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Description
A small pressed steel half ball, 50mm across, the light domed cap for 48.3mm handrail and post tube. This hemisphere is pressed from mild steel sheet 2 to 3mm thick, 50mm across the open rim and about 25mm high, smooth on the outside and hollow underneath. Weld it over the open end of a 48.3mm tube to seal it with a rounded dome, or weld two together to make a 50mm hollow ball. It weighs about 0.06 kg. The price shown is for one hemisphere, with a minimum order of 10.
Why choose this hemisphere
Made for 48.3mm tube. The 50mm rim sits on the end of standard 48.3mm handrail and scaffold-size tube with a hair of overhang to weld round.
Seals the post. A welded dome keeps rain out of handrail posts and uprights, so they do not fill with water and rust from the inside.
Rounded and safe. A smooth dome removes sharp tube ends on ramps, steps, play and fitness equipment.
The light option. At about 60 grams it is a fraction of the weight and price of a solid dome, ideal when you are capping a long run of posts.
Where it is used
Handrail and balustrade posts on ramps and steps, outdoor fitness and play equipment, barrier and guard rail posts, fence and gate frame uprights, and small ball finials made from two halves.
Specifications
| What you get | One hemisphere, minimum order 10 |
|---|---|
| Diameter | 50mm across the open rim |
| Height | About 25mm |
| Wall thickness | 2.0 to 3.0mm |
| Construction | Pressed, hollow, open underneath |
| Material | Mild steel |
| Finish | Raw, unpainted |
| Weight | About 0.06 kg |
| Fixing | Weld on |
The height is measured from the side photo and rounded, so allow a millimetre either way.
Which tube does it suit?
| Tube or post 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 light, hollow 50mm half ball | This hemisphere |
| A solid 50mm half ball | 50mm solid hemisphere |
| A cap for 60.3mm tube | 60mm hollow hemisphere |
| A ready-made 50mm hollow ball | 50mm hollow sphere |
| A small flat-backed stud | 35mm solid hemisphere |
| 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. A solid 50mm hemisphere is also available.
Will it fit 48.3mm handrail tube?
Yes. The rim is 50mm across, so it sits on the end of 48.3mm tube and welds 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.
Can I make a full ball?
Yes. Weld two together rim to rim and grind the seam, or buy the ready-made 50mm 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