Carbon fibre rod sizes: round 0.28 to 12 mm, square 4 to 10 mm — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/carbon-fibre-rod-sizes/  (sheet CC BY 4.0)
Basis: Maker's product listings (Easy Composites carbon fibre rod)
Catalog version: 2026-10-20

Sizes: see table below
- Solid pultruded carbon rod as listed: round 0.28 to 12 mm, square 4, 5, 6, 8 and 10 mm, and a 3 mm half round. Lengths 1000 mm, most also 2000 mm (0.28 mm and the half round 1000 mm only).
- No file: a solid rod is a plain cylinder or bar; the diameter is the design number (bore it into your part at true size and add your own fit).

section  size mm
round  0.28
round  0.5
round  0.8
round  1
round  1.2
round  1.5
round  2
round  2.5
round  3
round  4
round  5
round  6
round  8
round  10
round  12
square  4 × 4
square  5 × 5
square  6 × 6
square  8 × 8
square  10 × 10
half round  3 (diameter)

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Easy Composites: Carbon fibre rod (category: diameter in each title) — web — Publisher's page; dimensions are facts — https://www.easycomposites.co.uk/carbon-fibre-rod
- Easy Composites: Technical datasheet: carbon fibre pultrusions (tube, rod, strip, box section sizes) — web — Publisher's page; dimensions are facts — https://media.easycomposites.eu/datasheets/EC-TDS-Carbon-Fibre-Pultrusions.pdf

No true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.
API: https://xemstudio.com/api/geometry?object=carbon-fibre-rod-sizes