Super Bulky yarn (CYC 6)
The short answer
This yarn is called Super Bulky in the US and Super Chunky in the UK, chougokubuto in Japan. Use a hook between 9 mm and 15 mm with it.
CYC weight 6 — Super Bulky in the US, Super Chunky in the UK, chougokubuto (超極太) in Japan. Chunky throws, floor cushions, very fast projects.
| CYC number | 6 |
|---|---|
| US | Super Bulky, Super Chunky, Roving |
| UK | Super Chunky |
| Australia | 14 ply and up |
| Japan | 超極太 (chougokubuto, "super extra thick") unverified |
| Wraps per inch | 5-6 |
| Hook range | 9–15 mm |
| Single crochet gauge | 6-9 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
Super Bulky yarn
Acrylic, cotton and wool options at this weight.
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Other weights
Last updated 2026-08-30.