攻牙螺纹底孔对照表如下：
| 螺纹规格 | 公制粗螺纹 | 公制细螺纹 | 美制迫牙丝攻 | 钻孔径 |
| --- | --- | --- | --- | --- |
| M1×0.25 | 0.75 | 0.75 | 0.75 | 0.75 |
| M1.1×0.25 | 0.85 | 0.85 | 0.85 | 0.85 |
| M1.2×0.25 | 0.95 | 0.95 | 0.95 | 0.95 |
| M1.4×0.3 | 1.1 | 1.1 | 1.1 | 1.1 |
| M1.6×0.35 | 1.25 | 1.25 | 1.25 | 1.25 |
| M1.7×0.35 | 1.35 | 1.35 | 1.35 | 1.35 |
| M1.8×0.35 | 1.45 | 1.45 | 1.45 | 1.45 |
| M2×0.4 | 1.6 | 1.6 | 1.6 | 1.6 |
| M2.2×0.4 | 1.75 | 1.75 | 1.75 | 1.75 |
| M2.3×0.4 | 1.9 | 1.9 | 1.9 | 1.9 |
| M2.5×0.45 | 2.1 | 2.1 | 2.1 | 2.1 |
| M2.6×0.45 | 2.2 | 2.2 | 2.2 | 2.2 |
| M3×0.5 | 2.5 | 2.5 | 2.5 | 2.5 |
| M3×0.6 | 2.4 | 2.4 | 2.4 | 2.4 |
| M3.5×0.6 | 2.9 | 2.9 | 2.9 | 2.9 |
| M4×0.7 | 3.3 | 3.3 | 3.3 | 3.3 |
| M4×0.75 | 3.25 | 3.25 | 3.25 | 3.25 |
| M4.5×0.75 | 3.8 | 3.8 | 3.8 | 3.8 |
| M5×0.8 | 4.2 | 4.2 | 4.2 | 4.2 |
| M5×0.9 | 4.1 | 4.1 | 4.1 | 4.1 |
请注意，这些数据适用于一般情况下的攻牙加工，实际应用中可能需要根据具体情况进行适当调整。例如，钻头的形状、尺寸、精度以及被钻孔材料的性质都会影响所钻孔的尺寸和精度。