QJ 2920 - 1997 MJ内螺纹攻丝前底孔直径

螺纹标记

MJ内螺纹攻丝前底孔直径 D' (mm)

推荐钻头直径

ds (mm)

基本尺寸

极限偏差

MJ1.6×0.2-4H6H

1.41

+0.05

1.4

MJ1.6×0.35-4H6H

1.27

+0.09

1.3¹⁾

MJ1.8×0.2-4H6H

1.61

+0.05

1.6

MJ1.8×0.35-4H6H

1.47

+0.09

1.5¹⁾

MJ2×0.25-4H6H

1.77

+0.06

1.8¹⁾

MJ2×0.4-4H6H

1.63

+0.09

1.65

MJ2.2×0.25-4H6H

1.97

+0.06

2¹⁾

MJ2.2×0.45-4H6H

1.78

+0.11

1.8¹⁾

MJ2.5×0.35-4H6H

2.17

+0.09

2.2¹⁾

MJ2.5×0.45-4H6H

2.08

+0.11

2.1¹⁾

MJ3×0.35-4H6H

2.67

+0.09

2.7¹⁾

MJ3×0.5-4H6H

2.53

+0.12

2.55

MJ3.5×0.35-4H6H

3.17

+0.09

3.2¹⁾

MJ3.5×0.6-4H6H

2.94

+0.14

3¹⁾

MJ4×0.5-4H6H

3.53

+0.12

3.6¹⁾

MJ4×0.7-4H6H

3.35

+0.15

3.4¹⁾

MJ4.5×0.5-4H6H

4.03

+0.12

4.1¹⁾

MJ4.5×0.75-4H6H

3.8

+0.16

3.8¹⁾

MJ5×0.5-4H6H

4.53

+0.12

4.5¹⁾

MJ5×0.8-4H6H

4.26

+0.16

4.3¹⁾

MJ5.5×0.5-4H5H

5.03

+0.1

5¹⁾

MJ6×0.75-4H5H

5.3

+0.12

5.3¹⁾

MJ6×1-4H5H

5.07

+0.15

5.1¹⁾

MJ7×0.75-4H5H

6.3

+0.12

6.3¹⁾

MJ7×1-4H5H

6.07

+0.15

6.1¹⁾

MJ8×0.75-4H5H

7.3

+0.12

7.3¹⁾

MJ8×1-4H5H

7.07

+0.15

7.1¹⁾

MJ8×1.25-4H5H

6.84

+0.15

6.9¹⁾

MJ9×0.75-4H5H

8.3

+0.12

8.3

MJ9×1-4H5H

8.07

+0.12

8.1¹⁾

MJ9×1.25-4H5H

7.84

+0.15

7.9¹⁾

MJ10×0.75-4H5H

9.3

+0.12

9.3

MJ10×1-4H5H

9.07

+0.15

9.1¹⁾

MJ10×1.25-4H5H

8.84

+0.15

8.9¹⁾

MJ10×1.5-4H5H

8.6

+0.18

8.6

MJ11×0.75-4H5H

10.3

+0.12

10.3

MJ11×1-4H5H

10.07

+0.15

10.1¹⁾

MJ11×1.25-4H5H

9.84

+0.15

9.9¹⁾

MJ11×1.5-4H5H

9.6

+0.18

9.6

MJ12×1-4H5H

11.07

+0.15

11.1¹⁾

MJ12×1.25-4H5H

10.84

+0.15

10.9¹⁾

MJ12×1.5-4H5H

10.6

+0.18

10.6

MJ12×1.75-4H5H

10.36

+0.2

10.4¹⁾

MJ14×1-4H5H

13.07

+0.15

13.1¹⁾

MJ14×1.25-4H5H

12.84

+0.15

12.9¹⁾

MJ14×1.5-4H5H

12.6

+0.18

12.6

MJ14×2-4H5H

12.12

+0.23

12.2

MJ15×1-4H5H

14.07

+0.15

14.1

MJ15×1.5-4H5H

13.6

+0.18

13.6

MJ16×1-4H5H

15.07

+0.15

15.1

MJ16×1.5-4H5H

14.6

+0.18

14.6

MJ16×2-4H5H

14.12

+0.23

14.2

MJ17×1-4H5H

16.07

+0.15

16.1

MJ17×1.5-4H5H

15.6

+0.18

15.6

MJ18×1-4H5H

17.07

+0.15

17.1

MJ18×1.5-4H5H

16.6

+0.18

16.6

MJ18×2-4H5H

16.12

+0.23

16.1

MJ18×2.5-4H5H

15.64

+0.28

15.7

MJ20×1-4H5H

19.07

+0.15

19.1

MJ20×1.5-4H5H

18.6

+0.18

18.6

MJ20×2-4H5H

18.12

+0.23

18.2

MJ20×2.5-4H5H

17.64

+0.28

17.7

MJ22×1-4H5H

21.07

+0.15

21.1

MJ22×1.5-4H5H

20.6

