Base for welding 40x40/80x80mm, Raw

The Strofix base for welding 40×40 / 80×80mm, RAW is an AISI 304 stainless-steel square base plate for the 40 × 40 mm square railing post tube. The plate measures 80 × 80 mm and is 4 mm thick (h), with two Ø9 mm bolt holes. Supplied with a raw (unfinished) surface. The post tube is attached by welding.

The 80 × 80 mm square plate is the most compact square base for the 40 × 40 mm post — a square plate matching the square post profile for clean alignment. The two-bolt arrangement suits lighter-duty installations, and the 4 mm plate thickness keeps it lightweight and economical. The Ø9 mm bolt holes accept M8 bolts or anchor rods. The raw surface is standard for base plates concealed by a decorative cover after installation. AISI 304 stainless steel suits standard interior and exterior installations.

Use cases:

• Compact floor mounting of 40 × 40 mm square railing post tubes
• Two-bolt anchor pattern for light-duty square post installations
• Square base plate matching a square post profile for clean alignment
• Budget base plate for 40 × 40 mm square tube railing systems
• 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.

How many bolt holes does it have?

Two Ø9 mm bolt holes (for M8 bolts).

What are the plate dimensions?

80 × 80 mm with 4 mm thickness (h) — the most compact square base plate. A square plate matches the square 40 × 40 mm post profile.

How does this compare to the larger square plates?

The 80 × 80 mm is the smallest square base. Larger options include 85 × 85 mm and 105 × 105 mm, available in different grades.

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.