螺纹直径

螺距

钻孔直径

d

t

dz

1

0.25

0.75

2

0.4

1.6

3

0.5

2.5

4

0.7

3.3

5

0.8

4.2

6

1

5

8

1.25

6.7

10

1.5

8.5

12

1.75

10.2

14

2

11.9

16

2

13.9

18

2.5

15.4

20

2.5

17.4

22

2.5

19.4

24

3

20.9

27

3

23.9

30

3.5

26.3