Dimensions mm · values as the standard states them Recess H Recess Z
Size P dk m m k b da c a r t t r1 recess_no recess_no x M3 0.5 7.5
6.92 – 7.5
3
2.9
2.35
2.1 – 2.35
≥ 25
≤ 3.6
0.6 – 0.8
≤ 1
≥ 0.1
1.35 – 1.8
1.58 – 1.83
≈ 3.8
1
1
≤ 1.25
(M3.5) 0.6 9
8.42 – 9
4.2
3.9
2.6
2.35 – 2.6
≥ 38
≤ 4.1
0.7 – 0.9
≤ 1.2
≥ 0.1
1.4 – 2.03
1.47 – 1.93
≈ 4.6
2
2
≤ 1.5
M4 0.7 10
9.42 – 10
4.6
4.3
3.05
2.75 – 3.05
≥ 38
≤ 4.7
0.9 – 1.1
≤ 1.4
≥ 0.2
1.8 – 2.46
1.88 – 2.34
≈ 5.8
2
2
≤ 1.75
M5 0.8 11.5
10.8 – 11.5
5
4.7
3.55
3.25 – 3.55
≥ 38
≤ 5.7
1.05 – 1.35
≤ 1.6
≥ 0.2
2.26 – 2.87
2.28 – 2.74
≈ 6.6
2
2
≤ 2
M6 1 14.5
13.8 – 14.5
7.1
5.7
4.55
4.25 – 4.55
≥ 38
≤ 6.8
1.4 – 1.8
≤ 2
≥ 0.25
3 – 3.66
3.02 – 3.48
≈ 0.82
3
3
≤ 2.5
M8 1.25 19
18.16 – 19
9
8.8
5.9
5.6 – 5.9
≥ 38
≤ 9.2
1.8 – 2.2
≤ 2.5
≥ 0.4
4.18 – 4.68
4.06 – 4.52
≈ 11
4
4
≤ 3.2
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 4 3.76 – 4.24
5 4.76 – 5.24
6 5.78 – 6.24
8 7.71 – 8.29
10 9.71 – 10.29
12 11.65 – 12.35
14 13.65 – 14.35
16 15.65 – 16.35
20 19.58 – 20.42
25 24.58 – 25.42
30 29.58 – 30.42
35 34.5 – 35.5
40 39.5 – 40.5
45 44.5 – 45.5
50 49.5 – 50.5
55 54.05 – 55.95
60 59.05 – 60.95
Size sheet · DIN 967
M3
dk head diameter 7.5
m groove width 3
m groove width 2.9
k head height 2.35
b thread length ≥ 25
da transition diameter ≤ 3.6
c thickness of the mounting collar 0.6 – 0.8
a length undercut ≤ 1
r fillet radius ≥ 0.1
t 1.35 – 1.8
t 1.58 – 1.83
r1 Head radius ≈ 3.8
recess_no drive size 1
recess_no drive size 1
x thread run ≤ 1.25 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 · 20 · 25 · 30
Size sheet · DIN 967
M3.5
dk head diameter 9
m groove width 4.2
m groove width 3.9
k head height 2.6
b thread length ≥ 38
da transition diameter ≤ 4.1
c thickness of the mounting collar 0.7 – 0.9
a length undercut ≤ 1.2
r fillet radius ≥ 0.1
t 1.4 – 2.03
t 1.47 – 1.93
r1 Head radius ≈ 4.6
recess_no drive size 2
recess_no drive size 2
x thread run ≤ 1.5 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
5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30 · 35
Size sheet · DIN 967
M4
dk head diameter 10
m groove width 4.6
m groove width 4.3
k head height 3.05
b thread length ≥ 38
da transition diameter ≤ 4.7
c thickness of the mounting collar 0.9 – 1.1
a length undercut ≤ 1.4
r fillet radius ≥ 0.2
t 1.8 – 2.46
t 1.88 – 2.34
r1 Head radius ≈ 5.8
recess_no drive size 2
recess_no drive size 2
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 Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30 · 35 · 40
Size sheet · DIN 967
M5
dk head diameter 11.5
m groove width 5
m groove width 4.7
k head height 3.55
b thread length ≥ 38
da transition diameter ≤ 5.7
c thickness of the mounting collar 1.05 – 1.35
a length undercut ≤ 1.6
r fillet radius ≥ 0.2
t 2.26 – 2.87
t 2.28 – 2.74
r1 Head radius ≈ 6.6
recess_no drive size 2
recess_no drive size 2
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 Standard lengths
6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30 · 35 · 40 · 45
Size sheet · DIN 967
M6
dk head diameter 14.5
m groove width 7.1
m groove width 5.7
k head height 4.55
b thread length ≥ 38
da transition diameter ≤ 6.8
c thickness of the mounting collar 1.4 – 1.8
a length undercut ≤ 2
r fillet radius ≥ 0.25
t 3 – 3.66
t 3.02 – 3.48
r1 Head radius ≈ 0.82
recess_no drive size 3
recess_no drive size 3
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 Standard lengths
8 · 10 · 12 · 14 · 16 · 20 · 25 · 30 · 35 · 40 · 45 · 50 · 55 · 60
Size sheet · DIN 967
M8
dk head diameter 19
m groove width 9
m groove width 8.8
k head height 5.9
b thread length ≥ 38
da transition diameter ≤ 9.2
c thickness of the mounting collar 1.8 – 2.2
a length undercut ≤ 2.5
r fillet radius ≥ 0.4
t 4.18 – 4.68
t 4.06 – 4.52
r1 Head radius ≈ 11
recess_no drive size 4
recess_no drive size 4
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 Standard lengths
10 · 12 · 14 · 16 · 20 · 25 · 30 · 35 · 40 · 45 · 50 · 55 · 60
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.