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Metric Tap Drill Sizes
Thread Size
and
Pitch (mm)
Nominal
Drill Size
for
Inch Drills
Diameter
in
Inches
Nominal
Drill Size
for
Metric Drills (mm)
Diameter
in
Inches
M1.6 X 0.35 - - 1.25 .0492
M2 X 0.4 #52 .0635 1.60 .0630
M2.5 X 0.45 #45 .0820 2.05 .0807
M3 X 0.5 #39 .0995 2.50 .0984
M3.5 X 0.6 #32 .1160 2.90 .1142
M4 X 0.7 #30 .1285 3.30 .1299
M5 X 0.8 #19 .1660 4.20 .1654
M6 X 1 #8 .1990 5.00 .1968
M8 X 1.25 H .2660 6.80 .2677
M10 X 1.5 Q .3320 8.50 .3346
M12 X 1.75 13/32 .4062 10.25 .4035
M14 X 2 15/32 .4688 12.00 .4724
M16 X 2 35/64 .5469 14.00 .5512
M20 X 2.5 11/16 .6875 17.50 .6890
M24 X 3 53/64 .8281 21.00 .8268
M30 X 3.5 1-3/64 1.0469 26.50 1.0433
M36 X 4 1-1/4 1.2500 32.00 1.2598
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