Dimensions mm · values as the standard states them Type C Type F
Size P dk k a r t n f rf y y ST2.2 4.3
4 – 4.3
≈ 1.3
≤ 0.8
≤ 0.8
0.95 – 1.15
0.6
0.66 – 0.8
≈ 0.7
≈ 3.8
≤ 2
≤ 1.6
ST2.9 5.5
5.2 – 5.5
≈ 1.7
≤ 1.1
≤ 1.1
1.25 – 1.5
0.8
0.86 – 1
≈ 0.9
≈ 4.6
≤ 2.6
≤ 2.1
ST3.5 6.8
6.44 – 6.8
≈ 2.1
≤ 1.3
≤ 1.4
1.55 – 1.9
1
1.06 – 1.2
≈ 1.2
≈ 5.4
≤ 3.2
≤ 2.5
(ST3.9) 7.5
7.14 – 7.5
≈ 2.3
≤ 1.3
≤ 1.5
1.7 – 2.05
1
1.06 – 1.2
≈ 1.3
≈ 6
≤ 3.5
≤ 2.7
ST4.2 8.1
7.74 – 8.1
≈ 2.5
≤ 1.4
≤ 1.6
1.85 – 2.25
1.2
1.26 – 1.51
≈ 1.4
≈ 6.6
≤ 3.7
≤ 2.8
ST4.8 9.5
9.14 – 9.5
≈ 3
≤ 1.6
≤ 1.9
2.15 – 2.6
12
1.26 – 1.51
≈ 1.5
≈ 8.2
≤ 4.3
≤ 3.2
ST5.5 10.8
10.37 – 10.8
≈ 3.4
≤ 1.8
≤ 2.1
2.42 – 2.95
1.6
1.66 – 1.91
≈ 1.7
≈ 9.4
≤ 5
≤ 3.6
ST6.3 12.4
11.97 – 12.4
≈ 3.8
≤ 1.8
≤ 2.4
2.85 – 3.45
1.6
1.66 – 1.91
≈ 2
≈ 11.1
≤ 6
≤ 3.6
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 6.5 5.7 – 7.3
9.5 8.7 – 10.3
13 12.2 – 13.8
16 15.2 – 16.8
19 18.2 – 19.8
22 21.2 – 22.8
25 24.2 – 25.8
32 30.7 – 33.3
38 36.7 – 39.3
Size sheet · DIN 7973
ST2.2
dk head diameter 4.3
k head height ≈ 1.3
a ≤ 0.8
r fillet radius ≤ 0.8
t groove depth 0.95 – 1.15
n groove width 0.6
f height of the lens ≈ 0.7
rf ≈ 3.8
y ≤ 2
y ≤ 1.6 Standard lengths
6.5 · 9.5 · 13 · 16
Size sheet · DIN 7973
ST2.9
dk head diameter 5.5
k head height ≈ 1.7
a ≤ 1.1
r fillet radius ≤ 1.1
t groove depth 1.25 – 1.5
n groove width 0.8
f height of the lens ≈ 0.9
rf ≈ 4.6
y ≤ 2.6
y ≤ 2.1 Standard lengths
6.5 · 9.5 · 13 · 16 · 19
Size sheet · DIN 7973
ST3.5
dk head diameter 6.8
k head height ≈ 2.1
a ≤ 1.3
r fillet radius ≤ 1.4
t groove depth 1.55 – 1.9
n groove width 1
f height of the lens ≈ 1.2
rf ≈ 5.4
y ≤ 3.2
y ≤ 2.5 Standard lengths
9.5 · 13 · 16 · 19 · 22 · 25
Size sheet · DIN 7973
ST3.9
dk head diameter 7.5
k head height ≈ 2.3
a ≤ 1.3
r fillet radius ≤ 1.5
t groove depth 1.7 – 2.05
n groove width 1
f height of the lens ≈ 1.3
rf ≈ 6
y ≤ 3.5
y ≤ 2.7 Standard lengths
9.5 · 13 · 16 · 19 · 22 · 25
Size sheet · DIN 7973
ST4.2
dk head diameter 8.1
k head height ≈ 2.5
a ≤ 1.4
r fillet radius ≤ 1.6
t groove depth 1.85 – 2.25
n groove width 1.2
f height of the lens ≈ 1.4
rf ≈ 6.6
y ≤ 3.7
y ≤ 2.8 Standard lengths
9.5 · 13 · 16 · 19 · 22 · 25 · 32
Size sheet · DIN 7973
ST4.8
dk head diameter 9.5
k head height ≈ 3
a ≤ 1.6
r fillet radius ≤ 1.9
t groove depth 2.15 – 2.6
n groove width 12
f height of the lens ≈ 1.5
rf ≈ 8.2
y ≤ 4.3
y ≤ 3.2 Standard lengths
9.5 · 13 · 16 · 19 · 22 · 25 · 32 · 38
Size sheet · DIN 7973
ST5.5
dk head diameter 10.8
k head height ≈ 3.4
a ≤ 1.8
r fillet radius ≤ 2.1
t groove depth 2.42 – 2.95
n groove width 1.6
f height of the lens ≈ 1.7
rf ≈ 9.4
y ≤ 5
y ≤ 3.6 Standard lengths
13 · 16 · 19 · 22 · 25 · 32 · 38
Size sheet · DIN 7973
ST6.3
dk head diameter 12.4
k head height ≈ 3.8
a ≤ 1.8
r fillet radius ≤ 2.4
t groove depth 2.85 – 3.45
n groove width 1.6
f height of the lens ≈ 2
rf ≈ 11.1
y ≤ 6
y ≤ 3.6 Standard lengths
13 · 16 · 19 · 22 · 25 · 32 · 38
Provenance
Draft — values taken from a single source and not yet cross-checked.
Accessed 2026-09-23 · For design and safety-critical use, consult the current edition of the standard.
Data notes (1) The source publishes one identical table for DIN 7973, ISO 1483. It does not match the official ISO 1483 preview, so it is kept as the DIN table.