Dimensions mm · values as the standard states them Size P s e m thread_alt fine w M8 13
14.38
6.5
—
3.2
M10 17
18.9
8
M10x1
3.7
M12 19
21.1
10
M12x1,5
4.7
M14 22
24.49
11
M14x1,5
5.7
M16 24
26.75
13
M16x1,5
6.64
M18 27
29.56
15
M18x1,5
8.64
M20 30
32.95
16
M20x1,5
9.64
M22 34
37.29
18
M22x1,5
9.64
M24 36
39.55
19
M24x1,5
10.57
M27 41
45.2
22
M27x1,5
13.5
M30 46
50.85
24
M30x1,5
14.57
M33 50
55.37
26
M33x1,5
16.57
M36 55
60.79
29
M36x1,5
19.48
M39 60
66.44
31
M39x1,5
21.48
M42 65
71.3
33
M42x1,5
21.48
M45 70
76.95
34
M45x1,5
22.02
M48 75
82.6
36
M48x1,5
23.48
M52 80
88.25
38
M52x1,5M52x2
25.48
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 979
M8
s width across flats 13
e width across corners 14.38
m height of the nut 6.5
w nut height at the crown 3.2 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 979
M10
s width across flats 17
e width across corners 18.9
m height of the nut 8
thread_alt alternative / fine thread (fine) M10x1
w nut height at the crown 3.7 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 979
M12
s width across flats 19
e width across corners 21.1
m height of the nut 10
thread_alt alternative / fine thread (fine) M12x1,5
w nut height at the crown 4.7 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 979
M14
s width across flats 22
e width across corners 24.49
m height of the nut 11
thread_alt alternative / fine thread (fine) M14x1,5
w nut height at the crown 5.7 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 979
M16
s width across flats 24
e width across corners 26.75
m height of the nut 13
thread_alt alternative / fine thread (fine) M16x1,5
w nut height at the crown 6.64 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 979
M18
s width across flats 27
e width across corners 29.56
m height of the nut 15
thread_alt alternative / fine thread (fine) M18x1,5
w nut height at the crown 8.64 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 979
M20
s width across flats 30
e width across corners 32.95
m height of the nut 16
thread_alt alternative / fine thread (fine) M20x1,5
w nut height at the crown 9.64 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 979
M22
s width across flats 34
e width across corners 37.29
m height of the nut 18
thread_alt alternative / fine thread (fine) M22x1,5
w nut height at the crown 9.64 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 979
M24
s width across flats 36
e width across corners 39.55
m height of the nut 19
thread_alt alternative / fine thread (fine) M24x1,5
w nut height at the crown 10.57 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 979
M27
s width across flats 41
e width across corners 45.2
m height of the nut 22
thread_alt alternative / fine thread (fine) M27x1,5
w nut height at the crown 13.5 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 979
M30
s width across flats 46
e width across corners 50.85
m height of the nut 24
thread_alt alternative / fine thread (fine) M30x1,5
w nut height at the crown 14.57 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 979
M33
s width across flats 50
e width across corners 55.37
m height of the nut 26
thread_alt alternative / fine thread (fine) M33x1,5
w nut height at the crown 16.57 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 979
M36
s width across flats 55
e width across corners 60.79
m height of the nut 29
thread_alt alternative / fine thread (fine) M36x1,5
w nut height at the crown 19.48 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 979
M39
s width across flats 60
e width across corners 66.44
m height of the nut 31
thread_alt alternative / fine thread (fine) M39x1,5
w nut height at the crown 21.48 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 979
M42
s width across flats 65
e width across corners 71.3
m height of the nut 33
thread_alt alternative / fine thread (fine) M42x1,5
w nut height at the crown 21.48 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 979
M45
s width across flats 70
e width across corners 76.95
m height of the nut 34
thread_alt alternative / fine thread (fine) M45x1,5
w nut height at the crown 22.02 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 979
M48
s width across flats 75
e width across corners 82.6
m height of the nut 36
thread_alt alternative / fine thread (fine) M48x1,5
w nut height at the crown 23.48 Thread · ISO 261/262
Pitch P 5
d2 44.752
d3 41.866
Tap drill 43
Stress area As 1473.15 mm² Size sheet · DIN 979
M52
s width across flats 80
e width across corners 88.25
m height of the nut 38
thread_alt alternative / fine thread (fine) M52x1,5M52x2
w nut height at the crown 25.48 Thread · ISO 261/262
Pitch P 5
d2 48.752
d3 45.866
Tap drill 47
Stress area As 1757.83 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.