Dimensions mm · values as the standard states them Recess H Recess Z
Size P dk m m b a r t t f recess_no rf x M1.6 0.35 3
2.75 – 3
≈ 1.9
≈ 1.8
≥ 15
≤ 0.7
≤ 0.4
0.74 – 1.1
0.89 – 1.14
≤ 0.96
0
≈ 3
≤ 0.9
M2 0.4 3.8
3.5 – 3.8
≈ 2.5
≈ 2.4
≥ 16
≤ 0.8
≤ 0.5
1.1 – 1.4
1.04 – 1.35
≤ 1.2
1
≈ 4
≤ 1
M2.5 0.45 4.7
4.4 – 4.7
≈ 2.7
≈ 2.8
≥ 18
≤ 0.9
≤ 0.7
1.3 – 1.6
1.5 – 1.75
≤ 1.5
1
≈ 5
≤ 1.1
M3 0.5 5.6
5.3 – 5.6
≈ 3.1
≈ 3.1
≥ 19
≤ 1
≤ 0.8
1.7 – 2
1.83 – 2.08
≤ 1.65
1
≈ 6
≤ 1.25
(M3.5) 0.6 6.5
6.14 – 6.5
≈ 4.2
≈ 4.3
≥ 20
≤ 1.2
≤ 0.95
1.74 – 2.24
1.93 – 2.39
≤ 1.93
2
≈ 7
≤ 1.5
M4 0.7 7.5
7.14 – 7.5
≈ 4.5
≈ 4.6
≥ 22
≤ 1.4
≤ 1
2.04 – 2.54
2.26 – 2.72
≤ 2.2
2
≈ 8
≤ 1.75
M5 0.8 9.2
8.84 – 9.2
≈ 5.3
≈ 5.3
≥ 25
≤ 1.6
≤ 1.3
2.77 – 3.27
2.89 – 3.35
≤ 2.5
2
≈ 10
≤ 2
M6 1 11
10.57 – 11
≈ 6.8
≈ 7
≥ 28
≤ 2
≤ 1.6
3.03 – 3.53
3.3 – 3.76
≤ 3
3
≈ 12
≤ 2.5
M8 1.25 14.5
14.07 – 14.5
≈ 9
≈ 8.8
≥ 34
≤ 2.5
≤ 2
4.18 – 4.68
4.06 – 4.52
≤ 4
4
≈ 16
≤ 3.2
M10 1.5 18
17.57 – 18
≈ 10
≈ 9.9
≥ 40
≤ 3
≤ 2.5
5.38 – 5.88
5.28 – 5.74
≤ 5
4
≈ 20
≤ 3.8
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.
Length tolerances 3 2.8 – 3.2
4 3.75 – 4.25
5 4.75 – 5.25
6 5.75 – 6.25
8 7.7 – 8.3
10 9.7 – 10.3
12 11.65 – 12.35
14 13.65 – 14.35
16 15.65 – 16.35
18 17.65 – 18.35
20 19.6 – 20.4
22 21.6 – 22.4
25 24.6 – 25.4
28 27.6 – 28.4
30 29.6 – 30.4
35 34.5 – 35.5
40 39.5 – 40.5
45 44.5 – 45.5
50 49.5 – 50.5
55 54 – 56
60 59 – 61
Size sheet · DIN 966
M1.6
dk head diameter 3
m ≈ 1.9
m ≈ 1.8
b thread length ≥ 15
a ≤ 0.7
r fillet radius ≤ 0.4
t 0.74 – 1.1
t 0.89 – 1.14
f height of the lens ≤ 0.96
recess_no drive size 0
rf ≈ 3
x ≤ 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 Standard lengths
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16
Size sheet · DIN 966
M2
dk head diameter 3.8
m ≈ 2.5
m ≈ 2.4
b thread length ≥ 16
a ≤ 0.8
r fillet radius ≤ 0.5
t 1.1 – 1.4
t 1.04 – 1.35
f height of the lens ≤ 1.2
recess_no drive size 1
rf ≈ 4
x ≤ 1 Thread · ISO 261/262
Pitch P 0.4
d2 1.74
d3 1.509
Tap drill 1.6
Stress area As 2.07 mm² Standard lengths
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20
Size sheet · DIN 966
M2.5
dk head diameter 4.7
m ≈ 2.7
m ≈ 2.8
b thread length ≥ 18
a ≤ 0.9
r fillet radius ≤ 0.7
t 1.3 – 1.6
t 1.5 – 1.75
f height of the lens ≤ 1.5
recess_no drive size 1
rf ≈ 5
x ≤ 1.1 Thread · ISO 261/262
Pitch P 0.45
d2 2.208
d3 1.948
Tap drill 2.05
Stress area As 3.39 mm² Standard lengths
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25
Size sheet · DIN 966
