|
Recommended tapping and clearance drill sizes
 |
| BSW British Standard Whitworth Thread |
| d1 Inch |
TPI |
d2 mm |
d3 mm |
|
d1 Inch |
TPI |
d2 mm |
d3 mm |
| 1/8 |
40 |
2.55 |
3.30 |
|
5/8 |
11 |
13.50 |
16.25 |
| 5/32 |
32 |
3.20 |
4.00 |
|
11/16 |
10 |
15.00 |
17.75 |
| 3/16 |
24 |
3.70 |
4.90 |
|
3/4 |
9 |
16.25 |
19.25 |
| 7/32 |
24/td>
| 4.50 |
5.70 |
|
7/8 |
8 |
19.25 |
22.50 |
| 1/4 |
20 |
5.10 |
6.50 |
|
1 |
8 |
22.00 |
25.75 |
| 5/16 |
18 |
6.50 |
8.10 |
|
1 1/8 |
7 |
24.75 |
29.00 |
| 3/8 |
16 |
7.90 |
9.70 |
|
1 1/4 |
7 |
28.00 |
32.00 |
| 7/16 |
14 |
9.30 |
11.30 |
|
1 1/2 |
6 |
33.50 |
38.50 |
| 1/2 |
12 |
10.50 |
13.00 |
|
1 3/4 |
5 |
39.00 |
45.00 |
| 9/16 |
12 |
12.10 |
14.50 |
|
2 |
4.5 |
44.50 |
51.00 |
The above information is for guidence only and should not be used when working to stringent specifications.
|
