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Description
A large pressed steel half ball, 206mm across, for dome caps on piers, posts and bollards, or to weld into a full sphere. This hemisphere is pressed from mild steel sheet 2 to 3mm thick, 206mm across the open rim and about 103mm high, smooth on the outside and hollow underneath. Weld two together to make a 206mm ball, or weld one onto a cap plate as a domed top. It weighs about 1.18 kg. The price shown is for one hemisphere.
Why choose this hemisphere
Big, smooth dome. At 206mm across it caps a 150mm to 200mm pier, post or bollard with a clean, rounded top that sheds rain.
Light for its size. The pressed shell weighs about 1.18 kg, a fraction of a solid ball this size, so it is easy to lift, tack and weld in place.
Makes a full sphere. Weld two rims together, grind the seam, and you have a 206mm hollow ball for gate pier finials, garden features or sculpture.
Weldable mild steel. The 2 to 3mm wall takes a MIG weld well without burning through, and it paints or galvanises like any mild steel.
Where it is used
Gate pier and wall pier caps, bollard and post tops, large ball finials, planter and fire bowl bases, sculpture and garden art, and tank, vessel and hopper ends in fabrication work.
Specifications
| What you get | One hemisphere |
|---|---|
| Diameter | 206mm across the open rim |
| Height | About 103mm |
| Wall thickness | 2.0 to 3.0mm |
| Construction | Pressed, hollow, open underneath |
| Material | Mild steel |
| Finish | Raw, unpainted |
| Weight | About 1.18 kg |
| Fixing | Weld on |
The height is measured from the side photo and rounded, so allow a few millimetres either way.
How to use it
| Job | How to do it |
|---|---|
| Cap a round post or bollard 200mm across | Sit the rim on the post end and weld all round |
| Cap a square or smaller post | Weld a flat cap plate on the post, then weld the dome rim to the plate |
| Make a full 206mm ball | Order two, tack the rims together at four points, weld round and grind the seam |
| Cap a brick or stone pier | Weld the dome to a steel plate and fix the plate to the pier with resin anchors |
Is this the right hemisphere?
| You want | Choose |
|---|---|
| A 206mm hollow half ball | This hemisphere |
| A smaller hollow half ball | 150mm hollow hemisphere |
| A 120mm hollow half ball | 120mm hollow hemisphere |
| A ready-made hollow ball | 100mm hollow sphere |
| A heavy solid ball | 150mm solid sphere |
| Every sphere and hemisphere | All spheres and hemispheres |
Fitting and care
Clean the rim and the surface it sits on back to bright steel. Centre the dome, tack it at four points opposite each other so it does not pull to one side, then weld round in short runs. On a thin wall, keep the heat down and let each run cool. If the dome is outdoors and sealed all round, drill a small drain hole at the lowest point so condensation can escape.
Degrease, then prime with a zinc-rich or metal primer before painting. Hot-dip galvanising before powder coating gives the longest life outdoors.
Frequently asked questions
Is the price for one hemisphere?
Yes, it is for one half ball. Order two to make a full sphere.
Is it solid?
No. It is a pressed shell 2 to 3mm thick, hollow and open underneath.
Is the rim exactly round?
Pressed parts vary slightly, so the rim may be a millimetre or two out of round. Tack two halves at four points and ease them together before welding 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.
Will it fit my 200mm post?
Yes. The rim is 206mm across, so it sits over the end of a 200mm round post with a little overhang to weld to.
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.
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