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ISO Hardware Engineering Data | Hardware Supplier and Manufacturers
Fastener and Screw / Bolt Design, Formula and Calculations
ANSI Screw and Nut Threads Size Chart
The following are standard metric external thread size per. ANSI/ASME B1.13M-1995. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Do not use these values for standard metric internal thread design. All units in mm.
|
Basic Fastener (External) Thread |
Tolerance |
Major Diameter |
|
|
|
Designation |
Class |
Max |
Min |
Max |
Min |
Max. |
Min. |
M1.6 × 0.35 |
6g |
1.581 |
1.496 |
1.354 |
1.291 |
1.202 |
1.075 |
M1.6 × 0.35 |
4g6g |
1.581 |
1.496 |
1.354 |
1.314 |
1.202 |
1.098 |
M2 × 0.4 |
6g |
1.981 |
1.886 |
1.721 |
1.654 |
1.548 |
1.408 |
M2 × 0.4 |
4g6g |
1.981 |
1.886 |
1.721 |
1.679 |
1.548 |
1.433 |
M2.5 × 0.45 |
6g |
2.480 |
2.380 |
2.188 |
2.117 |
1.993 |
1.840 |
M2.5 × 0.45 |
4g6g |
2.480 |
2.380 |
2.188 |
2.143 |
1.993 |
1.866 |
M3 × 0.5 |
6g |
2.980 |
2.874 |
2.655 |
2.580 |
2.439 |
2.272 |
M3 × 0.5 |
4g6g |
2.980 |
2.874 |
2.655 |
2.607 |
2.439 |
2.299 |
M3.5 × 0.6 |
6g |
3.479 |
3.354 |
3.089 |
3.004 |
2.829 |
2.635 |
M3.5 × 0.6 |
4g6g |
3.479 |
3.354 |
3.089 |
3.036 |
2.829 |
2.667 |
M4 × 0.7 |
6g |
3.978 |
3.838 |
3.523 |
3.433 |
3.220 |
3.002 |
M4 × 0.7 |
4g6g |
3.978 |
3.838 |
3.523 |
3.467 |
3.220 |
3.036 |
M5 × 0.8 |
6g |
4.976 |
4.826 |
4.456 |
4.361 |
4.110 |
3.869 |
M5 × 0.8 |
4g6g |
4.976 |
4.826 |
4.456 |
4.396 |
4.110 |
3.904 |
M6 × 1 |
6g |
5.974 |
5.794 |
5.324 |
5.212 |
4.891 |
4.596 |
M6 × 1 |
4g6g |
5.974 |
5.794 |
5.324 |
5.253 |
4.891 |
4.637 |
M8 × 1.25 |
6g |
7.972 |
7.760 |
7.160 |
7.042 |
6.619 |
6.272 |
M8 × 1.25 |
4g6g |
7.972 |
7.760 |
7.160 |
7.085 |
6.619 |
6.315 |
M8 × 1 |
6g |
7.974 |
7.794 |
7.324 |
7.212 |
6.891 |
6.596 |
M8 × 1 |
4g6g |
7.974 |
7.794 |
7.324 |
7.253 |
6.891 |
6.637 |
M10 × 1.5 |
6g |
9.968 |
9.732 |
8.994 |
8.862 |
8.344 |
7.938 |
M10 × 1.5 |
4g6g |
9.968 |
9.732 |
8.994 |
8.909 |
8.344 |
7.985 |
M10 × 1.25 |
6g |
9.972 |
9.760 |
9.160 |
9.042 |
8.619 |
8.272 |
M10 × 1.25 |
4g6g |
9.972 |
9.760 |
9.160 |
9.085 |
8.619 |
8.315 |
M10 × 0.75 |
6g |
9.978 |
9.838 |
9.491 |
9.391 |
9.166 |
8.929 |
M10 × 0.75 |
4g6g |
9.978 |
9.838 |
9.491 |
9.428 |
9.166 |
8.966 |
M12 × 1.75 |
6g |
11.966 |
11.701 |
10.829 |
10.679 |
10.072 |
9.601 |
M12 × 1.75 |
4g6g |
11.966 |
11.701 |
10.829 |
10.734 |
10.072 |
9.656 |
M12 × 1.5 |
6g |
11.968 |
11.732 |
10.994 |
10.854 |
10.344 |
9.930 |
M12 × 1.25 |
6g |
11.972 |
11.760 |
11.160 |
11.028 |
10.619 |
10.258 |
M12 × 1.25 |
4g6g |
11.972 |
11.760 |
11.160 |
11.075 |
10.619 |
10.305 |
M12 × 1 |
6g |
11.974 |
11.794 |
11.324 |
11.206 |
10.891 |
10.590 |
M12 × 1 |
4g6g |
11.974 |
11.794 |
11.324 |
11.249 |
10.891 |
10.633 |
M14 × 2 |
6g |
13.962 |
13.682 |
12.663 |
12.503 |
11.797 |
11.271 |
M14 × 2 |
4g6g |
13.962 |
13.682 |
12.663 |
12.563 |
11.797 |
11.331 |
M14 × 1.5 |
6g |
13.968 |
13.732 |
12.994 |
12.854 |
12.344 |
11.930 |
M14 × 1.5 |
4g6g |
13.968 |
13.732 |
12.994 |
12.904 |
12.344 |
11.980 |
M15 × 1 |
6g |
14.974 |
14.794 |
14.324 |
14.206 |
13.891 |
13.590 |
M15 × 1 |
4g6g |
14.974 |
14.794 |
14.324 |
14.249 |
13.891 |
13.633 |
M16 × 2 |
6g |
15.962 |
15.682 |
14.663 |
14.503 |
13.797 |
13.271 |
M16 × 2 |
4g6g |
15.962 |
15.682 |
14.663 |
14.563 |
13.797 |
13.331 |
M16 × 1.5 |
6g |
15.968 |
15.732 |
14.994 |
14.854 |
14.344 |
13.930 |
M16 × 1.5 |
4g6g |
15.968 |
15.732 |
14.994 |
14.904 |
14.344 |
13.980 |
M17 × 1 |
6g |
16.974 |
16.794 |
16.324 |
16.206 |
15.891 |
15.590 |
M17 × 1 |
4g6g |
16.974 |
16.794 |
16.324 |
16.249 |
15.891 |
15.633 |
M18 × 1.5 |
6g |
17.968 |
17.732 |
16.994 |
16.854 |
16.344 |
15.930 |
M18 × 1.5 |
4g6g |
17.968 |
17.732 |
16.994 |
16.904 |
16.344 |
15.980 |
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