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I.S.O. Metric Special
Thread Form
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- p = Pitch
- hn = Height of internal thread = 0.54127p
- hs = Height of external thread = 0.61344p
- r = Basic Radius = 0.1443p
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Thread Tables
| Nominal Diameter |
Pitch |
Basic Major Diameter |
Basic Effective Diameter |
Basic Minor Diameter of External Threads |
Basic Minor Diameter of Internal Threads |
Tapping Drill |
Clearance Drill |
| (mm) |
(mm) |
(mm) |
(mm) |
(mm) |
(mm) |
(mm) |
(mm) |
| 1.7 |
0.35 |
1.7 |
1.473 |
1.27 |
1.321 |
1.35 |
1.8 |
| 2 |
0.45 |
2 |
1.708 |
1.448 |
1.513 |
1.55 |
2.1 |
| 2.3 |
0.4 |
2.3 |
2.04 |
1.809 |
1.867 |
1.9 |
2.4 |
| 2.6 |
0.45 |
2.6 |
2.308 |
2.048 |
2.113 |
2.15 |
2.7 |
| 3 |
0.6 |
3 |
2.61 |
2.264 |
2.35 |
2.4 |
3.1 |
| 4 |
0.75 |
4 |
3.513 |
3.08 |
3.188 |
3.2 |
4.1 |
| 5 |
0.9 |
5 |
4.415 |
3.896 |
4.026 |
4.1 |
5.1 |
| 5.5 |
0.9 |
5.5 |
4.915 |
4.396 |
4.526 |
4.6 |
5.6 |
| 8 |
0.75 |
8 |
7.513 |
7080 |
7.188 |
7.2 |
8.2 |
| 9 |
1 |
9 |
8.35 |
7.773 |
7.917 |
8 |
9.2 |
| 10 |
0.75 |
10 |
9.513 |
9.08 |
9.188 |
9.2 |
10.2 |
| 10 |
1 |
10 |
9.35 |
8.773 |
8.917 |
9 |
10.2 |
| 12 |
1 |
12 |
11.35 |
10.773 |
10.917 |
11 |
12.2 |
| 12 |
1.5 |
12 |
11.026 |
10.16 |
10.376 |
10.5 |
12.2 |
| 14 |
1.25 |
14 |
13.188 |
12.466 |
12.647 |
12.8 |
14.25 |
| 16 |
1 |
16 |
15.35 |
14.773 |
14.917 |
15 |
16.25 |
| 20 |
1 |
20 |
19.35 |
18.773 |
18.917 |
19 |
20.25 |
| 20 |
2 |
20 |
10.701 |
17.546 |
17.835 |
18 |
20.25 |
| 24 |
1 |
24 |
23.35 |
22.773 |
22.917 |
23 |
24.25 |
| 24 |
1.5 |
24 |
23.026 |
22.16 |
22.376 |
22.5 |
24.25 |
| 25 |
1.5 |
25 |
24.026 |
23.16 |
23.376 |
23.5 |
25.25 |
| 32 |
1.5 |
32 |
31.026 |
30.16 |
30.376 |
30.5 |
32.6 |
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