Convex end cap

The Strofix convex end cap is an AISI 304 stainless-steel end cap with a gently curved outward profile, designed to close the open end of the Ø42.4 × 2 mm railing tube. The cap has a 6 mm height (H) and is supplied in satin finish. The cap is installed by driving it into the tube bore (elements for driving included).

The convex shape creates a subtle outward curve that rises slightly above the tube face, providing a finished appearance with minimal visual prominence. At 6 mm, the profile is just enough to be visible as a rounded closure without the height of the ellipsoid (H = 24 mm) or dome (H = 42 mm) caps. The press-fit attachment means no adhesive or screws are required — the cap is driven into the tube bore for a secure fit. This SKU is a single fixed configuration for the Ø42.4 × 2 mm tube in satin finish. AISI 304 stainless steel is suitable for standard interior and exterior installations.

The satin finish provides a uniform appearance that matches other Strofix satin-finished railing components.

Use cases:

• Subtly curved tube end closure on Ø42.4 mm handrail and railing post tubes
• Railing terminations where a flat cap is too minimal but a taller dome is not desired
• Handrail end finishing with a gentle convex profile for a refined appearance
• Staircase and balcony railing tube end closures with a low-profile curve
• Post tube top finishing where a slight dome provides visual definition without prominence

FAQ:

What tube does this end cap fit?

The convex end cap fits the Ø42.4 × 2 mm round tube — the standard railing pipe in the Strofix product range.

What is the cap height?

The cap has a 6 mm height (H = 6 mm). This creates a gentle convex curve above the tube face.

What does "convex" mean in this context?

The convex profile is a subtle outward curve — slightly domed but much lower than a full dome or ellipsoid cap. It provides just enough curvature to be visible as a rounded closure without extending significantly beyond the tube face.

How does this compare to other Strofix end cap profiles?

The End Caps range offers four profile shapes for the Ø42.4 mm tube: flat press-fit (H = 2–3 mm, near-flush), this convex cap (H = 6 mm, subtle curve), ellipsoid (H = 24 mm, moderate dome), and dome (H = 42 mm, hemispherical). Choose based on the desired visual prominence of the tube end closure.

How is this cap installed?

The cap is installed by driving (pressing or tapping) it into the tube bore. This is a press-fit attachment — no adhesive or screws are used.

What steel grade and finish is used?

The convex end cap is manufactured from AISI 304 stainless steel with a satin finish. AISI 304 is suitable for standard interior and exterior installations.

About End Caps

An end cap is a stainless-steel closure piece that plugs into or fits over the open end of a railing tube, post or solid bar, sealing it against moisture ingress and giving the termination a clean, finished appearance. Without an end cap, the cut tube end is exposed — visually unfinished and prone to collecting water and debris inside the hollow section.

Strofix supplies 13 end cap products in three profile families: caps for Ø42.4 mm round pipe (available in flat, convex and ellipsoid shapes), caps for 40×40 mm flat square tube (flat profile), and caps for Ø10 and Ø12 mm solid crossbar rods.

All are in AISI 304 stainless steel with a satin finish, with AISI 316 and polished options available on selected variants. The correct end cap depends on the tube or rod profile it will close, and the desired cap shape.