Dimensions mm · values as the standard states them Size P ds fit h9 dk k b r n f l M1.4 0.3 2
1.975 – 2
3.5
3.32 – 3.5
0.9
0.78 – 1.02
2.2
≤ 0.1
0.3
0.36 – 0.5
≈ 0.25
0.45 – 0.6
M1.6 0.35 2.5
2.475 – 2.5
4
3.82 – 4
1
0.88 – 1.12
2.5
≤ 0.1
0.4
0.46 – 0.6
≈ 0.25
0.5 – 0.7
M2 0.4 2.8
2.775 – 2.8
4.5
4.32 – 4.5
1.2
1.08 – 1.32
3
≤ 0.1
0.5
0.56 – 0.7
≈ 0.3
0.6 – 0.8
M2.5 0.45 3.5
3.47 – 3.5
6
5.82 – 6
1.5
1.38 – 1.62
3.5
≤ 0.1
0.6
0.66 – 0.8
≈ 0.4
0.75 – 0.95
M3 0.5 4
3.97 – 4
7
6.78 – 7
1.8
1.68 – 1.92
4.5
≤ 0.1
0.8
0.86 – 1
≈ 0.45
0.9 – 1.15
(M3.5) 0.6 4.5
4.47 – 4.5
7.5
7.28 – 7.5
2
1.88 – 2.12
5.5
≤ 0.1
0.8
0.86 – 1
≈ 0.5
1 – 1.3
M4 0.7 5.5
5.47 – 5.5
8.5
8.28 – 8.5
2.4
2.28 – 2.52
6
≤ 0.2
1
1.06 – 1.2
≈ 0.6
1.2 – 1.5
M5 0.8 7
6.964 – 7
11
10.73 – 11
2.7
2.58 – 2.82
7
≤ 0.2
1.2
1.26 – 1.51
≈ 0.7
1.3 – 1.6
M6 1 8
7.964 – 8
13
12.73 – 13
3.1
2.95 – 3.25
9
≤ 0.25
1.6
1.66 – 1.91
≈ 0.8
1.5 – 1.9
M8 1.25 10
9.964 – 10
16
15.73 – 16
3.8
3.65 – 3.95
11
≤ 0.4
2
2.06 – 2.31
≈ 0.9
1.9 – 2.4
M10 1.5 13
12.957 – 13
20
19.67 – 20
4.6
4.45 – 4.75
13.5
≤ 0.4
2.5
2.56 – 2.81
≈ 1.1
2.3 – 2.8
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.
Length tolerances 0.5 0.56 – 0.6
0.6 0.66 – 0.7
0.8 0.86 – 0.9
1 1.06 – 1.1
1.2 1.26 – 1.3
1.4 1.46 – 1.5
1.5 1.56 – 1.6
1.6 1.66 – 1.7
1.8 1.86 – 1.9
2 2.06 – 2.1
2.5 2.56 – 2.6
3 3.06 – 3.1
3.5 3.57 – 3.65
4 4.07 – 4.15
4.5 4.57 – 4.65
5 5.07 – 5.15
6 6.07 – 6.15
8 8.07 – 8.15
10 10.07 – 10.15
12 12.1 – 12.2
16 16.1 – 16.2
20 20.1 – 20.2
25 25.1 – 25.2
Size sheet · DIN 923
M1.4
ds shank diameter (fit h9) 2
dk head diameter 3.5
k head height 0.9
b thread length 2.2
r fillet radius ≤ 0.1
n groove width 0.3
f ≈ 0.25
l 0.45 – 0.6 Thread · ISO 261/262
Pitch P 0.3
d2 1.205
d3 1.032
Tap drill 1.1
Stress area As 0.98 mm² Standard lengths
0.5 · 0.6 · 0.8 · 1 · 1.2 · 1.4 · 1.5 · 1.6 · 1.8 · 2 · 2.5 · 3 · 3.5 · 4
Size sheet · DIN 923
M1.6
ds shank diameter (fit h9) 2.5
dk head diameter 4
k head height 1
b thread length 2.5
r fillet radius ≤ 0.1
n groove width 0.4
f ≈ 0.25
l 0.5 – 0.7 Thread · ISO 261/262
Pitch P 0.35
d2 1.373
d3 1.171
Tap drill 1.25
Stress area As 1.27 mm² Standard lengths
0.8 · 1 · 1.2 · 1.4 · 1.5 · 1.6 · 1.8 · 2 · 2.5 · 3 · 3.5 · 4 · 4.5 · 5
Size sheet · DIN 923
M2
ds shank diameter (fit h9) 2.8
dk head diameter 4.5
k head height 1.2
b thread length 3
r fillet radius ≤ 0.1
n groove width 0.5
f ≈ 0.3
l 0.6 – 0.8 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
