Flat-end cap 40x40x2mm, Satin

The Strofix flat-end cap is an AISI 304 or AISI 316 stainless-steel low-profile cap designed to close the open end of the 40 × 40 × 2 mm square railing tube. The cap has a 5 mm height (H) and is supplied in satin finish. Attached using adhesive (elements for pasting included).

The flat-end cap inserts into or sits on the cut end of the 40 × 40 mm square tube, providing a clean, flat closure. The 5 mm height creates a minimal, near-flush profile that does not extend visibly beyond the tube face. The 40 × 40 × 2 mm specification matches the Strofix square tube from the Pipes, bars range, ensuring a precise fit. It is available in AISI 304 or AISI 316, satin. AISI 304 suits standard interior and exterior installations; AISI 316 is the choice near the sea, around outdoor pools or where de-icing salt is used.

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

Use cases:

• Closing the open end of 40 × 40 mm square railing post tubes
• Finishing square post tops where no handrail connection is made
• Providing a flat, flush closure on square tube ends for a minimalist appearance
• Sealing cut square tube ends to prevent moisture ingress in exterior railings
• Completing square tube railing systems with a clean end detail

FAQ:

What tube does this flat-end cap fit?

The flat-end cap fits the 40 × 40 × 2 mm square tube – the standard square railing tube in the Strofix product range.

What is the cap height?

The cap has a 5 mm height (H = 5 mm), creating a flat, near-flush profile on the tube end.

How is the flat-end cap attached?

The cap is attached using adhesive (pasting). It inserts into the tube end and is glued in place. Screwing elements are not used.

Are there other flat-end cap products for 40 × 40 mm square tube?

Yes. The Strofix End Caps category includes another flat-end cap for the same 40 × 40 × 2 mm tube (SKU GK40405S-04/1S). That version has an M8 thread for bolting a fitting to the post end; this one has no thread.

What steel grade and finish is used?

The flat-end cap is manufactured from AISI 304 or AISI 316 stainless steel with a satin finish.

Is this compatible with the Strofix 40 × 40 mm square tube?

Yes. The 40 × 40 × 2 mm specification matches the Strofix square tube exactly.

About End Caps

An end cap closes the open end of a railing tube, post or crossbar rod, keeping water and dirt out and giving the end a clean, finished look.

Strofix supplies 31 end caps in three families: for Ø42.4 mm tube (flat, convex, ellipsoid, 90° elbow and weld-in caps), for 40 × 40 mm profile (flat and weld-in caps) and for Ø10 and Ø12 mm crossbar rods (15–30 mm high, in flat, ball and droplet shapes).

Most are AISI 304 satin; polished versions, raw weld-in caps and AISI 316 on selected caps complete the range. The correct end cap depends on the profile it closes, the shape and whether it is fitted or welded.