Dimensions mm · values as the standard states them Size P d1 h d2 M3 0.5 0.55
0.6
4.5
M4 0.7 0.55
0.6
5.5
M5 0.8 0.8
0.7
6.5
M6 1 0.8
0.8
7.8
M8 1.25 0.5
1
9
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 32501
M3
d1 the diameter of the stud 0.55
h height washers 0.6
d2 head diameter 4.5 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 32501
M4
d1 the diameter of the stud 0.55
h height washers 0.6
d2 head diameter 5.5 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Size sheet · DIN 32501
M5
d1 the diameter of the stud 0.8
h height washers 0.7
d2 head diameter 6.5 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 32501
M6
d1 the diameter of the stud 0.8
h height washers 0.8
d2 head diameter 7.8 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 32501
M8
d1 the diameter of the stud 0.5
h height washers 1
d2 head diameter 9 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Data notes (1) Status (active/withdrawn) could not be confirmed from the sources used.