Black Square Key Clamp Long Tee for 25 x 25mm Box Section, Indoor Use

The black square key clamp long tee joins a vertical post to the top rail at 90° on a straight, level indoor frame, with a long T shaped body that grips the rail over 87mm. The rail runs through the long bar, or two rail lengths meet inside it, and the post pushes up into the leg below. Three hex socket grub screws lock them, one at each end of the bar and one in the leg. It suits 25 x 25mm square box section and is malleable cast iron with a black electrophoretic coat, so black square tube frames can be built without welding. It is for indoor use only. The price shown is for one fitting, with a minimum order of 5.

Why use a black square long tee

A longer grip on the rail. The long bar holds the rail over a greater length than the short tee, for a stiffer joint.

Join two rail lengths at a post. With a screw at each end of the bar, two lengths of rail can meet inside the fitting over a post.

No welding. Square box section frames go together with a hex key and can be taken apart, altered or extended later.

A clean, modern look. Square section suits architectural handrails, shop fitting, display frames and furniture where a round tube would look out of place.

A neat dark finish. The black coat suits black box section in shops, bars, cafés, offices and homes.

Where it is used

Indoor square section handrails and balustrades, clothes and display rails, shop fitting frames, benches, tables and workstations, shelving, room dividers and any black indoor frame built from 25 x 25mm box section.

Specifications

Letters refer to the dimension drawing above. Dimensions are for guide only and may vary slightly.

Know its limits

It fits 25 x 25mm square box section only; it will not grip round tube or other square sizes. The electrophoretic coat is for indoor use only and will rust outdoors. No load rating is published; for a frame that must carry a set load, ask a structural engineer to check the design.

Which 25 x 25mm square fitting?

How many do you need?

One at each joint of this type. Sketch the frame, mark each joint and count the fittings for each type before you order.

Choosing the right size

Square key clamps are sized by the outside of the box section. Measure across the flats of your tube: this fitting suits 25 x 25mm. For outdoor frames, use the galvanised 25 x 25mm long tee, which is the same shape with a zinc coating.

Fitting and care

Cut the box section square and deburr the ends. Push the post up into the leg and tighten its screw. Slide the rail into the bar, set it level and tighten both bar screws firmly with a hex key. Check the screws after the first week and once a year after that. Touch up chips with black paint and wipe clean with a damp cloth.

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 black frame kit, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.