Dimensions mm · values as the standard states them Size P ds s e k da 4 3.52 – 4
7
6.64 – 7
≥ 7.5
2.8
2.5 – 3.1
≤ 5
5 4.52 – 5
8
7.64 – 8
≥ 8.63
3.5
3.13 – 3.88
≤ 6
6 5.52 – 6
10
9.64 – 10
≥ 10.89
4
3.63 – 4.38
≤ 7.2
(7) 6.42 – 7
12
11.57 – 12
≥ 13.07
5
4.63 – 5.38
≤ 8.2
8 7.42 – 8
13
12.57 – 13
≥ 14.2
5.5
5.13 – 5.88
≤ 10.2
10 9.42 – 10
17
16.57 – 17
≥ 18.72
7
6.55 – 7.45
≤ 12.2
12 11.3 – 12
19
18.48 – 19
≥ 20.88
8
7.55 – 8.45
≤ 15.2
16 15.3 – 16
24
23.16 – 24
≥ 26.17
10
9.55 – 10.45
≤ 19.2
20 19.3 – 20
30
29.16 – 30
≥ 32.95
13
12.1 – 13.9
≤ 24.4
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.
Length tolerances 16 15.1 – 16.9
20 18.95 – 21.05
25 23.95 – 26.05
30 28.95 – 31.05
35 33.75 – 36.25
40 38.75 – 41.25
45 43.75 – 46.25
50 48.75 – 51.25
55 53.5 – 56.5
60 58.5 – 61.5
65 63.5 – 66.5
70 68.5 – 71.5
75 73.5 – 76.5
80 78.5 – 81.5
90 88.25 – 91.75
100 98.25 – 101.75
110 108.25 – 111.75
120 118.25 – 121.75
130 128 – 132
140 138 – 142
150 148 – 152
160 158 – 162
170 168 – 172
180 178 – 182
190 187.7 – 192.3
200 197.7 – 202.3
Size sheet · DIN 571
4
ds shank diameter 3.52 – 4
s width across flats 7
e width across corners ≥ 7.5
k head height 2.8
da transition diameter ≤ 5 Standard lengths
16 · 20 · 25 · 30 · 35 · 40
Size sheet · DIN 571
5
ds shank diameter 4.52 – 5
s width across flats 8
e width across corners ≥ 8.63
k head height 3.5
da transition diameter ≤ 6 Standard lengths
16 · 20 · 25 · 30 · 35 · 40
Size sheet · DIN 571
6
ds shank diameter 5.52 – 6
s width across flats 10
e width across corners ≥ 10.89
k head height 4
da transition diameter ≤ 7.2 Standard lengths
20 · 25 · 30 · 35 · 40 · 45 · 50 · 55 · 60
Size sheet · DIN 571
7
ds shank diameter 6.42 – 7
s width across flats 12
e width across corners ≥ 13.07
k head height 5
da transition diameter ≤ 8.2 Size sheet · DIN 571
8
ds shank diameter 7.42 – 8
s width across flats 13
e width across corners ≥ 14.2
k head height 5.5
da transition diameter ≤ 10.2 Standard lengths
25 · 30 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100
Size sheet · DIN 571
10
ds shank diameter 9.42 – 10
s width across flats 17
e width across corners ≥ 18.72
k head height 7
da transition diameter ≤ 12.2 Standard lengths
30 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100
Size sheet · DIN 571
12
ds shank diameter 11.3 – 12
s width across flats 19
e width across corners ≥ 20.88
k head height 8
da transition diameter ≤ 15.2 Standard lengths
35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120
Size sheet · DIN 571
16
ds shank diameter 15.3 – 16
s width across flats 24
e width across corners ≥ 26.17
k head height 10
da transition diameter ≤ 19.2 Standard lengths
50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160
Size sheet · DIN 571
20
ds shank diameter 19.3 – 20
s width across flats 30
e width across corners ≥ 32.95
k head height 13
da transition diameter ≤ 24.4 Standard lengths
60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180 · 190 · 200
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.