Dimensions mm · values as the standard states them Size P e m h D M3 0.5 17.6
2.9
8.6
8
M4 0.7 17.6
2.9
8.6
8
M5 0.8 22.5
4.1
11
10.3
M6 1 27.8
5.1
13.6
12.7
M8 1.25 30.3
5.6
14.8
13.8
M10 1.5 36.2
6.8
17.7
16.5
M12 1.75 49.4
9
24.1
22.5
M14 2 58.3
10.7
28.5
26.6
M16 2 58.3
10.7
28.5
26.6
M18 2.5 68.5
13.5
33.8
29.5
M20 2.5 68.5
13.5
33.8
29.5
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 315 A
M3
e width across corners 17.6
m nut height 2.9
h height of the nut 8.6
D 8 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 315 A
M4
e width across corners 17.6
m nut height 2.9
h height of the nut 8.6
D 8 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 315 A
M5
e width across corners 22.5
m nut height 4.1
h height of the nut 11
D 10.3 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 315 A
M6
e width across corners 27.8
m nut height 5.1
h height of the nut 13.6
D 12.7 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 315 A
M8
e width across corners 30.3
m nut height 5.6
h height of the nut 14.8
D 13.8 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 315 A
M10
e width across corners 36.2
m nut height 6.8
h height of the nut 17.7
D 16.5 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 315 A
M12
e width across corners 49.4
m nut height 9
h height of the nut 24.1
D 22.5 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 315 A
M14
e width across corners 58.3
m nut height 10.7
h height of the nut 28.5
D 26.6 Thread · ISO 261/262
Pitch P 2
d2 12.701
d3 11.546
Tap drill 12
Stress area As 115.44 mm² Size sheet · DIN 315 A
M16
e width across corners 58.3
m nut height 10.7
h height of the nut 28.5
D 26.6 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 315 A
M18
e width across corners 68.5
m nut height 13.5
h height of the nut 33.8
D 29.5 Thread · ISO 261/262
Pitch P 2.5
d2 16.376
d3 14.933
Tap drill 15.5
Stress area As 192.47 mm² Size sheet · DIN 315 A
M20
e width across corners 68.5
m nut height 13.5
h height of the nut 33.8
D 29.5 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 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.