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The Web's best Machine Design Guide for Mechanical Engineers and Designers
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| Reference data you can use, an NPT tap drill chart, in inches. |
TAP DRILL SIZE CHART FOR NPT THREADS
(National Pipe Threads) |
|
NPT Size
|
Tap Drill
Size (in.)
|
(Decimal) (in.)
|
| 1/16 - 27 |
"C" |
(0.242) |
| 1/8 - 27 |
"Q" |
(0.332) |
| 1/4 - 18 |
7/16 |
(0.438) |
| 3/8 - 18 |
9/16 |
(0.562) |
| 1/2 - 14 |
45/64 |
(0.703) |
| 3/4 - 14 |
29/32 |
(0.906) |
| 1.0 - 11-1/2 |
1-9/64 |
(1.141) |
| 1-1/4 - 11-1/2 |
1-31/64 |
(1.484) |
| 1-1/2 - 11-1/2 |
1-23/32 |
(1.719) |
| 2.0 - 11-1/2 |
2-3/16 |
(2.188) |
| 2-1/2 - 8 |
2-39/64 |
(2.609) |
| 3.0 - 8 |
3-15/64 |
(3.234) |
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