Dimensions mm · values as the standard states them Size P dk k r t n dp f z M1.4 0.3 2
1.86 – 2
0.9
0.78 – 1.02
≤ 0.1
0.45 – 0.6
0.25
0.31 – 0.45
0.8
0.775 – 0.8
≈ 0.25
≈ 0.2
M1.6 0.35 2.3
2.16 – 2.3
1
0.88 – 112
≤ 0.1
0.5 – 0.7
0.3
0.36 – 0.5
0.8
0.775 – 0.8
≈ 0.25
≈ 0.2
M2 0.4 2.8
2.66 – 2.8
1.2
1.08 – 1.32
≤ 0.1
0.75 – 0.95
0.3
0.36 – 0.5
1.2
1.175 – 1.2
≈ 0.3
≈ 0.35
M2.5 0.45 3.5
3.32 – 3.5
1.5
1.38 – 1.62
≤ 0.1
0.75 – 0.95
0.4
0.46 – 0.6
1.5
1.475 – 1.5
≈ 0.4
≈ 0.35
M3 0.5 4
3.82 – 4
1.8
≤ 0.1
0.9 – 1.15
0.5
0.56 – 0.7
2
1.975 – 2
≈ 0.45
≈ 0.4
M3.5 0.6 4.5
4.32 – 4.5
2
1.88 – 2.12
≤ 0.1
1 – 1.3
0.5
0.56 – 0.7
2.5
2.475 – 2.5
≈ 0.5
≈ 0.45
M4 0.7 5.5
5.32 – 5.5
2.4
2.28 – 2.52
≤ 0.2
1.2 – 1.5
0.6
0.66 – 0.8
2.8
2.775 – 2.8
≈ 0.6
≈ 0.5
M5 0.8 6.5
6.28 – 6.5
2.7
2.58 – 2.82
≤ 0.2
1.3 – 1.6
0.8
0.86 – 1
3.5
3.47 – 3.5
≈ 0.7
≈ 0.6
M6 1 8
7.78 – 8
3.1
2.95 – 3.25
≤ 0.25
1.5 – 1.9
1
1.06 – 1.2
4.5
4.47 – 4.5
≈ 0.8
≈ 0.7
M8 1.25 10
9.78 – 10
3.8
3.65 – 3.95
≤ 0.4
1.9 – 2.4
1.2
1.26 – 1.51
6
5.97 – 6
≈ 0.9
≈ 1
M10 1.5 13
12.73 – 13
4.6
4.45 – 4.75
≤ 0.4
2.3 – 2.8
1.6
1.66 – 1.91
7.5
7.464 – 7.5
≈ 1.1
≈ 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 2.5 2.4 – 2.6
3 2.9 – 3.1
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
16 15.7 – 16.3
20 19.6 – 20.4
Size sheet · DIN 922
M1.4
dk head diameter 2
k head height 0.9
r fillet radius ≤ 0.1
t groove depth 0.45 – 0.6
n groove width 0.25
dp the diameter of the stud (no more) 0.8
f ≈ 0.25
z ≈ 0.2 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
0.6 · 0.8 · 1 · 1.2 · 1.6 · 2 · 2.5
Size sheet · DIN 922
M1.6
dk head diameter 2.3
k head height 1
r fillet radius ≤ 0.1
t groove depth 0.5 – 0.7
n groove width 0.3
dp the diameter of the stud (no more) 0.8
f ≈ 0.25
z ≈ 0.2 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 · 1.6 · 2 · 2.5 · 3
Size sheet · DIN 922
M2
dk head diameter 2.8
k head height 1.2
r fillet radius ≤ 0.1
t groove depth 0.75 – 0.95
n groove width 0.3
dp the diameter of the stud (no more) 1.2
f ≈ 0.3
z ≈ 0.35 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 · 1.6 · 2 · 2.5 · 3 · 4
Size sheet · DIN 922
M2.5
dk head diameter 3.5
k head height 1.5
r fillet radius ≤ 0.1
t groove depth 0.75 – 0.95
n groove width 0.4
dp the diameter of the stud (no more) 1.5
f ≈ 0.4
z ≈ 0.35 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
1.2 · 1.6 · 2 · 2.5 · 3 · 4 · 5
Size sheet · DIN 922
M3
dk head diameter 4
k head height 1.8
r fillet radius ≤ 0.1
t groove depth 0.9 – 1.15
n groove width 0.5
dp the diameter of the stud (no more) 2
f ≈ 0.45
z ≈ 0.4 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
1.6 · 2 · 2.5 · 3 · 4 · 5 · 6
Size sheet · DIN 922
M3.5
dk head diameter 4.5
k head height 2
r fillet radius ≤ 0.1
t groove depth 1 – 1.3
n groove width 0.5
dp the diameter of the stud (no more) 2.5
f ≈ 0.5
z ≈ 0.45 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 · 2 · 2.5 · 3 · 4 · 5 · 6
Size sheet · DIN 922
M4
dk head diameter 5.5
k head height 2.4
r fillet radius ≤ 0.2
t groove depth 1.2 – 1.5
n groove width 0.6
dp the diameter of the stud (no more) 2.8
f ≈ 0.6
z ≈ 0.5 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 · 4 · 5 · 6 · 8
Size sheet · DIN 922
M5
dk head diameter 6.5
k head height 2.7
r fillet radius ≤ 0.2
t groove depth 1.3 – 1.6
n groove width 0.8
dp the diameter of the stud (no more) 3.5
f ≈ 0.7
z ≈ 0.6 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 · 4 · 5 · 6 · 8 · 10
Size sheet · DIN 922
M6
dk head diameter 8
k head height 3.1
r fillet radius ≤ 0.25
t groove depth 1.5 – 1.9
n groove width 1
dp the diameter of the stud (no more) 4.5
f ≈ 0.8
z ≈ 0.7 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 · 4 · 5 · 6 · 8 · 10 · 12
Size sheet · DIN 922
M8
dk head diameter 10
k head height 3.8
r fillet radius ≤ 0.4
t groove depth 1.9 – 2.4
n groove width 1.2
dp the diameter of the stud (no more) 6
f ≈ 0.9
z ≈ 1 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
Size sheet · DIN 922
M10
dk head diameter 13
k head height 4.6
r fillet radius ≤ 0.4
t groove depth 2.3 – 2.8
n groove width 1.6
dp the diameter of the stud (no more) 7.5
f ≈ 1.1
z ≈ 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
5 · 6 · 8 · 10 · 12 · 16 · 20
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) 1 value(s) omitted after consistency checks: M3 k: min 1.68 > max 0.92 in source — min/max omitted