# 3.5 inch hard drive (SFF-8301)

> What are the dimensions of a 3.5 inch hard drive?

- Category: Electronics › Computer storage
- Kind: Modern device
- Basis: SFF-8301 (SNIA SFF)
- Page: https://xemstudio.com/objects/3-5-inch-hard-drive/ · JSON: https://xemstudio.com/api/geometry?object=3-5-inch-hard-drive · Plain text: https://xemstudio.com/objects/3-5-inch-hard-drive/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

## Overall (mm)

| length | width | height |
|---|---|---|
| 147.0 | 101.6 | 26.1 |

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- 3.5 in drive: 101.6 mm wide, up to 147 mm long, 26.1 mm tall (1 in class; 17.8 and 42.0 also defined).
- Mounting: 6-32 UNC holes; bottom hole pair 41.28 mm and 44.45 / 76.20 mm from the reference per SFF-8301 table (dims A6, A7, A13); 95.25 mm hole spacing across.
- The file is the 101.6 × 147 × 26.1 envelope (holes not drawn: the open text does not tie each dimension to a face).

## Sizes

| dimension | value |
|---|---|
| width | 101.60 mm |
| length (max) | 147.00 mm |
| height | 26.10 mm (1 in drive) |
| thread | 6-32 UNC |

## Where the files are

- SNIA SFF: [SFF-8301 3.5 in form factor](https://members.snia.org/document/dl/25862) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, CC BY 4.0, Xem Studio)

Index: https://xemstudio.com/files/hardware/3-5-inch-hard-drive/index.json

- hdd-3-5-envelope: [STEP](https://xemstudio.com/files/hardware/3-5-inch-hard-drive/hdd-3-5-envelope.step) · [STL](https://xemstudio.com/files/hardware/3-5-inch-hard-drive/hdd-3-5-envelope.stl) — Envelope 147 × 101.6 × 26.1 mm

## Questions

**How big is a 3.5 inch hard drive?**

101.6 × 147 × 26.1 mm.

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