Dimensions mm · values as the standard states them Size P ds dk k b r t n f M1 0.25 1
0.86 – 1
1.6
1.46 – 1.6
0.7
0.58 – 0.82
full
+2P 0
≤ 0.4
0.35 – 0.5
0.2
0.26 – 0.4
≈ 0.2
M1.2 0.25 1.2
1.06 – 1.2
1.8
1.66 – 1.8
0.8
0.68 – 0.92
full
+2P 0
≤ 0.1
0.4 – 0.55
0.25
0.31 – 0.45
≈ 0.2
M1.4 0.3 1.4
1.26 – 1.4
2
1.86 – 2
0.9
0.78 – 1.02
full
+2P 0
≤ 0.1
0.45 – 0.6
0.25
0.31 – 0.45
≈ 0.25
M1.6 0.35 1.6
1.46 – 1.6
2.3
2.16 – 2.3
1
0.88 – 1.12
5
+2P 0
≤ 0.1
0.5 – 0.7
0.3
0.36 – 0.5
≈ 0.25
M2 0.4 2
1.86 – 2
2.8
2.66 – 2.8
1.2
1.08 – 1.32
6
+2P 0
≤ 0.1
0.6 – 0.8
0.3
0.36 – 0.5
≈ 0.3
M2.5 0.45 2.5
2.36 – 2.5
3.5
3.32 – 3.5
1.5
1.38 – 1.62
7.5
+2P 0
≤ 0.1
0.75 – 0.95
0.4
0.46 – 0.6
≈ 0.4
M3 0.5 3
2.86 – 3
4
3.82 – 4
1.8
1.68 – 1.92
9
+2P 0
≤ 0.1
0.9 – 1.15
0.5
0.56 – 0.7
≈ 0.45
(M3.5) 0.6 3.5
3.32 – 3.5
4.5
4.32 – 4.5
2
1.88 – 2.12
10
+2P 0
≤ 0.1
1 – 1.3
0.5
0.56 – 0.7
≈ 0.5
M4 0.7 4
3.82 – 4
5.5
5.32 – 5.5
2.4
2.28 – 2.52
12
+2P 0
≤ 0.2
1.2 – 1.5
0.6
0.66 – 0.8
≈ 0.6
M5 0.8 5
4.82 – 5
6.5
6.28 – 6.5
2.7
2.58 – 2.82
15
+2P 0
≤ 0.2
1.3 – 1.6
0.8
0.86 – 1
≈ 0.7
M6 1 6
5.8 – 6
8
7.78 – 8
3.1
2.95 – 3.25
18
+2P 0
≤ 0.25
1.5 – 1.9
1
1.06 – 1.2
≈ 0.8
M8 1.25 8
7.78 – 8
10
9.78 – 10
3.8
3.65 – 3.95
24
+2P 0
≤ 0.4
1.9 – 2.4
1.2
1.26 – 1.51
≈ 0.9
M10 1.5 10
9.78 – 10
13
12.73 – 13
4.6
4.45 – 4.75
30
+2P 0
≤ 0.4
2.3 – 2.8
1.6
1.66 – 1.91
≈ 1.1
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 1.5 1.4 – 1.6
2 1.9 – 2.1
2.5 2.4 – 2.6
3 2.9 – 3.1
3.5 3.3 – 3.7
4 3.8 – 4.2
5 4.8 – 5.2
6 5.8 – 6.2
8 7.8 – 8.2
10 9.8 – 10.2
12 11.7 – 12.3
14 13.7 – 14.3
16 15.7 – 16.3
18 17.7 – 18.3
20 19.7 – 20.3
22 21.7 – 22.3
25 24.7 – 25.3
28 27.7 – 28.3
30 29.7 – 30.3
35 34.6 – 35.4
Size sheet · DIN 920
M1
ds shank diameter 1
dk head diameter 1.6
k head height 0.7
b thread length full
r fillet radius ≤ 0.4
t groove depth 0.35 – 0.5
n groove width 0.2
f ≈ 0.2 Thread · ISO 261/262
Pitch P 0.25
d2 0.838
d3 0.693
Tap drill 0.75
Stress area As 0.46 mm² Standard lengths
1.5 · 2 · 2.5 · 3 · 3.5 · 4
Size sheet · DIN 920
M1.2
ds shank diameter 1.2
dk head diameter 1.8
k head height 0.8
b thread length full
r fillet radius ≤ 0.1
t groove depth 0.4 – 0.55
n groove width 0.25
f ≈ 0.2 Thread · ISO 261/262
Pitch P 0.25
d2 1.038
d3 0.893
Tap drill 0.95
Stress area As 0.73 mm² Standard lengths
1.5 · 2 · 2.5 · 3 · 3.5 · 4 · 5
Size sheet · DIN 920
M1.4
ds shank diameter 1.4
dk head diameter 2
k head height 0.9
b thread length full
r fillet radius ≤ 0.1
t groove depth 0.45 – 0.6
n groove width 0.25
f ≈ 0.25 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
1.5 · 2 · 2.5 · 3 · 3.5 · 4 · 5
Size sheet · DIN 920
M1.6
ds shank diameter 1.6
dk head diameter 2.3
k head height 1
b thread length 5
