Dimensions mm · values as the standard states them Size P b c a g M8 1.25 20
45
± 5
24
± 3
≈ 30
M10 1.5 25
55
± 5
30
± 3
≈ 38
M12 1.75 30
65
± 5
36
± 3
≈ 45
M16 2 40
85
± 5
48
± 3
≈ 60
M20 2.5 50
105
± 5
60
± 3
≈ 75
M24 3 60
125
± 5
75
± 3
≈ 90
M30 3.5 75
155
± 5
95
± 3
≈ 115
M36 4 90
190
± 5
115
± 3
≈ 135
M42 4.5 105
220
± 5
135
± 3
≈ 155
M48 5 120
250
± 5
155
± 3
≈ 180
M56 5.5 140
290
± 5
180
± 3
≈ 210
M64 6 160
335
± 5
200
± 3
≈ 235
M72x6 6 180
370
± 5
240
± 3
≈ 260
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 529 A
M8
b length of the thread (at least) 20
c head height 45
a head width 24
g ≈ 30 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Standard lengths
80 · 100 · 125 · 160 · 200
Size sheet · DIN 529 A
M10
b length of the thread (at least) 25
c head height 55
a head width 30
g ≈ 38 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Standard lengths
100 · 125 · 160 · 200 · 250
Size sheet · DIN 529 A
M12
b length of the thread (at least) 30
c head height 65
a head width 36
g ≈ 45 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Standard lengths
125 · 160 · 200 · 250 · 320
Size sheet · DIN 529 A
M16
b length of the thread (at least) 40
c head height 85
a head width 48
g ≈ 60 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Standard lengths
160 · 200 · 250 · 320 · 400 · 500
Size sheet · DIN 529 A
M20
b length of the thread (at least) 50
c head height 105
a head width 60
g ≈ 75 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² Standard lengths
200 · 250 · 320 · 400 · 500 · 630 · 800
Size sheet · DIN 529 A
M24
b length of the thread (at least) 60
c head height 125
a head width 75
g ≈ 90 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Standard lengths
320 · 400 · 500 · 630 · 800 · 1000 · 1250
Size sheet · DIN 529 A
M30
b length of the thread (at least) 75
c head height 155
a head width 95
g ≈ 115 Thread · ISO 261/262
Pitch P 3.5
d2 27.727
d3 25.706
Tap drill 26.5
Stress area As 560.59 mm² Standard lengths
400 · 500 · 630 · 800 · 1000 · 1250 · 1600 · 2000
Size sheet · DIN 529 A
M36
b length of the thread (at least) 90
c head height 190
a head width 115
g ≈ 135 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 mm² Standard lengths
500 · 630 · 800 · 1000 · 1250 · 1600 · 2000 · 2500
Size sheet · DIN 529 A
M42
b length of the thread (at least) 105
c head height 220
a head width 135
g ≈ 155 Thread · ISO 261/262
Pitch P 4.5
d2 39.077
d3 36.479
Tap drill 37.5
Stress area As 1120.91 mm² Standard lengths
630 · 800 · 1000 · 1250 · 1600 · 2000 · 2500
Size sheet · DIN 529 A
M48
b length of the thread (at least) 120
c head height 250
a head width 155
g ≈ 180 Thread · ISO 261/262
Pitch P 5
d2 44.752
d3 41.866
Tap drill 43
Stress area As 1473.15 mm² Standard lengths
800 · 1000 · 1250 · 1600 · 2000 · 2500 · 3200
Size sheet · DIN 529 A
M56
b length of the thread (at least) 140
c head height 290
a head width 180
g ≈ 210 Thread · ISO 261/262
Pitch P 5.5
d2 52.428
d3 49.252
Tap drill 50.5
Stress area As 2030.02 mm² Standard lengths
1000 · 1250 · 1600 · 2000 · 2500 · 3200
Size sheet · DIN 529 A
M64
b length of the thread (at least) 160
c head height 335
a head width 200
g ≈ 235 Thread · ISO 261/262
Pitch P 6
d2 60.103
d3 56.639
Tap drill 58
Stress area As 2675.97 mm² Standard lengths
1250 · 1600 · 2000 · 2500 · 3200
Size sheet · DIN 529 A
M72x6
b length of the thread (at least) 180
c head height 370
a head width 240
g ≈ 260 Standard lengths
1600 · 2000 · 2500 · 3200
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.