Machine Screw Size
Machine screw is measured in millimeters (mm), such as M6 or M8 screws. The threads are divided into coarse threads and fine threads which can be selected according to the application range. The coarse thread has a larger pitch and stronger strength, which is suitable for general locking function. The fine thread has a smaller pitch, the strength is weaker but the fit is better. The machine screw is widely used in various industries worldwide and is one of the most common screw type in manufacturing and industrial applications.
The mechanical screw specification table is mainly based on international standards such as ISO, DIN, JIS etc. In addition to basic size and strength information, it may also include more detailed information such as the screw type, head and thread shape etc., which can help users choose the material and surface treatment of the screws, also fit specific application requirements and ensure the safety and reliability of the lock function.
| M/M MACHINE SCREW 2A Q (60°) - COARSE THREAD | ||||||
|---|---|---|---|---|---|---|
SIZE | Pitch (P) | Major Diameter (D) | Rolling Diameter (d) | (B) 牙山 膨漲數 | ||
| Maximum (MAX) | Minimum (MIN) | Maximum (MAX) | Minimum (MIN) | |||
| M2 | 0.4 | 1.980 | 1.890 | 1.70 | 1.67 | 0.250 |
| 2.3 | 0.4 | 2.280 | 2.190 | 2.00 | 1.97 | 0.250 |
| 2.6 | 0.45 | 2.580 | 2.480 | 2.26 | 2.23 | 0.281 |
| 3 | 0.5 | 2.980 | 2.870 | 2.63 | 2.60 | 0.313 |
| 3.5 | 0.6 | 3.470 | 3.360 | 3.06 | 3.03 | 0.375 |
| 4 | 0.7 | 3.978 | 3.838 | 3.49 | 3.45 | 0.438 |
| 4.5 | 0.75 | 4.470 | 4.340 | 3.96 | 3.92 | 0.468 |
| 5 | 0.8 | 4.976 | 4.826 | 4.43 | 4.38 | 0.500 |
| 6 | 1.0 | 5.970 | 5.820 | 5.30 | 5.25 | 0.625 |
| 7 | 1.0 | 6.970 | 6.820 | 6.30 | 6.25 | 0.625 |
| 8 | 1.25 | 7.960 | 7.790 | 7.12 | 7.07 | 0.782 |
| 9 | 1.25 | 8.960 | 8.790 | 8.12 | 8.07 | 0.782 |
| 10 | 1.5 | 9.960 | 9.770 | 8.97 | 8.91 | 0.940 |
| 11 | 1.5 | 10.968 | 10.732 | 9.97 | 9.91 | 0.940 |
| 12 | 1.75 | 11.950 | 11.760 | 10.79 | 10.73 | 1.094 |
| 14 | 2.0 | 13.950 | 13.740 | 12.63 | 12.56 | 1.264 |
| 16 | 2.0 | 15.950 | 15.740 | 14.63 | 14.56 | 1.264 |
| 18 | 2.5 | 17.950 | 17.710 | 16.31 | 16.23 | 1.560 |
| 20 | 2.5 | 19.950 | 19.710 | 18.31 | 18.23 | 1.560 |
| 22 | 2.5 | 21.950 | 21.710 | 20.31 | 20.23 | 1.560 |
| 24 | 3.0 | 23.940 | 23.680 | 21.98 | 21.90 | 1.870 |
| 27 | 3.0 | 26.940 | 26.680 | 24.98 | 24.89 | 1.870 |
| 30 | 3.5 | 29.940 | 29.660 | 27.66 | 27.56 | 2.190 |
| 33 | 3.5 | 32.940 | 32.660 | 30.65 | 30.56 | 2.190 |
| 36 | 4.0 | 35.930 | 35.630 | 33.33 | 33.23 | 2.500 |
| M/M MACHINE SCREW 2A Q (60°) - FINE THREAD | ||||||
|---|---|---|---|---|---|---|
SIZE | Pitch (P) | Major Diameter (D) | Rolling Diameter (d) | (B) 牙山 膨漲數 | ||
| Maximum (MAX) | Minimum (MIN) | Maximum (MAX) | Minimum (MIN) | |||
| M4 | 0.5 | 3.980 | 3.874 | 3.61 | 3.57 | 0.313 |
| 4.5 | 0.5 | 4.480 | 4.374 | 4.11 | 4.07 | 0.313 |
| 5 | 0.50 | 4.980 | 4.874 | 4.61 | 4.57 | 0.313 |
| 6 | 0.8 | 5.978 | 5.838 | 5.45 | 5.41 | 0.468 |
| 7 | 0.8 | 6.978 | 6.838 | 6.45 | 6.41 | 0.468 |
| 8 | 1.0 | 7.974 | 7.794 | 7.29 | 7.24 | 0.625 |
| 9 | 1.00 | 8.974 | 8.794 | 8.29 | 8.24 | 0.625 |
| 10 | 1.3 | 9.972 | 9.760 | 9.12 | 9.07 | 0.782 |
| 10 | 1.0 | 9.974 | 9.794 | 9.28 | 9.23 | 0.625 |
| 12 | 1.3 | 11.972 | 11.760 | 11.12 | 11.07 | 0.782 |
| 12 | 1.50 | 11.968 | 11.732 | 10.95 | 10.89 | 0.940 |
| 14 | 1.50 | 13.968 | 13.732 | 12.95 | 12.89 | 0.940 |
| 16 | 1.5 | 15.968 | 15.732 | 14.95 | 14.89 | 0.940 |
| 18 | 2.0 | 17.962 | 17.682 | 16.62 | 16.54 | 1.264 |
| 18 | 1.50 | 17.968 | 17.732 | 16.93 | 16.86 | 0.940 |
| 20 | 2.0 | 19.962 | 19.682 | 18.62 | 18.54 | 1.264 |
| 20 | 1.5 | 19.968 | 19.732 | 18.92 | 18.85 | 0.940 |
| 22 | 1.5 | 21.968 | 21.732 | 20.92 | 20.85 | 0.940 |
| 24 | 1.5 | 23.968 | 23.732 | 22.92 | 22.85 | 0.940 |
| 26 | 1.5 | 25.968 | 25.732 | 24.93 | 24.85 | 0.940 |
| 27 | 1.5 | 26.968 | 26.732 | 25.93 | 25.85 | 0.940 |
| 28 | 1.5 | 27.968 | 27.732 | 26.93 | 26.85 | 0.940 |
| 30 | 1.5 | 29.968 | 29.732 | 28.93 | 28.85 | 0.940 |
| 32 | 1.5 | 31.968 | 31.732 | 30.93 | 30.85 | 0.940 |
| 33 | 1.5 | 32.968 | 32.732 | 31.93 | 31.85 | 0.940 |