+0.18

20.6

MJ22×2-4H5H

20.12

+0.23

20.2

MJ22×2.5-4H5H

19.64

+0.28

19.7

MJ24×1-4H5H

23.07

+0.15

23.1

MJ24×1.5-4H5H

22.6

+0.18

22.6

MJ24×2-4H5H

22.12

+0.23

22.2

MJ24×3-4H5H

21.16

+0.32

21.2

MJ25×1-4H5H

24.07

+0.15

24.1

MJ25×1.5-4H5H

23.6

+0.18

23.6

MJ25×2-4H5H

23.12

+0.23

23.2

MJ26×1.5-4H5H

24.6

+0.18

24.6

MJ27×1-4H5H

26.07

+0.15

26.1

MJ27×1.5-4H5H

25.6

+0.18

25.6

MJ27×2-4H5H

25.12

+0.23

25.2

MJ27×3-4H5H

24.16

+0.32

24.2

MJ28×1-4H5H

27.07

+0.15

27.1

MJ28×1.5-4H5H

26.6

+0.18

26.6

MJ28×2-4H5H

26.12

+0.23

26.6

MJ30×1-4H5H

29.07

+0.15

29.1

MJ30×1.5-4H5H

28.6

+0.18

28.6

MJ30×2-4H5H

28.12

+0.23

28.2

MJ30×3-4H5H

27.16

+0.23

27.2

MJ30×3.5-4H5H

26.67

+0.37

26.7

MJ32×1.5-4H5H

30.6

+0.18

30.6

MJ32×2-4H5H

30.12

+0.23

30.2

MJ33×1.5-4H5H

31.6

+0.18

31.6

MJ33×2-4H5H

31.12

+0.23

31.2

MJ33×3-4H5H

30.16

+0.32

30.2

MJ33×3.5-4H5H

29.67

+0.37

39.7

MJ35×1.5-4H5H

33.6

+0.18

33.6

MJ35×2-4H5H

33.12

+0.23

33.2

MJ36×1.5-4H5H

34.6

+0.18

34.6

MJ36×2-4H5H

34.12

+0.23

34.2

MJ36×3-4H5H

33.16

+0.32

33.2

MJ36×4-4H5H

32.19

+0.39

32.2

MJ38×1.5-4H5H

36.6

+0.18

36.6

MJ39×1.5-4H5H

37.6

+0.18

37.6

MJ39×2-4H5H

37.12

+0.23

37.2

MJ39×3-4H5H

36.16

+0.32

36.2

MJ39×4-4H5H

35.19

+0.39

35.2

MJ40×1.5-4H5H

38.6

+0.18

38.6

MJ40×2-4H5H

38.12

+0.23

38.2

MJ40×3-4H5H

37.16

+0.32

37.2

MJ42×1.5-4H5H

40.6

+0.18

40.6

MJ42×2-4H5H

40.12

+0.23

40.2

MJ42×3-4H5H

39.16

+0.32

39.2

MJ42×4-4H5H

38.19

+0.39

38.2

MJ42×4.5-4H5H

37.71

+0.44

37.7

MJ45×1.5-4H5H

43.6

+0.18

43.6

MJ45×2-4H5H

43.12

+0.23

43.2

MJ45×3-4H5H

42.16

+0.32

42.2

MJ45×4-4H5H

41.19

+0.39

41.2

MJ45×4.5-4H5H

40.71

+0.44

40.7

MJ48×1.5-4H5H

46.6

+0.18

46.2

MJ48×2-4H5H

46.12

+0.23

46.1

MJ48×3-4H5H

45.16

+0.32

45.2

MJ48×4-4H5H

44.19

+0.39

44.2

MJ48×5-4H5H

43.23

+0.46

43.3

MJ50×1.5-4H5H

48.6

+0.18

48.6

MJ50×2-4H5H

48.12

+0.23

48.2

MJ50×3-4H5H

47.16

+0.32

47.2

MJ52×1.5-4H5H

50.6

+0.18

50.6

MJ52×2-4H5H

50.12

+0.23

50.2

MJ52×3-4H5H

49.16

+0.32

49.2

MJ52×4-4H5H

48.19

+0.39

48.2

MJ52×5-4H5H

47.23

+0.46

47.3

  ① 推荐钻头直径数值仅供参考，必要时可用较大尺寸改善或采用专用钻头。

  ② 推荐钻头直径数值后带"1）"者为符合 GB 1435~1438-85钻头标准数值。