Head · drive Headless · Slot
Thread Metric ISO coarse thread, full length
Tolerance up to size M1,4 - 6h, from size M1,6 - 6g
Property classes 14H 22H A1 A4
Materials Steel Stainless Brass
Dimensions mm · values as the standard states them Size P t n df dt M1 0.25 0.4
0.4 – 0.52
0.2
0.26 – 0.4
≈ Minorthreaddiameter
≤ 0.1
M1.2 0.25 0.4
0.4 – 0.52
0.2
0.26 – 0.4
≈ Minorthreaddiameter
≤ 0.12
M1.4 0.3 0.48
0.48 – 0.63
0.2
0.26 – 0.4
≈ Minorthreaddiameter
≤ 0.14
M1.6 0.35 0.56
0.56 – 0.74
0.25
0.31 – 0.45
≈ Minorthreaddiameter
≤ 0.16
M2 0.4 0.64
0.64 – 0.84
0.25
0.31 – 0.45
≈ Minorthreaddiameter
≤ 0.2
M2.5 0.45 0.72
0.72 – 0.95
0.4
0.46 – 0.6
≈ Minorthreaddiameter
≤ 0.25
M3 0.5 0.8
0.8 – 1.05
0.4
0.46 – 0.6
≈ Minorthreaddiameter
≤ 0.3
(M3.5) 0.6 0.96
0.96 – 1.21
0.5
0.56 – 0.7
≈ Minorthreaddiameter
≤ 0.35
M4 0.7 1.12
1.12 – 1.42
0.6
0.66 – 0.8
≈ Minorthreaddiameter
≤ 0.4
M5 0.8 1.25
1.25 – 1.63
0.8
0.86 – 1
≈ Minorthreaddiameter
≤ 0.5
M6 1 1.6
1.6 – 2
1
1.06 – 1.2
≈ Minorthreaddiameter
≤ 1.5
M8 1.25 2
2 – 2.5
1.2
1.26 – 1.51
≈ Minorthreaddiameter
≤ 2
M10 1.5 2.4
2.4 – 3
1.6
1.66 – 1.91
≈ Minorthreaddiameter
≤ 2.5
M12 1.75 2.8
2.8 – 3.6
2
2.06 – 2.31
≈ Minorthreaddiameter
≤ 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 3.7 – 4.3
5 4.7 – 5.3
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 7434
M1
t groove depth 0.4
n groove width 0.2
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.1 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 · 2.5 · 3 · 4 · 5
Size sheet · ISO 7434
M1.2
t groove depth 0.4
n groove width 0.2
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.12 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 · 2.5 · 3 · 4 · 5 · 6
Size sheet · ISO 7434
M1.4
t groove depth 0.48
n groove width 0.2
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.14 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 · 2.5 · 3 · 4 · 5 · 6 · 8
Size sheet · ISO 7434
M1.6
t groove depth 0.56
n groove width 0.25
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.16 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 · 2.5 · 3 · 4 · 5 · 6 · 8
Size sheet · ISO 7434
M2
t groove depth 0.64
n groove width 0.25
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.2 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
Size sheet · ISO 7434
M2.5
t groove depth 0.72
n groove width 0.4
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.25 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
Size sheet · ISO 7434
M3
t groove depth 0.8
n groove width 0.4
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.3 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Standard lengths
4 · 5 · 6 · 8 · 10 · 12 · 14
Size sheet · ISO 7434
M3.5
t groove depth 0.96
n groove width 0.5
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.35 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 · 20
Size sheet · ISO 7434
M4
t groove depth 1.12
n groove width 0.6
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.4 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 · 20
Size sheet · ISO 7434
M5
t groove depth 1.25
n groove width 0.8
df ≈ Minorthreaddiameter
dt tip diameter ≤ 0.5 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 · 20 · 25
Size sheet · ISO 7434
M6
t groove depth 1.6
n groove width 1
df ≈ Minorthreaddiameter
dt tip diameter ≤ 1.5 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 · 20 · 25 · 30
Size sheet · ISO 7434
M8
t groove depth 2
n groove width 1.2
df ≈ Minorthreaddiameter
dt tip diameter ≤ 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 · 20 · 25 · 30 · 35 · 40
Size sheet · ISO 7434
M10
t groove depth 2.4
n groove width 1.6
df ≈ Minorthreaddiameter
dt tip diameter ≤ 2.5 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 · 40 · 45 · 50
Size sheet · ISO 7434
M12
t groove depth 2.8
n groove width 2
df ≈ Minorthreaddiameter
dt tip diameter ≤ 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 Standard lengths
14 · 16 · 20 · 25 · 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 553, ISO 7434. The DIN and ISO versions are dimensionally identical per the Würth DIN→ISO changeover table; not independently verified against the ISO preview.