Dimensions mm · values as the standard states them Size P d1 ds dk k b t n M2 0.4 1.2 – 1.34
1.85 – 2
3.68 – 3.8
2.7 – 3.3
16
0.7 – 0.9
0.56 – 0.7
M2.5 0.45 1.2 – 1.34
2.36 – 2.5
4.38 – 4.5
3.12 – 3.88
18
0.8 – 1
0.66 – 0.8
M3 0.5 1.5 – 1.64
2.86 – 3
5.38 – 5.5
3.62 – 4.38
19
1 – 1.25
0.86 – 1
M4 0.7 2 – 2.14
3.82 – 4
6.85 – 7
4.62 – 5.38
22
1.4 – 1.7
1.06 – 1.2
M5 0.8 2.5 – 2.64
4.82 – 5
8.35 – 8.5
6.05 – 6.95
25
1.7 – 2
1.26 – 1.51
M6 1 3 – 3.14
5.82 – 6
9.85 – 10
7.55 – 8.45
28
2.2 – 2.6
1.66 – 1.91
M8 1.25 4 – 4.18
7.78 – 8
12.82 – 13
9.55 – 10.45
34
2.7 – 3.2
2.06 – 2.31
M10 1.5 5 – 5.18
9.78 – 10
15.82 – 16
11.95 – 13.05
40
3.5 – 4.1
2.56 – 2.81
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 404
M2
d1 diameter premiums hole 1.2 – 1.34
ds shank diameter 1.85 – 2
dk head diameter 3.68 – 3.8
k head height 2.7 – 3.3
b thread length 16
t groove depth 0.7 – 0.9
n groove width 0.56 – 0.7 Thread · ISO 261/262
Pitch P 0.4
d2 1.74
d3 1.509
Tap drill 1.6
Stress area As 2.07 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 18
Size sheet · DIN 404
M2.5
d1 diameter premiums hole 1.2 – 1.34
ds shank diameter 2.36 – 2.5
dk head diameter 4.38 – 4.5
k head height 3.12 – 3.88
b thread length 18
t groove depth 0.8 – 1
n groove width 0.66 – 0.8 Thread · ISO 261/262
Pitch P 0.45
d2 2.208
d3 1.948
Tap drill 2.05
Stress area As 3.39 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25
Size sheet · DIN 404
M3
d1 diameter premiums hole 1.5 – 1.64
ds shank diameter 2.86 – 3
dk head diameter 5.38 – 5.5
k head height 3.62 – 4.38
b thread length 19
t groove depth 1 – 1.25
n groove width 0.86 – 1 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Standard lengths
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30
Size sheet · DIN 404
M4
d1 diameter premiums hole 2 – 2.14
ds shank diameter 3.82 – 4
dk head diameter 6.85 – 7
k head height 4.62 – 5.38
b thread length 22
t groove depth 1.4 – 1.7
n groove width 1.06 – 1.2 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40
Size sheet · DIN 404
M5
d1 diameter premiums hole 2.5 – 2.64
ds shank diameter 4.82 – 5
dk head diameter 8.35 – 8.5
k head height 6.05 – 6.95
b thread length 25
t groove depth 1.7 – 2
n groove width 1.26 – 1.51 Thread · ISO 261/262
Pitch P 0.8
d2 4.48
d3 4.019
Tap drill 4.2
Stress area As 14.18 mm² Standard lengths
6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50
Size sheet · DIN 404
M6
d1 diameter premiums hole 3 – 3.14
ds shank diameter 5.82 – 6
dk head diameter 9.85 – 10
k head height 7.55 – 8.45
b thread length 28
t groove depth 2.2 – 2.6
n groove width 1.66 – 1.91 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50
Size sheet · DIN 404
M8
d1 diameter premiums hole 4 – 4.18
ds shank diameter 7.78 – 8
dk head diameter 12.82 – 13
k head height 9.55 – 10.45
b thread length 34
t groove depth 2.7 – 3.2
n groove width 2.06 – 2.31 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Standard lengths
10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55
Size sheet · DIN 404
M10
d1 diameter premiums hole 5 – 5.18
ds shank diameter 9.78 – 10
dk head diameter 15.82 – 16
k head height 11.95 – 13.05
b thread length 40
t groove depth 3.5 – 4.1
n groove width 2.56 – 2.81 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Standard lengths
12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55
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.