Dimensions mm · values as the standard states them Series 1 Series 2 Series 3
Size P s e h dw da r t g g g mass m´ thread_alt thread_alt w x2 x2 x2 M4 0.7 7
6.78 – 7
≥ 7.66
5.5
5.2 – 5.5
≥ 5.8
4 – 4.6
≈ 8
4.16 – 4.64
—
—
—
1.31
≥ 2.75
—
—
≥ 1
≤ 1.05
—
—
M5 0.8 8
7.78 – 8
≥ 8.79
7
6.64 – 7
≥ 6.8
5 – 5.75
≈ 10
4.96 – 5.44
—
—
—
2.2
≥ 3.5
—
—
≥ 1
≤ 1.2
—
—
M6 1 10
9.78 – 10
≥ 11.05
9
8.64 – 9
≥ 8.8
6 – 6.75
≈ 12
6.71 – 7.29
—
—
—
4.29
≥ 4.5
—
—
≥ 1.5
≤ 1.5
—
—
M8 1.25 13
12.73 – 13
≥ 14.38
12
11.57 – 12
≥ 11.3
8 – 8.75
≈ 15
9.21 – 9.79
—
—
—
9.5
≥ 6
M8x1
—
≥ 2
≤ 1.87
≤ 1.5
—
M10 1.5 17
16.73 – 17
≥ 18.9
14
13.57 – 14
≥ 15.3
10 – 10.8
≈ 20
10.65 – 11.35
—
—
—
19.3
≥ 7
M10x1
M10x1,25
≥ 2
≤ 2.25
≤ 1.5
≤ 1.87
M12 1.75 19
18.67 – 19
≥ 21.1
16
15.57 – 16
≥ 17.2
13 – 13
≈ 25
13.15 – 13.85
≤ 6.4
≤ 5.6
≤ 4.9
25.5
≥ 8
M12x1,5
M12x1,25
≥ 2
—
—
—
(M14) 2 22
21.67 – 22
≥ 24.49
18
17.57 – 18
≥ 20.2
15.1 – 15.1
≈ 28
14.65 – 15.35
≤ 7.3
≤ 5.6
—
37
≥ 9
(M14x1,5)
—
≥ 2
—
—
—
M16 2 24
23.67 – 24
≥ 26.75
20
19.48 – 20
≥ 22.2
17.3 – 17.3
≈ 30
16.65 – 17.35
≤ 7.3
≤ 5.6
—
48.1
≥ 10
M16x1,5
—
≥ 2
—
—
—
(M18) 2.5 27
26.16 – 27
≥ 29.56
22
21.48 – 22
≥ 25.3
19.5 – 19.5
≈ 32
18.58 – 19.42
≤ 9.3
≤ 5.6
≤ 7.3
70
≥ 11
(M18x1,5)
(M18x2)
≥ 2
—
—
—
M20 2.5 30
29.16 – 30
≥ 32.95
25
24.48 – 25
≥ 28.2
21.6 – 21.6
≈ 35
20.58 – 21.42
≤ 9.3
≤ 7.3
≤ 5.6
94.1
≥ 12.5
M20x2
M20x1,5
≥ 2.5
—
—
—
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 917
M4
s width across flats 7
e width across corners ≥ 7.66
h height of the nut 5.5
dw bearing face diameter ≥ 5.8
da transition diameter 4 – 4.6
r ≈ 8
t hole depth 4.16 – 4.64
mass mass per 1000 pieces (kg) 1.31
m´ ≥ 2.75
w ≥ 1
x2 ≤ 1.05 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 917
M5
s width across flats 8
e width across corners ≥ 8.79
h height of the nut 7
dw bearing face diameter ≥ 6.8
da transition diameter 5 – 5.75
r ≈ 10
t hole depth 4.96 – 5.44
mass mass per 1000 pieces (kg) 2.2
m´ ≥ 3.5
w ≥ 1
x2 ≤ 1.2 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 917
M6
s width across flats 10
e width across corners ≥ 11.05
h height of the nut 9
dw bearing face diameter ≥ 8.8
da transition diameter 6 – 6.75
r ≈ 12
t hole depth 6.71 – 7.29
mass mass per 1000 pieces (kg) 4.29
m´ ≥ 4.5
w ≥ 1.5
x2 ≤ 1.5 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 917
M8
s width across flats 13
e width across corners ≥ 14.38
h height of the nut 12
dw bearing face diameter ≥ 11.3
da transition diameter 8 – 8.75
r ≈ 15
t hole depth 9.21 – 9.79
mass mass per 1000 pieces (kg) 9.5
m´ ≥ 6
thread_alt alternative / fine thread M8x1
w ≥ 2
x2 ≤ 1.87
x2 ≤ 1.5 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 917
M10
s width across flats 17
e width across corners ≥ 18.9
h height of the nut 14
dw bearing face diameter ≥ 15.3
da transition diameter 10 – 10.8
r ≈ 20
t hole depth 10.65 – 11.35
mass mass per 1000 pieces (kg) 19.3
m´ ≥ 7
thread_alt alternative / fine thread M10x1
thread_alt alternative / fine thread M10x1,25
w ≥ 2
x2 ≤ 2.25
x2 ≤ 1.5
x2 ≤ 1.87 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 917
M12
s width across flats 19
e width across corners ≥ 21.1
h height of the nut 16
dw bearing face diameter ≥ 17.2
da transition diameter 13 – 13
r ≈ 25
t hole depth 13.15 – 13.85
g ≤ 6.4
g ≤ 5.6
g ≤ 4.9
mass mass per 1000 pieces (kg) 25.5
m´ ≥ 8
thread_alt alternative / fine thread M12x1,5
thread_alt alternative / fine thread M12x1,25
w ≥ 2 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 917
M14
s width across flats 22
e width across corners ≥ 24.49
h height of the nut 18
dw bearing face diameter ≥ 20.2
da transition diameter 15.1 – 15.1
r ≈ 28
t hole depth 14.65 – 15.35
g ≤ 7.3
g ≤ 5.6
mass mass per 1000 pieces (kg) 37
m´ ≥ 9
thread_alt alternative / fine thread (M14x1,5)
w ≥ 2 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 917
M16
s width across flats 24
e width across corners ≥ 26.75
h height of the nut 20
dw bearing face diameter ≥ 22.2
da transition diameter 17.3 – 17.3
r ≈ 30
t hole depth 16.65 – 17.35
g ≤ 7.3
g ≤ 5.6
mass mass per 1000 pieces (kg) 48.1
m´ ≥ 10
thread_alt alternative / fine thread M16x1,5
w ≥ 2 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 917
M18
s width across flats 27
e width across corners ≥ 29.56
h height of the nut 22
dw bearing face diameter ≥ 25.3
da transition diameter 19.5 – 19.5
r ≈ 32
t hole depth 18.58 – 19.42
g ≤ 9.3
g ≤ 5.6
g ≤ 7.3
mass mass per 1000 pieces (kg) 70
m´ ≥ 11
thread_alt alternative / fine thread (M18x1,5)
thread_alt alternative / fine thread (M18x2)
w ≥ 2 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 917
M20
s width across flats 30
e width across corners ≥ 32.95
h height of the nut 25
dw bearing face diameter ≥ 28.2
da transition diameter 21.6 – 21.6
r ≈ 35
t hole depth 20.58 – 21.42
g ≤ 9.3
g ≤ 7.3
g ≤ 5.6
mass mass per 1000 pieces (kg) 94.1
m´ ≥ 12.5
thread_alt alternative / fine thread M20x2
thread_alt alternative / fine thread M20x1,5
w ≥ 2.5 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² 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.