Dimensions mm · values as the standard states them 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 188
1.25
m head width 18
k head height 5.5
b thread length 22
n head thickness 8 Standard lengths
30 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80
Size sheet · DIN 188
1.5
m head width 21
k head height 7
b thread length 26
n head thickness 10 Standard lengths
30 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100
Size sheet · DIN 188
1.75
m head width 26
k head height 8
b thread length 30
n head thickness 12 Standard lengths
40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120
Size sheet · DIN 188
2
m head width 30
k head height 10.5
b thread length 38
n head thickness 16 Standard lengths
50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120 · 140 · 150
Size sheet · DIN 188
2.5
m head width 36
k head height 13
b thread length 46
n head thickness 20 Standard lengths
60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120 · 140 · 150 · 180 · 200
Size sheet · DIN 188
3
m head width 43
k head height 15
b thread length 54
n head thickness 24 Standard lengths
70 · 75 · 80 · 90 · 100 · 110 · 120 · 140 · 150 · 180 · 200
Size sheet · DIN 188
3.5
m head width 54
k head height 19
b thread length 66
n head thickness 30 Standard lengths
90 · 100 · 110 · 120 · 140 · 150 · 180 · 200
Size sheet · DIN 188
4
m head width 66
k head height 23
b thread length 78
n head thickness 36 Standard lengths
120 · 140 · 150 · 180 · 200 · 240
Size sheet · DIN 188
4.5
m head width 80
k head height 26
b thread length 96
n head thickness 42 Standard lengths
140 · 150 · 180 · 200 · 240 · 260
Size sheet · DIN 188
5
m head width 88
k head height 30
b thread length 108
n head thickness 48 Standard lengths
150 · 180 · 200 · 240 · 260 · 280
Size sheet · DIN 188
5.5
m head width 102
k head height 35
b thread length 124
n head thickness 56 Standard lengths
180 · 200 · 240 · 260 · 280 · 300
Size sheet · DIN 188
6
m head width 140
k head height 50
b thread length 172
n head thickness 80 Standard lengths
200 · 240 · 260 · 280 · 300 · 340 · 360 · 400
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.