Dimensions mm · values as the standard states them Size P s e k a r M6 1 9
10.4
4
≤ 2.5
0.3
M8 1.25 12
13.8
5
≤ 3
0.5
M10 1.5 14
16.2
6
≤ 4
0.5
M12 1.75 17
19.6
7
≤ 4
1
M16 2 22
25.4
9
≤ 4.5
1
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 · DIN 70614
M6
s width across flats 9
e width across corners 10.4
k head height 4
a length undercut ≤ 2.5
r fillet radius 0.3 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Size sheet · DIN 70614
M8
s width across flats 12
e width across corners 13.8
k head height 5
a length undercut ≤ 3
r fillet radius 0.5 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Size sheet · DIN 70614
M10
s width across flats 14
e width across corners 16.2
k head height 6
a length undercut ≤ 4
r fillet radius 0.5 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Size sheet · DIN 70614
M12
s width across flats 17
e width across corners 19.6
k head height 7
a length undercut ≤ 4
r fillet radius 1 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 · DIN 70614
M16
s width across flats 22
e width across corners 25.4
k head height 9
a length undercut ≤ 4.5
r fillet radius 1 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Provenance
Draft — values taken from a single source and not yet cross-checked.
fasteners.eu dimensions, lengths, materials, property classes, current norm, equivalent norms Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (1) Status (active/withdrawn) could not be confirmed from the sources used.