|
Recommended tapping and clearance drill sizes
 |
| BA British Association Thread |
| d1 |
Pitch mm |
d2 mm |
d3 mm |
|
d1 |
Pitch |
d2 mm |
d3 mm |
| No 0 |
1.00 |
5.10 |
6.10 |
|
No 9 |
0.39 |
1.55 |
1.95 |
| No 1 |
0.90 |
4.50 |
5.40 |
|
No 10 |
0.35 |
1.40 |
1.75 |
| No 2 |
0.81 |
4.00 |
4.80 |
|
No 11 |
0.31 |
1.20 |
1.60 |
| No 3 |
0.73 |
3.40 |
4.20 |
|
No 12 |
0.28 |
1.05 |
1.40 |
| No 4 |
0.66 |
3.00 |
3.70 |
|
No 13 |
0.25 |
0.98 |
1.30 |
| No 5 |
0.59 |
2.65 |
3.30 |
|
No 14 |
0.23 |
0.80 |
1.10 |
| No 6 |
0.53 |
2.30 |
2.90 |
|
No 15 |
0.21 |
0.70 |
0.98 |
| No 7 |
0.48 |
2.05 |
2.60 |
|
No 16 |
0.19 |
0.60 |
0.88 |
| No 8 |
0.43 |
1.80 |
2.25 |
|
|
|
|
|
The above information is for guidence only and should not be used when working to stringent specifications.
|
