Key Clamp Slide-Over Locking Ring for 48.3mm Tube, Galvanised Support Collar, Size D

The locking ring is a plain collar that clamps to a tube with one grub screw, to stop another fitting sliding down it or to carry a load. Slide it onto the tube, push it up tight under the fitting above, and tighten the screw. It is the simple fix for a shelf or rail that creeps down a post under weight, and the usual bearing collar under a heavy gate hinge. 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 ring, with a minimum order of 10.

Why use a locking ring

A second grip under a loaded fitting. Every key clamp holds by its grub screw biting into the tube. On racking, shelving and frames carrying heavy stock, that load can be more than one screw should hold. A locking ring clamped directly underneath takes the extra weight, so the fitting above cannot slip.

A bearing collar for gate hinges. On a tube gate post, the ring sits under the hinge and carries the gate's weight, while the hinge above turns freely on the post.

Stops fittings that are meant to turn from sliding. Swivels and hinge collars left loose to rotate can still drop down the tube; a ring under them keeps them at height.

Low cost and quick. One screw, no drilling, and it can be moved or added to a frame at any time, as long as you can slide it on from the tube end.

Where it is used

Tube storage racking and shelving, garment and display rails carrying heavy stock, gate posts on farms and yards, swing and play frames, machine and workbench frames, and as an end stop on a horizontal tube.

Specifications

Where it goes in a frame

How many do you need?

One ring under each fitting that carries a heavy load. On a storage rack, that is one per shelf rail fitting on each upright.

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 ring will not grip 42.4mm or 60.3mm tube. Other sizes of the same ring:

• 42.4mm locking ring for standard handrails
• 33.7mm locking ring
• 26.9mm locking ring

Fitting and care

Slide the ring onto the tube from its end before fitting anything that blocks it. Push it up hard against the underside of the fitting it supports, then tighten the grub screw firmly with a 5/16" hex key until it bites into the tube. Check it after loading the frame for the first time, after a 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 larger job, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.