Medium yarn (CYC 4)
The short answer
This yarn is called Medium in the US and Aran in the UK, namibuto in Japan. Use a hook between 5.5 mm and 6.5 mm with it.
CYC weight 4 — Medium in the US, Aran in the UK, namibuto (並太) in Japan. Blankets, hats, the default beginner yarn in the US.
| CYC number | 4 |
|---|---|
| US | Medium, Worsted, Afghan, Aran |
| UK | Aran, 10 ply |
| Australia | 10 ply |
| Japan | 並太 (namibuto, "standard thick") unverified |
| Wraps per inch | 9-12 |
| Hook range | 5.5–6.5 mm |
| Single crochet gauge | 11-14 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
Medium yarn
Acrylic, cotton and wool options at this weight.
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Other weights
Last updated 2026-08-30.