中文版The screw tap tooth drills the aperture and rolls makes the diameter comparative table--Coarse thread
| The screw coarse thread attacks the tooth to drill the aperture and to roll makes the diameter comparative table | |||||||
| Metric system coarse thread | US standard coarse thread | ||||||
| Specification | Standard diameter | 2 levels of teeth drill the aperture | Specification (UNC) | Standard diameter | 2 levels of teeth drill the aperture | ||
| Biggest | Is smallest | Biggest | Is smallest | ||||
| M1.0×0.25 | 0.75 | 0.785 | 0.729 | NO.1-64(1.854) | 1.55 | 1.582 | 1.425 |
| M1.1×0.25 | 0.85 | 0.885 | 0.829 | NO.2-56(2.184) | 1.80 | 1.871 | 1.695 |
| M1.2×0.25 | 0.95 | 0.985 | 0.985 | NO.3-48(2.515) | 2.10 | 2.146 | 1.941 |
| M1.4×0.3 | 1.10 | 1.142 | 1.075 | NO.4-40(2.845) | 2.30 | 2.385 | 2.157 |
| M1.6×0.35 | 1.25 | 1.321 | 1.221 | NO.5-40(3.175) | 2.60 | 2.697 | 2.487 |
| M1.7×0.35 | 1.35 | 1.421 | 1.321 | NO.6-32(3.505) | 2.80 | 2.895 | 2.642 |
| M1.8×0.35 | 1.45 | 1.521 | 1.421 | NO8-32(4.166) | 3.40 | 3.53 | 3.302 |
| M2.0×0.4 | 1.60 | 1.679 | 1.567 | NO.10-24(4.826) | 3.90 | 3.962 | 3.683 |
| M2.2×0.45 | 1.75 | 1.838 | 1.713 | NO.12-24(5.486) | 4.50 | 4.597 | 4.344 |
| M2.3×0.4 | 1.90 | 1.979 | 1.867 | 1/4-20 | 5.10 | 5.257 | 4.979 |
| M2.5×0.45 | 2.10 | 2.138 | 2.013 | 5/16-18 | 6.60 | 6.731 | 6.401 |
| M2.6×0.45 | 2.20 | 2.238 | 2.113 | 3/8-16 | 8.00 | 8.153 | 7.798 |
| M3.0×0.5 | 2.50 | 2.599 | 2.459 | 7/16-14 | 9.40 | 9.55 | 9.144 |
| M3.0×0.6 | 2.40 | 2.440 | 2.280 | 1/2-13 | 10.80 | 11.023 | 10.592 |
| M3.5×0.6 | 2.90 | 3.010 | 2.850 | 9/16-12 | 12.20 | 12.446 | 11.989 |
| M4.0×0.7 | 3.30 | 3.422 | 3.242 | 5/8-11 | 13.60 | 12.868 | 13.386 |
| M4.0×0.75 | 3.25 | 3.326 | 3.106 | 3/4-10 | 16.50 | 18.840 | 16.307 |
| M4.5×0.75 | 3.80 | 3.878 | 3.688 | 7/8-9 | 19.50 | 19.761 | 19.177 |
| M5.0×0.8 | 4.20 | 4.334 | 4.134 | 1 | 22.20 | 22.606 | 21.971 |
| M5.0×0.9 | 4.10 | 4.170 | 3.930 | 1-1/8-7 | 25.00 | 25.349 | 24.638 |
| M6.0×1.0 | 5.00 | 5.153 | 4.917 | 1-1/4-7 | 28.20 | 28.524 | 27.813 |
| M7.0×1.0 | 6.00 | 6.153 | 5.917 | 1-3/8-6 | 30.80 | 31.115 | 30.353 |
| M8.0×1.25 | 6.80 | 6.912 | 6.647 | 1-1/2-6 | 34.00 | 34.290 | 33.528 |
| M9.0×1.25 | 7.80 | 7.912 | 7.647 | 1-3/4-5 | 39.50 | 39.827 | 38.964 |
| M10×1.5 | 8.50 | 8.676 | 8.376 | 2-4-1/2 | 45.20 | 45.593 | 44.679 |
| M11×1.5 | 9.50 | 9.676 | 9.376 | ||||
| M12×1.75 | 10.30 | 10.441 | 10.106 | ||||
| M14×2.0 | 12.00 | 12.210 | 11.835 | ||||
| M16×2.0 | 14.00 | 14.210 | 13.835 | ||||
| M18×2.5 | 15.50 | 15.744 | 15.294 | ||||
| M20×2.5 | 17.50 | 17.744 | 17.294 | ||||
| M22×2.5 | 19.50 | 19.744 | 19.294 | ||||
| M24×3.0 | 21.00 | 21.252 | 20.752 | ||||
| M27×3.0 | 24.00 | 24.252 | 23.752 | ||||
| M30×3.5 | 26.50 | 26.771 | 26.211 | ||||
