Dimensions mm · values as the standard states them Size P e m h d2 d3 g1 g2 r1 r2 r3 r4 M4 0.7 18 – 20
3.2 – 4.6
8.5 – 10.5
6 – 8
5.5 – 7
1.1 – 1.9
1.7 – 2.3
≈ 3
≈ Rounded
≈ 0.5
≈ 2
M5 0.8 24 – 26
4 – 6.5
11 – 13
8 – 11
7.5 – 9
1.5 – 2.3
2.3 – 2.8
≈ 4
—
≈ 1
≈ 2.5
M6 1 30 – 33
5 – 8
15 – 17
10 – 13
9 – 11
1.5 – 2.3
2.7 – 3.3
≈ 5
—
≈ 1
≈ 3
M8 1.25 36 – 39
6.5 – 10
18 – 20
13 – 16
10.5 – 12.5
2 – 2.8
3.6 – 4.4
≈ 6
—
≈ 1
≈ 3
M10 1.5 48 – 51
8 – 12
23 – 25
17 – 20
14.5 – 16.5
3.6 – 4.4
4.6 – 5.4
≈ 8
≈ 1
≈ 1.2
≈ 5
M12 1.75 62 – 65
10 – 14
31 – 33.5
20 – 23
17.5 – 19.5
4.1 – 4.9
5.6 – 6.4
≈ 10
≈ 1
≈ 1.2
≈ 6
M16 2 70 – 73
13 – 17
35 – 37.5
26 – 29
21 – 23
5.6 – 6.4
6.5 – 7.5
≈ 11
≈ 1.2
≈ 1.6
≈ 7
M20 2.5 86 – 90
16 – 21
44 – 46.5
32 – 35
27 – 29
6.1 – 6.9
7 – 8
≈ 14
≈ 1.6
≈ 2
≈ 8
M24 3 106 – 110
20 – 25
53.5 – 56.5
41 – 44
35 – 37.5
8.6 – 9.4
9.5 – 10.5
≈ 18
≈ 2.5
≈ 2.5
≈ 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 315 D
M4
e width across corners 18 – 20
m nut height 3.2 – 4.6
h height of the nut 8.5 – 10.5
d2 external diameter of the nut 6 – 8
d3 diameter of the collar 5.5 – 7
g1 width of the nut wing 1.1 – 1.9
g2 width of the nut wing 1.7 – 2.3
r1 radius ≈ 3
r2 radius ≈ Rounded
r3 radius ≈ 0.5
r4 radius ≈ 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 315 D
M5
e width across corners 24 – 26
m nut height 4 – 6.5
h height of the nut 11 – 13
d2 external diameter of the nut 8 – 11
d3 diameter of the collar 7.5 – 9
g1 width of the nut wing 1.5 – 2.3
g2 width of the nut wing 2.3 – 2.8
r1 radius ≈ 4
r3 radius ≈ 1
r4 radius ≈ 2.5 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 315 D
M6
e width across corners 30 – 33
m nut height 5 – 8
h height of the nut 15 – 17
d2 external diameter of the nut 10 – 13
d3 diameter of the collar 9 – 11
g1 width of the nut wing 1.5 – 2.3
g2 width of the nut wing 2.7 – 3.3
r1 radius ≈ 5
r3 radius ≈ 1
r4 radius ≈ 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 315 D
M8
e width across corners 36 – 39
m nut height 6.5 – 10
h height of the nut 18 – 20
d2 external diameter of the nut 13 – 16
d3 diameter of the collar 10.5 – 12.5
g1 width of the nut wing 2 – 2.8
g2 width of the nut wing 3.6 – 4.4
r1 radius ≈ 6
r3 radius ≈ 1
r4 radius ≈ 3 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 D
M10
e width across corners 48 – 51
m nut height 8 – 12
h height of the nut 23 – 25
d2 external diameter of the nut 17 – 20
d3 diameter of the collar 14.5 – 16.5
g1 width of the nut wing 3.6 – 4.4
g2 width of the nut wing 4.6 – 5.4
r1 radius ≈ 8
r2 radius ≈ 1
r3 radius ≈ 1.2
r4 radius ≈ 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 D
M12
e width across corners 62 – 65
m nut height 10 – 14
h height of the nut 31 – 33.5
d2 external diameter of the nut 20 – 23
d3 diameter of the collar 17.5 – 19.5
g1 width of the nut wing 4.1 – 4.9
g2 width of the nut wing 5.6 – 6.4
r1 radius ≈ 10
r2 radius ≈ 1
r3 radius ≈ 1.2
r4 radius ≈ 6 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 D
M16
e width across corners 70 – 73
m nut height 13 – 17
h height of the nut 35 – 37.5
d2 external diameter of the nut 26 – 29
d3 diameter of the collar 21 – 23
g1 width of the nut wing 5.6 – 6.4
g2 width of the nut wing 6.5 – 7.5
r1 radius ≈ 11
r2 radius ≈ 1.2
r3 radius ≈ 1.6
r4 radius ≈ 7 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 D
M20
e width across corners 86 – 90
m nut height 16 – 21
h height of the nut 44 – 46.5
d2 external diameter of the nut 32 – 35
d3 diameter of the collar 27 – 29
g1 width of the nut wing 6.1 – 6.9
g2 width of the nut wing 7 – 8
r1 radius ≈ 14
r2 radius ≈ 1.6
r3 radius ≈ 2
r4 radius ≈ 8 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 315 D
M24
e width across corners 106 – 110
m nut height 20 – 25
h height of the nut 53.5 – 56.5
d2 external diameter of the nut 41 – 44
d3 diameter of the collar 35 – 37.5
g1 width of the nut wing 8.6 – 9.4
g2 width of the nut wing 9.5 – 10.5
r1 radius ≈ 18
r2 radius ≈ 2.5
r3 radius ≈ 2.5
r4 radius ≈ 9 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 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.