3.5 inch hard drive (SFF-8301) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/3-5-inch-hard-drive/  (CC BY 4.0)
Basis: SFF-8301 (SNIA SFF)
Catalog version: 2026-10-20

Overall (mm): length 147.0, width 101.6, height 26.1
- 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).

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

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- SNIA SFF: SFF-8301 3.5 in form factor — web — Publisher's page; dimensions are facts — https://members.snia.org/document/dl/25862

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/3-5-inch-hard-drive/index.json
API: https://xemstudio.com/api/geometry?object=3-5-inch-hard-drive