Dimensions mm · values as the standard states them Size P d1 b a L1 M6 1 5.7 – 6.3
50
9.5
77
M8 1.25 7.5 – 8.5
60
11
98
M10 1.5 7.5 – 8.5
73
14
116.5
M12 1.75 9.5 – 10.5
90
18
146
M16 2 9.5 – 10.5
100
19
165
M20 2.5 11.5 – 12.5
105
21
180
M24 3 11.5 – 12.5
135
29
225
M30 3.5 15.5 – 16.5
140
31
255
M36 4 15.5 – 16.5
170
35
300
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 HH
M6
d1 hole diameter 5.7 – 6.3
b length of thread 50
a opening Range 9.5
L1 length 77 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 1478 HH
M8
d1 hole diameter 7.5 – 8.5
b length of thread 60
a opening Range 11
L1 length 98 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 HH
M10
d1 hole diameter 7.5 – 8.5
b length of thread 73
a opening Range 14
L1 length 116.5 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 1478 HH
M12
d1 hole diameter 9.5 – 10.5
b length of thread 90
a opening Range 18
L1 length 146 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 HH
M16
d1 hole diameter 9.5 – 10.5
b length of thread 100
a opening Range 19
L1 length 165 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 HH
M20
d1 hole diameter 11.5 – 12.5
b length of thread 105
a opening Range 21
L1 length 180 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 HH
M24
d1 hole diameter 11.5 – 12.5
b length of thread 135
a opening Range 29
L1 length 225 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 HH
M30
d1 hole diameter 15.5 – 16.5
b length of thread 140
a opening Range 31
L1 length 255 Thread · ISO 261/262
Pitch P 3.5
d2 27.727
d3 25.706
Tap drill 26.5
Stress area As 560.59 mm² Size sheet · DIN 1478 HH
M36
d1 hole diameter 15.5 – 16.5
b length of thread 170
a opening Range 35
L1 length 300 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 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.