Dimensions mm · values as the standard states them Size P ds dk k h da c r knurl mass M1 0.25 2.55 – 2.8
5.5
5.26 – 5.74
1.25 – 1.5
3.2 – 3.5
1 – 1.15
≈ brokenedges
0.5
0.5
0.357
M1.2 0.25 2.75 – 3
6
5.76 – 6.24
1.25 – 1.5
3.7 – 4
1.2 – 1.4
≈ brokenedges
0.5
0.5
0.445
M1.4 0.3 3.2 – 3.5
7
6.71 – 7.29
1.75 – 2
4.4 – 4.7
1.4 – 1.6
≈ brokenedges
0.5
0.5
0.765
M1.6 0.35 3.5 – 3.8
7.5
7.21 – 7.79
1.75 – 2
4.7 – 5
1.6 – 1.84
≈ brokenedges
0.5
0.5
0.9
M2 0.4 4.2 – 4.5
9
8.71 – 9.29
1.75 – 2
5 – 5.3
2 – 2.3
≈ brokenedges
0.5
0.5
1.3
M2.5 0.45 4.7 – 5
11
10.65 – 11.35
2.25 – 2.5
6.14 – 6.5
2.5 – 2.9
≈ 0.3
0.5
0.6
2.2
M3 0.5 5.7 – 6
12
11.65 – 12.35
2.25 – 2.5
7.14 – 7.5
3 – 3.45
≈ 0.3
0.5
0.6
3
M4 0.7 7.64 – 8
16
15.65 – 16.35
3.2 – 3.5
9.14 – 9.5
4 – 4.6
≈ 0.4
0.5
0.6
7.19
M5 0.8 9.64 – 10
20
19.58 – 20.42
3.7 – 4
11.07 – 11.5
5 – 5.75
≈ 0.4
1
0.6
13
M6 1 11.57 – 12
24
23.58 – 24.42
4.7 – 5
14.57 – 15
6 – 6.75
≈ 0.5
1
0.6
24
M8 1.25 15.57 – 16
30
29.58 – 30.42
5.7 – 6
17.57 – 18
8 – 8.75
≈ 0.6
2
0.6
46
M10 1.5 19.48 – 20
36
35.5 – 36.5
7.64 – 8
22.48 – 23
10 – 10.8
≈ 0.8
2
0.8
88
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 466
M1
ds external diameter of the nut 2.55 – 2.8
dk head diameter 5.5
k height knurled ring 1.25 – 1.5
h height of the nut 3.2 – 3.5
da transition diameter 1 – 1.15
c width shrinkage ≈ brokenedges
r 0.5
knurl 0.5
mass mass per 1000 pieces (kg) 0.357 Thread · ISO 261/262
Pitch P 0.25
d2 0.838
d3 0.693
Tap drill 0.75
Stress area As 0.46 mm² Size sheet · DIN 466
M1.2
ds external diameter of the nut 2.75 – 3
dk head diameter 6
k height knurled ring 1.25 – 1.5
h height of the nut 3.7 – 4
da transition diameter 1.2 – 1.4
c width shrinkage ≈ brokenedges
r 0.5
knurl 0.5
mass mass per 1000 pieces (kg) 0.445 Thread · ISO 261/262
Pitch P 0.25
d2 1.038
d3 0.893
Tap drill 0.95
Stress area As 0.73 mm² Size sheet · DIN 466
M1.4
ds external diameter of the nut 3.2 – 3.5
dk head diameter 7
k height knurled ring 1.75 – 2
h height of the nut 4.4 – 4.7
da transition diameter 1.4 – 1.6
c width shrinkage ≈ brokenedges
r 0.5
knurl 0.5
mass mass per 1000 pieces (kg) 0.765 Thread · ISO 261/262
Pitch P 0.3
d2 1.205
d3 1.032
Tap drill 1.1
Stress area As 0.98 mm² Size sheet · DIN 466
M1.6
ds external diameter of the nut 3.5 – 3.8
dk head diameter 7.5
k height knurled ring 1.75 – 2
h height of the nut 4.7 – 5
da transition diameter 1.6 – 1.84
c width shrinkage ≈ brokenedges
r 0.5
knurl 0.5
mass mass per 1000 pieces (kg) 0.9 Thread · ISO 261/262
Pitch P 0.35
d2 1.373
d3 1.171
Tap drill 1.25
Stress area As 1.27 mm² Size sheet · DIN 466
M2
ds external diameter of the nut 4.2 – 4.5
dk head diameter 9
k height knurled ring 1.75 – 2
h height of the nut 5 – 5.3
da transition diameter 2 – 2.3
c width shrinkage ≈ brokenedges
r 0.5
knurl 0.5
mass mass per 1000 pieces (kg) 1.3 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 466
M2.5
ds external diameter of the nut 4.7 – 5
dk head diameter 11
k height knurled ring 2.25 – 2.5
h height of the nut 6.14 – 6.5
da transition diameter 2.5 – 2.9
c width shrinkage ≈ 0.3
r 0.5
knurl 0.6
mass mass per 1000 pieces (kg) 2.2 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 466
M3
ds external diameter of the nut 5.7 – 6
dk head diameter 12
k height knurled ring 2.25 – 2.5
h height of the nut 7.14 – 7.5
da transition diameter 3 – 3.45
c width shrinkage ≈ 0.3
r 0.5
knurl 0.6
mass mass per 1000 pieces (kg) 3 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 466
M4
ds external diameter of the nut 7.64 – 8
dk head diameter 16
k height knurled ring 3.2 – 3.5
h height of the nut 9.14 – 9.5
da transition diameter 4 – 4.6
c width shrinkage ≈ 0.4
r 0.5
knurl 0.6
mass mass per 1000 pieces (kg) 7.19 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 466
M5
ds external diameter of the nut 9.64 – 10
dk head diameter 20
k height knurled ring 3.7 – 4
h height of the nut 11.07 – 11.5
da transition diameter 5 – 5.75
c width shrinkage ≈ 0.4
r 1
knurl 0.6
mass mass per 1000 pieces (kg) 13 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 466
M6
ds external diameter of the nut 11.57 – 12
dk head diameter 24
k height knurled ring 4.7 – 5
h height of the nut 14.57 – 15
da transition diameter 6 – 6.75
c width shrinkage ≈ 0.5
r 1
knurl 0.6
mass mass per 1000 pieces (kg) 24 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 466
M8
ds external diameter of the nut 15.57 – 16
dk head diameter 30
k height knurled ring 5.7 – 6
h height of the nut 17.57 – 18
da transition diameter 8 – 8.75
c width shrinkage ≈ 0.6
r 2
knurl 0.6
mass mass per 1000 pieces (kg) 46 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 466
M10
ds external diameter of the nut 19.48 – 20
dk head diameter 36
k height knurled ring 7.64 – 8
h height of the nut 22.48 – 23
da transition diameter 10 – 10.8
c width shrinkage ≈ 0.8
r 2
knurl 0.8
mass mass per 1000 pieces (kg) 88 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.