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Description
A solid steel half ball, 50mm across with a flat back, for domed caps on 48mm tube and bold bosses on gates and panels. This hemisphere is a true half ball, 50mm across the flat base and about 25mm high, in solid forged mild steel with a lightly textured surface. Weld the flat back over the end of a 48.3mm tube for a smooth domed cap, or onto a gate, door or panel as a decorative boss. Each one weighs about 0.26 kg. The price shown is for one hemisphere, with a minimum order of 5.
Why choose this hemisphere
Caps 48.3mm tube. The 50mm base covers the end of standard 48.3mm handrail and post tube with a hair of overhang to weld round, sealing it with a solid dome.
Solid, tough and smooth. Unlike a pressed shell it will not dent, so it suits public handrails, towpath and park railings that take knocks.
A bold boss. Painted gold or black in the centre of scrollwork, it makes a strong focal point on gates, screens and panels.
Flat back, easy to fix. The flat base sits tight on a tube end, plate or strap and welds on cleanly.
Where it is used
Handrail and tube post end caps, park, towpath and play area railings, gate and screen bosses, studded doors and panels, garden furniture, and themed and period metalwork.
Specifications
| What you get | One hemisphere, minimum order 5 |
|---|---|
| Diameter | 50mm across the flat base |
| Height | About 25mm |
| Construction | Solid, flat back, no hole |
| Material | Forged mild steel |
| Finish | Raw, unpainted |
| Weight | About 0.26 kg each |
| Fixing | Weld the flat back |
Which tube or post does it suit?
| What you are capping | How the 50mm dome fits |
|---|---|
| 48.3mm round tube | Sits on the end with a slight overhang, weld all round, the best match |
| 42.4mm round tube | Overhangs about 4mm each side, weld from underneath |
| 40mm or 50mm square box | Weld a flat cap plate first, then the dome on top |
| 60.3mm tube or larger | Too small, choose a 60mm hemisphere |
Is this the right hemisphere?
| You want | Choose |
|---|---|
| A solid 50mm half ball | This hemisphere |
| A smaller, flatter solid stud | 35mm solid hemisphere |
| A light, hollow 50mm half ball | 50mm hollow hemisphere |
| A dome cap for 60.3mm tube | 60mm hollow hemisphere |
| A full 50mm ball | 50mm solid sphere |
| Every sphere and hemisphere | All spheres and hemispheres |
Fitting and care
Cut the tube square and remove the burr. Clean the tube end and the flat back to bright steel, centre the dome, tack it at four points opposite each other, then weld round and dress the weld with a flap disc for a smooth line. On a panel, mark the position with a template so bosses line up.
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 a sealed post so it galvanises safely.
Frequently asked questions
Is the price for one hemisphere?
Yes, it is for one 50mm half ball, with a minimum order of 5.
Is it solid?
Yes. It is solid steel with a flat back, about 0.26 kg, not a pressed shell.
Will it fit 48.3mm handrail tube?
Yes. The 50mm base sits on the end of 48.3mm tube with a slight overhang to weld round.
Can I weld two together to make a ball?
Yes, but the solid 50mm sphere is quicker and cheaper if you need a full ball.
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.
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