Key Clamp Offset Crossover for 26.9mm Tube, Galvanised

The 26.9mm offset crossover lets two tubes cross at a right angle without cutting either one. It is a single casting with two barrels side by side at 90°: one tube slides through the first barrel, the second tube slides through the other, and a grub screw in each barrel locks its tube. The tubes pass each other touching, with their centre lines 33mm apart, so a shelf rail can run straight past an upright in one length. It suits 26.9mm outside diameter tube and is malleable cast iron with a galvanised finish for indoor or outdoor use. The price shown is for one fitting, with a minimum order of 10.

Why use an offset crossover

No cutting at the joints. With a cross or a tee, every rail has to be cut at every post. With the offset crossover, a shelf rail can run the full length of a rack in one piece and simply pass each upright. That means fewer cuts, fewer fittings and a straighter rail.

Each tube is held on its own. There is one grub screw for each tube, so you can set an upright plumb and lock it, then slide the rail to the height you want and lock that, without disturbing the first tube.

Adjustable and reusable. Shelves can be moved up or down by loosening one screw. When the rack is no longer needed, it comes apart with a hex key and goes back up somewhere else.

No hot work. There is no welding, drilling or threading, and no damaged galvanising to repair.

Where it is used

Tube shelving and racking in stores and workshops, garment and stock rails, cross bracing on tube frames, workbench and machine frames, display stands, garden and polytunnel frames, and sports net and play frames built from 26.9mm tube.

Specifications

Offset crossover, clamp-on crossover or cross?

How many do you need?

You need one fitting at every point where one tube crosses another. For a single bay of shelving with four uprights and a rail along the front and back of each shelf, every shelf level takes four. Add side rails across the ends and it takes eight.

Choosing the right size

Key clamps are sized by the tube's outside diameter. 26.9mm tube is often sold as ¾" or 20mm nominal bore. Measure across the tube before ordering: this fitting will not grip 21.3mm or 33.7mm tube. The same galvanised fitting is made for 33.7mm, 42.4mm, 48.3mm and 60.3mm tube.

Fitting and care

Cut tube ends square and deburr them so they slide through the barrels freely. Thread the fittings onto the tubes in order before closing up the frame, as the barrels do not open. Set the uprights plumb and the rails level, then tighten each grub screw firmly with a hex key until it bites into the tube. Check the screws after the first week and once a year after that. Touch up scratched galvanising with zinc-rich paint.

Frequently asked questions

Ordering and delivery

Order 10 or more online, with Express UK Delivery to your site and same-day dispatch on orders before 2pm, Monday to Friday. For a full racking kit or a larger job, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.