Dimensions mm · values as the standard states them Size P s e m h M3 0.5 5.5
6.01
2.15
4,2-4,5
M4 0.7 7
7.66
2.9
5,7-6,0
M5 0.8 8
8.79
4.4
6,44-6,8
M6 1 10
11.05
4.9
7,64-8,0
M7 1 11
12.12
6.14
8,64-9,0
M8 1.25 13
14.38
6.44
9,14-9,5
M10 1.5 16
17.77
8.04
11,5-11,9
M12 1.75 18
20.03
10.37
14,5-14,9
M14 2 21
23.35
12.1
16,3-17,0
M16 2 24
26.75
14.1
18,3-19,1
M18 2.5 27
29.56
15.1
19,8-20,6
M20 2.5 30
32.95
16.9
21,5-22,8
M22 2.5 34
37.29
18.1
23,2-24,5
M24 3 36
39.55
20.2
25,8-27,1
M27 3 41
45.2
22.5
29,4-31,0
M30 3.5 46
50.85
24.3
31,0-32,6
M33 3.5 50
55.37
27.4
33,9-35,5
M36 4 55
60.79
29.4
37,3-38,9
M39 4 60
66.44
31.8
40,4-42,0
M42 4.5 65
71.3
34
43,4-45,0
M45 4.5 70
76.95
36
46,4-48,0
M48 5 75
82.6
38
48,4-50,0
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 6924
M3
s width across flats 5.5
e width across corners 6.01
m hight of the nut part 2.15
h height of the nut 4,2-4,5 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 6924
M4
s width across flats 7
e width across corners 7.66
m hight of the nut part 2.9
h height of the nut 5,7-6,0 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 6924
M5
s width across flats 8
e width across corners 8.79
m hight of the nut part 4.4
h height of the nut 6,44-6,8 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 6924
M6
s width across flats 10
e width across corners 11.05
m hight of the nut part 4.9
h height of the nut 7,64-8,0 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 6924
M7
s width across flats 11
e width across corners 12.12
m hight of the nut part 6.14
h height of the nut 8,64-9,0 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 6924
M8
s width across flats 13
e width across corners 14.38
m hight of the nut part 6.44
h height of the nut 9,14-9,5 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 6924
M10
s width across flats 16
e width across corners 17.77
m hight of the nut part 8.04
h height of the nut 11,5-11,9 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 6924
M12
s width across flats 18
e width across corners 20.03
m hight of the nut part 10.37
h height of the nut 14,5-14,9 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 6924
M14
s width across flats 21
e width across corners 23.35
m hight of the nut part 12.1
h height of the nut 16,3-17,0 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 6924
M16
s width across flats 24
e width across corners 26.75
m hight of the nut part 14.1
h height of the nut 18,3-19,1 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 6924
M18
s width across flats 27
e width across corners 29.56
m hight of the nut part 15.1
h height of the nut 19,8-20,6 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 6924
M20
s width across flats 30
e width across corners 32.95
m hight of the nut part 16.9
h height of the nut 21,5-22,8 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 6924
M22
s width across flats 34
e width across corners 37.29
m hight of the nut part 18.1
h height of the nut 23,2-24,5 Thread · ISO 261/262
Pitch P 2.5
d2 20.376
d3 18.933
Tap drill 19.5
Stress area As 303.4 mm² Size sheet · DIN 6924
M24
s width across flats 36
e width across corners 39.55
m hight of the nut part 20.2
h height of the nut 25,8-27,1 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 6924
M27
s width across flats 41
e width across corners 45.2
m hight of the nut part 22.5
h height of the nut 29,4-31,0 Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Size sheet · DIN 6924
M30
s width across flats 46
e width across corners 50.85
m hight of the nut part 24.3
h height of the nut 31,0-32,6 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 6924
M33
s width across flats 50
e width across corners 55.37
m hight of the nut part 27.4
h height of the nut 33,9-35,5 Thread · ISO 261/262
Pitch P 3.5
d2 30.727
d3 28.706
Tap drill 29.5
Stress area As 693.55 mm² Size sheet · DIN 6924
M36
s width across flats 55
e width across corners 60.79
m hight of the nut part 29.4
h height of the nut 37,3-38,9 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 mm² Size sheet · DIN 6924
M39
s width across flats 60
e width across corners 66.44
m hight of the nut part 31.8
h height of the nut 40,4-42,0 Thread · ISO 261/262
Pitch P 4
d2 36.402
d3 34.093
Tap drill 35
Stress area As 975.75 mm² Size sheet · DIN 6924
M42
s width across flats 65
e width across corners 71.3
m hight of the nut part 34
h height of the nut 43,4-45,0 Thread · ISO 261/262
Pitch P 4.5
d2 39.077
d3 36.479
Tap drill 37.5
Stress area As 1120.91 mm² Size sheet · DIN 6924
M45
s width across flats 70
e width across corners 76.95
m hight of the nut part 36
h height of the nut 46,4-48,0 Thread · ISO 261/262
Pitch P 4.5
d2 42.077
d3 39.479
Tap drill 40.5
Stress area As 1306 mm² Size sheet · DIN 6924
M48
s width across flats 75
e width across corners 82.6
m hight of the nut part 38
h height of the nut 48,4-50,0 Thread · ISO 261/262
Pitch P 5
d2 44.752
d3 41.866
Tap drill 43
Stress area As 1473.15 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.