Dimensions mm · values as the standard states them Size P t n df dp z M1.6 0.35 0.56 – 0.74
0.25
0.31 – 0.45
Thread-corediameter
0.55 – 0.8
0.8 – 1.05
M2 0.4 0.64 – 0.84
0.25
0.31 – 0.45
Thread-corediameter
0.75 – 1
1 – 1.25
M2.5 0.45 0.72 – 0.95
0.4
0.46 – 0.6
Thread-corediameter
1.25 – 1.5
1.25 – 1.5
M3 0.5 0.8 – 10.5
0.4
0.46 – 0.6
Thread-corediameter
1.75 – 2
1.5 – 1.75
(M3.5) 0.6 0.96 – 1.21
0.5
0.56 – 0.7
Thread-corediameter
1.95 – 2.2
1.75 – 2
M4 0.7 1.12 – 1.42
0.6
0.66 – 0.8
Thread-corediameter
2.25 – 2.5
2 – 2.25
M5 0.8 1.28 – 1.63
0.8
0.86 – 1
Thread-corediameter
3.2 – 3.5
2.5 – 2.75
M6 1 1.6 – 2
1
1.06 – 1.2
Thread-corediameter
3.7 – 4
3 – 3.25
M8 1.25 2 – 2.5
1.2
0.26 – 1.51
Thread-corediameter
5.2 – 5.5
4 – 4.3
M10 1.5 2.4 – 3
1.6
1.66 – 1.91
Thread-corediameter
6.64 – 7
5 – 5.3
M12 1.75 2.8 – 3.6
2
2.06 – 2.31
Thread-corediameter
8.14 – 8.5
6 – 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
2.5 2.3 – 2.7
3 2.8 – 3.2
4 3.75 – 4.25
5 4.75 – 5.25
6 5.7 – 6.3
8 7.7 – 8.3
10 9.7 – 10.3
12 11.6 – 12.4
14 13.6 – 14.4
16 15.6 – 16.4
20 19.6 – 20.4
25 24.6 – 25.4
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 54.4 – 55.6
60 59.4 – 60.6
Size sheet · ISO 7435
M1.6
t 0.56 – 0.74
n groove width 0.25
df average diameter of thread Thread-corediameter
dp diameter of the ejector 0.55 – 0.8
z length of the ejector 0.8 – 1.05 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 · ISO 7435
M2
t 0.64 – 0.84
n groove width 0.25
df average diameter of thread Thread-corediameter
dp diameter of the ejector 0.75 – 1
z length of the ejector 1 – 1.25 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
Size sheet · ISO 7435
M2.5
t 0.72 – 0.95
n groove width 0.4
df average diameter of thread Thread-corediameter
dp diameter of the ejector 1.25 – 1.5
z length of the ejector 1.25 – 1.5 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
4 · 5 · 6 · 8
Size sheet · ISO 7435
M3
t 0.8 – 10.5
n groove width 0.4
df average diameter of thread Thread-corediameter
dp diameter of the ejector 1.75 – 2
z length of the ejector 1.5 – 1.75 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
5 · 6 · 8 · 10 · 12
Size sheet · ISO 7435
M3.5
t 0.96 – 1.21
n groove width 0.5
df average diameter of thread Thread-corediameter
dp diameter of the ejector 1.95 – 2.2
z length of the ejector 1.75 – 2 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
5 · 6 · 8 · 10 · 12 · 14 · 16
Size sheet · ISO 7435
M4
t 1.12 – 1.42
n groove width 0.6
df average diameter of thread Thread-corediameter
dp diameter of the ejector 2.25 – 2.5
z length of the ejector 2 – 2.25 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
6 · 8 · 10 · 12 · 14 · 16
Size sheet · ISO 7435
M5
t 1.28 – 1.63
n groove width 0.8
df average diameter of thread Thread-corediameter
dp diameter of the ejector 3.2 – 3.5
z length of the ejector 2.5 – 2.75 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
8 · 10 · 12 · 14 · 16
Size sheet · ISO 7435
M6
t 1.6 – 2
n groove width 1
df average diameter of thread Thread-corediameter
dp diameter of the ejector 3.7 – 4
z length of the ejector 3 – 3.25 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 · 20
Size sheet · ISO 7435
M8
t 2 – 2.5
n groove width 1.2
df average diameter of thread Thread-corediameter
dp diameter of the ejector 5.2 – 5.5
z length of the ejector 4 – 4.3 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 · 20 · 25
Size sheet · ISO 7435
M10
t 2.4 – 3
n groove width 1.6
df average diameter of thread Thread-corediameter
dp diameter of the ejector 6.64 – 7
z length of the ejector 5 – 5.3 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Standard lengths
12 · 14 · 16 · 20 · 25 · 30 · 35
Size sheet · ISO 7435
M12
t 2.8 – 3.6
n groove width 2
df average diameter of thread Thread-corediameter
dp diameter of the ejector 8.14 – 8.5
z length of the ejector 6 – 6.3 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² 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 417, ISO 7435. The DIN and ISO versions are dimensionally identical per the Würth DIN→ISO changeover table; not independently verified against the ISO preview. M1.6 n: min/max labels swapped in the source table — corrected.