Dimensions mm · values as the standard states them Size P ds dk k b t A recess_no hexalobular M3 0.5 ≤ 3
≤ 6.57
≤ 2.2
18
≤ 1.18
2.8
10
M4 0.7 ≤ 4
≤ 9.02
≤ 3.01
20
≤ 169
3.95
20
M5 0.8 ≤ 5
≤ 10.9
≤ 3.5
22
≤ 1.89
4.5
25
M6 1 ≤ 6
≤ 13.2
≤ 4.22
24
≤ 2.22
5.6
30
M8 1.25 ≤ 8
≤ 17.9
≤ 5.69
28
≤ 2.99
7.93
45
M10 1.5 ≤ 10
≤ 21.3
≤ 6.5
32
≤ 3.3
8.95
50
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.
Size sheet · ISO 14582
M3
ds shank diameter ≤ 3
dk head diameter ≤ 6.57
k head height ≤ 2.2
b thread length 18
t groove depth ≤ 1.18
A 2.8
recess_no drive size (hexalobular) 10 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Size sheet · ISO 14582
M4
ds shank diameter ≤ 4
dk head diameter ≤ 9.02
k head height ≤ 3.01
b thread length 20
t groove depth ≤ 169
A 3.95
recess_no drive size (hexalobular) 20 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Size sheet · ISO 14582
M5
ds shank diameter ≤ 5
dk head diameter ≤ 10.9
k head height ≤ 3.5
b thread length 22
t groove depth ≤ 1.89
A 4.5
recess_no drive size (hexalobular) 25 Thread · ISO 261/262
Pitch P 0.8
d2 4.48
d3 4.019
Tap drill 4.2
Stress area As 14.18 mm² Size sheet · ISO 14582
M6
ds shank diameter ≤ 6
dk head diameter ≤ 13.2
k head height ≤ 4.22
b thread length 24
t groove depth ≤ 2.22
A 5.6
recess_no drive size (hexalobular) 30 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Size sheet · ISO 14582
M8
ds shank diameter ≤ 8
dk head diameter ≤ 17.9
k head height ≤ 5.69
b thread length 28
t groove depth ≤ 2.99
A 7.93
recess_no drive size (hexalobular) 45 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Size sheet · ISO 14582
M10
ds shank diameter ≤ 10
dk head diameter ≤ 21.3
k head height ≤ 6.5
b thread length 32
t groove depth ≤ 3.3
A 8.95
recess_no drive size (hexalobular) 50 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² 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 (1) Dimensions cross-checked against the official ISO 14582:2013 preview — values match.