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The M Thread - ISO 724:1993 "ISO general-purpose metric screw threads -- Basic dimensions" (DIN 13), the standard in Europe, is recognizable by
its cylindrical outer and inner diameter and its precise outer diameter in millimeters.
There are three kinds of ISO metric threads:
coarse
fine
extra fine
The thread angle is 60o. The thread depth is 0.614 x pitch.
Designation
Metric threads are designated with a capital M plus an indication to their nominal outer diameter and their pitch:
M size x pitch
For instance:
M10 x 1.5
Metric Threads - Coarse Thread Pitches
Size - Nominal Diameter
(mm)
Pitch1)
(mm)
Clearance Drill
(mm)
Tap Drill
(mm)
M 1.60
0.35
1.8
1.25
M 2.00
0.4
2.4
1.6
M 2.50
0.45
2.9
M 3.00
0.5
3.4
2.5
M 3.50
0.6
3.9
2.9
M 4.00
0.7
4.5
3.3
M 5.00
0.8
5.5
4.2
M 6.00
6.6
M 8.00
1.25
6.8
M 10.00
1.5
12
8.5
M 12.00
1.75
14
10.2
M 14.00
16
12
M 16.00
18
14
M 20.00
2.5
22
17.5
M 22.00
2.5
25
19.5
M 24.00
27
21
M 27.00
30
24
M 30.00
3.5
33
26.5
M 36.00
40
32
M 42.00
4.5
46
37.5
M 48.00
53
43
M 56.00
5.5
62
50.5
M 64.00
70
58
M 68.00
74
62
For metric threads pitch is the distance between threads.
1 mm ~= 0.03937 inches
1)
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Metric Threads - Fine Thread Pitches
M 1.0x0.2
Pitch1)
(mm)
0.2
Tap Drill
(mm)
0.8
M 45x3.0
M 1.1x0.2
0.2
0.9
M 45x4.0
41
M 1.2x0.2
0.2
M 48x1.5
1.5
46.5
M 1.4z0.2
0.2
1.2
M 48x2.0
46
M 1.6x0.2
0.2
1.4
M 48x3.0
45
M 1.8x0.2
0.2
1.6
M 48x4.0
44
M 2x0.25
0.25
1.75
M 50x1.5
1.5
48.5
48
Size
Size
Pitch1)
(mm)
3
Tap Drill
(mm)
42
M 2.2x0.25
0.25
1.95
M 50x2.0
M 2.5x0.35
0.35
2.1
M 50x3.0
47
M 3x0.35
0.35
2.6
M 52x1.5
1.5
50.5
M 3.5x0.35
0.35
3.1
M 52x2.0
50
M 4x0.5
0.5
3.5
M 52x3.0
49
M 4.5x0.5
0.5
M 52x4.0
48
M 5x0.5
0.5
4.5
M 55x1.5
1.5
53.5
M 5.5x0.5
0.5
M 55x2.0
53
M 6x0.75
0.75
5.2
M 55x3.0
52
M 7x0.75
0.75
6.2
M 55x4.0
51
M 8x0.75
0.75
7.2
M 56x1.5
1.5
54.5
M 8x1.0
M 56x2.0
54
M 9x0.75
0.75
8.2
M 56x3.0
53
M 9x 1
M 56x4.0
52
M 10x0.75
0.75
9.2
M 58x1.5
1.5
56.5
56
M 10x1
M 58x2.0
M 10x1.25
1.25
8.8
M 58x3.0
55
M 11x0.75
0.75
10.2
M 58x4.0
54
M 11x1
10
M 60x1.5
1.5
58.5
M 12x1
11
M 60x2.0
58
M 12x1.25
1.25
10.8
M 60x3.0
57
M 12x1.5
1.5
10.5
M 60x4.0
56
M 14x1.0
13
M 62x1.5
1.5
60.5
M 14x1.25
1.25
12.8
M 62x2.0
60
M 14x1.5
1.5
12.5
M 62x3.0
59
M 15x1
14
M 62x4.0
58
M 15x1.5
1.5
13.5
M 64x1.5
1.5
62.5
M 16x1
15
M 64x2.0
62
M 16x1.5
1.5
14.5
M 64x3.0
61
M 17x1.0
16
M 64x4.0
60
M 17x1.5
1.5
15.5
M 65x1.5
1.5
63.5
M 18x1.0
17
M 65x2.0
63
M 18x1.5
1.5
16.5
M 65x3.0
62
M 18x2.0
16
M 65x4.0
61
M 20x1.0
19
M 68x1.5
1.5
66.5
M 20x1.5
1.5
18.5
M 68x2.0
66
M 20x2.0
18
M 68x3.0
65
M 22x1.0
21
M 68x4.0
64
M 22x1.5
1.5
20.5
M 70x1.5
1.5
68.5
M 22x2.0
20
M 70x2.0
68
M 24x1.0
23
M 70x3.0
67
M 24x1.5
1.5
22.5
M 70x4.0
66
M 24x2.0
22
M 70x6.0
64
M 25x1.0
24
M 72x1.5
1.5
70.5
M 25x1.5
1.5
23.5
M 72x2.0
70
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M 25x2.0
23
M 72x3.0
69
M 27x1.0
26
M 72x4.0
68
M 27x1.5
25.5
Tap Drill
(mm)
25
M 72x6.0
M 27x2.0
1.5
Pitch1)
(mm)
2
M 75x1.5
6
Pitch1)
(mm)
1.5
66
Tap Drill
(mm)
73.5
M 28x1.0
27
M 75x2.0
73
M 28x1.5
1.5
26.5
M 75x3.0
72
71
Size
Size
M 28x2.0
26
M 75x4.0
M 30x1.0
29
M 75x6.0
69
M 30x1.5
1.5
28.5
M 76x1.5
1.5
74.5
M 30x2.0
28
M 76x2.0
74
M 30x3.0
27
M 76x3.0
73
M 32x1.5
1.5
30.5
M 76x4.0
72
M 32x2.0
30
M 76x6.0
70
M 33x1.5
1.5
31.5
M 80x1.5
1.5
78.5
M 33x2.0
31
M 80x2.0
78
M 33x3.0
30
M 80x3.0
77
M 35x1.5
1.5
33.5
M 80x4.0
76
M 35x2.0
33
M 80x6.0
74
M 36x1.5
1.5
34.5
M 85x2.0
83
M 36x2.0
34
M 85x3.0
82
M 36x3.0
33
M 85x4.0
81
M 39x1.5
1.5
37.5
M 85x6.0
79
M 39x2.0
37
M 90x2.0
88
M 39x3.0
36
M 90x3.0
87
M 40x1.5
1.5
38.5
M 90x4.0
86
M 40x2.0
38
M 90x6.0
84
M 40x3.0
37
M 95x2.0
93
M 42x1.5
1.5
40.5
M 95x3.0
92
M 42x2.0
40
M 95x4.0
91
M 42x3.0
39
M 95x6.0
89
M 42x4.0
38
M 100x2.0
98
M 45x1.5
1.5
43.5
M 100x3.0
97
M 45x2.0
43
M 100x4.0
96
M 100x6.0
94
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