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CD / DVD disc Ø120 × 1.2 mm with Ø15 hole (and mini CD Ø80)
What are the dimensions of a CD and its centre hole? · Standard part · basis: ECMA-130 / ISO 9660 physical disc: Ø120 × 1.2 mm, Ø15 mm centre hole; mini CD Ø80
Long Earth Society build part. Flywheels for the can engines; the hubs in the kit fit them to 3, 5 and 8 mm shafts. The engines
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 2 in table
Notes
- CD, DVD and Blu-ray discs share one physical size: Ø120.0 × 1.2 mm with a Ø15.0 mm centre hole (held to +0.1), about 16 g.
- The mini CD is Ø80 × 1.2 with the same Ø15 hole, about 7 g.
- Both files are flat rings drawn at those nominal sizes; the hubs in the can-engine kit are drawn with a Ø15.0 spigot for the hole (see Mating features there).
- On the can engine I use a CD as the flywheel: 16 g spread out to Ø120.
Sizes
| disc | dia_mm | thickness_mm | hole_mm | mass_g |
|---|---|---|---|---|
| CD / DVD / Blu-ray | 120 | 1.2 | 15 | 16 |
| mini CD | 80 | 1.2 | 15 | 7 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Compact disc | web | CC BY-SA 4.0 (text) |
| Wikipedia | Hard disk drive platter | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine builds (videos and write-ups) | web, video | LES site |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| cd-dvd-120 | CD / DVD / Blu-ray: Ø120 × 1.2, Ø15 hole (Ø15.0 +0.1) | STEP · STL |
| mini-cd-80 | Mini CD: Ø80 × 1.2, Ø15 hole | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=cd-dvd-discs
How it fits
Parts that fit it
CD and HDD-platter flywheel hubsØ15 / Ø25 spigot in the disc's centre holeGoes in or on
Can-engine cap for 53.3, 58, 66 and 76.2 mm cansØ15 hole on the hub's Ø15.0 spigotConnects to
Bamboo skewer Ø3 × 300 mmhub carries the disc on a Ø3 shaftAlternatives
Hard-drive plattersheavier, flatter Ø95 / Ø65 discs
Crank discs for a Ø5 shaft, 10 to 30 mm strokea drawn flywheel instead of a found discYou might also need
Questions
What is the diameter of a CD centre hole?
15.0 mm (+0.1); the disc is Ø120 × 1.2 mm.
Is a DVD the same size as a CD?
Yes: Ø120 × 1.2 mm with a Ø15 hole; Blu-ray too.
How big is a mini CD?
Ø80 × 1.2 mm with the same Ø15 centre hole.