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Metric Threads

There are two kinds of ISO metric threads: coarse and fine.

The ISO metric thread profile and proportions are as follows:


Metric Thread Pitch and Tapping Sizes

Size Pitch (mm) Tapping Diameter (mm) Clearance Holes (mm)
Coarse Fine Coarse Fine Close Medium Coarse
M1.60.351.251.71.82.0
M20.41.62.22.42.6
M2.50.452.052.72.93.1
M30.52.53.23.43.6
M40.73.34.34.54.8
M50.84.25.35.55.8
M61.05.06.46.67.0
M81.251.06.87.08.49.010.0
M101.51.258.58.710.511.012.0
M121.751.2510.210.8131415
M162.01.514.014.517.018.019.0
M202.51.517.518.521.022.024.0
M243.02.021.022.025.026.028.0
M303.52.026.528.031.033.035.0
M364.03.032.033.037.039.042.0