1 · 1.2 · 1.4 · 1.5 · 1.6 · 1.8 · 2 · 2.5 · 3 · 3.5 · 4 · 4.5 · 5 · 6
Size sheet · DIN 923
M2.5
ds shank diameter (fit h9) 3.5
dk head diameter 6
k head height 1.5
b thread length 3.5
r fillet radius ≤ 0.1
n groove width 0.6
f ≈ 0.4
l 0.75 – 0.95 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
1.2 · 1.4 · 1.5 · 1.6 · 1.8 · 2 · 2.5 · 3 · 3.5 · 4 · 4.5 · 5 · 6 · 8
Size sheet · DIN 923
M3
ds shank diameter (fit h9) 4
dk head diameter 7
k head height 1.8
b thread length 4.5
r fillet radius ≤ 0.1
n groove width 0.8
f ≈ 0.45
l 0.9 – 1.15 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
1.4 · 1.5 · 1.6 · 1.8 · 2 · 2.5 · 3 · 3.5 · 4 · 4.5 · 5 · 6 · 8 · 10
Size sheet · DIN 923
M3.5
ds shank diameter (fit h9) 4.5
dk head diameter 7.5
k head height 2
b thread length 5.5
r fillet radius ≤ 0.1
n groove width 0.8
f ≈ 0.5
l 1 – 1.3 Thread · ISO 261/262
Pitch P 0.6
d2 3.11
d3 2.764
Tap drill 2.9
Stress area As 6.78 mm² Standard lengths
1.6 · 1.8 · 2 · 2.5 · 3 · 3.5 · 4 · 4.5 · 5 · 6 · 8 · 10
Size sheet · DIN 923
M4
ds shank diameter (fit h9) 5.5
dk head diameter 8.5
k head height 2.4
b thread length 6
r fillet radius ≤ 0.2
n groove width 1
f ≈ 0.6
l 1.2 – 1.5 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
2 · 2.5 · 3 · 3.5 · 4 · 4.5 · 5 · 6 · 8 · 10 · 12
Size sheet · DIN 923
M5
ds shank diameter (fit h9) 7
dk head diameter 11
k head height 2.7
b thread length 7
r fillet radius ≤ 0.2
n groove width 1.2
f ≈ 0.7
l 1.3 – 1.6 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
2.5 · 3 · 3.5 · 4 · 4.5 · 5 · 6 · 8 · 10 · 12 · 16
Size sheet · DIN 923
M6
ds shank diameter (fit h9) 8
dk head diameter 13
k head height 3.1
b thread length 9
r fillet radius ≤ 0.25
n groove width 1.6
f ≈ 0.8
l 1.5 – 1.9 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
3 · 3.5 · 4 · 4.5 · 5 · 6 · 8 · 10 · 12 · 16 · 20 · 25
Size sheet · DIN 923
M8
ds shank diameter (fit h9) 10
dk head diameter 16
k head height 3.8
b thread length 11
r fillet radius ≤ 0.4
n groove width 2
f ≈ 0.9
l 1.9 – 2.4 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
4 · 5 · 6 · 8 · 10 · 12 · 16 · 20 · 25
Size sheet · DIN 923
M10
ds shank diameter (fit h9) 13
dk head diameter 20
k head height 4.6
b thread length 13.5
r fillet radius ≤ 0.4
n groove width 2.5
f ≈ 1.1
l 2.3 – 2.8 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 16 · 20 · 25
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.
Data notes (1) M1.4 n: min/max labels swapped in the source table — corrected.