Black Key Clamp Long Tee for 33.7mm Tube, Electrophoretic, Indoor, Size B

The black long tee carries a slim top rail over a post, and is the fitting to use where two lengths of rail meet. Its long barrel takes the rail straight through, or the ends of two rails pushed in from each side, and each is locked by its own grub screw; the post pushes up into the socket below with a third screw. It suits 33.7mm outside diameter tube, the slim size used for indoor handrails, shop frames and furniture, and is malleable cast iron with a black electrophoretic coat, for indoor use only. The price shown is for one fitting, with a minimum order of 5.

Why use a long tee

Joins rail lengths over a post. Tube comes in fixed lengths, so any run of rail longer than one tube has joints. The long tee's barrel takes two rail ends, each with its own screw, so the joint sits over a post where it is fully supported and cannot sag.

Three screws, more grip. Two screws on the barrel and one on the post socket hold the rail and post firmly, even where the rail is a single length through.

No welding, no threading. Everything goes together with a hex key. Rails and frames can be built on site, adjusted and taken down again.

A neat black finish. The smooth black coat matches black tube, so rails and frames look finished in offices, shops, homes and cafés.

Where it is used

Indoor handrails along landings and mezzanines, shop display and clothes rails, office and reception dividers, bar and café rails, and the top rails of black tube shelving, benches and furniture made from 33.7mm tube.

Specifications

Indoors only

The electrophoretic coat is a thin, even paint layer that looks smart but does not protect the iron outdoors. Do not use this tee outside or in wet areas, where it will rust. For outdoor rails choose the galvanised 33.7mm long tee.

Long tee or short tee?

Use the long tee wherever two lengths of top rail meet over a post. Where the rail runs straight over a post in one length, the black 33.7mm short tee does the job at lower cost. A short tee cannot join two rails inside it.

Which black 33.7mm fitting goes where

How many do you need?

One long tee at every post where two top rail lengths meet. With 3 metre tube and posts at 1.5 metres, a joint falls on every second post.

Choosing the right size

Key clamps are sized by the tube's outside diameter. 33.7mm tube is often sold as 1" or 25mm nominal bore. Measure across the tube before ordering: this fitting will not grip 26.9mm or 42.4mm tube. The same black fitting is made for 26.9mm tube. For outdoor use, choose the galvanised 33.7mm version.

Fitting and care

Push the post fully into the socket. Cut rail ends square and deburr them, then push each rail into the barrel so the two ends meet in the middle. Level the rail and tighten all three grub screws with a hex key. Check the screws after the first week and once a year. Touch up any chips in the coat with black 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 rail kit, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.