Dimensions mm · values as the standard states them Size P ds b1 b2 125 < l ≤ 200 b2 l > 200 b2 l ≤ 125 x M4 0.7 3.82 – 4
10
20
—
14
1.75
M5 0.8 4.82 – 5
12
22
—
16
2
M6 1 5.82 – 6
15
24
—
18
2.5
M7 1 6.78 – 7
18
26
—
20
2.5
M8 1.25 7.78 – 8
20
28
—
22
3.2
M10 1.5 9.78 – 10
25
32
45
26
3.8
M12 1.75 11.73 – 12
30
36
49
30
4.3
M14 2 13.73 – 14
35
40
53
34
5
M16 2 15.73 – 16
40
44
57
38
5
M18 2.5 17.73 – 18
45
48
61
42
6.3
M20 2.5 19.67 – 20
50
52
65
46
6.3
M22 2.5 21.67 – 22
55
56
69
50
6.3
M24 3 23.67 – 24
60
60
73
54
7.5
Ranges read min – max; ≤ / ≥ where the standard gives one limit, ≈ for approximate values. Sizes in (brackets) are non-preferred. Select a row for its size sheet.
Size sheet · DIN 940
M4
ds 3.82 – 4
b1 length of the thread (at least) 10
b2 length of the thread (at least) (125 < l ≤ 200) 20
b2 length of the thread (at least) (l ≤ 125) 14
x thread run 1.75 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Size sheet · DIN 940
M5
ds 4.82 – 5
b1 length of the thread (at least) 12
b2 length of the thread (at least) (125 < l ≤ 200) 22
b2 length of the thread (at least) (l ≤ 125) 16
x thread run 2 Thread · ISO 261/262
Pitch P 0.8
d2 4.48
d3 4.019
Tap drill 4.2
Stress area As 14.18 mm² Size sheet · DIN 940
M6
ds 5.82 – 6
b1 length of the thread (at least) 15
b2 length of the thread (at least) (125 < l ≤ 200) 24
b2 length of the thread (at least) (l ≤ 125) 18
x thread run 2.5 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Size sheet · DIN 940
M7
ds 6.78 – 7
b1 length of the thread (at least) 18
b2 length of the thread (at least) (125 < l ≤ 200) 26
b2 length of the thread (at least) (l ≤ 125) 20
x thread run 2.5 Thread · ISO 261/262
Pitch P 1
d2 6.35
d3 5.773
Tap drill 6
Stress area As 28.86 mm² Size sheet · DIN 940
M8
ds 7.78 – 8
b1 length of the thread (at least) 20
b2 length of the thread (at least) (125 < l ≤ 200) 28
b2 length of the thread (at least) (l ≤ 125) 22
x thread run 3.2 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Size sheet · DIN 940
M10
ds 9.78 – 10
b1 length of the thread (at least) 25
b2 length of the thread (at least) (125 < l ≤ 200) 32
b2 length of the thread (at least) (l > 200) 45
b2 length of the thread (at least) (l ≤ 125) 26
x thread run 3.8 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Size sheet · DIN 940
M12
ds 11.73 – 12
b1 length of the thread (at least) 30
b2 length of the thread (at least) (125 < l ≤ 200) 36
b2 length of the thread (at least) (l > 200) 49
b2 length of the thread (at least) (l ≤ 125) 30
x thread run 4.3 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Size sheet · DIN 940
M14
ds 13.73 – 14
b1 length of the thread (at least) 35
b2 length of the thread (at least) (125 < l ≤ 200) 40
b2 length of the thread (at least) (l > 200) 53
b2 length of the thread (at least) (l ≤ 125) 34
x thread run 5 Thread · ISO 261/262
Pitch P 2
d2 12.701
d3 11.546
Tap drill 12
Stress area As 115.44 mm² Size sheet · DIN 940
M16
ds 15.73 – 16
b1 length of the thread (at least) 40
b2 length of the thread (at least) (125 < l ≤ 200) 44
b2 length of the thread (at least) (l > 200) 57
b2 length of the thread (at least) (l ≤ 125) 38
x thread run 5 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Size sheet · DIN 940
M18
ds 17.73 – 18
b1 length of the thread (at least) 45
b2 length of the thread (at least) (125 < l ≤ 200) 48
b2 length of the thread (at least) (l > 200) 61
b2 length of the thread (at least) (l ≤ 125) 42
x thread run 6.3 Thread · ISO 261/262
Pitch P 2.5
d2 16.376
d3 14.933
Tap drill 15.5
Stress area As 192.47 mm² Size sheet · DIN 940
M20
ds 19.67 – 20
b1 length of the thread (at least) 50
b2 length of the thread (at least) (125 < l ≤ 200) 52
b2 length of the thread (at least) (l > 200) 65
b2 length of the thread (at least) (l ≤ 125) 46
x thread run 6.3 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² Size sheet · DIN 940
M22
ds 21.67 – 22
b1 length of the thread (at least) 55
b2 length of the thread (at least) (125 < l ≤ 200) 56
b2 length of the thread (at least) (l > 200) 69
b2 length of the thread (at least) (l ≤ 125) 50
x thread run 6.3 Thread · ISO 261/262
Pitch P 2.5
d2 20.376
d3 18.933
Tap drill 19.5
Stress area As 303.4 mm² Size sheet · DIN 940
M24
ds 23.67 – 24
b1 length of the thread (at least) 60
b2 length of the thread (at least) (125 < l ≤ 200) 60
b2 length of the thread (at least) (l > 200) 73
b2 length of the thread (at least) (l ≤ 125) 54
x thread run 7.5 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Provenance
Draft — values taken from a single source and not yet cross-checked.
fasteners.eu dimensions, lengths, materials, property classes, current norm, equivalent norms Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.