Dimensions mm · values as the standard states them Size P dk k b a r t n x M1 0.25 1.9
1.76 – 1.9
≤ 0.6
≥ fullthread
≤ 0.5
≤ 0.1
0.2 – 0.3
0.25
0.31 – 0.45
—
M1.2 0.25 2.3
2.06 – 2.3
≤ 0.72
≥ fullthread
≤ 0.5
≤ 0.12
0.25 – 0.35
0.3
0.36 – 0.5
—
M1.4 0.3 2.6
2.46 – 2.6
≤ 0.86
≥ fullthread
≤ 0.6
≤ 0.14
0.28 – 0.4
0.3
0.36 – 0.5
—
M1.6 0.35 3
2.86 – 3
≤ 0.96
≥ 15
≤ 0.7
≤ 0.16
0.32 – 0.45
0.4
0.46 – 0.6
≤ 0.9
M2 0.4 3.8
3.5 – 3.8
≤ 1.2
≥ 16
≤ 0.8
≤ 0.2
0.4 – 0.6
0.5
0.56 – 0.7
≤ 1
M2.5 0.45 4.7
4.4 – 4.7
≤ 1.5
≥ 18
≤ 0.9
≤ 0.25
0.5 – 0.7
0.6
0.66 – 0.8
≤ 1.1
M3 0.5 5.6
5.3 – 5.6
≤ 1.65
≥ 19
≤ 1
≤ 0.3
0.6 – 0.85
0.8
0.86 – 1
≤ 1.25
(M3.5) 0.6 6.5
6.14 – 6.5
≤ 1.93
≥ 20
≤ 1.2
≤ 0.35
0.7 – 1
0.8
0.96 – 1
≤ 1.5
M4 0.7 7.5
7.14 – 7.5
≤ 2.2
≥ 22
≤ 1.4
≤ 0.4
0.8 – 1.1
1
1.06 – 1.2
≤ 1.75
M5 0.8 9.2
8.84 – 9.2
≤ 2.5
≥ 25
≤ 1.6
≤ 0.5
1 – 1.3
1.2
1.26 – 1.51
≤ 2
M6 1 11
10.57 – 11
≤ 3
≥ 28
≤ 2
≤ 0.6
1.2 – 1.6
1.6
1.66 – 1.91
≤ 2.5
M8 1.25 14.5
14.07 – 14.5
≤ 4
≥ 34
≤ 2.5
≤ 0.8
1.6 – 2.1
2
2.06 – 2.31
≤ 3.2
M10 1.5 18
17.57 – 18
≤ 5
≥ 40
≤ 3
≤ 1
2 – 2.6
2.5
2.56 – 2.81
≤ 3.8
M12 1.75 22
21.48 – 22
≤ 6
≥ 46
≤ 3.5
≤ 1.2
2.4 – 3
3
3.06 – 3.31
≤ 4.4
(M14) 2 25
24.48 – 25
≤ 7
≥ 52
≤ 4
≤ 1.4
2.8 – 3.5
3
3.06 – 3.31
≤ 5
M16 2 29
28.48 – 29
≤ 8
≥ 58
≤ 4
≤ 1.6
3.2 – 4
4
4.07 – 4.37
≤ 5
(M18) 2.5 33
32.38 – 33
≤ 9
≥ 64
≤ 5
≤ 1.8
3.6 – 4.5
4
4.07 – 4.37
≤ 6.3
M20 2.5 36
35.38 – 36
≤ 10
≥ 70
≤ 5
≤ 2
4 – 5
5
5.07 – 5.37
≤ 6.3
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.
