ねじ下穴径表
ねじ下穴径度
ISOメートル並目ねじ
| 呼び | 下穴径 mm |
最小寸法 min mm |
最大寸法 max mm |
|---|---|---|---|
| M1×0.25 | 0.75 | 0.729 | 0.785 |
| M1.1×0.25 | 0.85 | 0.829 | 0.885 |
| M1.2×0.25 | 0.95 | 0.929 | 0.985 |
| M1.4×0.3 | 1.10 | 1.075 | 1.142 |
| M1.6×0.35 | 1.25 | 1.221 | 1.321 |
| M1.8×0.35 | 1.45 | 1.421 | 1.521 |
| M2×0.4 | 1.60 | 1.567 | 1.679 |
| M2.2×0.45 | 1.75 | 1.713 | 1.838 |
| M2.5×0.45 | 2.05 | 2.013 | 2.138 |
| M3×0.5 | 2.50 | 2.459 | 2.599 |
| M3.5×0.6 | 2.90 | 2.850 | 3.010 |
| M4×0.7 | 3.30 | 3.242 | 3.422 |
| M4.5×0.75 | 3.70 | 3.688 | 3.878 |
| M5×0.8 | 4.20 | 4.134 | 4.334 |
| M6×1 | 5.00 | 4.917 | 5.153 |
| M7×1 | 6.00 | 5.917 | 6.153 |
| M8×1.25 | 6.80 | 6.647 | 6.912 |
| M9×1.25 | 7.80 | 7.647 | 7.912 |
| M10×1.5 | 8.50 | 8.376 | 8.676 |
| M11×1.5 | 9.50 | 9.376 | 9.676 |
| M12×1.75 | 10.20 | 10.106 | 10.441 |
| M14×2 | 12.00 | 11.835 | 12.210 |
| M16×2 | 14.00 | 13.835 | 14.210 |
| M18×2.5 | 15.50 | 15.294 | 15.744 |
| M20×2.5 | 17.50 | 17.294 | 17.744 |
| M22×2.5 | 19.50 | 19.294 | 19.744 |
| M24×3 | 21.00 | 20.752 | 21.252 |
| M27×3 | 24.00 | 23.752 | 24.252 |
| M30×3.5 | 26.50 | 26.211 | 26.771 |
| M33×3.5 | 29.50 | 29.211 | 29.771 |
| M36×4 | 32.00 | 31.670 | 32.270 |
| M39×4 | 35.00 | 34.670 | 35.270 |
| M42×4.5 | 37.50 | 37.129 | 37.799 |
| M45×4.5 | 40.50 | 40.129 | 40.799 |
| M48×5 | 43.00 | 42.587 | 43.297 |
| M52×5 | 47.00 | 46.587 | 47.297 |
| M56×5.5 | 50.50 | 50.046 | 50.796 |
ISOメートル細目ねじ
| 呼び | 下穴径 mm |
最小寸法 min mm |
最大寸法 max mm |
|---|---|---|---|
| M2.5×0.35 | 2.15 | 2.121 | 2.221 |
| M3×0.35 | 2.65 | 2.621 | 2.721 |
| M3.5×0.35 | 3.15 | 3.121 | 3.221 |
| M4×0.5 | 3.50 | 3.459 | 3.599 |
| M4.5×0.5 | 4.00 | 3.959 | 4.099 |
| M5×0.5 | 4.50 | 4.459 | 4.599 |
| M5.5×0.5 | 5.00 | 4.959 | 5.099 |
| M6×0.75 | 5.20 | 5.188 | 5.378 |
| M7×0.75 | 6.20 | 6.188 | 6.378 |
| M8×0.75 | 7.20 | 7.188 | 7.378 |
| M8×1 | 7.00 | 6.917 | 7.153 |
| M9×0.75 | 8.20 | 8.188 | 8.378 |
| M9×1 | 8.00 | 7.917 | 8.153 |
| M10×0.75 | 9.20 | 9.188 | 9.378 |
