The ISO metric screw threads are the worldwide most commonly used type of general-purpose screw thread. They were one of the first international standards agreed upon when the International Organization for Standardization (ISO) was set up in 1947.
The design principles of ISO general-purpose metric screw threads ("M" series threads) are defined in international standard ISO 68-1. Each thread is characterized by its major diameter and its pitch. ISO metric threads consist of symmetric V-shaped thread. In the plane of the thread axis, the flanks of the V have an angle of 60掳 to each other.
ISO 261 specifies a detailed list of preferred combinations of outer diameter and pitch for ISO metric screw threads. The 1st choice column follows the R10 series from ISO 3, while the 2nd choice column is rounded off values from the R20 series from ISO 3.
ISO 262 specifies a shorter list of thread dimensions - a subset of ISO 261.
Superfine pitch metric threads are occasionally used in automotive components, such as suspension struts, and are commonly used in the aviation manufacturing industry. This is because extra fine threads are more resistant to coming loose from vibrations.
TPI stands for Threads Per Inch, which means the total number of threads per inch measured along the length of a fastener. TPI is used only with American fasteners. Metric Fasteners use a thread Pitch. In general, smaller fasteners have finer threads, so the thread count is higher.
Metric fasteners are specified with a thread pitch, instead of a thread count. The thread pitch is the distance between threads expressed in millimeters. In general, smaller fasteners have finer threads, so they have a lower thread pitch.
ISO Metric profile | External Thread | Internal Thread | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Thread | Major Diameter | Pitch Diameter | Minor Diameter | Minor Diameter | Pitch Diameter | Major Diameter | Tap | ||||||
Size x Pitch | max | min | max | min | max | min | min | max | min | max | min | max | Drill |
M 2 x 0.4 | 1.981 | 1.886 | 1.721 | 1.654 | 1.548 | 1.408 | 1.567 | 1.679 | 1.74 | 1.83 | 2 | 2.148 | 1.6 |
M 2.2 x 0.45 | 2.18 | 2.08 | 1.888 | 1.817 | 1.693 | 1.54 | 1.713 | 1.838 | 1.908 | 2.003 | 2.2 | 2.36 | 1.75 |
M 2.3 x 0.45 | 2.28 | 2.18 | 1.988 | 1.917 | 1.793 | 1.64 | 1.813 | 1.938 | 2.008 | 2.103 | 2.3 | 2.46 | 1.85 |
M 2.5 x 0.45 | 2.48 | 2.38 | 2.188 | 2.117 | 1.993 | 1.84 | 2.013 | 2.138 | 2.208 | 2.303 | 2.5 | 2.66 | 2.05 |
