Dimensions mm · values as the standard states them Size P dk s k t M2 0.4 ≤ 3.98
≤ 1.56
≤ 2
≥ 1
M2.5 0.45 ≤ 4.68
≤ 2.06
≤ 2.5
≥ 1.1
M3 0.5 ≤ 5.68
≤ 2.58
≤ 3
≥ 1.3
M4 0.7 ≤ 7.22
≤ 3.08
≤ 4
≥ 2
M5 0.8 ≤ 8.72
≤ 4.095
≤ 5
≥ 2.5
M6 1 ≤ 10.22
≤ 5.14
≤ 6
≥ 3
M8 1.25 ≤ 13.27
≤ 6.4
≤ 8
≥ 4
M10 1.5 ≤ 16.27
≤ 8.175
≤ 10
≥ 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.
Size sheet · DIN 7500 E
M2
dk head diameter ≤ 3.98
s width across flats ≤ 1.56
k head height ≤ 2
t groove depth ≥ 1 Thread · ISO 261/262
Pitch P 0.4
d2 1.74
d3 1.509
Tap drill 1.6
Stress area As 2.07 mm² Size sheet · DIN 7500 E
M2.5
dk head diameter ≤ 4.68
s width across flats ≤ 2.06
k head height ≤ 2.5
t groove depth ≥ 1.1 Thread · ISO 261/262
Pitch P 0.45
d2 2.208
d3 1.948
Tap drill 2.05
Stress area As 3.39 mm² Size sheet · DIN 7500 E
M3
dk head diameter ≤ 5.68
s width across flats ≤ 2.58
k head height ≤ 3
t groove depth ≥ 1.3 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Size sheet · DIN 7500 E
M4
dk head diameter ≤ 7.22
s width across flats ≤ 3.08
k head height ≤ 4
t groove depth ≥ 2 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Size sheet · DIN 7500 E
M5
dk head diameter ≤ 8.72
s width across flats ≤ 4.095
k head height ≤ 5
t groove depth ≥ 2.5 Thread · ISO 261/262
Pitch P 0.8
d2 4.48
d3 4.019
Tap drill 4.2
Stress area As 14.18 mm² Size sheet · DIN 7500 E
M6
dk head diameter ≤ 10.22
s width across flats ≤ 5.14
k head height ≤ 6
t groove depth ≥ 3 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Size sheet · DIN 7500 E
M8
dk head diameter ≤ 13.27
s width across flats ≤ 6.4
k head height ≤ 8
t groove depth ≥ 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 Size sheet · DIN 7500 E
M10
dk head diameter ≤ 16.27
s width across flats ≤ 8.175
k head height ≤ 10
t groove depth ≥ 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 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Data notes (1) Status (active/withdrawn) could not be confirmed from the sources used.