Dimensions mm · values as the standard states them Size P ds s k h b dc M5 0.8 ≤ 5
≤ 7
≤ 5.6
≥ 1
≥ 16
≤ 11.4
M6 1 ≤ 6
≤ 8
≤ 6.9
≥ 1.1
≥ 18
≤ 13.6
M8 1.25 ≤ 8
≤ 10
≤ 8.5
≥ 1.2
≥ 22
≤ 17
M10 1.5 ≤ 10
≤ 13
≤ 9.7
≥ 1.5
≥ 26
≤ 20.8
M12 1.75 ≤ 12
≤ 15
≤ 12.1
≥ 1.8
≥ 30
≤ 24.7
M16 2 ≤ 16
≤ 21
≤ 15.2
≥ 2.4
≥ 38
≤ 32.8
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 15071
M5
ds shank diameter ≤ 5
s width across flats ≤ 7
k head height ≤ 5.6
h height washers ≥ 1
b thread length ≥ 16
dc outer diameter of the ring ≤ 11.4 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 15071
M6
ds shank diameter ≤ 6
s width across flats ≤ 8
k head height ≤ 6.9
h height washers ≥ 1.1
b thread length ≥ 18
dc outer diameter of the ring ≤ 13.6 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 15071
M8
ds shank diameter ≤ 8
s width across flats ≤ 10
k head height ≤ 8.5
h height washers ≥ 1.2
b thread length ≥ 22
dc outer diameter of the ring ≤ 17 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 15071
M10
ds shank diameter ≤ 10
s width across flats ≤ 13
k head height ≤ 9.7
h height washers ≥ 1.5
b thread length ≥ 26
dc outer diameter of the ring ≤ 20.8 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Size sheet · ISO 15071
M12
ds shank diameter ≤ 12
s width across flats ≤ 15
k head height ≤ 12.1
h height washers ≥ 1.8
b thread length ≥ 30
dc outer diameter of the ring ≤ 24.7 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Size sheet · ISO 15071
M16
ds shank diameter ≤ 16
s width across flats ≤ 21
k head height ≤ 15.2
h height washers ≥ 2.4
b thread length ≥ 38
dc outer diameter of the ring ≤ 32.8 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 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 15071:2011 preview — values match.