Dimensions mm · values as the standard states them Size P dk m k M2 0.4 ≤ 4
0
≤ 1.6
M2.5 0.45 ≤ 5
1
≤ 2
M3 0.5 ≤ 6
1
≤ 2.4
M4 0.7 ≤ 8
2
≤ 3.1
M5 0.8 ≤ 10
2
≤ 3.8
M6 1 ≤ 12
3
≤ 4.6
M8 1.25 ≤ 16
4
≤ 6
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 C
M2
dk head diameter ≤ 4
m 0
k head height ≤ 1.6 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 C
M2.5
dk head diameter ≤ 5
m 1
k head height ≤ 2 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 C
M3
dk head diameter ≤ 6
m 1
k head height ≤ 2.4 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Size sheet · DIN 7500 C
M4
dk head diameter ≤ 8
m 2
k head height ≤ 3.1 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Size sheet · DIN 7500 C
M5
dk head diameter ≤ 10
m 2
k head height ≤ 3.8 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 C
M6
dk head diameter ≤ 12
m 3
k head height ≤ 4.6 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 C
M8
dk head diameter ≤ 16
m 4
k head height ≤ 6 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 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Data notes (1) Status (active/withdrawn) could not be confirmed from the sources used.