MJ内螺纹攻丝前底孔直径 QJ 2920 - 1997
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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。