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Description
A pressed steel half ball, 150mm across, for domed caps on round posts and columns, or to weld into a full sphere. This hemisphere is pressed from mild steel sheet 2 to 3mm thick, 150mm across the open rim and about 75mm high, smooth on the outside and hollow underneath. Weld it on as a domed cap, or weld two together to make a 150mm ball. It weighs about 0.66 kg. The price shown is for one hemisphere, with a minimum order of 5.
Why choose this hemisphere
Caps a round post neatly. The 150mm rim sits on a 139mm or 150mm round post or column with a small overhang to weld to, giving a smooth dome that sheds rain.
Light and easy to handle. At about 0.66 kg the shell is easy to hold in place, tack and weld, even on a tall post.
Makes a full sphere. Weld two rims together and grind the seam for a 150mm hollow ball, far lighter than solid.
Weldable mild steel. The 2 to 3mm wall takes a MIG weld without burning through and paints or galvanises like any mild steel.
Where it is used
Gate post and column caps, pergola and canopy column tops, bollard tops, large ball finials, planter and fire bowl bases, sculpture and garden art, and vessel ends in fabrication work.
Specifications
| What you get | One hemisphere, minimum order 5 |
|---|---|
| Diameter | 150mm across the open rim |
| Height | About 75mm |
| Wall thickness | 2.0 to 3.0mm |
| Construction | Pressed, hollow, open underneath |
| Material | Mild steel |
| Finish | Raw, unpainted |
| Weight | About 0.66 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 139mm or 150mm round post | 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 150mm ball | Use two, tack the rims together at four points, weld round and grind the seam |
| Make a dome on a wall or panel | Weld the rim to a flat plate and fix the plate in place |
Is this the right hemisphere?
| You want | Choose |
|---|---|
| A 150mm hollow half ball | This hemisphere |
| A larger hollow half ball | 206mm hollow hemisphere |
| A smaller hollow half ball | 120mm hollow hemisphere |
| A 100mm hollow half ball | 100mm hollow hemisphere |
| A heavy solid 150mm 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, keeping the heat down on the thin wall. 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, 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.
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 round post?
It suits round posts and columns from about 139mm to 150mm across. For smaller posts, weld a cap plate on first.
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