Convex end cap

The Strofix convex end cap is a stainless-steel end cap with a gently curved outward profile, designed to close the open end of Ø42.4 × 2 mm or Ø48.3 × 2 mm railing tubes. All variants share a fixed 7 mm height (H). Available in AISI 304 satin for both tube sizes, with AISI 304 polished and AISI 316 satin also available for Ø42.4 × 2 only. 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. The 7 mm height is consistent across both tube sizes, maintaining a uniform look when Ø42.4 and Ø48.3 mm tubes are used in the same installation. Surface finish, tube diameter, and steel grade are selected independently at order time, but note that polish and AISI 316 are only available for the Ø42.4 × 2 variant. AISI 304 is suitable for standard installations; AISI 316 contains molybdenum for higher chloride resistance in coastal or high-humidity environments.

The satin finish matches other Strofix satin-finished components. The polished finish (Ø42.4 only) provides a mirror-like appearance.

Use cases:

• Subtly curved tube end closure on Ø42.4 mm and Ø48.3 mm handrail and railing post tubes
• Coastal and pool railing installations with AISI 316 convex end caps (Ø42.4 mm)
• High-gloss railing terminations with polished convex end caps (Ø42.4 mm)
• Railing systems mixing Ø42.4 and Ø48.3 tubes where a uniform 7 mm cap height is desired
• Handrail end finishing with a gentle convex profile in satin, polish, or marine-grade steel

FAQ:

What tube sizes does this end cap fit?

Two tube sizes are available: Ø42.4 × 2 mm and Ø48.3 × 2 mm. Select the tube size in the dropdown at order time.

What is the cap height?

All variants have a fixed 7 mm height (H = 7 mm), regardless of tube size. This differs from the other convex end cap in the range, which has H = 6 mm for Ø42.4 and H = 8 mm for Ø48.3.

Which finish and grade combinations are available?

The Ø42.4 × 2 variant is available in three combinations: AISI 304 satin, AISI 304 polish, and AISI 316 satin. The Ø48.3 × 2 variant is available in AISI 304 satin only. Polish and AISI 316 are not offered for Ø48.3.

When should I choose AISI 316?

AISI 316 contains molybdenum for higher resistance to chlorides and salt air. Specify AISI 316 for coastal, pool, and high-humidity installations. Available for Ø42.4 only on this SKU.

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.

How does this differ from the other convex end caps?

The Strofix range includes three convex end cap products. This one (H = 7 mm fixed for both tubes) offers the widest finish and grade selection including polish and AISI 316. The single-tube convex cap fits Ø42.4 only at H = 6 mm. The dual-tube convex cap has H = 6 mm for Ø42.4 and H = 8 mm for Ø48.3. Choose based on the desired height, tube compatibility, and finish/grade requirements.

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.