Dimensions mm · values as the standard states them Size P ds dk e k c r a1 M1 0.25 —
5.5
5.26 – 5.74
—
1.5
1.25 – 1.5
edeschamfered
0.5
≤ 0.75
M1.2 0.25 —
6
5.76 – 6.24
—
1.5
1.25 – 1.5
edeschamfered
0.5
≤ 0.75
M1.4 0.3 —
7
6.71 – 7.29
—
2
1.75 – 2
edeschamfered
0.5
≤ 0.9
M1.6 0.35 —
7.5
7.21 – 7.79
—
2
1.75 – 2
edeschamfered
0.5
≤ 1.05
M2 0.4 2
1.86 – 2
9
8.71 – 9.29
1.5
2
1.75 – 2
edeschamfered
0.5
≤ 1.2
M2.5 0.45 2.5
2.36 – 2.5
11
10.65 – 11.35
2
2.5
2.25 – 2.5
0.3
0.5
≤ 1.35
M3 0.5 3
2.86 – 3
12
11.65 – 12.35
2
2.5
2.25 – 2.5
0.3
0.5
≤ 1.5
(M3.5) 0.6 3.5
3.32 – 3.5
14
13.65 – 14.35
2.5
3
2.75 – 3
0.4
0.5
≤ 1.8
M4 0.7 4
3.82 – 4
16
15.65 – 16.35
3
3.5
3.2 – 3.5
0.4
0.5
≤ 2.1
M5 0.8 5
4.82 – 5
20
19.58 – 20.42
3
4
3.7 – 4
0.4
1
≤ 2.4
M6 1 6
5.82 – 6
24
23.58 – 24.42
4
5
4.7 – 5
0.5
1
≤ 3
M8 1.25 8
7.78 – 8
30
29.58 – 30.42
5
6
5.7 – 6
0.6
2
≤ 3.75
M10 1.5 10
9.78 – 10
36
35.5 – 36.5
6
8
7.64 – 8
0.8
2
≤ 4.5
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.
Length tolerances 2 1.9 – 2.1
3 2.9 – 3.1
4 3.9 – 4.1
5 4.8 – 5.2
6 5.8 – 6.2
8 7.8 – 8.2
10 9.7 – 10.3
12 11.7 – 12.3
14 13.7 – 14.3
16 15.7 – 16.3
18 17.7 – 18.3
20 19.6 – 20.4
22 21.6 – 22.4
25 24.6 – 25.6
28 27.6 – 28.4
30 29.6 – 30.4
32 31.5 – 32.5
35 34.5 – 35.5
38 37.5 – 38.5
40 39.5 – 40.5
Size sheet · DIN 653
M1
dk head diameter 5.5
k head height 1.5
c edeschamfered
r fillet radius 0.5
a1 ≤ 0.75 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
2 · 3 · 4 · 5 · 6
Size sheet · DIN 653
M1.2
dk head diameter 6
k head height 1.5
c edeschamfered
r fillet radius 0.5
a1 ≤ 0.75 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
2 · 3 · 4 · 5 · 6 · 8
Size sheet · DIN 653
M1.4
dk head diameter 7
k head height 2
c edeschamfered
r fillet radius 0.5
a1 ≤ 0.9 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
3 · 4 · 5 · 6 · 8 · 10
Size sheet · DIN 653
M1.6
dk head diameter 7.5
k head height 2
c edeschamfered
r fillet radius 0.5
a1 ≤ 1.05 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
3 · 4 · 5 · 6 · 8 · 10 · 12
Size sheet · DIN 653
M2
ds shank diameter 2
dk head diameter 9
e width across corners 1.5
k head height 2
c edeschamfered
r fillet radius 0.5
a1 ≤ 1.2 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
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16
Size sheet · DIN 653
M2.5
ds shank diameter 2.5
dk head diameter 11
e width across corners 2
k head height 2.5
c 0.3
r fillet radius 0.5
a1 ≤ 1.35 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
Size sheet · DIN 653
M3
ds shank diameter 3
dk head diameter 12
e width across corners 2
k head height 2.5
c 0.3
r fillet radius 0.5
a1 ≤ 1.5 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
6 · 8 · 10 · 12 · 14 · 16 · 18 · 20
Size sheet · DIN 653
M3.5
ds shank diameter 3.5
dk head diameter 14
e width across corners 2.5
k head height 3
c 0.4
r fillet radius 0.5
a1 ≤ 1.8 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
6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22
Size sheet · DIN 653
M4
ds shank diameter 4
dk head diameter 16
e width across corners 3
k head height 3.5
c 0.4
r fillet radius 0.5
a1 ≤ 2.1 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
8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25
Size sheet · DIN 653
M5
ds shank diameter 5
dk head diameter 20
e width across corners 3
k head height 4
c 0.4
r fillet radius 1
a1 ≤ 2.4 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
10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30
Size sheet · DIN 653
M6
ds shank diameter 6
dk head diameter 24
e width across corners 4
k head height 5
c 0.5
r fillet radius 1
a1 ≤ 3 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30
Size sheet · DIN 653
M8
ds shank diameter 8
dk head diameter 30
e width across corners 5
k head height 6
c 0.6
r fillet radius 2
a1 ≤ 3.75 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
16 · 18 · 20 · 22 · 25 · 28 · 30 · 32 · 35
Size sheet · DIN 653
M10
ds shank diameter 10
dk head diameter 36
e width across corners 6
k head height 8
c 0.8
r fillet radius 2
a1 ≤ 4.5 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
20 · 22 · 25 · 28 · 30 · 32 · 35 · 38 · 40
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.