| M10×1 | 9.00 | 8.917 | 9.153 |
| M10×1.25 | 8.80 | 8.647 | 8.912 |
| M11×0.75 | 10.20 | 10.188 | 10.378 |
| M11×1 | 10.00 | 9.917 | 10.153 |
| M12×1 | 11.00 | 10.917 | 11.153 |
| M12×1.25 | 10.80 | 10.647 | 10.912 |
| M12×1.5 | 10.50 | 10.376 | 10.676 |
| M14×1 | 13.00 | 12.917 | 13.153 |
| M14×1.25 | 12.80 | 12.647 | 12.912 |
| M14×1.5 | 12.50 | 12.376 | 12.676 |
| M15×1 | 14.00 | 13.917 | 14.153 |
| M15×1.5 | 13.50 | 13.376 | 13.676 |
| M16×1 | 15.00 | 14.917 | 15.153 |
| M16×1.5 | 14.50 | 14.376 | 14.676 |
| M17×1 | 16.00 | 15.917 | 16.153 |
| M17×1.5 | 15.50 | 15.376 | 15.676 |
| M18×1 | 17.00 | 16.917 | 17.153 |
| M18×1.5 | 16.50 | 16.376 | 16.676 |
| M18×2 | 16.00 | 15.835 | 16.210 |
| M20×1 | 19.00 | 18.917 | 19.153 |
| M20×1.5 | 18.50 | 18.376 | 18.676 |
| M20×2 | 18.00 | 17.835 | 18.210 |
| M22×1 | 21.00 | 20.917 | 21.153 |
| M22×1.5 | 20.50 | 20.376 | 20.676 |
| M22×2 | 20.00 | 19.835 | 20.210 |
| M24×1 | 23.00 | 22.917 | 23.153 |
| M24×1.5 | 22.50 | 22.376 | 22.676 |
| M24×2 | 22.00 | 21.835 | 22.210 |
| M25×1 | 24.00 | 23.917 | 24.153 |
| M25×1.5 | 23.50 | 23.376 | 23.676 |
| M25×2 | 23.00 | 23.835 | 23.210 |
| M27×1 | 26.00 | 25.917 | 26.153 |
| M27×1.5 | 25.50 | 25.376 | 25.676 |
| M27×2 | 25.00 | 24.835 | 25.210 |
| M28×1 | 27.00 | 26.917 | 27.153 |
| M28×1.5 | 26.50 | 26.376 | 26.676 |
| M28×2 | 26.00 | 25.835 | 26.210 |
| M30×1 | 29.00 | 28.917 | 29.153 |
| M30×1.5 | 28.50 | 28.376 | 28.676 |
| M30×2 | 28.00 | 27.835 | 28.210 |
| M30×3 | 27.00 | 26.752 | 27.252 |
| M32×1.5 | 30.50 | 30.376 | 30.676 |
| M32×2 | 30.00 | 29.835 | 30.210 |
| M33×1.5 | 31.50 | 31.376 | 31.676 |
| M33×2 | 31.00 | 30.835 | 31.210 |
| M33×3 | 30.00 | 29.752 | 30.252 |
| M35×1.5 | 33.50 | 33.376 | 33.676 |
| M36×1.5 | 34.50 | 34.376 | 34.676 |
ユニファイ並目ねじ
| 呼び | 下穴径 mm |
最小寸法 min mm |
最大寸法 max mm |
|---|---|---|---|
| No.1 -64 | 1.55 | 1.425 | 1.580 |
| No.2 -56 | 1.85 | 1.694 | 1.872 |
| No.3 -48 | 2.10 | 1.941 | 2.146 |
| No.4 -40 | 2.35 | 2.157 | 2.385 |
