Key Clamp 4 Way Centre Cross + Upright for 60.3mm Tube, Galvanised, Size E

A five way joint for 60.3mm tube: an upright passing straight through the middle and four rail sockets around it at 90 degrees. It is the fitting for the centre of a frame, where rails meet on all four sides of a post and the post carries on through. Five hex socket grub screws lock the upright and the four rails. It suits 60.3mm outside diameter tube, sold as 50mm nominal bore, and is galvanised malleable cast iron. The price shown is for one fitting, and you can order just one.

Why a centre cross works

All the joints in one casting. Where four rails meet a post, one fitting replaces a stack of tees and a lot of cutting and lining up.

The upright stays in one length. The post passes through the centre of the fitting, so the frame can carry on upwards without a joint at this level.

No hot work. Each tube is held by its own grub screw, so the frame goes up with a hex key and can be altered later.

Where it is used

Structures with several verticals: heavy duty tube frames, platform supports, staging, racking and display frames built from 60.3mm tube. It is the fitting for the intersections in the middle of a frame, not the corners or the edges, which need a different number of outlets.

Specifications

Choosing the right size

Measure the outside of your tube with a caliper rather than relying on a nominal bore size on a delivery note. This fitting is for tube that measures 60.3mm across, sold as 50mm nominal bore. The bore is cast to that size, so a smaller or larger tube will not grip properly.

See the full range of galvanised key clamp fittings.

Fitting and care

Cut every tube square and remove any burr. Slide the upright through the centre and set the height, then push a rail fully into each of the four sockets. Tighten the five grub screws evenly with a hex key until each bites firmly on its tube, and do not overdrive them. The upright cannot be joined inside this fitting.

No load rating is published for this line. If the frame has to meet a design loading, have it assessed by a competent person before it goes into use.

Check the grub screws during routine inspections of the frame, especially where it is exposed to vibration. Galvanising needs no routine care in normal conditions, and any cut tube ends or damaged areas can be touched up with a zinc-rich paint.

Frequently asked questions

Ordering and delivery

Order 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.