r fillet radius ≤ 0.1
t groove depth 0.5 – 0.7
n groove width 0.3
f ≈ 0.25 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
2 · 2.5 · 3 · 3.5 · 4 · 5 · 6
Size sheet · DIN 920
M2
ds shank diameter 2
dk head diameter 2.8
k head height 1.2
b thread length 6
r fillet radius ≤ 0.1
t groove depth 0.6 – 0.8
n groove width 0.3
f ≈ 0.3 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
2 · 2.5 · 3 · 3.5 · 4 · 5 · 6
Size sheet · DIN 920
M2.5
ds shank diameter 2.5
dk head diameter 3.5
k head height 1.5
b thread length 7.5
r fillet radius ≤ 0.1
t groove depth 0.75 – 0.95
n groove width 0.4
f ≈ 0.4 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
2 · 2.5 · 3 · 3.5 · 4 · 5 · 6 · 8
Size sheet · DIN 920
M3
ds shank diameter 3
dk head diameter 4
k head height 1.8
b thread length 9
r fillet radius ≤ 0.1
t groove depth 0.9 – 1.15
n groove width 0.5
f ≈ 0.45 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
2.5 · 3 · 3.5 · 4 · 5 · 6 · 8 · 10
Size sheet · DIN 920
M3.5
ds shank diameter 3.5
dk head diameter 4.5
k head height 2
b thread length 10
r fillet radius ≤ 0.1
t groove depth 1 – 1.3
n groove width 0.5
f ≈ 0.5 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
3 · 3.5 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18
Size sheet · DIN 920
M4
ds shank diameter 4
dk head diameter 5.5
k head height 2.4
b thread length 12
r fillet radius ≤ 0.2
t groove depth 1.2 – 1.5
n groove width 0.6
f ≈ 0.6 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
3.5 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18
Size sheet · DIN 920
M5
ds shank diameter 5
dk head diameter 6.5
k head height 2.7
b thread length 15
r fillet radius ≤ 0.2
t groove depth 1.3 – 1.6
n groove width 0.8
f ≈ 0.7 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
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20
Size sheet · DIN 920
M6
ds shank diameter 6
dk head diameter 8
k head height 3.1
b thread length 18
r fillet radius ≤ 0.25
t groove depth 1.5 – 1.9
n groove width 1
f ≈ 0.8 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25
Size sheet · DIN 920
M8
ds shank diameter 8
dk head diameter 10
k head height 3.8
b thread length 24
r fillet radius ≤ 0.4
t groove depth 1.9 – 2.4
n groove width 1.2
f ≈ 0.9 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
6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30
Size sheet · DIN 920
M10
ds shank diameter 10
dk head diameter 13
k head height 4.6
b thread length 30
r fillet radius ≤ 0.4
t groove depth 2.3 – 2.8
n groove width 1.6
f ≈ 1.1 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
8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35
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.