Dimensions mm · values as the standard states them Size P s e m h M3 0.5 5.5
6.01
2
3.7
M4 0.7 7
7.66
2.2
4.2
M5 0.8 8
8.79
2.75
5.1
M6 1 10
11.05
3.3
6
M7 1 11
12.12
3.8
7
M8 1.25 13
14.38
4.4
8
M10 1.5 16
17.77
5.5
10
M12 1.75 18
20.03
6.6
12
M14 2 21
23.35
7.7
14
M16 2 24
26.75
8.8
16
M20 2.5 30
32.95
11
20
M24 3 36
39.55
13.2
24
M30 3.5 46
50.85
16.5
30
M36 4 55
60.79
19.8
36
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 6925
M3
s width across flats 5.5
e width across corners 6.01
m hight of the nut part 2
h height of the nut 3.7 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 6925
M4
s width across flats 7
e width across corners 7.66
m hight of the nut part 2.2
h height of the nut 4.2 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 6925
M5
s width across flats 8
e width across corners 8.79
m hight of the nut part 2.75
h height of the nut 5.1 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 6925
M6
s width across flats 10
e width across corners 11.05
m hight of the nut part 3.3
h height of the nut 6 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 6925
M7
s width across flats 11
e width across corners 12.12
m hight of the nut part 3.8
h height of the nut 7 Thread · ISO 261/262
Pitch P 1
d2 6.35
d3 5.773
Tap drill 6
Stress area As 28.86 mm² Size sheet · DIN 6925
M8
s width across flats 13
e width across corners 14.38
m hight of the nut part 4.4
h height of the nut 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 6925
M10
s width across flats 16
e width across corners 17.77
m hight of the nut part 5.5
h height of the nut 10 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 6925
M12
s width across flats 18
e width across corners 20.03
m hight of the nut part 6.6
h height of the nut 12 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 6925
M14
s width across flats 21
e width across corners 23.35
m hight of the nut part 7.7
h height of the nut 14 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 6925
M16
s width across flats 24
e width across corners 26.75
m hight of the nut part 8.8
h height of the nut 16 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 6925
M20
s width across flats 30
e width across corners 32.95
m hight of the nut part 11
h height of the nut 20 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 6925
M24
s width across flats 36
e width across corners 39.55
m hight of the nut part 13.2
h height of the nut 24 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Size sheet · DIN 6925
M30
s width across flats 46
e width across corners 50.85
m hight of the nut part 16.5
h height of the nut 30 Thread · ISO 261/262
Pitch P 3.5
d2 27.727
d3 25.706
Tap drill 26.5
Stress area As 560.59 mm² Size sheet · DIN 6925
M36
s width across flats 55
e width across corners 60.79
m hight of the nut part 19.8
h height of the nut 36 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 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.