Decimal
Equivalents, Standard and NPT Drill Sizes, and Sheet Metal Thickness
|
Fraction |
Decimal |
Bolt, Screw, or NPT Fitting
Size |
Tap Drill |
Tap Drill |
Number |
Letter |
Drill Size |
Sheet Metal Gauge (Steel) |
|
|
|
|
|
|
|
|
|
|
|
|
.0135 |
|
|
|
80 |
|
|
|
|
|
.0145 |
|
|
|
79 |
|
|
|
|
|
.0149 |
|
|
|
|
|
|
28 |
|
|
.0179 |
|
|
|
|
|
|
26 |
|
1/64 |
.015625 |
|
|
|
|
|
|
|
|
|
.0239 |
|
|
|
|
|
|
24 |
|
|
.0299 |
|
|
|
|
|
|
22 |
|
1/32 |
.03125 |
|
|
|
|
|
|
|
|
|
.0359 |
|
|
|
|
|
|
20 |
|
3/64 |
.0469 |
|
|
|
|
|
|
|
|
|
.0478 |
|
|
|
|
|
|
18 |
|
|
.0520 |
|
|
|
55 |
|
|
|
|
|
.0595 |
|
|
|
53 |
|
|
|
|
|
.0598 |
|
|
|
|
|
|
16 |
|
|
.0600 |
0-80 |
3/64 |
|
|
|
3/64 / 55 |
|
|
1/16 |
.0625 |
1/16-60 |
3/64 |
.0469 |
|
|
|
|
|
|
.0700 |
|
|
|
50 |
|
|
|
|
|
.730 |
|
|
|
49 |
|
|
|
|
|
.0730 |
|
1-64 |
.0595 |
|
|
53 / 1/16 |
|
|
|
.0730 |
|
1-72 |
.0595 |
|
|
53 / 52 |
|
|
|
.0747 |
|
|
|
|
|
|
14 |
|
|
.0760 |
|
|
|
48 |
|
|
|
|
1/16-27 NPT |
|
1/16-27 NPT |
|
.242 |
|
C |
|
|
|
5/64 |
.078125 |
|
|
|
|
|
|
|
|
|
.0785 |
|
|
|
47 |
|
|
|
|
|
.0810 |
|
|
|
46 |
|
|
|
|
|
.0820 |
|
|
|
45 |