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Hard-drive platters: 3.5 in Ø95 × 1.27 mm (Ø25 hole), 2.5 in Ø65 × 0.8 mm (Ø20 hole)
What are hard drive platter dimensions? · Standard part · basis: 3.5 in (95 mm) and 2.5 in (65 mm) hard-drive form-factor platters
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
- A 3.5 in drive platter is Ø95 × 1.27 mm (some 0.8–1.0) with a Ø25 mm centre hole, about 30 g.
- A 2.5 in drive platter is Ø65 × 0.8 mm with a Ø20 mm centre hole, about 7 g.
- Platters are flat and balanced; three 3.5 in platters stacked are about 90 g at Ø95.
- The hubs in the can-engine kit take a 3.5 in platter's Ø25 hole onto a 5 or 8 mm shaft (spigot drawn at Ø25.0).
Sizes
| platter | dia_mm | thickness_mm | hole_mm | mass_g |
|---|---|---|---|---|
| 3.5 in | 95 | 1.27 | 25 | 30 |
| 2.5 in | 65 | 0.8 | 20 | 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
| hdd-platter-3-5in | 3.5 in hard-drive platter: Ø95 × 1.27, Ø25 hole (aluminium or glass) | STEP · STL |
| hdd-platter-2-5in | 2.5 in platter: Ø65 × 0.8, Ø20 hole | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=hdd-platters
How it fits
Goes in or on
Can-engine cap for 53.3, 58, 66 and 76.2 mm cansØ25 hole on the hub's Ø25.0 spigotAlternatives
CD / DVD disc Ø120 × 1.2 mm with Ø15 holelighter Ø120 disc
Crank discs for a Ø5 shaft, 10 to 30 mm strokea drawn flywheelYou might also need
Questions
What are 3.5 inch hard drive platter dimensions?
Ø95 mm, Ø25 mm hole, about 1.27 mm thick (0.8–1.0 in some drives).
What is a 2.5 inch platter's size?
Ø65 × 0.8 mm with a Ø20 mm hole.
Are all 3.5 in platters the same thickness?
No; 1.27 mm is common, some drives use 0.8–1.0 mm platters with the same Ø95 / Ø25 size.