M 2.6 x 0.45 | 2.58 | 2.48 | 2.288 | 2.217 | 2.093 | 1.94 | 2.113 | 2.238 | 2.308 | 2.393 | 2.6 | 2.75 | 2.15 |
M 3 x 0.5 | 2.98 | 2.874 | 2.655 | 2.58 | 2.439 | 2.272 | 2.459 | 2.599 | 2.675 | 2.775 | 3 | 3.172 | 2.5 |
M 3.5 x 0.6 | 3.479 | 3.354 | 3.089 | 3.004 | 2.829 | 2.635 | 2.85 | 3.01 | 3.11 | 3.222 | 3.5 | 3.699 | 2.9 |
M 4 x 0.7 | 3.978 | 3.838 | 3.523 | 3.433 | 3.22 | 3.002 | 3.242 | 3.422 | 3.545 | 3.663 | 4 | 4.219 | 3.3 |
M 4.5 x 0.75 | 4.478 | 4.338 | 3.991 | 3.901 | 3.666 | 3.439 | 3.688 | 3.878 | 4.013 | 4.131 | 4.5 | 4.726 | 3.75 |
M 5 x 0.8 | 4.976 | 4.826 | 4.456 | 4.361 | 4.11 | 3.869 | 4.134 | 4.334 | 4.48 | 4.605 | 5 | 5.24 | 4.2 |
M 5.5 x 0.5 | 5.48 | 5.374 | 5.155 | 5.065 | 4.939 | 4.757 | 4.959 | 5.099 | 5.175 | 5.295 | 5.5 | 5.692 | 5 |
M 6 x 1 | 5.974 | 5.794 | 5.324 | 5.212 | 4.891 | 4.596 | 4.917 | 5.153 | 5.35 | 5.5 | 6 | 6.294 | 5 |
M 7 x 1 | 6.974 | 6.794 | 6.324 | 6.212 | 5.891 | 5.596 | 5.917 | 6.153 | 6.35 | 6.5 | 7 | 7.294 | 6 |
M 8 x 1.25 | 7.972 | 7.76 | 7.16 | 7.042 | 6.619 | 6.272 | 6.647 | 6.912 | 7.188 | 7.348 | 8 | 8.34 | 6.75 |
M 9 x 1.25 | 8.972 | 8.76 | 8.16 | 8.042 | 7.619 | 7.272 | 7.647 | 7.912 | 8.188 | 8.348 | 9 | 9.34 | 7.75 |
M 10 x 1.5 | 9.968 | 9.732 | 8.994 | 8.862 | 8.344 | 7.938 | 8.376 | 8.676 | 9.026 | 9.206 | 10 | 10.396 | 8.5 |
M 11 x 1.5 | 10.97 | 10.73 | 9.994 | 9.862 | 9.344 | 8.938 | 9.376 | 9.676 | 10.026 | 10.196 | 11 | 11.387 | 9.5 |
M 12 x 1.75 | 11.97 | 11.7 | 10.83 | 10.68 | 10.072 | 9.601 | 10.106 | 10.441 | 10.863 | 11.063 | 12 | 12.453 | 10.25 |
M 14 x 2 | 13.96 | 13.68 | 12.66 | 12.5 | 11.797 | 11.271 | 11.835 | 12.21 | 12.701 | 12.913 | 14 | 14.501 | 12 |
M 15 x 1.5 | 14.97 | 14.73 | 13.99 | 13.85 | 13.344 | 12.93 | 13.376 | 13.676 | 14.026 | 14.216 | 15 | 15.407 | 13.5 |
M 16 x 2 | 15.96 | 15.68 | 14.66 | 14.5 | 13.797 | 13.271 | 13.835 | 14.21 | 14.701 | 14.913 | 16 | 16.501 | 14 |
M 17 x 1.5 | 16.97 | 16.73 | 15.99 | 15.85 | 15.344 | 14.93 | 15.376 | 15.676 | 16.026 | 16.216 | 17 | 17.407 | 15.5 |
M 18 x 2.5 | 17.96 | 17.62 | 16.33 | 16.16 | 15.252 | 14.624 | 15.294 | 15.744 | 16.376 | 16.601 | 18 | 18.585 | 15.5 |
M 20 x 2.5 | 19.96 | 19.62 | 18.33 | 18.16 | 17.252 | 16.624 | 17.294 | 17.744 | 18.376 | 18.6 | 20 | 20.585 | 17.5 |
M 22 x 3 | 21.95 | 21.58 | 20 | 19.82 | 18.704 | 17.97 | 18.752 | 19.252 | 20.051 | 20.296 | 22 | 22.677 | 19 |
M 24 x 3 | 23.95 | 23.58 | 22 | 21.8 | 20.704 | 19.955 | 20.752 | 21.252 | 22.051 | 22.316 | 24 | 24.698 | 21 |
M 25 x 2 | 24.96 | 24.68 | 23.66 | 23.49 | 22.797 | 22.261 | 22.835 | 23.21 | 23.701 | 23.925 | 25 | 25.513 | 23 |
