Dimensions mm · values as the standard states them Size P s e m dw da r h1 h2 mass m´ thread_alt M4 0.7 7
6.78 – 7
≥ 7.66
≥ 2.9
≥ 5.9
4 – 4.6
2.5
2.3 – 2.7
5.6
5.35 – 5.85
9.6
9.3 – 9.9
1.4
≥ 2.32
—
M5 0.8 8
7.78 – 8
≥ 8.79
≥ 4.4
≥ 6.9
5 – 5.75
3
2.5 – 3.5
6
5.75 – 6.25
10.5
10.15 – 10.85
1.55
≥ 3.52
—
M6 1 10
9.78 – 10
≥ 11.05
≥ 4.9
≥ 8.9
6 – 6.75
3.5
3 – 4
7.5
7.15 – 7.85
12
11.65 – 12.35
3.3
≥ 3.92
—
M8 1.25 13
12.73 – 13
≥ 14.38
≥ 6.44
≥ 11.6
8 – 8.75
4.6
4.1 – 5.1
8.9
8.55 – 9.25
14
13.65 – 14.35
5.3
≥ 5.15
M8x1
M10 1.5 17
16.73 – 17
≥ 18.9
≥ 8.04
≥ 15.6
10 – 10.8
5.8
5.3 – 6.3
10.5
10.1 – 10.9
18.1
17.7 – 18.5
10.7
≥ 6.43
M10x1,25
M12 1.75 19
18.67 – 19
≥ 21.1
≥ 10.37
≥ 17.4
12 – 13
6.8
5.8 – 7.8
13.5
13.1 – 13.9
22.5
22.1 – 22.9
19
≥ 8.3
M12x1,25
M14 2 22
21.67 – 22
≥ 24.49
≥ 12.1
≥ 20.5
14 – 15.1
7.8
6.8 – 8.8
15.5
15.1 – 15.9
26.4
26 – 26.8
26.8
≥ 9.68
M14x1,5
M16 2 24
23.67 – 24
≥ 26.75
≥ 14.1
≥ 22.5
16 – 17.3
8.6
7.8 – 9.8
16.5
16.1 – 16.9
27.5
27.1 – 27.9
37.1
≥ 11.28
M16x1,5
M20 2.5 30
29.16 – 30
≥ 32.95
≥ 16.9
≥ 27.7
20 – 21.6
10.8
9.8 – 11.8
21
20.5 – 21.5
35
34.5 – 35.5
111
≥ 13.52
M20x1,5
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 986
M4
s width across flats 7
e width across corners ≥ 7.66
m hight of the nut part ≥ 2.9
dw bearing face diameter ≥ 5.9
da transition diameter 4 – 4.6
r 2.5
h1 5.6
h2 9.6
mass mass per 1000 pieces (kg) 1.4
m´ ≥ 2.32 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 986
M5
s width across flats 8
e width across corners ≥ 8.79
m hight of the nut part ≥ 4.4
dw bearing face diameter ≥ 6.9
da transition diameter 5 – 5.75
r 3
h1 6
h2 10.5
mass mass per 1000 pieces (kg) 1.55
m´ ≥ 3.52 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 986
M6
s width across flats 10
e width across corners ≥ 11.05
m hight of the nut part ≥ 4.9
dw bearing face diameter ≥ 8.9
da transition diameter 6 – 6.75
r 3.5
h1 7.5
h2 12
mass mass per 1000 pieces (kg) 3.3
m´ ≥ 3.92 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 986
M8
s width across flats 13
e width across corners ≥ 14.38
m hight of the nut part ≥ 6.44
dw bearing face diameter ≥ 11.6
da transition diameter 8 – 8.75
r 4.6
h1 8.9
h2 14
mass mass per 1000 pieces (kg) 5.3
m´ ≥ 5.15
thread_alt alternative / fine thread M8x1 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 986
M10
s width across flats 17
e width across corners ≥ 18.9
m hight of the nut part ≥ 8.04
dw bearing face diameter ≥ 15.6
da transition diameter 10 – 10.8
r 5.8
h1 10.5
h2 18.1
mass mass per 1000 pieces (kg) 10.7
m´ ≥ 6.43
thread_alt alternative / fine thread M10x1,25 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 986
M12
s width across flats 19
e width across corners ≥ 21.1
m hight of the nut part ≥ 10.37
dw bearing face diameter ≥ 17.4
da transition diameter 12 – 13
r 6.8
h1 13.5
h2 22.5
mass mass per 1000 pieces (kg) 19
m´ ≥ 8.3
thread_alt alternative / fine thread M12x1,25 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 986
M14
s width across flats 22
e width across corners ≥ 24.49
m hight of the nut part ≥ 12.1
dw bearing face diameter ≥ 20.5
da transition diameter 14 – 15.1
r 7.8
h1 15.5
h2 26.4
mass mass per 1000 pieces (kg) 26.8
m´ ≥ 9.68
thread_alt alternative / fine thread M14x1,5 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 986
M16
s width across flats 24
e width across corners ≥ 26.75
m hight of the nut part ≥ 14.1
dw bearing face diameter ≥ 22.5
da transition diameter 16 – 17.3
r 8.6
h1 16.5
h2 27.5
mass mass per 1000 pieces (kg) 37.1
m´ ≥ 11.28
thread_alt alternative / fine thread M16x1,5 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 986
M20
s width across flats 30
e width across corners ≥ 32.95
m hight of the nut part ≥ 16.9
dw bearing face diameter ≥ 27.7
da transition diameter 20 – 21.6
r 10.8
h1 21
h2 35
mass mass per 1000 pieces (kg) 111
m´ ≥ 13.52
thread_alt alternative / fine thread M20x1,5 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.