Bulky yarn (CYC 5)
The short answer
This yarn is called Bulky in the US and Chunky in the UK, gokubuto in Japan. Use a hook between 6.5 mm and 9 mm with it.
CYC weight 5 — Bulky in the US, Chunky in the UK, gokubuto (極太) in Japan. Fast blankets, winter accessories, baskets.
| CYC number | 5 |
|---|---|
| US | Bulky, Chunky, Craft, Rug |
| UK | Chunky, 12 ply |
| Australia | 12 ply |
| Japan | 極太 (gokubuto, "extra thick") unverified |
| Wraps per inch | 6-9 |
| Hook range | 6.5–9 mm |
| Single crochet gauge | 8-11 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
Bulky yarn
Acrylic, cotton and wool options at this weight.
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Other weights
Last updated 2026-08-30.