Key Clamp Sinkable Ground Socket for 48.3mm Tube, Flush Concrete Base for Removable Posts, Galvanised

The sinkable ground socket is cast into concrete flush with the finished ground, so a 48.3mm post can stand in it and be lifted out when it is not needed. The post drops into the socket and one grub screw in the flange holds it. Loosen the screw, lift the post out, and only a flat round flange is left level with the surface, with nothing to trip over or drive into. Lugs on the body key it into the concrete. It suits 48.3mm outside diameter tube, the same size as scaffold tube, and is malleable cast iron with a galvanised finish for outdoor use. The price shown is for one socket.

Why use a ground socket

Removable posts. Barriers, rails and posts can come out for deliveries, events, maintenance or cleaning, then go straight back in the same place.

Nothing left sticking up. With the post out, the flange sits flush with the ground, so vehicles, trolleys and people pass over it safely.

No surface fixings. The socket is cast in, so there are no anchor bolts to work loose or base plates to trip on.

Galvanised for outdoors. The zinc coating protects the iron in yards, car parks and paths in all weathers.

Where it is used

Removable barrier and guard rail posts in car parks and loading yards, posts that must come out for deliveries or events, temporary pedestrian routes, sports and play area rails, and permanent posts where a neat, flush base is wanted.

Specifications

Know its limits

The socket needs a sound concrete surround to work; it is not made to be bolted down or set in soil. The post is held by one grub screw, so for barriers that may be hit by vehicles, a permanent fixing or a dedicated vehicle barrier is the better choice. No load rating is published, so for a barrier that must meet a set load, ask a structural engineer to check the design and the concrete.

Which 48.3mm post base?

How many do you need?

One for each removable post. A removable barrier across a 6m opening with posts every 2m needs four sockets. Cast spare sockets where you may want to add posts later.

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 socket will not grip 42.4mm or 60.3mm tube. The same socket is made for 33.7mm and 42.4mm tube.

Fitting and care

Core or dig a hole deep enough to surround the whole body with concrete. Set the socket with the flange level and flush with the finished surface, with a length of tube in it to keep it plumb, and pour the concrete round it. Once cured, drop the post in and tighten the grub screw with a 5/16" hex key. Keep the screw greased so it stays free, and fit a blanking cap when the post is out if grit gets in.

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.