M 26 x 1.5 | 25.97 | 25.73 | 24.99 | 24.84 | 24.344 | 23.92 | 24.376 | 24.676 | 25.026 | 25.226 | 26 | 26.417 | 24.5 |
M 27 x 3 | 26.95 | 26.58 | 25 | 24.8 | 23.704 | 22.955 | 23.752 | 24.252 | 25.051 | 25.316 | 27 | 27.698 | 24 |
M 28 x 2 | 27.96 | 27.68 | 26.66 | 26.49 | 25.797 | 25.261 | 25.835 | 26.21 | 26.701 | 26.925 | 28 | 28.513 | 26 |
M 30 x 3.5 | 29.95 | 29.52 | 27.67 | 27.46 | 26.158 | 25.306 | 26.211 | 26.771 | 27.727 | 28.007 | 30 | 30.785 | 26.5 |
M 32 x 2 | 31.96 | 31.68 | 30.66 | 30.49 | 29.797 | 29.261 | 29.835 | 30.21 | 30.701 | 30.925 | 32 | 32.513 | 30 |
M 33 x 3.5 | 32.97 | 32.54 | 30.7 | 30.48 | 29.179 | 28.327 | 29.211 | 29.771 | 30.727 | 31.007 | 33 | 33.785 | 29.5 |
M 35 x 1.5 | 34.97 | 34.73 | 33.99 | 33.84 | 33.344 | 32.92 | 33.376 | 33.676 | 34.026 | 34.226 | 35 | 35.416 | 33.5 |
M 36 x 4 | 35.94 | 35.47 | 33.34 | 33.12 | 31.61 | 30.654 | 31.67 | 32.27 | 33.402 | 33.702 | 36 | 36.877 | 32 |
M 38 x 1.5 | 37.97 | 37.73 | 36.99 | 36.84 | 36.344 | 35.92 | 36.376 | 36.676 | 37.026 | 37.226 | 38 | 38.417 | 36.5 |
M 39 x 4 | 38.94 | 38.47 | 36.34 | 36.12 | 34.61 | 33.654 | 34.67 | 35.27 | 36.402 | 36.702 | 39 | 39.877 | 35 |
M 40 x 3 | 39.95 | 39.58 | 38 | 37.8 | 36.704 | 35.955 | 36.752 | 37.252 | 38.051 | 38.316 | 40 | 40.698 | 37 |
M 42 x 4.5 | 41.94 | 41.44 | 39.01 | 38.78 | 37.066 | 36.006 | 37.129 | 37.799 | 39.077 | 39.392 | 42 | 42.965 | 37.5 |
M 45 x 4.5 | 44.94 | 44.44 | 42.01 | 41.78 | 40.066 | 39.006 | 40.129 | 40.799 | 42.077 | 42.392 | 45 | 45.965 | 40.5 |
M 48 x 5 | 47.93 | 47.4 | 44.68 | 44.43 | 42.516 | 41.351 | 42.587 | 43.297 | 44.752 | 45.087 | 48 | 49.057 | 43 |
M 50 x 4 | 49.94 | 49.47 | 47.34 | 47.11 | 45.61 | 44.642 | 45.67 | 46.27 | 47.402 | 47.717 | 50 | 50.892 | 46 |
M 52 x 5 | 51.93 | 51.4 | 48.68 | 48.45 | 46.516 | 45.365 | 46.587 | 47.297 | 48.752 | 49.067 | 52 | 53.037 | 47 |
M 55 x 4 | 54.94 | 54.47 | 52.34 | 52.11 | 50.61 | 49.642 | 50.67 | 51.27 | 52.402 | 52.717 | 55 | 55.892 | 51 |
M 56 x 5.5 | 55.93 | 55.37 | 52.35 | 52.09 | 49.971 | 48.7 | 50.046 | 50.796 | 52.428 | 52.783 | 56 | 57.149 | 50.5 |
M 58 x 4 | 57.94 | 57.47 | 55.34 | 55.11 | 53.61 | 52.642 | 53.67 | 54.27 | 55.402 | 55.717 | 58 | 58.892 | 54 |
M 60 x 5.5 | 59.93 | 59.37 | 56.35 | 56.09 | 53.971 | 52.7 | 54.046 | 54.796 | 56.428 | 56.783 | 60 | 61.149 | 54.5 |
M 62 x 4 | 61.94 | 61.47 | 59.34 | 59.11 | 57.61 | 56.642 | 57.67 | 58.27 | 59.402 | 59.717 | 62 | 62.892 | 58 |
