螺絲攻牙鉆孔徑對照表

公制粗螺紋

公制細螺紋

規格

標準徑

2級鉆孔徑

規格

標準徑

2級鉆孔徑

*大

*小

*大

*小

M1.0  0.25

0.75

0.785

0.729

M12  1.0

11

11.153

10.917

M1.1  0.25

0.85

0.885

0.829

M12  0.5

11.5

11.52

11.4

M1.2  0.25

0.95

0.985

0.929

M14  1.5

12.5

12.676

12.376

M1.4  0.3

1.1

1.142

1.075

M14  1.0

13

13.153

12.917

M1.6  0.35

1.25

1.321

1.221

M15  1.5

13.5

13.676

13.376

M1.7  0.35

1.35

1.421

1.321

M15  1.0

14

14.153

13.917

M1.8  0.35

1.45

1.521

1.421

M16  1.5

14.5

14.676

14.376

M2.0  0.4

1.6

1.679

1.567

M16  1.0

15

15.153

14.917

M2.2  0.45

1.75

1.838

1.713

M17  1.5

15.5

15.676

15.376

M2.3  0.4

1.9

1.979

1.867

M17  1.0

16

16.153

15.917

M2.5  0.45

2.1

2.138

2.013

M18  2.0

16

16.21

15.835

M2.6  0.45

2.2

2.238

2.113

M18  1.5

16.5

16.676

16.376

M3.0  0.5

2.5

2.599

2.459

M18  1.0

17

17.153

16.917

M3.5  0.6

2.9

3.01

2.85

M20  2.0

18

18.21

17.835

M4.0  0.7

3.3

3.422

3.242

M20  1.5

18.5

18.676

18.376

M4.5  0.75

3.8

3.878

3.688

M20  1.0

19

19.153

18.917

M5.0  0.8

4.2

4.334

4.134

M22  2.0

20

20.21

19.835

M6.0  1.0

5

5.153

4.917

M22  1.5

20.5

20.676

20.376

M7.0  1.0

6

6.153

5.917

M22  1.0

21

21.153

20.917

M8.0  1.25

6.8

6.912

6.647

M24  2.0

22

22.21

21.835

M9.0  1.25

7.8

7.912

7.647

M24  1.5

22.5

22.676

22.376

M10   1.5

8.5

8.676

8.376

M24  1.0

23

23.153

22.917

M11   1.5

9.5

9.676

9.376

M25  2.0

23

23.21

22.835

M12   1.75

10.3

10.441

10.106

M25  1.5

23.5

23.676

23.376

M14   2.0

12

12.21

11.835

M25  1.0

24

24.153

23.917

M16   2.0

14

14.21

13.835

M26  1.5

24.5

24.676

24.376

M18   2.5

15.5

15.744

15.294

M27  2.0

25

25.21

24.835

M20   2.5

17.5

17.744

17.294

M27  1.5

25.5

25.676

25.376

M22   2.5

19.5

19.744

19.294

M27  1.0

26

26.153

25.917

M24   3.0

21

21.252

20.752

M28  2.0

26

26.21

25.835

M27   3.0

24

24.252

23.752

M28  1.5

26.5

26.676

26.378

M30  3.5

26.5

26.771

26.211

M28  1.0

27

27.153

26.917

M33  3.5

29.5

29.771

29.211

M30  3.0

27

27.252

26.752

M36  4.0

32

32.27

31.67

M30  2.0

28

28.21

27.835

M39  4.0

35

35.27

34.67

M30  1.5

28.5

28.676

28.376

M30  1.0

29

29.153

28.917

公制細螺紋

M32  2.0

30

30.21

29.835

規格

標準徑

2級鉆孔徑

M32  1.5

30.5

30.676

30.376

*大

*小

M33  3.0

30

30.252

29.752

M1.0   0.2

0.8

0.821

0.783

M33  2.0

31

31.21

30.835

M1.1   0.2

0.9

0.921

0.883

M33  1.5

31.5

31.676

31.376

M1.2   0.2

1

1.021

0.983

M35  1.5

33.5

33.676

33.376

M1.4   0.2

1.2

1.221

1.183

M36  3.0

33

33.252

32.752

M1.6   0.2

1.4

1.421

1.383

M36  2.0

34

34.21

33.835

M1.7   0.2

1.45

1.5

1.46

M36  1.5

34.5

34.676

34.376

M1.8   0.2

1.6

1.621

1.583

M2.0   0.25

1.75

1.785

1.729

美制細螺紋

M2.2   0.25

1.95

1.985

1.929

規格（UNF)

標準徑

2級牙鉆孔徑

M2.3   0.25

2.05

2.061

2.001

*大

*小

M2.5   0.35

2.2

2.221

2.121

螺紋牙外徑

M2.6   0.35

2.2

2.246

2.186

N.o-80(1.524)

1.25

1.305

1.182

M3.0   0.35

2.7

2.721

2.621

No.1-72(1.854)

1.55

1.612

1.474

M3.5   0.35

3.2

3.221

3.121

No.2-64(2.184)

1.85

1.912

1.756

M4.0   0.5

3.5

3.599

3.459

No.3-56(2.515)

2.1

2.197

2.025

M4.5   0.5

4

4.099

3.959

No.4-48(2.845)

2.4

2.458

2.271

M5.0   0.5

4.5

4.599

4.459

No.5-44(3.175)

2.7

2.74

2.551

M5.5   0.5

5

5.099

4.959

No.6-40(3.505)

2.9

3.022

2.82

M6.0   0.75

5.3

5.378

5.188

No.8-36(4.166)

3.5

3.606

3.404

M6.0   0.5

5.5

5.55

5.4

No.10-32(4.826)

4.1

4.165

3.963

M7.0   0.75

6.3

6.378

6.188

No.12-28(5.486)

4.6

4.724

4.496

M7.0   0.5

6.5

6.55

6.4

1/4      - 28

5.5

5.588

5.36

M8.0   1.0

7

7.153

6.917

5/16     -24

6.9

7.035

6.782

M8.0   0.75

7.3

7.378

7.188

3/8      -24

8.5

8.635

8.382

M8.0   0.5

7.5

7.52

7.4

7/16     -20

9.9

10.033

9.729

M9.0   1.0

8

8.153

7.917

1/2      -20

11.5

11.607

11.329

M10    1.25

8.8

8.912

8.647

9/16    -18

12.9

13.081

12.751

M10    1.0

9

9.153

8.917

5/8      -18

14.5

14.681

14.351

M10    0.75

9.3

9.378

9.188

3/4      -16

17.5

17.678

17.323

M10    0.5

9.5

9.52

9.4

7/8      -14

20.5

20.675

20.27

M11    1.0

10

10.153

9.917

1        -12

23.3

23.571

23.114

M11    0.75

10.3

10.378

10.188

1-1/8    -12

26.5

26.746

26.289

M12    1.5

10.5

10.676

10.376

1-1/4    -12

29.6

29.921

29.464

M12    1.25

10.8

10.921

10.647

1-3/8    -12

32.8

33.096

32.639

1-1/2    -12

36

36.271

35814