| No.5 -40 | 2.65 | 2.487 | 2.698 |
| No.6 -32 | 2.85 | 2.642 | 2.896 |
| No.8 -32 | 3.50 | 3.302 | 3.531 |
| No.10 -24 | 3.90 | 3.683 | 3.937 |
| No.12 -24 | 4.50 | 4.343 | 4.597 |
| 1/4 -20 | 5.10 | 4.978 | 5.258 |
| 5/16 -18 | 6.60 | 6.401 | 6.731 |
| 3/8 -16 | 8.00 | 7.798 | 8.153 |
| 7/16 -14 | 9.40 | 9.144 | 9.550 |
| 1/2 -13 | 10.80 | 10.592 | 11.024 |
| 9/16 -12 | 12.20 | 11.989 | 12.446 |
| 5/8 -11 | 13.50 | 13.386 | 13.868 |
| 3/4 -10 | 16.50 | 16.307 | 16.840 |
| 7/8 -9 | 19.50 | 19.177 | 19.761 |
| 1 -8 | 22.25 | 21.971 | 22.606 |
| 1 1/8 7 | 25.00 | 24.638 | 25.349 |
| 1 1/4 -7 | 28.00 | 27.813 | 28.524 |
| 1 3/8 -6 | 30.75 | 30.353 | 31.115 |
| 1 1/2 -6 | 34.00 | 33.528 | 34.290 |
| 1 3/4 -5 | 39.50 | 38.938 | 39.802 |
| 2 -4.5 | 45.00 | 44.679 | 45.593 |
ねじ下穴径表 フルートレスタップ（転造タップ）
ISOメートル並目ねじ
| 呼び | 下穴径 mm |
|---|---|
| M1×0.25 | 0.90 |
| M1.1×0.25 | 1.00 |
| M1.2×0.25 | 1.10 |
| M1.4×0.3 | 1.28 |
| M1.6×0.35 | 1.46 |
| M1.7×0.35 | 1.56 |
| M1.8×0.35 | 1.66 |
| M2×0.4 | 1.85 |
| M2.2×0.45 | 2.00 |
| M2.3×0.4 | 2.11 |
| M2.5×0.45 | 2.30 |
| M2.6×0.45 | 2.40 |
| M3×0.5 | 2.80 |
| M3.5×0.6 | 3.25 |
| M4×0.7 | 3.70 |
| M4.5×0.75 | 4.20 |
| M5×0.8 | 4.65 |
| M6×1 | 5.55 |
| M7×1 | 6.55 |
| M8×1.25 | 7.40 |
| M9×1.25 | 8.40 |
| M10×1.5 | 9.30 |
| M11×1.5 | 10.30 |
| M12×1.75 | 11.20 |
| M14×2 | 13.10 |
| M16×2 | 15.10 |
| M18×2.5 | 16.90 |
| M20×2.5 | 18.90 |
ISOメートル細目ねじ
| 呼び | 下穴径 mm |
|---|---|
| M5×0.5 | 4.80 |
| M5.5×0.5 | 5.30 |
| M6×0.75 | 5.65 |
| M7×0.75 | 6.65 |
| M8×0.75 | 7.65 |
| M8×1 | 7.55 |
| M9×0.75 | 8.65 |
| M9×1 | 8.55 |
| M10×0.75 | 9.65 |
| M10×1 | 9.55 |
| M10×1.25 | 9.40 |
| M11×0.75 | 10.65 |
| M11×1 | 10.55 |
| M12×1 | 11.55 |
| M12×1.25 | 11.40 |
| M12×1.5 | 11.30 |
| M14×1 | 13.55 |
| M14×1.25 | 13.40 |
| M14×1.5 | 13.30 |
| M15×1 | 14.55 |
| M15×1.5 | 14.30 |
| M16×1 | 15.55 |
| M16×1.5 | 15.30 |
| M17×1 | 16.55 |
| M17×1.5 | 16.30 |
| M18×1 | 17.55 |
| M18×1.5 | 17.30 |
| M18×2 | 17.10 |
| M20×1 | 19.55 |