BA screw sizes
by Russ Elliott
|
BA
no. |
tpi
(threads
per inch) |
Tapping
drill size
(mm) |
Clearance
drill size
(mm) |
| 0 |
25.40 |
5.2 |
6.1 |
| 1 |
28.22 |
4.5 |
5.4 |
| 2 |
31.35 |
4.1 |
4.8 |
| 3 |
34.79 |
3.5 |
4.2 |
| 4 |
38.48 |
3.0 |
3.7 |
| 5 |
43.05 |
2.65 |
3.3 |
| 6 |
47.92 |
2.3 |
2.85 |
| 7 |
52.91 |
2.1 |
2.55 |
| 8 |
59.07 |
1.8 |
2.3 |
| 9 |
65.12 |
1.6 |
1.95 |
| 10 |
72.57 |
1.4 |
1.75 |
| 11 |
81.93 |
1.2 |
1.5 |
| 12 |
90.71 |
1.05 |
1.3 |
| 13 |
101.60 |
0.975 |
1.15 |
| 14 |
110.43 |
0.80 |
1.00 |
| 15 |
120.95 |
0.70 |
0.90 |
| 16 |
133.68 |
0.60 |
0.80 |
|
