Dimensions mm · values as the standard states them Size P d e h b c a r t mass z 13 13
13 – 13.43
3.7
4.9
3.9 – 5.9
30
29.35 – 30.65
1.6
1.6 – 1.9
26
24 – 28
≈ 2
≈ 0.7
18.3
1.68
17 17
17 – 17.23
4.45
5.9
4.9 – 6.9
36
35.2 – 36.8
1.6
1.6 – 1.9
32
29.5 – 34.5
≈ 2.4
≈ 0.8
31.7
2
21 21
21 – 21.52
5.25
7
5.8 – 8.2
44
43.2 – 44.8
2
2 – 2.5
40
37.5 – 42.5
≈ 2.8
≈ 0.9
27.1
2
23 23
23 – 23.52
6
8
6.8 – 9.2
50
49.2 – 50.8
2
2 – 2.5
44
41.5 – 56.5
≈ 3.2
≈ 1
82.8
2
25 25
25 – 25.52
6.26
8.5
7.3 – 9.7
56
55.05 – 56.95
2
2 – 2.5
56
53 – 59
≈ 3.2
≈ 1
129
3.8
28 28
28 – 28.52
6.26
8.5
7.3 – 9.7
56
55.05 – 56.95
2.5
2.5 – 3
56
53 – 59
≈ 3.2
≈ 1
122
3.8
31 31
31 – 32
6.52
9
7.8 – 10.2
62
61.05 – 62.95
2.5
2.5 – 3
62
59 – 65
≈ 3.2
≈ 1
156
3.8
37 37
37 – 38
6.68
9.4
8.2 – 10.6
68
3
3 – 3.5
68
65 – 71
≈ 3.2
≈ 1
182
3.8
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 6918
13
d Inner diameter 13
e height axis washers 3.7
h thickness 4.9
b side length 30
c height shrinkage 1.6
a side length 26
r ≈ 2
t groove depth ≈ 0.7
mass mass per 1000 pieces (kg) 18.3
z 1.68 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 6918
17
d Inner diameter 17
e height axis washers 4.45
h thickness 5.9
b side length 36
c height shrinkage 1.6
a side length 32
r ≈ 2.4
t groove depth ≈ 0.8
mass mass per 1000 pieces (kg) 31.7
z 2 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 6918
21
d Inner diameter 21
e height axis washers 5.25
h thickness 7
b side length 44
c height shrinkage 2
a side length 40
r ≈ 2.8
t groove depth ≈ 0.9
mass mass per 1000 pieces (kg) 27.1
z 2 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 6918
23
d Inner diameter 23
e height axis washers 6
h thickness 8
b side length 50
c height shrinkage 2
a side length 44
r ≈ 3.2
t groove depth ≈ 1
mass mass per 1000 pieces (kg) 82.8
z 2 Thread · ISO 261/262
Pitch P 2.5
d2 20.376
d3 18.933
Tap drill 19.5
Stress area As 303.4 mm² Size sheet · DIN 6918
25
d Inner diameter 25
e height axis washers 6.26
h thickness 8.5
b side length 56
c height shrinkage 2
a side length 56
r ≈ 3.2
t groove depth ≈ 1
mass mass per 1000 pieces (kg) 129
z 3.8 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 6918
28
d Inner diameter 28
e height axis washers 6.26
h thickness 8.5
b side length 56
c height shrinkage 2.5
a side length 56
r ≈ 3.2
t groove depth ≈ 1
mass mass per 1000 pieces (kg) 122
z 3.8 Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Size sheet · DIN 6918
31
d Inner diameter 31
e height axis washers 6.52
h thickness 9
b side length 62
c height shrinkage 2.5
a side length 62
r ≈ 3.2
t groove depth ≈ 1
mass mass per 1000 pieces (kg) 156
z 3.8 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 6918
37
d Inner diameter 37
e height axis washers 6.68
h thickness 9.4
b side length 68
c height shrinkage 3
a side length 68
r ≈ 3.2
t groove depth ≈ 1
mass mass per 1000 pieces (kg) 182
z 3.8 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.
Data notes (1) 1 value(s) omitted after consistency checks: 37 b: min 97.05 > max 68.95 in source — min/max omitted