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Description
A pressed steel half ball, 120mm across, the domed cap for 114.3mm bollards, columns and posts. This hemisphere is pressed from mild steel sheet 2 to 3mm thick, 120mm across the open rim and about 60mm high, smooth on the outside and hollow underneath. Weld it over the end of a 114.3mm tube for a rounded, weather-tight top, or weld two together to make a 120mm hollow ball. It weighs about 0.41 kg. The price shown is for one hemisphere, with a minimum order of 5.
Why choose this hemisphere
Made for 114.3mm tube. The 120mm rim sits on the end of standard 114.3mm round tube with a few millimetres of overhang to weld to, the classic bollard dome.
Seals the column. A welded dome keeps rain out of bollards and canopy columns, so they do not fill with water and rust from the inside.
Rounded and safe. A smooth domed top has no sharp edges, ideal at schools, car parks and pedestrian areas.
Light to handle. At about 0.41 kg it is easy to hold in place and tack, and the 2 to 3mm wall welds without burning through.
Where it is used
School, car park and street bollards, carport and canopy columns, barrier posts, play equipment, garden features and sculpture, and vessel ends in fabrication work.
Specifications
| What you get | One hemisphere, minimum order 5 |
|---|---|
| Diameter | 120mm across the open rim |
| Height | About 60mm |
| Wall thickness | 2.0 to 3.0mm |
| Construction | Pressed, hollow, open underneath |
| Material | Mild steel |
| Finish | Raw, unpainted |
| Weight | About 0.41 kg |
| Fixing | Weld on |
The height is measured from the side photo and rounded, so allow a few millimetres either way.
Which tube does it suit?
| Tube or post you are capping | How the 120mm dome fits |
|---|---|
| 114.3mm round tube | Sits on the end with a slight overhang, weld all round, the best match |
| 101.6mm round tube | Overhangs about 9mm all round, a mushroom-head look |
| 100mm or 120mm square box | Weld a flat cap plate first, then the dome on top |
| 139.7mm tube | Too small, choose the 150mm dome |
Is this the right hemisphere?
| You want | Choose |
|---|---|
| A 120mm hollow half ball | This hemisphere |
| A smaller hollow half ball | 100mm hollow hemisphere |
| A larger hollow half ball | 150mm hollow hemisphere |
| A heavy solid 120mm ball | 120mm solid sphere |
| A heavy solid 125mm ball | 125mm solid sphere |
| Every sphere and hemisphere | All spheres and hemispheres |
Fitting and care
Cut the tube square and remove the burr. Clean the rim and the tube end back to bright steel, sit the dome centred on the end, tack it at four points opposite each other, then weld round in short runs, keeping the heat down on the thin wall. Dress the weld with a flap disc for a smooth line.
Degrease, then prime with a zinc-rich or metal primer before painting. Hot-dip galvanising after welding gives the longest life outdoors; drill a small vent hole low down on the column so it galvanises safely.
Frequently asked questions
Is the price for one hemisphere?
Yes, it is for one half ball, with a minimum order of 5. Use two to make a full sphere.
Is it solid?
No. It is a pressed shell 2 to 3mm thick, hollow and open underneath.
Will it fit 114.3mm tube?
Yes. The rim is 120mm across, so it sits on the end of 114.3mm tube with a little overhang to weld round.
Is it painted?
No. It is raw steel and will rust if left bare outdoors, so prime and paint it, or galvanise it, once it is welded on.
Is the rim exactly round?
Pressed parts vary slightly, so the rim may be a millimetre or two out of round. Tack at four points and ease it into place before welding round.
Ordering and delivery
Order 5 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.
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About Us
Suppliers to Ministry of Defence, NATO, US Airforce and Most UK Councils, Schools, Universities, Hospitals & various Government departments
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Minimum order 5 pcs