螺纹尺寸

鑽頭直徑

崁合度區分：中2級
下孔徑

崁合度區分：中2級
內螺紋小徑

最小直徑

最大直徑

M 1  × 0.25

0.75

0.78 (80%)

0.729

0.785

1.1 × 0.25

0.85

0.88 (80%)

0.829

0.885

1.2 × 0.25

0.95

0.98 (80%)

0.929

0.985

1.4 × 0.3

1.1

1.14 (80%)

1.075

1.142

1.6 × 0.35

1.25

1.32 (75%)

1.221

1.321

1.8 × 0.35

1.45

1.52 (75%)

1.421

1.521

2  × 0.4

1.6

1.65 (80%)

1.567

1.679

2.2 × 0.45

1.75

1.83 (75%)

1.713

1.838

2.5 × 0.45

2.1

2.13 (75%)

2.013

2.138

3  × 0.5

2.5

2.59 (75%)

2.459

2.599

3.5 × 0.6

2.9

3.01 (75%)

2.850

3.010

4  × 0.7

3.3

3.39 (80%)

3.242

3.422

4.5 × 0.75

3.8

3.85 (80%)

3.688

3.878

5  × 0.8

4.2

4.31 (80%)

4.134

4.334

6  × 1

5

5.13 (80%)

4.917

5.153

7  × 1

6

6.13 (80%)

5.917

6.153

8  × 1.25

6.8

6.85 (85%)

6.647

6.912

9  × 1.25

7.8

7.85 (85%)

7.647

7.912

10  × 1.5

8.5

8.62 (85%)

8.376

8.676

11  × 1.5

9.5

9.62 (85%)

9.376

9.676

12  × 1.75

10.3

10.40 (85%)

10.106

10.441

14  × 2

12

12.2  (85%)

11.835

12.210

16  × 2

14

14.2  (85%)

13.835

14.210

18  × 2.5

15.5

15.7  (85%)

15.294

15.744

20  × 2.5

17.5

17.7  (85%)

17.294

17.744

22  × 2.5

19.5

19.2  (85%)

19.294

19.744

24  × 3

21

21.2  (85%)

20.752

21.252

27  × 3

24

24.2  (85%)

23.752

24.252

30  × 3.5

26.5

26.6  (90%)

26.211

26.771

33  × 3.5

29.5

29.6  (90%)

29.211

29.771

36  × 4

32

32.1  (90%)

31.670

32.270

39 × 4

35

35.1  (90%)

34.670

35.270

42 × 4.5

37.5

37.6  (90%)

37.129

37.799

45 × 4.5

40.5

40.6  (90%)

40.129

40.799

48 × 5

43

43.1  (90%)

42.587

43.297