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I.S.O. Metric Fine
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) |
| 3 |
0.35 |
3 |
2.773 |
2.57 |
2.621 |
2.65 |
3.1 |
| 4 |
0.5 |
4 |
3.675 |
3.387 |
3.459 |
3.5 |
4.1 |
| 5 |
0.5 |
5 |
4.675 |
4.387 |
4.459 |
4.5 |
5.1 |
| 6 |
0.75 |
6 |
5.513 |
5.08 |
5.188 |
5.2 |
6.1 |
| 7 |
0.75 |
7 |
6.513 |
6.08 |
6.188 |
6.2 |
7.2 |
| 8 |
1 |
8 |
7.35 |
6.773 |
8.917 |
7 |
8.2 |
| 10 |
1.25 |
10 |
9.188 |
8.466 |
8.647 |
8.8 |
10.2 |
| 12 |
1.25 |
12 |
11.188 |
10.466 |
10.647 |
10.8 |
12.2 |
| 14 |
1.5 |
14 |
13.026 |
12.16 |
12.376 |
12.5 |
14.25 |
| 16 |
1.5 |
16 |
15.026 |
14.16 |
14.376 |
14.5 |
16.25 |
| 18 |
1.5 |
18 |
17.026 |
16.16 |
16.376 |
16.5 |
18.25 |
| 20 |
1.5 |
20 |
19.026 |
18.16 |
18.376 |
18.5 |
20.25 |
| 22 |
1.5 |
22 |
21.026 |
20.16 |
20.376 |
20.5 |
22.25 |
| 24 |
2 |
24 |
22.701 |
21.546 |
21.835 |
22 |
24.25 |
| 27 |
2 |
27 |
25.701 |
24.506 |
24.835 |
25 |
27.25 |
| 30 |
2 |
30 |
28.701 |
27.546 |
27.885 |
28 |
30.5 |
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