M 63 x 1.5 | 62.97 | 62.73 | 61.99 | 61.83 | 61.344 | 60.91 | 61.376 | 61.676 | 62.026 | 62.238 | 63 | 63.429 | 61.5 |
M 64 x 6 | 63.92 | 63.32 | 60.02 | 59.74 | 57.425 | 56.047 | 57.505 | 58.305 | 60.103 | 60.478 | 64 | 65.241 | 58 |
M 65 x 4 | 64.94 | 64.47 | 62.34 | 62.11 | 60.61 | 59.642 | 60.67 | 61.27 | 62.402 | 62.717 | 65 | 65.892 | 61 |
M 68 x 6 | 67.92 | 67.32 | 64.02 | 63.74 | 61.425 | 60.047 | 61.505 | 62.305 | 64.103 | 64.478 | 68 | 69.241 | 62 |
M 70 x 6 | 69.92 | 69.32 | 66.02 | 65.74 | 63.425 | 62.047 | 63.505 | 64.305 | 66.103 | 66.478 | 70 | 71.241 | 64 |
M 72 x 6 | 71.92 | 71.32 | 68.02 | 67.74 | 65.425 | 64.047 | 65.505 | 66.305 | 68.103 | 68.478 | 72 | 73.241 | 66 |
M 75 x 6 | 74.92 | 74.32 | 71.02 | 70.74 | 68.425 | 67.047 | 68.505 | 69.305 | 71.103 | 71.478 | 75 | 76.241 | 69 |
M 76 x 6 | 75.92 | 75.32 | 72.02 | 71.74 | 69.425 | 68.047 | 69.505 | 70.305 | 72.103 | 72.478 | 76 | 77.241 | 70 |
M 78 x 2 | 77.96 | 77.68 | 76.66 | 76.48 | 75.797 | 75.251 | 75.835 | 76.21 | 76.701 | 76.937 | 78 | 78.525 | 76 |
M 80 x 6 | 79.92 | 79.32 | 76.02 | 75.74 | 73.425 | 72.047 | 73.505 | 74.305 | 76.103 | 76.478 | 80 | 81.241 | 74 |
M 82 x 2 | 81.96 | 81.68 | 80.66 | 80.48 | 79.797 | 79.251 | 79.835 | 80.21 | 80.701 | 80.937 | 82 | 82.525 | 80 |
M 85 x 6 | 84.92 | 84.32 | 81.02 | 80.74 | 78.425 | 77.047 | 78.505 | 79.305 | 81.103 | 81.478 | 85 | 86.241 | 79 |
M 90 x 6 | 89.92 | 89.32 | 86.02 | 85.74 | 83.425 | 82.047 | 83.505 | 84.305 | 86.103 | 86.478 | 90 | 91.241 | 84 |
M 95 x 6 | 94.92 | 94.32 | 91.02 | 90.72 | 88.425 | 87.027 | 88.505 | 89.305 | 91.103 | 91.503 | 95 | 96.266 | 89 |
M 100 x 6 | 99.92 | 99.32 | 96.02 | 95.72 | 93.425 | 92.027 | 93.505 | 94.305 | 96.103 | 96.503 | 100 | 101.27 | 94 |
1st choice | 2nd choice | Coarse | Fine |
---|---|---|---|
1 | - | 0.25 | 0.2 |
1.2 | - | 0.25 | 0.2 |
- | 1.4 | 0.3 | 0.2 |
1.6 | - | 0.35 | 0.2 |
- | 1.8 | 0.35 | 0.2 |
2 | - | 0.4 | 0.25 |
2.5 | - | 0.45 | 0.35 |
3 | - | 0.5 | 0.35 |
- | 3.5 | 0.6 | 0.35 |
4 | - | 0.7 | 0.5 |
5 | - | 0.8 | 0.5 |
6 | - | 1 | 0.75 |
- | 7 | 1 | 0.75 |
8 | - | 1.25 | 1 | 0.75 |
10 | - | 1.5 | 1.25 | 1 |
12 | - | 1.75 | 1.5 | 1.25 |
- | 14 | 2 | 1.5 |
16 | - | 2 | 1.5 |
- | 18 | 2.5 | 2 | 1.5 |
20 | - | 2.5 | 2 | 1.5 |
- | 22 | 2.5 | 2 | 1.5 |
24 | - | 3 | 2 |
- | 27 | 3 | 2 |
30 | - | 3.5 | 2 |
- | 33 | 3.5 | 2 |
36 | - | 4 | 3 |
- | 39 | 4 | 3 |
42 | - | 4.5 | 3 |
- | 45 | 4.5 | 3 |
48 | - | 5 | 3 |
- | 52 | 5 | 4 |
56 | - | 5.5 | 4 |
- | 60 | 5.5 | 4 |
64 | - | 6 | 4 |
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