US G-6 Crochet Hook: Metric Size

A G-6 hook comes in at 4.0mm — comfortably inside sport weight's recommended hook range (E-4 to 7) and, depending on your tension, a workable choice for a firmer DK-weight fabric as well.

Where G-6 gets used

Sport-weight garments, lightweight accessories, and a very common choice for standard-scale amigurumi worked in worsted or DK yarn, where the size-down-from-yarn-weight trick produces the tight, stuffing-proof fabric the craft depends on. It's also a frequent teaching hook, large enough to see stitch mechanics clearly without being unwieldy the way the biggest hooks can feel to a first-time crocheter.

The oddity right next to it

One step up from G-6 sits a hook labeled simply "7" (4.5mm) — the single hook size in the standard US system named with a plain number rather than a letter-and-number combination, a naming quirk inherited from the system's own history rather than a typo or inconsistency.

Gauge implications

At single crochet's sport-weight range (16-20 stitches per 4 inches), G-6 typically sits mid-range. For amigurumi purposes on worsted-weight yarn, the same hook produces meaningfully tighter fabric than worsted's own chart predicts — again, the entire point of the size-down convention rather than a mismatch to fix.

FAQ

Why is one hook size just labeled "7" instead of a letter? It's a longstanding quirk of the US hook naming convention rather than a design choice with a clear rationale — the letter-and-number pattern simply has one gap at this specific size, filled by a bare number instead.

Is G-6 a good default hook for a beginner's first project? Yes — it's large enough to see stitch structure clearly, works well with widely available worsted or DK-weight yarn (sized down slightly), and produces a forgiving, easy-to-correct fabric while learning.

What's the closest knitting needle size to G-6 in diameter? A US 6 knitting needle (4.0mm) matches exactly, sharing the same number by coincidence — as with several other sizes in the middle of both ranges.

Does G-6 come in ergonomic handle versions, not just plain aluminum? Yes — G-6 is common enough that most ergonomic-handle hook lines include it, alongside the plainer inline and tapered styles that don't add a molded grip.