Dimensions mm · values as the standard states them Grade A Grade B
Series 1 Series 2 Series 3
Size P dk s s e e m h h dw da r t g2 g2 g2 mass Mw thread_alt thread_alt w x x x M4 0.7 ≤ 6.5
7
6.78 – 7
7
6.64 – 7
≥ 7.66
≥ 7.5
2.9 – 3.2
7.64 – 8
7.42 – 8
≥ 5.9
4 – 4.6
≈ 3.25
5.26 – 5.74
—
—
—
—
≥ 2.32
—
—
≥ 2
≤ 1.4
—
—
M5 0.8 ≤ 7.5
8
7.78 – 8
8
7.64 – 8
≥ 8.79
≥ 8.63
3.7 – 4
9.64 – 10
9.42 – 10
≥ 6.9
5 – 5.75
≈ 3.75
7.21 – 7.79
—
—
—
—
≥ 2.96
—
—
≥ 2
≤ 1.6
—
—
M6 1 ≤ 9.5
10
9.78 – 10
10
9.64 – 10
≥ 11.05
≥ 10.89
4.7 – 5
11.57 – 12
11.3 – 12
≥ 8.9
6 – 6.75
≈ 4.75
7.71 – 8.29
—
—
—
4.66
≥ 3.76
—
—
≥ 2
≤ 2
—
—
M8 1.25 ≤ 12.5
13
12.73 – 13
13
12.57 – 13
≥ 14.38
≥ 14.2
6.14 – 6.5
14.57 – 15
14.3 – 15
≥ 11.6
8 – 8.75
≈ 6.25
10.65 – 11.35
—
—
—
11
≥ 4.91
M8x1
—
≥ 2
≤ 2.5
≤ 2
—
M10 1.5 ≤ 15
16
15.73 – 16
16
15.57 – 16
≥ 17.77
≥ 17.59
7.64 – 8.8
17.57 – 18
17.3 – 18
≥ 14.6
10 – 10.8
≈ 7.5
12.65 – 13.35
—
—
—
20.1
≥ 6.11
M10x1
M10x1,25
≥ 2
≤ 3
≤ 2
≤ 2.5
M12 1.75 ≤ 17
18
17.73 – 18
18
17.57 – 18
≥ 20.03
≥ 19.85
9.64 – 10
21.48 – 22
21.16 – 22
≥ 16.6
12 – 13
≈ 8.5
15.65 – 16.35
≤ 6.4
≤ 5.6
≤ 4.9
28.3
≥ 7.71
M12x1,5
M12x1,25
≥ 3
—
—
—
(M14) 2 ≤ 20
21
20.67 – 21
21
20.16 – 21
≥ 23.35
≥ 22.78
10.3 – 11
24.48 – 25
24.16 – 25
≥ 19.6
14 – 15.1
≈ 10
17.65 – 18.35
≤ 7.3
≤ 5.6
—
—
≥ 8.24
(M14x1,5)
—
≥ 4
—
—
—
M16 2 ≤ 23
24
23.67 – 24
24
23.16 – 24
≥ 26.75
≥ 26.17
12.3 – 13
27.48 – 28
27.16 – 28
≥ 22.5
16 – 17.3
≈ 11.5
20.58 – 21.42
≤ 7.3
≤ 5.6
—
54.3
≥ 9.84
(M16x1,5)
—
≥ 4
—
—
—
(M18) 2.5 ≤ 26
27
26.67 – 27
27
26.16 – 27
≥ 30.14
≥ 29.56
14.3 – 15
32.38 – 32
31 – 32
≥ 24.9
18 – 19.5
≈ 13
24.58 – 25.42
≤ 9.3
≤ 5.6
≤ 7.3
95
≥ 11.44
(M18x1,5)
(M18x2)
≥ 5
—
—
—
M20 2.5 ≤ 28
30
29.67 – 30
30
29.16 – 30
≥ 33.53
≥ 32.95
14.9 – 16
33.38 – 34
33 – 34
≥ 27.7
20 – 21.6
≈ 14
25.58 – 26.42
≤ 9.3
≤ 7.3
≤ 5.6
104
≥ 11.92
M20x2
M20x1,5
≥ 5
—
—
—
(M22) 2.5 ≤ 33
34
33.38 – 34
34
33 – 34
≥ 37.72
≥ 37.29
16.9 – 18
38.38 – 39
38 – 39
≥ 31.4
22 – 23.7
≈ 16.5
28.58 – 29.42
≤ 9.3
≤ 5.6
≤ 7.3
—
≥ 13.52
(M22x1,5)
(M22x2)
≥ 5
—
—
—
M24 3 ≤ 34
36
35.38 – 36
36
35 – 36
≥ 39.98
≥ 39.55
17.7 – 19
41.38 – 42
41 – 42
≥ 33.3
24 – 25.9
≈ 17
30.5 – 31.5
≤ 10.7
≤ 7.3
—
216
≥ 14.16
M24x2
—
≥ 6
—
—
—
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 1587
M4
dk head diameter ≤ 6.5
s width across flats 7
s width across flats 7
e width across corners ≥ 7.66
e width across corners ≥ 7.5
m hight of the nut part 2.9 – 3.2
h height of the nut 7.64 – 8
h height of the nut 7.42 – 8
dw bearing face diameter ≥ 5.9
da transition diameter 4 – 4.6
r ≈ 3.25
t length of the thread 5.26 – 5.74
Mw ≥ 2.32
w ≥ 2
x ≤ 1.4 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 1587
M5
dk head diameter ≤ 7.5
s width across flats 8
s width across flats 8
e width across corners ≥ 8.79
e width across corners ≥ 8.63
