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Pre Tap Drill Size

Inch Cutting Tap

Tap
Drill Size
Decimal Equivalent
5-44
37
0.1040
5-40
38
0.1015
4-48
42
0.0935
4-40
43
0.0890
3-56
46
0.0810
3-48
47
0.0785
2-64
50
0.0700
2-56
50
0.0700
1-72
53
0.0595
1-64
53
0.0595
0-80
3/64
0.0469
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