Dimensions mm · values as the standard states them Size P e k a l_minus_b M6 1 10-0,5
4-0,5
6
-0,3/-0,5
63-40
M8 1.25 13
6
8
-0,3/-0,5
80-50
M10 1.5 15
6
10
-0,3/-0,5
100-60
M12 1.75 22
8
14
-0,3/-0,5
200-120
M16 2 28
10
18
-0,3/-0,5
250-150
M20 2.5 35
14
22
-0,3/-0,5
200-125
M24 3 44-1
18-1
28
-0,3/-0,5
250-150
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 787
M6
e width across corners 10-0,5
k head height 4-0,5
a average flow heads 6
l_minus_b 63-40 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 787
M8
e width across corners 13
k head height 6
a average flow heads 8
l_minus_b 80-50 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 787
M10
e width across corners 15
k head height 6
a average flow heads 10
l_minus_b 100-60 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 787
M12
e width across corners 22
k head height 8
a average flow heads 14
l_minus_b 200-120 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 787
M16
e width across corners 28
k head height 10
a average flow heads 18
l_minus_b 250-150 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Size sheet · DIN 787
M20
e width across corners 35
k head height 14
a average flow heads 22
l_minus_b 200-125 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² Size sheet · DIN 787
M24
e width across corners 44-1
k head height 18-1
a average flow heads 28
l_minus_b 250-150 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 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 Otto Roth status Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.