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Metric Thread Sizes

Diameter mm Course Thread Pitch mm Fine Thread Pitch mm
M1 0.25 0.2
M1.2 0.25 0.2
M1.4 0.3  0.2
M1.6 0.35 0.2
M1.8 0.35 0.2
M2 0.4 0.25
M2.5 0.45 0.35
M3 0.5 0.35
M3.5 0.6 0.35
M4 0.7 0.5
M5 0.8 0.5
M6 1 0.75
M7 1 0.75
M8 1.25 1 or 0.75
M10 1.5 1.25 or 1
M12 1.75 1.5 or 1.25
M14 2 1.5
M16 2 1.5
M18 2.5 2 or 1.5
M20 2.5 2 or 1.5
M22 2.5 2 or 1.5
M24 3 2
M27 3 2
M30 3.5 2
M33 3.5 2
M36 4 3
M39 4 3
M42 4.5 3
M45 4.5 3
M48 5 3
M52 5 4
M56 5.5 4
M60 5.5 4
M64 6 4