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Description
A pressed steel half ball, 70mm across, a domed cap for 60.3mm and 63.5mm tube posts, mooring posts and play frames. This hemisphere is pressed from mild steel sheet 2 to 3mm thick, 70mm across the open rim and about 35mm high, smooth on the outside and hollow underneath. Weld it over the end of a round tube for a rounded, weather-tight mushroom-head top, or weld two together to make a 70mm hollow ball. It weighs about 0.11 kg. The price shown is for one hemisphere, with a minimum order of 10.
Why choose this hemisphere
A mushroom-head finish. On 60.3mm tube the 70mm dome overhangs about 5mm all round, the classic look for mooring posts, bollards and play frames; on 63.5mm tube it sits almost flush.
Seals the post. A welded dome keeps rain out of the tube, so posts do not fill with water and rust from the inside.
Rounded and safe. A smooth dome removes sharp tube ends, ideal on playgrounds, towpaths and public areas.
Light and quick to fit. At about 110 grams it is easy to hold in place and tack, and the 2 to 3mm wall welds without burning through.
Where it is used
Mooring posts and marina bollards, playground and climbing frame uprights, handrail and barrier posts, fence posts, garden structures, and small ball finials made from two halves.
Specifications
| What you get | One hemisphere, minimum order 10 |
|---|---|
| Diameter | 70mm across the open rim |
| Height | About 35mm |
| Wall thickness | 2.0 to 3.0mm |
| Construction | Pressed, hollow, open underneath |
| Material | Mild steel |
| Finish | Raw, unpainted |
| Weight | About 0.11 kg |
| Fixing | Weld on |
The height is measured from the side photo and rounded, so allow a millimetre or two either way.
Which tube does it suit?
| Tube or post you are capping | How the 70mm dome fits |
|---|---|
| 63.5mm round tube | Sits almost flush, weld all round |
| 60.3mm round tube | Overhangs about 5mm all round, a mushroom-head look |
| 50mm or 60mm square box | Weld a flat cap plate first, then the dome on top |
| 76.1mm tube | Too small, choose an 80mm dome |
Is this the right hemisphere?
| You want | Choose |
|---|---|
| A 70mm hollow half ball | This hemisphere |
| A flush cap for 60.3mm tube | 60mm hollow hemisphere |
| A cap for 76.1mm tube | 80mm hollow hemisphere |
| A ready-made 70mm hollow ball | 70mm hollow sphere |
| A solid 70mm ball | 70mm 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 post 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 10.
Is it solid?
No. It is a pressed shell 2 to 3mm thick, hollow and open underneath.
Will it fit 60.3mm tube?
Yes, with about 5mm of overhang all round. For a flush fit on 60.3mm tube, choose the 60mm hemisphere.
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.
Can I make a full ball?
Yes. Weld two together rim to rim and grind the seam, or buy the ready-made 70mm hollow sphere.
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.
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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 10 pcs