Dimensions mm · values as the standard states them Size P m h d2 d3 M12 1.75 22
45
12
30
M16 2 25
48
14
35
M20 2.5 28
50
16
40
M24 3 35
58
20
50
M27 3 35
58
20
50
M30 3.5 35
58
20
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 · DIN 28129
M12
m nut height 22
h height in the center of the eye 45
d2 diameter of the eye 12
d3 diameter of the collar 30 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 28129
M16
m nut height 25
h height in the center of the eye 48
d2 diameter of the eye 14
d3 diameter of the collar 35 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 28129
M20
m nut height 28
h height in the center of the eye 50
d2 diameter of the eye 16
d3 diameter of the collar 40 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 28129
M24
m nut height 35
h height in the center of the eye 58
d2 diameter of the eye 20
d3 diameter of the collar 50 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Size sheet · DIN 28129
M27
m nut height 35
h height in the center of the eye 58
d2 diameter of the eye 20
d3 diameter of the collar 50 Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Size sheet · DIN 28129
M30
m nut height 35
h height in the center of the eye 58
d2 diameter of the eye 20
d3 diameter of the collar 50 Thread · ISO 261/262
Pitch P 3.5
d2 27.727
d3 25.706
Tap drill 26.5
Stress area As 560.59 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.