Key Clamp Heavy Duty Base Flange for 48.3mm Tube, Four Hole Post Fixing, Galvanised

The heavy duty base flange stands a 48.3mm tube post on a floor or deck where a standard base plate would be too light. A tall cast body with deep ribs carries the post down onto a square plate with a 12mm fixing hole at each corner, and hex socket grub screws lock the post in place. It is the base to choose where a post has to take higher loads. It is malleable cast iron with a galvanised finish for indoor and outdoor use. The price shown is for one fitting.

Why use a heavy duty base flange

Four fixing points. A hole at each corner spreads the load into the floor in every direction, where a two-hole oval base flange resists mainly across its long side.

A deep, ribbed body. At 110mm tall, the ribbed body gives the post a long grip and keeps it upright under a heavier push.

No welding. The post pushes into the socket and locks with a hex key, so posts can be set, plumbed and changed on site.

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

Where it is used

Heavier guard rails and barrier posts, loading bays and dock edges, car parks, plant platforms and walkways, machine guards and any 48.3mm tube frame where the post has to take more load than a standard base plate would.

Specifications

Dimensions are for guide only and may vary slightly.

Know its limits

No load rating is published for this fitting. The strength of a post depends on the floor, the anchors and the post spacing as well as the base, so for a guard rail that must meet a set load, ask a structural engineer to check the design.

Which base do you need?

For most pedestrian rails, the lighter oval base flange is enough. Choose this heavy duty base where the post takes more load or may be knocked. Posts and rails can be cut from 48.3mm galvanised tube.

How many do you need?

One for every post. A straight barrier with posts at 2 metre centres needs three for 4 metres, six for 10 metres and eleven for 20 metres, and each base takes four anchors or bolts.

Choosing the right size

48.3mm is standard scaffold tube, often sold as 1½" or 40mm nominal bore. Measure across the tube before ordering: this fitting will not grip 42.4mm or 60.3mm tube.

Fitting and care

Set out the posts, mark the four holes in each plate and drill to suit your anchors, then fix the plate down firmly on a sound, level floor. Cut each post square, deburr it and push it fully into the socket. Plumb the post and tighten the grub screws with a 5/16" hex key. Check the anchors and screws after the first week and once a year. Touch up scratched galvanising with 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 full barrier or a larger job, call 01744 520 110 or email sales@industrialsuppliesco.co.uk and we will confirm availability and delivery before you order.