Fine yarn (CYC 2)
The short answer
This yarn is called Fine in the US and 5 ply in the UK, chuuboso in Japan. Use a hook between 3.5 mm and 4.5 mm with it.
CYC weight 2 — Fine in the US, 5 ply in the UK, chuuboso (中細) in Japan. Baby garments, lightweight tops, detailed amigurumi.
| CYC number | 2 |
|---|---|
| US | Fine, Sport, Baby |
| UK | 5 ply |
| Australia | 5 ply |
| Japan | 中細 (chuuboso, "medium-fine") unverified |
| Wraps per inch | 12-18 |
| Hook range | 3.5–4.5 mm |
| Single crochet gauge | 16-20 sts / 4 in |
On Japanese yarn
Japanese yarn is normally sold by ball weight with a stated metres-per-gram rather than by a
weight category. The names above are conventional descriptions, not a standard. When substituting,
match metres per gram, not the category name.
Hooks for this weight
Fine yarn
Acrylic, cotton and wool options at this weight.
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Other weights
Last updated 2026-08-30.