Dimensions mm · values as the standard states them Size P dk m da t dh mass M2 0.4 5.5
5.2 – 5.5
2
≥ 1.75
2 – 2.3
1 – 1.4
1
1 – 1.14
0.31
M2.5 0.45 7
6.64 – 7
2.2
≥ 1.95
2.5 – 2.9
1.3 – 1.7
1.2
1.2 – 1.34
0.55
M3 0.5 8
7.64 – 8
2.5
≥ 2.25
3 – 3.45
1.3 – 1.7
1.5
1.5 – 1.64
0.79
M3.5 0.6 9
8.64 – 9
3
≥ 2.75
3.5 – 4
1.8 – 2.2
1.5
1.5 – 1.64
1.21
M4 0.7 10
9.64 – 10
3.5
≥ 3.2
4 – 4.6
1.8 – 2.2
1.5
1.5 – 1.64
1.78
M5 0.8 12
11.57 – 12
4.2
≥ 3.9
5 – 5.75
2.3 – 2.7
2
2 – 2.14
2.96
M6 1 14
13.57 – 14
5
≥ 4.7
6 – 6.75
2.8 – 3.2
2.5
2.5 – 2.64
4.7
M8 1.25 18
17.57 – 18
6.5
≥ 6.14
8 – 8.75
3.3 – 3.8
3
3 – 3.14
9.95
M10 1.5 22
21.48 – 22
8
≥ 7.64
10 – 10.8
3.8 – 4.3
3.5
3.5 – 3.68
18.7
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 548
M2
dk external diameter of the nut 5.5
m nut height 2
da transition diameter 2 – 2.3
t hole depth 1 – 1.4
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 548
M2.5
dk external diameter of the nut 7
m nut height 2.2
da transition diameter 2.5 – 2.9
t hole depth 1.3 – 1.7
dh hole diameter 1.2
mass mass per 1000 pieces (kg) 0.55 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 548
M3
dk external diameter of the nut 8
m nut height 2.5
da transition diameter 3 – 3.45
t hole depth 1.3 – 1.7
dh hole diameter 1.5
mass mass per 1000 pieces (kg) 0.79 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 548
M3.5
dk external diameter of the nut 9
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) 1.21 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 548
M4
dk external diameter of the nut 10
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) 1.78 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 548
M5
dk external diameter of the nut 12
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) 2.96 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 548
M6
dk external diameter of the nut 14
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) 4.7 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 548
M8
dk external diameter of the nut 18
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) 9.95 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 548
M10
dk external diameter of the nut 22
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) 18.7 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² 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.