40/105x105mm, Raw

The Strofix base for welding 40×40 / 105×105mm, RAW is an AISI 316 stainless-steel square base plate for the 40 × 40 mm square railing post tube. The plate measures 105 × 105 mm with a raw (unfinished) surface. The post tube is attached by welding. Made from marine-grade AISI 316 stainless steel.

The 105 × 105 mm square plate gives a substantial square footprint matching the 40 × 40 mm square post profile — square plate for square post, for clean alignment. AISI 316 provides marine-grade corrosion resistance, suited to coastal, pool, and high-humidity installations. The raw surface is standard for base plates concealed by a decorative cover after installation. This is one of the larger square base plates in the range.

Use cases:

• Floor mounting of 40 × 40 mm square railing post tubes
• Square base plate matching a square post profile for clean alignment
• Marine-grade AISI 316 square post base for coastal installations
• Larger 105 × 105 mm footprint for higher-load square post bases
• Welded square post bases concealed by a decorative cover

FAQ

What post tube does this base plate fit?

The 40 × 40 mm square post tube — the square railing post profile in the Strofix range.

What steel grade is used?

AISI 316 stainless steel — marine grade, suited to coastal, pool, and high-humidity installations.

What are the plate dimensions?

105 × 105 mm square. A square plate matches the square 40 × 40 mm post profile.

How is the post tube attached?

The post tube is welded to the base plate using TIG or MIG welding.

Why is the surface raw?

The raw finish is standard for base plates that are concealed by a decorative cover after installation.

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.