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Metric

Metric Threads are measured simply by thread pitch. It is measured by finding the distance in millimeters between two crests of the threads.

Diameter Coarse Pitch Tap Drill (frac, mm) Fine Pitch Tap Drill (frac, mm) Other Fine Thread Pitches
M1.6 0.35 #55, 1.25 0.2
M2 0.4 #52, 1.6 0.25
M2.5 0.45 #46, 2.05 0.35
M3 0.5 #40, 2.5 0.35
M3.5 0.6 #33, 2.9 0.35
M4 0.7 #30, 3.3 0.5
M5 0.8 #19, 4.2 0.5
M6 1 #9, 5 0.75
M7 1 0.75
M8 1.25 H, 6.8 1 J, 7 0.75
M10 1.5 Q, 8.5 1.25 S, 8.8 1 0.75
M12 1.75 13/32, 10.3 1.25 27/64, 10.8 1.5 1
M14 2 15/32, 12 1.5 31/64, 12.5 1.25 1
M16 2 35/64, 14 1.5 0.5625, 14.5 1
M18 2.5 39/64, 15.5 1.5 21/32, 16.5 2 1
M20 2.5 11/16, 17.5 1.5 47/64, 18.5 2 1
Diameter Coarse Pitch Tap Drill (frac, mm) Fine Pitch Tap Drill (frac, mm) Other Fine Thread Pitches
M22 2.5 49/64, 19.5 1.5 13/16, 20.5 2 1
M24 3 53/64, 21 2 1.5 1
M27 3 61/64, 24 2 1.5 1
M30 3.5 1 3/64, 26.5 3 2 1.5
M33 3.5 1 5/32, 29.5 3 2 1.5
M36 4 1 17/64, 32 3 2 1.5
M42 4.5 1 15/32, 37.5 4 3 2
M48 5 1 45/64, 43 4 3 2
M52 5 1 55/64, 47 4 3 2
M56 5.5 2, 50.5 4 3 2
M60 5.5 4 3 2
M64 6 4 3 2
M68 6 4 3 2
M72 6 4 3 2
M80 6 4 3 2
M90 6 4 3 2
M100 6 4 3 2