M3
dk head diameter 5.6
m ≈ 3.1
m ≈ 3.1
b thread length ≥ 19
a ≤ 1
r fillet radius ≤ 0.8
t 1.7 – 2
t 1.83 – 2.08
f height of the lens ≤ 1.65
recess_no drive size 1
rf ≈ 6
x ≤ 1.25 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Standard lengths
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30
Size sheet · DIN 966
M3.5
dk head diameter 6.5
m ≈ 4.2
m ≈ 4.3
b thread length ≥ 20
a ≤ 1.2
r fillet radius ≤ 0.95
t 1.74 – 2.24
t 1.93 – 2.39
f height of the lens ≤ 1.93
recess_no drive size 2
rf ≈ 7
x ≤ 1.5 Thread · ISO 261/262
Pitch P 0.6
d2 3.11
d3 2.764
Tap drill 2.9
Stress area As 6.78 mm² Standard lengths
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35
Size sheet · DIN 966
M4
dk head diameter 7.5
m ≈ 4.5
m ≈ 4.6
b thread length ≥ 22
a ≤ 1.4
r fillet radius ≤ 1
t 2.04 – 2.54
t 2.26 – 2.72
f height of the lens ≤ 2.2
recess_no drive size 2
rf ≈ 8
x ≤ 1.75 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40
Size sheet · DIN 966
M5
dk head diameter 9.2
m ≈ 5.3
m ≈ 5.3
b thread length ≥ 25
a ≤ 1.6
r fillet radius ≤ 1.3
t 2.77 – 3.27
t 2.89 – 3.35
f height of the lens ≤ 2.5
recess_no drive size 2
rf ≈ 10
x ≤ 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 Standard lengths
6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50
Size sheet · DIN 966
M6
dk head diameter 11
m ≈ 6.8
m ≈ 7
b thread length ≥ 28
a ≤ 2
r fillet radius ≤ 1.6
t 3.03 – 3.53
t 3.3 – 3.76
f height of the lens ≤ 3
recess_no drive size 3
rf ≈ 12
x ≤ 2.5 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50
Size sheet · DIN 966
M8
dk head diameter 14.5
m ≈ 9
m ≈ 8.8
b thread length ≥ 34
a ≤ 2.5
r fillet radius ≤ 2
t 4.18 – 4.68
t 4.06 – 4.52
f height of the lens ≤ 4
recess_no drive size 4
rf ≈ 16
x ≤ 3.2 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Standard lengths
10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55
Size sheet · DIN 966
M10
dk head diameter 18
m ≈ 10
m ≈ 9.9
b thread length ≥ 40
a ≤ 3
r fillet radius ≤ 2.5
t 5.38 – 5.88
t 5.28 – 5.74
f height of the lens ≤ 5
recess_no drive size 4
rf ≈ 20
x ≤ 3.8 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Standard lengths
12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55 · 60
Provenance
Draft — values taken from a single source and not yet cross-checked.
Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (1) The source publishes one identical table for DIN 966, ISO 7047. It does not match the official ISO 7047 preview, so it is kept as the DIN table.