Drill Sizes for Metric Taps

The table below shows the drill hole sizes for standard metric (coarse) threads and metric fine threads.

Metric & Metric Fine Tap Drill Chart

Ø Metric Metric Fine
Pitch Drill Size Pitch Drill Size
mm in mm in
M1.6 0.35 1.25 3/64
M1.8 0.35 1.45 0.059 (#53)
M2 0.4 1.6 0.063 (#52)
M2.2 0.45 1.75 0.070 (#50)
M2.5 0.45 2.05 0.081 (#46)
M3 0.5 2.5 0.099 (#39)
M3.5 0.6 2.9 0.116 (#32)
M4 0.7 3.3 0.128 (#30)
M4.5 0.75 3.7 0.147 (#26)
M5 0.8 4.2 0.166 (#19)
M6 1 5 0.199 (#8)
M7 1 6 0.238 (B)
M8 1.25 6.8 0.266 (H) 1 7 0.277 (J)
M10 1.5 8.5 0.339 (R) 1.25 8.8 11/32
M12 1.75 10.2 0.404 (Y) 1.5 10.5 0.413 (Z)
M14 2 12 15/32 1.5 12.5 1/2
M16 2 14 9/16 1.5 14.5 37/64
M18 2.5 15.5 39/64 1.5 16.5 21/32
M20 2.5 17.5 11/16 1.5 18.5 47/64
M22 2.5 19.5 49/64 1.5 20.5 13/16
M24 3 21 53/64 2 22 7/8
M27 3 24 61/64 2 25 63/64
M30 3.5 26.5 1-3/64 2 28 1-7/64
M33 3.5 29.5 1-11/64 2 31 1-7/32
M36 4 32 1-17/64 3 33 1-19/64
M39 4 35 1-25/64 3 36 1-27/64

 

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