Dimensions mm · values as the standard states them Size P dk e m da t dh mass M2 0.4 5.5
5.2 – 5.5
4
3.85 – 4.15
2
1.75 – 2
0.2 – 2.3
tdroughholes – tdroughholes
1
1 – 1.14
0.31
M2.5 0.45 7
6.64 – 7
5
4.85 – 5.15
2.2
1.95 – 2.2
2.5 – 2.9
tdroughholes – tdroughholes
1.2
1.2 – 1.34
0.56
M3 0.5 8
7.64 – 8
5.5
5.35 – 5.65
2.5
2.25 – 2.5
3 – 3.5
1.3 – 1.7
1.5
1.5 – 1.64
0.83
(M3.5) 0.6 9
8.64 – 9
6
5.85 – 6.15
3
2.75 – 3
3.5 – 4
1.8 – 2.2
1.5
1.5 – 1.64
1.26
M4 0.7 10
9.64 – 10
7
6.82 – 7.18
3.5
3.2 – 3.5
4 – 4.6
1.8 – 2.2
1.5
1.5 – 1.64
1.83
M5 0.8 12
11.57 – 12
8
7.82 – 8.18
4.2
3.9 – 4.2
5 – 5.75
2.3 – 2.7
2
2 – 2.14
3.08
M6 1 14
13.57 – 14
10
9.82 – 10.18
5
4.7 – 5
6 – 6.75
2.8 – 3.2
2.5
2.5 – 2.64
4.93
M8 1.25 18
17.57 – 18
13
12.82 – 13.18
6.5
6.14 – 6.5
8 – 8.75
3.3 – 3.8
3
3 – 3.14
10.5
M10 1.5 22
21.48 – 22
15
14.82 – 15.18
8
7.64 – 8
10 – 10.8
3.8 – 4.3
3.5
3.5 – 3.68
19.3
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 547
M2
dk external diameter of the nut 5.5
e width across corners 4
m nut height 2
da transition diameter 0.2 – 2.3
t hole depth tdroughholes – tdroughholes
dh hole diameter 1
mass mass per 1000 pieces (kg) 0.31 Thread · ISO 261/262
Pitch P 0.4
d2 1.74
d3 1.509
Tap drill 1.6
Stress area As 2.07 mm² Size sheet · DIN 547
M2.5
dk external diameter of the nut 7
e width across corners 5
m nut height 2.2
da transition diameter 2.5 – 2.9
t hole depth tdroughholes – tdroughholes
dh hole diameter 1.2
mass mass per 1000 pieces (kg) 0.56 Thread · ISO 261/262
Pitch P 0.45
d2 2.208
d3 1.948
Tap drill 2.05
Stress area As 3.39 mm² Size sheet · DIN 547
M3
dk external diameter of the nut 8
e width across corners 5.5
m nut height 2.5
da transition diameter 3 – 3.5
t hole depth 1.3 – 1.7
dh hole diameter 1.5
mass mass per 1000 pieces (kg) 0.83 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 547
M3.5
dk external diameter of the nut 9
e width across corners 6
m nut height 3
da transition diameter 3.5 – 4
t hole depth 1.8 – 2.2
dh hole diameter 1.5
mass mass per 1000 pieces (kg) 1.26 Thread · ISO 261/262
Pitch P 0.6
d2 3.11
d3 2.764
Tap drill 2.9
Stress area As 6.78 mm² Size sheet · DIN 547
M4
dk external diameter of the nut 10
e width across corners 7
m nut height 3.5
da transition diameter 4 – 4.6
t hole depth 1.8 – 2.2
dh hole diameter 1.5
mass mass per 1000 pieces (kg) 1.83 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 547
M5
dk external diameter of the nut 12
e width across corners 8
m nut height 4.2
da transition diameter 5 – 5.75
t hole depth 2.3 – 2.7
dh hole diameter 2
mass mass per 1000 pieces (kg) 3.08 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 547
M6
dk external diameter of the nut 14
e width across corners 10
m nut height 5
da transition diameter 6 – 6.75
t hole depth 2.8 – 3.2
dh hole diameter 2.5
mass mass per 1000 pieces (kg) 4.93 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 547
M8
dk external diameter of the nut 18
e width across corners 13
m nut height 6.5
da transition diameter 8 – 8.75
t hole depth 3.3 – 3.8
dh hole diameter 3
mass mass per 1000 pieces (kg) 10.5 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 547
M10
dk external diameter of the nut 22
e width across corners 15
m nut height 8
da transition diameter 10 – 10.8
t hole depth 3.8 – 4.3
dh hole diameter 3.5
mass mass per 1000 pieces (kg) 19.3 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 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.
Data notes (1) M2 e: min/max labels swapped in the source table — corrected.