Key Clamp Square Wall Flange for 42.4mm Tube, Galvanised

The square wall flange ends a 42.4mm rail neatly against a wall, column or upstand, on a square plate with four corner fixing holes. The rail end pushes into the closed socket and one grub screw underneath locks it. The square plate sits flat and tidy against blockwork, brick courses and steel, and the four holes near its corners spread the fixings wider than a round flange of the same size. It suits 42.4mm outside diameter tube and is malleable cast iron with a galvanised finish for indoor and outdoor use. It is made for terminating rails, not as a load-bearing base plate. The price shown is for one fitting, with a minimum order of 5.

Why use a square wall flange

A clean end at the wall. The rail finishes inside a closed socket against the wall, with no open tube end and no sharp edge where people walk past.

Square fits square. The plate lines up with brick and block courses and with the flat face of steel columns, and its edges can sit tight into a corner where a round flange would leave a gap.

Four wide-set fixings. The holes are near the corners, so the screws or anchors are spread across the full plate.

No welding. Fix the plate, push in the rail and tighten one screw with a hex key.

Galvanised for outdoors. The zinc coating protects the iron on yards, docks and outside steps in all weathers.

Where it is used

The wall end of guard rails, handrails and barrier rails in warehouses and factories, rails fixed to steel columns and upstands, loading dock edge rails, plant room and mezzanine rails meeting a wall, and rail ends on outside steps and ramps.

Specifications

Know its limits

This flange is for terminating rails to a wall or similar structure. It can be used as a base for a non-load-bearing frame, but it is not recommended as a base plate for guard rail posts or for load-bearing work. The rail cannot pass through the socket. No load rating is published, so for a rail that must meet a set load, ask a structural engineer to check the design and the wall fixings.

Which 42.4mm wall fitting?

How many do you need?

One at each rail end that meets a wall. A two-rail guard rail running from a wall needs two, one for the top rail and one for the middle rail.

Choosing the right size

Key clamps are sized by the tube's outside diameter. 42.4mm tube is often sold as 1¼" or 32mm nominal bore. Measure across the tube before ordering: this fitting will not grip 33.7mm or 48.3mm tube. The same square base fitting is made for 33.7mm and 48.3mm tube.

Fitting and care

Mark the plate position, drill and fix it to sound wall or steel with four screws, anchors or bolts up to 7.5mm to suit the surface. Push the rail fully into the socket and tighten the grub screw firmly with a 5/16" hex key. Check the screw and fixings after the first week and once a year, and touch up scratched galvanising with zinc-rich paint.

Frequently asked questions

Ordering and delivery

Order 5 or more online, with Express UK Delivery to your site and same-day dispatch on orders before 2pm, Monday to Friday. For a larger job, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.