DRILL DIAMETERS FOR THREAD RECOMMENDATION TABLES
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CYLINDRICAL WHITWORTH PIPE THREAD
Tap G |
Number of t.p.i. |
Max Interal Diameter mm |
Drill Diameter mm |
1/8 |
28 |
8.848 |
8.8 |
1/4 |
19 |
11.89 |
11.8 |
3/8 |
19 |
15.395 |
15.25 |
1/2 |
14 |
19.172 |
19 |
5/8 |
14 |
21.128 |
21 |
3/4 |
14 |
24.658 |
24.5 |
7/8 |
14 |
28.418 |
28 |
1 |
11 |
30.931 |
30.5 |
1.1/4 |
11 |
39.592 |
39.5 |
1.1/2 |
11 |
45.485 |
45 |
1.3/4 |
11 |
51.428 |
51 |
2 |
11 |
57.296 |
57 |
2.1/4 |
11 |
63.342 |
63 |
2.1/2 |
11 |
72.866 |
72.5 |
2.3/4 |
11 |
79.216 |
79 |
3 |
11 |
85.566 |
85.5 | |