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ねじ下穴径度

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
M1.1×0.25 0.85 0.829
M1.2×0.25 0.95 0.929
M1.4×0.3 1.10 1.075
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 47.287
M56×5.5 50.50 50.046 50.796

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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 2.271
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 10.192
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 14.197 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 18.678
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 25.853 26.210
M30×1 29.00 28.917 29.153
M30×1.5 28.35 26.376 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

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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 1.50 1.425 1.582
No.2 -56 1.85 1.694 1.872
No.3 -48 2.10 1.941 2.146
No.4 -40 2.35 2.385 2.156
No.5 -40 2.65 2.697 2.487
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 3.962
No.12 -24 4.50 4.343 4.597
1/4 -20 5.10 4.976 5.268
5/16 -18 6.60 6.411 6.734
3/8 -16 8.00 7.805 8.164
7/16 -14 9.40 9.149 9.550
1/2 -13 10.80 10.584 11.013
9/16 -12 12.20 11.996 12.456
5/8 -11 13.50 13.376 13.868
3/4 -10 16.50 16.299 16.833
7/8 -9 19.50 19.169 19.748
1 -8 22.25 21.963 22.598
1 1/8  7 25.00 24.648 25.349
1 1/4 -7 28.00 27.823 28.524
1 3/8 -6 30.75 30.343 21.120
1 1/2 -6 34.00 33.518 34.295
1 3/4 -5 39.50 38.951 39.814
2 -4.5 45.00 44.689 45.598

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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 0.88
M1.1×0.25 0.98
M1.2×0.25 1.08
M1.4×0.3 1.25
M1.6×0.35 1.45
M1.7×0.35 1.55
M1.8×0.35 1.65
M2×0.4 1.80
M2.2×0.45 2.00
M2.3×0.4 2.10
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 4.15
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 9.25
M11×1.5 10.25
M12×1.75 11.20
M14×2 13.10
M16×2 15.10
M18×2.5 16.90
M20×2.5 18.90

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ISOメートル細目ねじ

呼び 下穴径
mm
M5×0.5 4.75
M5.5×0.5 5.25
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 13.55
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

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