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Pre Tap Drill Size

Metric Form Tap

Tap
Drill Size
Decimal Equivalent
M18 x 1.50
17.25MM
0.6791
M18 x 2.50
39/64
0.6094
M16 x 1.50
15.25MM
0.6004
M16 x 2.00
19/32
0.5938
M14 x 2.00
33/64
0.5156
M12 x 1.25
11.50MM
0.4528
M12 x 1.75
11.20MM
0.4409
M10 x 1.25
9.40 MM
0.3701
M10 x 1.50
U
0.3680
M8 x 1.00
19/64
0.2969
M8 x 1.25
7.40MM
0.2913
M7 x 1.00
F
0.2570
Inch Cutting Tap
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