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A symmetrical V thread with an angle between the threads measured in the axial plane of 55°. 1/6 of the V, i.e. the point is truncated with arcs blended tangentially into the flanks. The following table lists tapping and clearance drill sizes in imperial and metric.
|
|
|
Tapping Drill |
Clearance Drill |
||
|
Dia. in |
TPI |
inches |
mm |
inches |
mm |
|
1/16 |
60 |
0.0413 |
1.05 |
|
|
|
3/32 |
48 |
0.077 |
1.95 |
|
|
|
1/8 |
40 |
0.104 |
2.65 |
9/64 |
3.57 |
|
5/32 |
32 |
0.13 |
3.3 |
|
|
|
3/16 |
24 |
0.154 |
3.9 |
13/64 |
5.16 |
|
7/32 |
24 |
0.185 |
4.7 |
|
|
|
1/4 |
20 |
0.209 |
5.3 |
17/64 |
6.75 |
|
5/16 |
18 |
0.264 |
6.7 |
21/64 |
8.3 |
|
3/8 |
16 |
0.323 |
8.2 |
25/64 |
9.9 |
|
7/16 |
14 |
0.374 |
9.5 |
29/64 |
11.5 |
|
1/2 |
12 |
13/32 |
10.7 |
33/64 |
13.1 |
|
9/16 |
12 |
15/32 |
12.4 |
37/64 |
14.7 |
|
5/8 |
11 |
33/64 |
13.8 |
41/64 |
16.3 |
|
3/4 |
10 |
5/8 |
16.75 |
49/64 |
19.5 |
|
7/8 |
9 |
47/64 |
19.5 |
57/64 |
22.6 |
|
1 |
8 |
27/32 |
22.5 |
11/64 |
25.8 |
|
11/8 |
7 |
61/64 |
24.2 |
19/64 |
29.0 |
|
11/4 |
7 |
15/64 |
27.4 |
117/64 |
32.2 |
|
11/2 |
6 |
119/64 |
32.9 |
133/64 |
38.5 |
|
2 |
41/2 |
147/64 |
44.1 |
21/64 |
51.2 |
See also: British Association Threads.