Internal Threads, Class 6h Metric Chart
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1Internal
Nuts
METRIC
Threads
Min.
Pitch
Major
Line
Diameter
Minor
Diameter
Axis of internal thread
DIN 13; ISO 68
I
T
, C
6H
NTERNAL
HREADS
LASS
& ISO R 1501
Normal Engagement Length
Major Diameter
Pitch Diameter
Minor Diameter
Nominal Size
From
To
Min
Min
Max
Min
Max
M1.6
0.8
2.6
1.600
1.373
1.458
1.221
1.321
M2
1
3
2.000
1.740
1.830
1.567
1.679
M2.5
1.3
3.8
2.500
2.208
2.303
2.013
2.138
M3
1.5
4.5
3.000
2.675
2.775
2.459
2.599
M4
2
6
4.000
3.545
3.663
3.242
3.422
M5
2.5
7.5
5.000
4.480
4.605
4.134
4.334
M6
3
9
6.000
5.350
5.500
4.917
5.153
M8
4
12
8.000
7.188
7.348
6.647
6.912
M10
5
15
10.000
9.026
9.206
8.376
8.676
M12
6
18
12.000
10.863
11.063
10.106
10.441
M14
8
24
14.000
12.701
12.913
11.835
12.210
M16
8
24
16.000
14.701
14.913
13.835
14.210
M20
10
30
20.000
18.376
18.600
17.294
17.744
M24
12
36
24.000
22.051
22.316
20.752
21.252
M30
15
45
30.000
27.727
28.007
26.211
26.771
M36
18
53
36.000
33.402
33.702
31.670
32.270
M42
21
63
42.000
39.077
39.392
37.129
37.799
M48
24
71
48.000
44.752
45.087
42.587
43.297
M56
28
85
56.000
52.428
52.783
50.046
50.796
M64
32
95
64.000
60.103
60.478
57.505
58.305
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