m hight of the nut part 3.7 – 4
h height of the nut 9.64 – 10
h height of the nut 9.42 – 10
dw bearing face diameter ≥ 6.9
da transition diameter 5 – 5.75
r ≈ 3.75
t length of the thread 7.21 – 7.79
Mw ≥ 2.96
w ≥ 2
x ≤ 1.6 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 1587
M6
dk head diameter ≤ 9.5
s width across flats 10
s width across flats 10
e width across corners ≥ 11.05
e width across corners ≥ 10.89
m hight of the nut part 4.7 – 5
h height of the nut 11.57 – 12
h height of the nut 11.3 – 12
dw bearing face diameter ≥ 8.9
da transition diameter 6 – 6.75
r ≈ 4.75
t length of the thread 7.71 – 8.29
mass mass per 1000 pieces (kg) 4.66
Mw ≥ 3.76
w ≥ 2
x ≤ 2 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 1587
M8
dk head diameter ≤ 12.5
s width across flats 13
s width across flats 13
e width across corners ≥ 14.38
e width across corners ≥ 14.2
m hight of the nut part 6.14 – 6.5
h height of the nut 14.57 – 15
h height of the nut 14.3 – 15
dw bearing face diameter ≥ 11.6
da transition diameter 8 – 8.75
r ≈ 6.25
t length of the thread 10.65 – 11.35
mass mass per 1000 pieces (kg) 11
Mw ≥ 4.91
thread_alt alternative / fine thread M8x1
w ≥ 2
x ≤ 2.5
x ≤ 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 1587
M10
dk head diameter ≤ 15
s width across flats 16
s width across flats 16
e width across corners ≥ 17.77
e width across corners ≥ 17.59
m hight of the nut part 7.64 – 8.8
h height of the nut 17.57 – 18
h height of the nut 17.3 – 18
dw bearing face diameter ≥ 14.6
da transition diameter 10 – 10.8
r ≈ 7.5
t length of the thread 12.65 – 13.35
mass mass per 1000 pieces (kg) 20.1
Mw ≥ 6.11
thread_alt alternative / fine thread M10x1
thread_alt alternative / fine thread M10x1,25
w ≥ 2
x ≤ 3
x ≤ 2
x ≤ 2.5 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 1587
M12
dk head diameter ≤ 17
s width across flats 18
s width across flats 18
e width across corners ≥ 20.03
e width across corners ≥ 19.85
m hight of the nut part 9.64 – 10
h height of the nut 21.48 – 22
h height of the nut 21.16 – 22
dw bearing face diameter ≥ 16.6
da transition diameter 12 – 13
r ≈ 8.5
t length of the thread 15.65 – 16.35
g2 ≤ 6.4
g2 ≤ 5.6
g2 ≤ 4.9
mass mass per 1000 pieces (kg) 28.3
Mw ≥ 7.71
thread_alt alternative / fine thread M12x1,5
thread_alt alternative / fine thread M12x1,25
w ≥ 3 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 1587
M14
dk head diameter ≤ 20
s width across flats 21
s width across flats 21
e width across corners ≥ 23.35
e width across corners ≥ 22.78
m hight of the nut part 10.3 – 11
h height of the nut 24.48 – 25
h height of the nut 24.16 – 25
dw bearing face diameter ≥ 19.6
da transition diameter 14 – 15.1
r ≈ 10
t length of the thread 17.65 – 18.35
g2 ≤ 7.3
g2 ≤ 5.6
Mw ≥ 8.24
thread_alt alternative / fine thread (M14x1,5)
