top of page

Pre Tap Drill Size

Inch Form Tap

Tap
Drill Size
Decimal Equivalent
5-44
2.90mm
0.1142
5-40
33
0.1130
4-48
2.60
0.1023
4-40
38
0.1015
3-56
2.30mm
0.0905
3-48
43
0.0890
2-64
47
0.0785
2-56
5/64
0.0781
1-72
51
0.0670
1-64
51
0.0670
0-80
54
0.0550
bottom of page