Bottom fastening with 2-4 screws (D100)

The Strofix bottom fastening with 2–4 screws (D100) is an AISI 304 stainless-steel round base plate for the Ø42.4 mm railing post tube. The plate has a Ø100 mm diameter (D), 4 mm thickness (h), and is available with two, three, or four Ø11 mm bolt holes (for M10 bolts). Select the number of screws in the dropdown at order time. Supplied with a raw (unfinished) surface. The post tube is attached by welding (elements for welding included).

The Ø100 mm round plate provides a larger bearing area than the compact D80 base plate, and the Ø11 mm bolt holes accept M10 bolts — a step up from the M8 bolts on the D80. The three screw-count options (2, 3, or 4) allow the installer to match the anchor pattern to the structural requirements: two for light loads, three for asymmetric triangular stability, four for maximum hold. This is the most configurable raw-surface base plate for the Ø42.4 mm round tube in the Strofix range. AISI 304 stainless steel is suitable for standard interior and exterior installations.

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

Use cases:

• Floor mounting of Ø42.4 mm round railing posts with a Ø100 mm base footprint
• Configurable 2/3/4-bolt anchor patterns for varying structural requirements
• Standard residential and commercial railing post base installations
• M10 bolt anchoring for increased load capacity compared to M8 options
• Larger base plate where the D80 compact plate does not provide sufficient bearing area

FAQ:

What post tube does this base plate fit?

The base plate fits the Ø42.4 mm round post tube — the standard railing pipe in the Strofix product range.

How many bolt holes are available?

Three options: 2, 3, or 4 bolt holes. All use Ø11 mm holes for M10 bolts. Select in the dropdown at order time.

What are the plate dimensions?

The plate is Ø100 mm diameter (D) with a 4 mm thickness (h).

How does this compare to the D80 base plate?

The D80 base plate has a smaller Ø80 mm plate with Ø8.5 mm holes for M8 bolts and 2–3 screw options. This D100 plate has a larger bearing area, larger bolt holes for M10, and adds a 4-bolt option. Choose based on the required footprint, bolt size, and number of anchor points.

What bolt size do the holes accept?

The Ø11 mm bolt holes provide clearance for M10 bolts or anchor rods. Use with the Strofix M10 anchor rods, washers, and nuts from the Fastenings category.

How is the post tube attached?

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

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.