w ≥ 4 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 1587
M16
dk head diameter ≤ 23
s width across flats 24
s width across flats 24
e width across corners ≥ 26.75
e width across corners ≥ 26.17
m hight of the nut part 12.3 – 13
h height of the nut 27.48 – 28
h height of the nut 27.16 – 28
dw bearing face diameter ≥ 22.5
da transition diameter 16 – 17.3
r ≈ 11.5
t length of the thread 20.58 – 21.42
g2 ≤ 7.3
g2 ≤ 5.6
mass mass per 1000 pieces (kg) 54.3
Mw ≥ 9.84
thread_alt alternative / fine thread (M16x1,5)
w ≥ 4 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 1587
M18
dk head diameter ≤ 26
s width across flats 27
s width across flats 27
e width across corners ≥ 30.14
e width across corners ≥ 29.56
m hight of the nut part 14.3 – 15
h height of the nut 32.38 – 32
h height of the nut 31 – 32
dw bearing face diameter ≥ 24.9
da transition diameter 18 – 19.5
r ≈ 13
t length of the thread 24.58 – 25.42
g2 ≤ 9.3
g2 ≤ 5.6
g2 ≤ 7.3
mass mass per 1000 pieces (kg) 95
Mw ≥ 11.44
thread_alt alternative / fine thread (M18x1,5)
thread_alt alternative / fine thread (M18x2)
w ≥ 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 1587
M20
dk head diameter ≤ 28
s width across flats 30
s width across flats 30
e width across corners ≥ 33.53
e width across corners ≥ 32.95
m hight of the nut part 14.9 – 16
h height of the nut 33.38 – 34
h height of the nut 33 – 34
dw bearing face diameter ≥ 27.7
da transition diameter 20 – 21.6
r ≈ 14
t length of the thread 25.58 – 26.42
g2 ≤ 9.3
g2 ≤ 7.3
g2 ≤ 5.6
mass mass per 1000 pieces (kg) 104
Mw ≥ 11.92
thread_alt alternative / fine thread M20x2
thread_alt alternative / fine thread M20x1,5
w ≥ 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 Size sheet · DIN 1587
M22
dk head diameter ≤ 33
s width across flats 34
s width across flats 34
e width across corners ≥ 37.72
e width across corners ≥ 37.29
m hight of the nut part 16.9 – 18
h height of the nut 38.38 – 39
h height of the nut 38 – 39
dw bearing face diameter ≥ 31.4
da transition diameter 22 – 23.7
r ≈ 16.5
t length of the thread 28.58 – 29.42
g2 ≤ 9.3
g2 ≤ 5.6
g2 ≤ 7.3
Mw ≥ 13.52
thread_alt alternative / fine thread (M22x1,5)
thread_alt alternative / fine thread (M22x2)
w ≥ 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 1587
M24
dk head diameter ≤ 34
s width across flats 36
s width across flats 36
e width across corners ≥ 39.98
e width across corners ≥ 39.55
m hight of the nut part 17.7 – 19
h height of the nut 41.38 – 42
h height of the nut 41 – 42
dw bearing face diameter ≥ 33.3
da transition diameter 24 – 25.9
r ≈ 17
t length of the thread 30.5 – 31.5
g2 ≤ 10.7
g2 ≤ 7.3
mass mass per 1000 pieces (kg) 216
Mw ≥ 14.16
thread_alt alternative / fine thread M24x2
w ≥ 6 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.