Length tolerances 2 1.8 – 2.2
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
70 69 – 71
80 79 – 81
90 89 – 91
100 99 – 101
Size sheet · DIN 963
M1
dk head diameter 1.9
k head height ≤ 0.6
b thread length ≥ fullthread
a ≤ 0.5
r fillet radius ≤ 0.1
t groove depth 0.2 – 0.3
n groove width 0.25 Thread · ISO 261/262
Pitch P 0.25
d2 0.838
d3 0.693
Tap drill 0.75
Stress area As 0.46 mm² Standard lengths
2 · 3 · 4 · 5
Size sheet · DIN 963
M1.2
dk head diameter 2.3
k head height ≤ 0.72
b thread length ≥ fullthread
a ≤ 0.5
r fillet radius ≤ 0.12
t groove depth 0.25 – 0.35
n groove width 0.3 Thread · ISO 261/262
Pitch P 0.25
d2 1.038
d3 0.893
Tap drill 0.95
Stress area As 0.73 mm² Standard lengths
2 · 3 · 4 · 5 · 6
Size sheet · DIN 963
M1.4
dk head diameter 2.6
k head height ≤ 0.86
b thread length ≥ fullthread
a ≤ 0.6
r fillet radius ≤ 0.14
t groove depth 0.28 – 0.4
n groove width 0.3 Thread · ISO 261/262
Pitch P 0.3
d2 1.205
d3 1.032
Tap drill 1.1
Stress area As 0.98 mm² Standard lengths
2 · 3 · 4 · 5 · 6 · 8 · 10
Size sheet · DIN 963
M1.6
dk head diameter 3
k head height ≤ 0.96
b thread length ≥ 15
a ≤ 0.7
r fillet radius ≤ 0.16
t groove depth 0.32 – 0.45
n groove width 0.4
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
2 · 3 · 4 · 5 · 6 · 8 · 10
Size sheet · DIN 963
M2
dk head diameter 3.8
k head height ≤ 1.2
b thread length ≥ 16
a ≤ 0.8
r fillet radius ≤ 0.2
t groove depth 0.4 – 0.6
n groove width 0.5
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
Size sheet · DIN 963
M2.5
dk head diameter 4.7
k head height ≤ 1.5
b thread length ≥ 18
a ≤ 0.9
r fillet radius ≤ 0.25
t groove depth 0.5 – 0.7
n groove width 0.6
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 963
M3
dk head diameter 5.6
k head height ≤ 1.65
b thread length ≥ 19
a ≤ 1
r fillet radius ≤ 0.3
t groove depth 0.6 – 0.85
n groove width 0.8
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 963
M3.5
dk head diameter 6.5
k head height ≤ 1.93
b thread length ≥ 20
a ≤ 1.2
r fillet radius ≤ 0.35
t groove depth 0.7 – 1
n groove width 0.8
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 963
M4
dk head diameter 7.5
k head height ≤ 2.2
b thread length ≥ 22
a ≤ 1.4
r fillet radius ≤ 0.4
t groove depth 0.8 – 1.1
n groove width 1
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 963
M5
dk head diameter 9.2
k head height ≤ 2.5
b thread length ≥ 25
a ≤ 1.6
r fillet radius ≤ 0.5
t groove depth 1 – 1.3
n groove width 1.2
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 963
M6
dk head diameter 11
k head height ≤ 3
b thread length ≥ 28
a ≤ 2
r fillet radius ≤ 0.6
t groove depth 1.2 – 1.6
n groove width 1.6
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 963
M8
dk head diameter 14.5
k head height ≤ 4
b thread length ≥ 34
a ≤ 2.5
r fillet radius ≤ 0.8
t groove depth 1.6 – 2.1
n groove width 2
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 963
M10
dk head diameter 18
k head height ≤ 5
b thread length ≥ 40
a ≤ 3
r fillet radius ≤ 1
t groove depth 2 – 2.6
n groove width 2.5
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
Size sheet · DIN 963
M12
dk head diameter 22
k head height ≤ 6
b thread length ≥ 46
a ≤ 3.5
r fillet radius ≤ 1.2
t groove depth 2.4 – 3
n groove width 3
x ≤ 4.4 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Standard lengths
20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55 · 60 · 70 · 80
Size sheet · DIN 963
M14
dk head diameter 25
k head height ≤ 7
b thread length ≥ 52
a ≤ 4
r fillet radius ≤ 1.4
t groove depth 2.8 – 3.5
n groove width 3
x ≤ 5 Thread · ISO 261/262
Pitch P 2
d2 12.701
d3 11.546
Tap drill 12
Stress area As 115.44 mm² Standard lengths
22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55 · 60 · 70 · 80
Size sheet · DIN 963
M16
dk head diameter 29
k head height ≤ 8
b thread length ≥ 58
a ≤ 4
r fillet radius ≤ 1.6
t groove depth 3.2 – 4
n groove width 4
x ≤ 5 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Standard lengths
25 · 28 · 30 · 35 · 40 · 45 · 50 · 55 · 60 · 70 · 80 · 90 · 100
Size sheet · DIN 963
M18
dk head diameter 33
k head height ≤ 9
b thread length ≥ 64
a ≤ 5
r fillet radius ≤ 1.8
t groove depth 3.6 – 4.5
n groove width 4
x ≤ 6.3 Thread · ISO 261/262
Pitch P 2.5
d2 16.376
d3 14.933
Tap drill 15.5
Stress area As 192.47 mm² Standard lengths
28 · 30 · 35 · 40 · 45 · 50 · 55 · 60 · 70 · 80 · 90 · 100
Size sheet · DIN 963
M20
dk head diameter 36
k head height ≤ 10
b thread length ≥ 70
a ≤ 5
r fillet radius ≤ 2
t groove depth 4 – 5
n groove width 5
x ≤ 6.3 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² Standard lengths
30 · 35 · 40 · 45 · 50 · 55 · 60 · 70 · 80 · 90 · 100
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 (2) The source publishes one identical table for DIN 963, ISO 2009. It does not match the official ISO 2009 preview, so it is kept as the DIN table. M1 n: min/max labels swapped in the source table — corrected.