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Machinist Tap - Drill Chart for ANSI Size Threads
Machinist Metric ISO Screw Thread Tap - Drill Size Chart ANSI Standard Pipe Thread Recommended Tap size and Drilled Pilot Hole.
| TAPER PIPE SIZES - NPT |
| TAP SIZE |
DRILL SIZE |
| 1/8-27 |
R |
| 1/4-18 |
7/16 |
| 3/8-18 |
37/64 |
| 1/2-14 |
23/32 |
| 3/4-14 |
59/64 |
| 1"-11-1/2 |
1-5/32 |
| 1-1/4-11-1/2 |
1-1/2 |
| 1-1/2-11-1/2 |
1-47/64 |
| 2"-11-1/2 |
2-7/32 |
| 2-1/2-8 |
2-5/8 |
| 3"-8 |
3-1/4 |
| 3-1/2-8 |
3-3/4 |
| 4"-8 |
4-1/4 |
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| STRAIGHT PIPE SIZES - NPS |
| TAP SIZE |
DRILL SIZE |
| 1/8-27 |
S |
| 1/4-18 |
29/64 |
| 3/8-18 |
19/32 |
| 1/2-14 |
47/64 |
| 3/4-14 |
15/16 |
| 1"-11-1/2 |
1-3/16 |
| 1-1/4-11-1/2 |
1-33/64 |
| 1-1/2-11-1/2 |
1-3/4 |
| 2"-11-1/2 |
2-7/32 |
| 2-1/2-8 |
2-21/32 |
| 3"-8 |
3-9/32 |
| 3-1/2-8 |
3-25/32 |
| 4"-8 |
4-9/32 |
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