Generate a hollow cylinder or tube
A tube — a cylinder with a concentric bore. Material sits far from the neutral axis, so a tube is very efficient in bending and torsion for its weight, which is why frames and shafts are so often hollow.
Buy one ready-made
Already built, measured against its own description and priced. No need to describe it first.
What it is used for
- Structural tube and frame members
- Sleeves, liners and spacers
- Fluid and cable conduits
- Lightweight shafts
Dimensions that matter
| Outer diameter | Sets bending and torsional stiffness. |
| Inner diameter | The bore. Wall = (OD − ID) ÷ 2. |
| Length | Overall length in mm. |
What you get
A real solid model you can rotate and measure, plus downloadable STEP (machining and CAD), STL and 3MF (3D printing) and DXF (laser and waterjet) files. Optional built-in analysis covers stress (FEA), thermal, buckling, cost and manufacturability.
Before you see it, the built geometry is measured against the dimensions you stated, checked as a valid watertight solid, and — for assemblies — checked for interference. These are geometry and physics checks; they do not confirm the shape matches what you pictured, so review the 3D view or 2D drawing before relying on the part.
Previewing is free. Downloading is £2.99 per part, or unlimited on Pro (£29/month, £290/year).
Related parts
Common questions
What file formats do I get?
STEP, STL, 3MF and DXF — the formats CNC shops, laser cutters and 3D printers accept.
Can I change the dimensions afterwards?
Yes. Edit the numbers directly, or describe the change in plain English. Every edit is rebuilt and re-checked.
Do I need CAD experience?
No. Describe the part and its sizes in millimetres.
Is it free to try?
Yes — describing a part and viewing the 3D preview costs nothing.