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 dp M1 0.25 0.4 – 0.52
0.2
0.26 – 0.4
Minorthreaddiameter
0.25 – 0.5
M1.2 0.25 0.4 – 0.52
0.2
0.26 – 0.4
Minorthreaddiameter
0.35 – 0.6
M1.4 0.3 0.48 – 0.63
0.2
0.26 – 0.4
Minorthreaddiameter
0.45 – 0.7
M1.6 0.35 0.56 – 0.74
0.25
0.31 – 0.45
Minorthreaddiameter
0.55 – 0.8
M2 0.4 0.64 – 0.84
0.25
0.31 – 0.45
Minorthreaddiameter
0.75 – 1
M2.5 0.45 0.72 – 0.95
0.4
0.46 – 0.6
Minorthreaddiameter
1.25 – 1.5
M3 0.5 0.8 – 1.05
0.4
0.46 – 0.6
Minorthreaddiameter
1.75 – 2
(M3.5) 0.6 0.96 – 1.21
0.5
0.56 – 0.7
Minorthreaddiameter
1.95 – 2.2
M4 0.7 1.12 – 1.45
0.6
0.66 – 0.8
Minorthreaddiameter
2.25 – 2.5
M5 0.8 1.28 – 1.63
0.8
0.86 – 1
Minorthreaddiameter
3.2 – 3.5
M6 1 1.6 – 2
1
1.06 – 1.2
Minorthreaddiameter
3.7 – 4
M8 1.25 2 – 2.5
1.2
1.26 – 1.51
Minorthreaddiameter
5.2 – 5.5
M10 1.5 2.4 – 3
1.6
1.66 – 1.91
Minorthreaddiameter
6.67 – 7
M12 1.75 2.8 – 3.6
2
2.06 – 2.31
Minorthreaddiameter
8.14 – 8.5
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 4766
M1
t 0.4 – 0.52
n 0.2
df Minorthreaddiameter
dp 0.25 – 0.5 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 4766
M1.2
t 0.4 – 0.52
n 0.2
df Minorthreaddiameter
dp 0.35 – 0.6 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 4766
M1.4
t 0.48 – 0.63
n 0.2
df Minorthreaddiameter
dp 0.45 – 0.7 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 4766
M1.6
t 0.56 – 0.74
n 0.25
df Minorthreaddiameter
dp 0.55 – 0.8 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 4766
M2
t 0.64 – 0.84
n 0.25
df Minorthreaddiameter
dp 0.75 – 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
2 · 2.5 · 3 · 4 · 5 · 6 · 8 · 10
Size sheet · ISO 4766
M2.5
t 0.72 – 0.95
n 0.4
df Minorthreaddiameter
dp 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
2.5 · 3 · 4 · 5 · 6 · 8 · 10 · 12
Size sheet · ISO 4766
M3
t 0.8 – 1.05
n 0.4
df Minorthreaddiameter
dp 1.75 – 2 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
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16
Size sheet · ISO 4766
M3.5
t 0.96 – 1.21
n 0.5
df Minorthreaddiameter
dp 1.95 – 2.2 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
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 20
Size sheet · ISO 4766
M4
t 1.12 – 1.45
n 0.6
df Minorthreaddiameter
dp 2.25 – 2.5 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
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25
Size sheet · ISO 4766
M5
t 1.28 – 1.63
n 0.8
df Minorthreaddiameter
dp 3.2 – 3.5 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
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30
Size sheet · ISO 4766
M6
t 1.6 – 2
n 1
df Minorthreaddiameter
dp 3.7 – 4 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30
Size sheet · ISO 4766
M8
t 2 – 2.5
n 1.2
df Minorthreaddiameter
dp 5.2 – 5.5 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
6 · 8 · 10 · 12 · 14 · 16 · 20 · 25 · 30 · 35
Size sheet · ISO 4766
M10
t 2.4 – 3
n 1.6
df Minorthreaddiameter
dp 6.67 – 7 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
10 · 12 · 14 · 16 · 20 · 25 · 30 · 35 · 40 · 45 · 50
Size sheet · ISO 4766
M12
t 2.8 – 3.6
n 2
df Minorthreaddiameter
dp 8.14 – 8.5 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
12 · 14 · 16 · 20 · 25 · 30 · 35 · 40 · 45 · 50 · 55 · 60
Provenance
Reviewed — dimensions cross-checked against the official ISO preview; values match.
Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (3) Dimensions cross-checked against the official ISO 4766:2011 preview — values match. The source publishes one identical table for DIN 551, ISO 4766. M1 n: min/max labels swapped in the source table — corrected.