0.9 mm crochet hook

The short answer

A 0.9 mm hook is a US size 10, and レース針8号 in Japan. Buy by the millimetre number — it's printed on every hook and it means the same thing everywhere.

Shaft widths drawn at roughly life size. Hold your hook against the screen — the highlighted bar is 0.9 mm. Screen scaling varies by device, so treat this as a sanity check, not a measurement.

Thread lace, size 20 cotton.

The same hook in every system

Millimetres (the one that always works)	0.9 mm
US	10
UK	no UK size
Japanese 号	レース針8号 unverified
Type	lace

Systems with no exact match

0.9 mm has no direct equivalent in 1 of the three systems. These are the closest hooks, with the size difference spelled out — substitute at your own gauge risk.

System	Closest hook	Actual size	Difference
UK	14	2 mm	+1.1 mm

Yarn weights that suit this hook

No standard yarn weight lists this hook in its recommended range.

0.9 mm hooks

Aluminium, ergonomic and Japanese-style options in this size.

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Nearby sizes

1 mm 0.75 mm 0.6 mm 1.25 mm 0.5 mm

All hook sizes · US to Japanese hook chart

Last updated 2026-08-30.