DRILL DIAMETERS FOR THREAD RECOMMENDATION TABLES
TAPERED AMERICAN PIPE -DRYSEAL-
Tap NPTF |
Number of t.p.i. |
Drill Diameter mm |
Ex1 |
1/8 |
27 |
8.4 |
0 |
1/4 |
18 |
10.9 |
0 |
3/8 |
18 |
14.25 |
0 |
1/3 |
14 |
17.75 |
0 |
3/4 |
14 |
23 |
0 |
1 |
11.1/2 |
29 |
0 |
1.1/4 |
11.1/2 |
37.75 |
0 |
1.1/2 |
11.1/2 |
43.75 |
0 |
2 |
11.1/2 |
55.75 |
0 |
2.1/2 |
8 |
66.5 |
0 |
3 |
8 |
82.5 |
0 | |