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Pre Tap Drill Size

Inch Form Tap

Tap
Drill Size
Decimal Equivalent
3/4-16
23/32
0.7188
3/4-10
45/64
0.7031
5/8-18
15.25mm
0.6004
5/8-11
14.75mm
0.5807
9/16-18
13.50mm
0.5315
9/16-12
17/32
0.5312
1/2-20
12.25mm
0.4823
1/2-13
15/32
0.4682
7/16-20
Z
0.4130
7/16-14
Y
0.4040
3/8-24
T
0.3580
3/8-16
S
0.3480
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