Dimensions mm · values as the standard states them Size P d d1 b a L1 L2 M8 1.25 8.5
7.5 – 8.5
68
9
125
28.75
M10 1.5 8.5
7.5 – 8.5
82
10.7
139
29.25
M12 1.75 10.5
9.5 – 10.5
90
15.5
160
44.75
M16 2 12.5
9.5 – 10.5
102
20
186
45.25
M20 2.5 17
11.5 – 12.5
115
23.5
205
59.5
M24 3 20.5
11.5 – 12.5
125
29
240
62.75
M30 3.5 25
15.5 – 16.5
150
34
290
89.5
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 1478 JJ
M8
d diameter pin 8.5
d1 hole diameter 7.5 – 8.5
b length of thread 68
a width 9
L1 length 125
L2 length 28.75 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 1478 JJ
M10
d diameter pin 8.5
d1 hole diameter 7.5 – 8.5
b length of thread 82
a width 10.7
L1 length 139
L2 length 29.25 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 1478 JJ
M12
d diameter pin 10.5
d1 hole diameter 9.5 – 10.5
b length of thread 90
a width 15.5
L1 length 160
L2 length 44.75 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 1478 JJ
M16
d diameter pin 12.5
d1 hole diameter 9.5 – 10.5
b length of thread 102
a width 20
L1 length 186
L2 length 45.25 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 1478 JJ
M20
d diameter pin 17
d1 hole diameter 11.5 – 12.5
b length of thread 115
a width 23.5
L1 length 205
L2 length 59.5 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 1478 JJ
M24
d diameter pin 20.5
d1 hole diameter 11.5 – 12.5
b length of thread 125
a width 29
L1 length 240
L2 length 62.75 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 1478 JJ
M30
d diameter pin 25
d1 hole diameter 15.5 – 16.5
b length of thread 150
a width 34
L1 length 290
L2 length 89.5 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.