8 in floppy disk (200 mm) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/8-inch-floppy-disk-200-mm/  (CC BY 4.0)
Basis: ECMA-69, 200 mm flexible disk cartridge, double-density two-sided
Catalog version: 2026-10-20

Overall (mm): length 203.2, width 203.2, height 2.1
- An 8 inch floppy disk jacket is a 203.2 mm square (l1 = 203.2 ±0.4 mm, corners 90° ±30′) and between 1.2 and 2.1 mm thick overall (ECMA-69 §3.1). The central window is Ø58.40 ±0.15 mm, centred 101.6 mm from the reference edge — the middle of the jacket.
- The file is the jacket at the published size: 203.2 × 203.2 mm, drawn 2.1 mm thick (the standard's maximum overall thickness), with the Ø58.4 mm central window at the jacket centre; no printing allowance. Index and head windows are listed above but not modelled. 

dimension  value
jacket side (l1)  203.2 mm ±0.4
corner angle  90° ±30′
overall thickness (e2)  over 1.2 mm, under 2.1 mm
gauge  falls freely through a 2.6 mm slot, 150 mm deep
central window (d1)  Ø58.4 mm
central window centre (l2)  101.6 mm ±0.3 from the reference edge
index window (d2)  Ø7.7 mm ±0.1 at l3 85.09 / l4 135.95 mm ±0.25
jacket wall and liner (e1)  0.45 mm ±0.15

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Ecma International: ECMA-69 (PDF) — web — Publisher's page; dimensions are facts — https://ecma-international.org/wp-content/uploads/ECMA-69_1st_edition_january_1981.pdf

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/8-inch-floppy-disk-200-mm/index.json
API: https://xemstudio.com/api/geometry?object=8-inch-floppy-disk-200-mm