Dimensions mm · values as the standard states them Size P m k d2 f recess_no recess H M2.5 0.45 2.8
≤ 1.5
4.7
0.6
1
M3 0.5 3.1
≤ 1.65
5.6
0.75
1
M4 0.7 4.5
≤ 2.2
7.5
1
2
M5 0.8 5.3
≤ 2.5
9.2
1.25
2
M6 1 6.8
≤ 3
11
1.5
3
M8 1.25 9
≤ 4
14.5
2
4
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 7516 E
M2.5
m groove width 2.8
k head height ≤ 1.5
d2 4.7
f 0.6
recess_no drive size (recess H) 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 7516 E
M3
m groove width 3.1
k head height ≤ 1.65
d2 5.6
f 0.75
recess_no drive size (recess H) 1 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 7516 E
M4
m groove width 4.5
k head height ≤ 2.2
d2 7.5
f 1
recess_no drive size (recess H) 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 7516 E
M5
m groove width 5.3
k head height ≤ 2.5
d2 9.2
f 1.25
recess_no drive size (recess H) 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 Size sheet · DIN 7516 E
M6
m groove width 6.8
k head height ≤ 3
d2 11
f 1.5
recess_no drive size (recess H) 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 7516 E
M8
m groove width 9
k head height ≤ 4
d2 14.5
f 2
recess_no drive size (recess H) 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 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.