Dimensions mm · values as the standard states them Size P b c a 0.6 2
≤ 1
≤ 1.6
0.8 2.4
≤ 1.4
≤ 1.6
1 3
≤ 1.8
≤ 1.6
1.2 3
≤ 2
≤ 2.5
1.6 3.2
≤ 2.8
≤ 2.5
2 4
≤ 3.6
≤ 2.5
2.5 5
≤ 4.6
≤ 2.5
3.2 6.4
≤ 5.8
≤ 3.2
4 8
≤ 7.4
≤ 4
5 10
≤ 9.2
≤ 4
6.3 12.6
≤ 11.8
≤ 4
8 16
≤ 15
≤ 4
10 20
≤ 19
≤ 6.3
13 26
≤ 24.8
≤ 6.3
16 32
≤ 30.8
≤ 6.3
20 40
≤ 38.5
≤ 6.3
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 · ISO 1234
0.6
b height of eye 2
c width of the eye ≤ 1
a offset end ≤ 1.6 Size sheet · ISO 1234
0.8
b height of eye 2.4
c width of the eye ≤ 1.4
a offset end ≤ 1.6 Size sheet · ISO 1234
1
b height of eye 3
c width of the eye ≤ 1.8
a offset end ≤ 1.6 Size sheet · ISO 1234
1.2
b height of eye 3
c width of the eye ≤ 2
a offset end ≤ 2.5 Size sheet · ISO 1234
1.6
b height of eye 3.2
c width of the eye ≤ 2.8
a offset end ≤ 2.5 Size sheet · ISO 1234
2
b height of eye 4
c width of the eye ≤ 3.6
a offset end ≤ 2.5 Size sheet · ISO 1234
2.5
b height of eye 5
c width of the eye ≤ 4.6
a offset end ≤ 2.5 Size sheet · ISO 1234
3.2
b height of eye 6.4
c width of the eye ≤ 5.8
a offset end ≤ 3.2 Size sheet · ISO 1234
4
b height of eye 8
c width of the eye ≤ 7.4
a offset end ≤ 4 Size sheet · ISO 1234
5
b height of eye 10
c width of the eye ≤ 9.2
a offset end ≤ 4 Size sheet · ISO 1234
6.3
b height of eye 12.6
c width of the eye ≤ 11.8
a offset end ≤ 4 Size sheet · ISO 1234
8
b height of eye 16
c width of the eye ≤ 15
a offset end ≤ 4 Size sheet · ISO 1234
10
b height of eye 20
c width of the eye ≤ 19
a offset end ≤ 6.3 Size sheet · ISO 1234
13
b height of eye 26
c width of the eye ≤ 24.8
a offset end ≤ 6.3 Size sheet · ISO 1234
16
b height of eye 32
c width of the eye ≤ 30.8
a offset end ≤ 6.3 Size sheet · ISO 1234
20
b height of eye 40
c width of the eye ≤ 38.5
a offset end ≤ 6.3 Provenance
Reviewed — dimensions cross-checked against the official ISO preview; values match.
Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (2) Dimensions cross-checked against the official ISO 1234:1997 preview — values match. The source publishes one identical table for DIN 94, ISO 1234.