Parts and alternatives that might help you mount a ~30 cm or ~40 cm aluminium ring for a waveguide on AliExpress.

Some parts and alternatives that might help mount a ~30 cm or ~40 cm aluminium ring for waveguides — including raw material you can machine or tube rings / mounting rings that are closer to what you need:

🔩 Raw Material / Flat Ring Stock

• – Aluminium round plate in various diameters (including ~300–400 mm), which you could machine into a structural ring for mounting your waveguide if you have access to tools. This gives you a solid start rather than trying to find a pre-made ring on AliExpress.

📏 Larger Dia. or Custom Rings (for Telescope / DIY)

• – CNC-machined ring that might be repurposed for a larger mounting use.
• – Tube rings in larger sizes; not quite 300–400 mm but gives an idea of available parts.
• – Example of a paired ring setup designed to mount a larger tube; could be adapted.
• , , , – A range of metal tube rings that might be useful if you can mount your waveguide inside or around an existing scope tube.

🧠 Tips to find exact size aluminium rings on AliExpress

AliExpress often returns unrelated items if the keywords don’t match how sellers label things. Try:

Better search keywords

• aluminium round plate 300mm
• aluminium ring blank 400mm
• 6061 aluminum circle sheet 300mm
• metal ring 300mm outer diameter

Use filters

• Sort by Orders and filter to “Metal fabrication / Materials” or Industrial Supplies if the platform allows.

Use Google site search

site:aliexpress.com aluminium 400mm circle plate

Often the exact stock like a flat aluminium circle shows up better via Google than AliExpress’s internal search.

Alternative if you cannot find pre-made rings

You can buy a flat aluminium round plate and:

• Machine a central hole and inner cut-out yourself
• Drill mounting holes
• Use as a custom mount for your waveguide

This is often easier and cheaper than hunting for a ready-made telescope-sized ring that fits precisely.