米厘牙規格 MACHINE SCREW M/M 2A Q (60”)
Size (號稱)：1.4~16.0
P (牙距)：0.3~2.0
D (外徑)：最小1.320~最大15.950
國際公制標準螺紋 (International Metric Thread System)
- 公制螺紋：粗牙及細牙兩種
- 公制螺紋：MM (毫米)為單位
- 螺紋角：60度，規格以M表示
- 例如：M 8 * P 1.25
(M：代號8mm，螺絲直徑；P：pich，代表螺距，P 1.25)
螺絲規格表
| SIZE 號稱 |
P 牙距 |
外徑 MAX |
外徑 MIN |
|---|---|---|---|
| 1.4 | 0.3 | 1.380 | 1.320 |
| 1.6 | 0.35 | 1.581 | 1.496 |
| 1.7 | 0.35 | 1.680 | 1.610 |
| 2.0 | 0.4 | 1.980 | 1.890 |
| 2.3 | 0.4 | 2.280 | 2.190 |
| 2.6 | 0.45 | 2.580 | 2.480 |
| 3.0 | 0.5 | 2.980 | 2.874 |
| 3.0 | 0.6 | 2.980 | 2.870 |
| 3.5 | 0.6 | 3.470 | 3.360 |
| 4.0 | 0.7 | 3.978 | 3.838 |
| 4.0 | 0.75 | 3.978 | 3.838 |
| 4.5 | 0.75 | 4.470 | 4.340 |
| 5.0 | 0.8 | 4.976 | 4.826 |
| 5.0 | 0.9 | 4.970 | 4.820 |
| 6.0 | 1.0 | 5.970 | 5.820 |
| 7.0 | 1.0 | 6.970 | 6.820 |
| 8.0 | 1.25 | 7.960 | 7.790 |
| 10/0 | 1.25 | 9.960 | 9.790 |
| 10/0 | 1.5 | 9.960 | 9.770 |
| 12.0 | 1.5 | 11.96 | 11.770 |
| 12.0 | 1.75 | 11.950 | 11.760 |
| 14.0 | 2.0 | 13.950 | 13.740 |
| 16.0 | 2.0 | 15.950 | 15.740 |