Dimensions mm · values as the standard states them Size P m k d2 recess_no recess H M3 0.5 3.1
2.4
6
1
M4 0.7 4.6
3.1
8
2
M5 0.8 5.3
3.8
10
2
M6 1 6.8
4.6
12
3
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 A
M3
m groove width 3.1
k head height 2.4
d2 6
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 A
M4
m groove width 4.6
k head height 3.1
d2 8
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 A
M5
m groove width 5.3
k head height 3.8
d2 10
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 A
M6
m groove width 6.8
k head height 4.6
d2 12
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 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.