螺纹规格d×p

安装后螺套的直径倍数k×d

钢丝螺套安装后长度L(mm)

钻头直径（底孔尺寸）do(mm)

安装前的螺套孔径(mm)

自由状态螺套

圈数N(≈)

M2×0.4

1D
1.5D
2D

2
3
4

2.1

2.6-2.8

3.2
5.3
7.4

M2.5×0.45

1D
1.5D
2D

2.5
3.75
5

2.6

3.3-3.5

3.6
5.9
8.2

M3×0.5

1D
1.5D
2D

3
4.5
6

3.1

3.8-4.0

4.2
6.8
9.4

M4×0.7

1D
1.5D
2D

4
6
8

4.2

5.15-5.35

4
6.6
9.1

M5×0.8

1D
1.5D
2D

5
7.5
10

5.2

6.35-6.6

4.4
7.1
9.9

M6×1

1D
1.5D
2D

6
9
12

6.3

7.6-7.85

4.3
6.9
9.6

M7×1

1D
1.5D
2D

7
10.5
14

7.3

8.65-8.9

5.2
8.3
11.5

M8×1.25

1D
1.5D
2D

8
12
16

8.3

9.85-10.1

4.8
7.7
10.6

M10×1.5

1D
1.5D
2D

10
15
20

10.4

12.1-12.5

5
8.1
11.2

M12×1.75

1D
1.5D
2D

12
18
24

12.4

14.4-14.8

5.3
8.4
11.6

M14×2

1D
1.5D
2D

14
21
28

14.5

16.8-17.2

5.4
8.7
11.9

M16×2

1D
1.5D
2D

16
24
32

16.5

19.0-19.4

6.3
10
13.1

M18×2.5

1D
1.5D
2D

18
27
36

18.6

21.5-22.2

5.6
9.0
12.3

M20×2.5

1D
1.5D
2D

20
30
40

20.5

23.7-24.2

6.3
10
13.8

M22×2.5

1D
1.5D
2D

22
33
44

22.6

26.3-26.8

6.9
11
15

M24×3

1D
1.5D
2D

24
36
48

24.8

28.5-29.1

6.3

10

13.7