Key Clamp 90° Elbow for 48.3mm Tube, Guard Rail End Post Corner, Galvanised, Size D

The 90° elbow joins the top rail to the end post of a guard rail, turning the tube through a right angle in one neat, rounded fitting. The rail end pushes into one socket and the post end into the other, and each is locked by its own grub screw. It is the standard fitting for the top corner of an end post on straight and level guard rails, and for any frame where two tubes meet at a closed 90° corner. It suits 48.3mm outside diameter tube, the same size as scaffold tube, and is malleable cast iron with a galvanised finish for indoor and outdoor use. The price shown is for one fitting, with a minimum order of 5.

Why use a 90° elbow

A clean, closed corner. The rail and post ends finish inside the fitting, so there is no open tube end or sharp edge at the top of the post.

Rounded and safe to hold. The smooth outer curve is comfortable under the hand where a handrail turns down into its end post.

No welding or bending. Cut the tubes square, push them in and tighten two screws with a hex key. Corners can be taken apart and moved later.

Galvanised for outdoors. The zinc coating protects the iron on yards, loading bays, car parks and roofs in all weathers.

Where it is used

The top of end posts on two-rail guard rails, barriers round yards, bin stores and cycle shelters, edge protection on loading docks and flat roofs, frames for racks, benches and machine guards, and any 48.3mm scaffold-tube frame that needs a right-angle bend.

Specifications

Know its limits

Both sockets are closed, so neither tube can pass through. For a corner where the post carries on below a rail, or rails meet from two directions, use a three way corner instead. No load rating is published, so for a guard rail that must meet a set load, ask a structural engineer to check the design.

Which 48.3mm fitting goes where?

How many do you need?

One at the top of each end post. A straight guard rail with a post at each end needs two elbows, plus short tees on the intermediate posts. A U-shaped run needs elbows only at its two free ends, with three way corners at the turns.

Choosing the right size

Key clamps are sized by the tube's outside diameter. 48.3mm is standard scaffold tube, often sold as 1½" or 40mm nominal bore. Measure across the tube: this elbow will not grip 42.4mm or 60.3mm tube. The same galvanised elbow is also listed for 60.3mm tube.

Fitting and care

Push the post fully into the lower socket and the rail fully into the side socket, check the frame is square, then tighten both grub screws firmly with a 5/16" hex key. Check the screws after the first week and once a year after that, 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 full guard rail, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.