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Description
A small pressed steel half ball, 60mm across, the neat domed cap for 60.3mm round tube posts and handrail ends. This hemisphere is pressed from mild steel sheet 2 to 3mm thick, 60mm across the open rim and about 30mm high, smooth on the outside and hollow underneath. Weld it over the open end of a round tube to seal it with a rounded dome, or weld two together to make a 60mm hollow ball. It weighs about 0.08 kg. The price shown is for one hemisphere, with a minimum order of 10.
Why choose this hemisphere
Made for 60.3mm tube. The 60mm rim matches the outside of standard 60.3mm round steel tube, so the dome sits flush on the cut end with a clean weld line.
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 has no sharp edges for hands, clothing or passing children.
Light and quick to fit. At about 80 grams it is easy to hold in place and tack, and the 2 to 3mm wall welds without burning through.
Where it is used
Round tube fence and railing posts, pedestrian guard rails, handrail and barrier posts, bollards and play equipment, gate frame uprights, and small ball finials made from two halves.
Specifications
| What you get | One hemisphere, minimum order 10 |
|---|---|
| Diameter | 60mm across the open rim |
| Height | About 30mm |
| Wall thickness | 2.0 to 3.0mm |
| Construction | Pressed, hollow, open underneath |
| Material | Mild steel |
| Finish | Raw, unpainted |
| Weight | About 0.08 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 60mm dome fits |
|---|---|
| 60.3mm round tube | Sits flush on the end, weld all round, the best match |
| 48.3mm round tube | Overhangs about 6mm each side, weld from underneath, or choose a 50mm dome |
| 50mm or 60mm square box | Weld a flat cap plate first, then the dome on top |
| 76mm tube or larger | Too small, choose a 70mm or 80mm dome |
Is this the right hemisphere?
| You want | Choose |
|---|---|
| A 60mm hollow half ball | This hemisphere |
| A smaller hollow half ball | 50mm hollow hemisphere |
| A larger hollow half ball | 70mm hollow hemisphere |
| An 80mm hollow half ball | 80mm hollow hemisphere |
| A solid 60mm ball | 60mm 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. The rim is 60mm across, so it sits on the end of a 60.3mm tube and welds round flush.
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 for a 60mm hollow ball.
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