Below are a list of spanner sizes to fit standard metric nuts

Nut Size

Spanner Size

M3 5.5 mm
M4 7 mm
M5 8 mm
M6 10 mm
M8 13 mm
M10 17 mm
M12 19 mm
M14 22 mm
M16 24 mm
M18 27 mm
M20 30 mm
M24 36 mm
M30 46 mm
M36 55 mm

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