Bottom fastening

The Strofix bottom fastening is an AISI 304 stainless-steel satin-finished base plate for the Ø42.4 mm railing post tube, available in two plate diameters: Ø100 or Ø85 mm. Both variants have a 6 mm plate thickness (h), two bolt holes, and a satin finish. The bolt hole diameter depends on the plate size: Ø11 mm (for M10 bolts) on the Ø100 mm plate, or Ø8.5 mm (for M8 bolts) on the Ø85 mm plate. The post tube is attached by welding (elements for welding included).

The satin finish makes this base plate suitable for visible installations where no decorative cover is placed over the base. The polished surface provides a finished appearance that matches other Strofix satin-finished railing components. The two-bolt configuration provides a simpler anchor pattern than the three-bolt satin base plate (SKU SP-4210063), which may be preferred where two anchor points are sufficient for the structural loading. The 6 mm plate thickness provides greater rigidity than the 4 mm raw-surface base plates. AISI 304 stainless steel is suitable for standard interior and exterior installations.

Select the plate diameter in the dropdown at order time.

Use cases:

• Visible two-bolt base plate installations where satin finish is required
• Exposed post bases on railings where no decorative cover is used
• Compact Ø85 mm satin base for minimal-footprint visible post bases
• Standard Ø100 mm satin base with M10 two-bolt anchoring
• Residential and commercial railing installations with exposed satin post bases

FAQ:

What plate sizes are available?

Two plate diameters: Ø100 mm and Ø85 mm. Select in the dropdown at order time.

What bolt size does each plate accept?

The Ø100 mm plate has Ø11 mm bolt holes (for M10 bolts). The Ø85 mm plate has Ø8.5 mm bolt holes (for M8 bolts). Both variants have two bolt holes.

How does this differ from the 3-bolt satin base plate?

Both are satin-finished, h = 6 mm base plates for the Ø42.4 mm tube with Ø100 and Ø85 mm plate options. This product has 2 bolt holes; the 3-bolt version (SKU SP-4210063) has 3 bolt holes and also includes a Ø90 mm raw-surface variant. Choose based on the number of anchor points required.

Why satin finish instead of raw?

Satin-finished base plates are designed for visible installations where the base is not concealed by a decorative cover. The polished surface matches other Strofix satin railing components. Raw-surface base plates are intended for concealed installations under covers.

What is the plate thickness?

Both variants have a 6 mm thickness (h = 6 mm), providing greater rigidity than the 4 mm raw-surface base plates.

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.