Dimensions mm · values as the standard states them Size P d1 h a d2 M5 0.8 5.5
2
5.5
18
M6 1 6.6
2
6.6
22
M8 1.25 9
3
9
28
M10 1.5 11
3
11
34
M12 1.75 14
4
14
44
M16 2 18
5
18
56
M20 2.5 22
6
22
72
M22 2.5 24
6
24
80
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 440 V
M5
d1 inside diameter 5.5
h thickness 2
a side length 5.5
d2 outside diameter 18 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 440 V
M6
d1 inside diameter 6.6
h thickness 2
a side length 6.6
d2 outside diameter 22 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 440 V
M8
d1 inside diameter 9
h thickness 3
a side length 9
d2 outside diameter 28 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 440 V
M10
d1 inside diameter 11
h thickness 3
a side length 11
d2 outside diameter 34 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Size sheet · DIN 440 V
M12
d1 inside diameter 14
h thickness 4
a side length 14
d2 outside diameter 44 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Size sheet · DIN 440 V
M16
d1 inside diameter 18
h thickness 5
a side length 18
d2 outside diameter 56 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Size sheet · DIN 440 V
M20
d1 inside diameter 22
h thickness 6
a side length 22
d2 outside diameter 72 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² Size sheet · DIN 440 V
M22
d1 inside diameter 24
h thickness 6
a side length 24
d2 outside diameter 80 Thread · ISO 261/262
Pitch P 2.5
d2 20.376
d3 18.933
Tap drill 19.5
Stress area As 303.4 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 Otto Roth status Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (1) Sources disagree on the status: fasteners.eu lists it as current, the Otto Roth DIN→EN/ISO handbook lists it as withdrawn.