Dimensions mm · values as the standard states them Recess H Recess Z
Type C Type F
Size P dk m m k a r t t f recess_no rf y y ST2.2 4.3
4 – 4.3
≈ 2.8
≈ 2.4
≈ 1.3
≤ 0.8
≤ 0.8
1.17 – 1.57
1.1 – 1.35
≈ 0.7
1
≈ 3.8
≤ 2
≤ 1.6
ST2.9 5.5
5.2 – 5.5
≈ 3.4
≈ 3.1
≈ 1.7
≤ 1.1
≤ 1.1
1.81 – 2.21
1.83 – 2.08
≈ 0.9
1
≈ 4.6
≤ 2.6
≤ 2.1
ST3.5 6.8
6.44 – 6.8
≈ 4.6
≈ 4.3
≈ 2.1
≤ 1.3
≤ 1.4
1.89 – 2.39
1.88 – 2.34
≈ 1.2
2
≈ 5.4
≤ 3.2
≤ 2.5
(ST3.9) 7.5
7.14 – 7.5
≈ 4.7
≈ 4.4
≈ 2.3
≤ 1.3
≤ 1.5
2.04 – 2.54
2 – 2.46
≈ 1.3
2
≈ 6
≤ 3.5
≤ 2.7
ST4.2 8.1
7.74 – 8.1
≈ 4.9
≈ 4.6
≈ 2.5
≤ 1.4
≤ 1.6
2.24 – 2.74
2.26 – 2.72
≈ 1.4
2
≈ 6.6
≤ 3.7
≤ 2.8
ST4.8 9.5
9.14 – 9.5
≈ 5.4
≈ 5.1
≈ 3
≤ 1.6
≤ 1.9
2.7 – 3.2
2.69 – 3.15
≈ 1.5
2
≈ 8.2
≤ 4.3
≤ 3.2
ST5.5 10.8
10.37 – 10.8
≈ 7
≈ 6.6
≈ 3.4
≤ 1.8
≤ 2.1
3.02 – 3.53
2.92 – 3.38
≈ 1.7
3
≈ 9.4
≤ 5
≤ 3.6
ST6.3 12.4
11.97 – 12.4
≈ 7.4
≈ 7.1
≈ 3.8
≤ 1.8
≤ 2.4
3.46 – 3.96
3.4 – 3.86
≈ 2
3
≈ 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 7983 F
ST2.2
dk head diameter 4.3
m groove width ≈ 2.8
m groove width ≈ 2.4
k head height ≈ 1.3
a ≤ 0.8
r fillet radius ≤ 0.8
t 1.17 – 1.57
t 1.1 – 1.35
f height of the lens ≈ 0.7
recess_no drive size 1
rf ≈ 3.8
y length of the point ≤ 2
y length of the point ≤ 1.6 Size sheet · DIN 7983 F
ST2.9
dk head diameter 5.5
m groove width ≈ 3.4
m groove width ≈ 3.1
k head height ≈ 1.7
a ≤ 1.1
r fillet radius ≤ 1.1
t 1.81 – 2.21
t 1.83 – 2.08
f height of the lens ≈ 0.9
recess_no drive size 1
rf ≈ 4.6
y length of the point ≤ 2.6
y length of the point ≤ 2.1 Size sheet · DIN 7983 F
ST3.5
dk head diameter 6.8
m groove width ≈ 4.6
m groove width ≈ 4.3
k head height ≈ 2.1
a ≤ 1.3
r fillet radius ≤ 1.4
t 1.89 – 2.39
t 1.88 – 2.34
f height of the lens ≈ 1.2
recess_no drive size 2
rf ≈ 5.4
y length of the point ≤ 3.2
y length of the point ≤ 2.5 Size sheet · DIN 7983 F
ST3.9
dk head diameter 7.5
m groove width ≈ 4.7
m groove width ≈ 4.4
k head height ≈ 2.3
a ≤ 1.3
r fillet radius ≤ 1.5
t 2.04 – 2.54
t 2 – 2.46
f height of the lens ≈ 1.3
recess_no drive size 2
rf ≈ 6
y length of the point ≤ 3.5
y length of the point ≤ 2.7 Size sheet · DIN 7983 F
ST4.2
dk head diameter 8.1
m groove width ≈ 4.9
m groove width ≈ 4.6
k head height ≈ 2.5
a ≤ 1.4
r fillet radius ≤ 1.6
t 2.24 – 2.74
t 2.26 – 2.72
f height of the lens ≈ 1.4
recess_no drive size 2
rf ≈ 6.6
y length of the point ≤ 3.7
y length of the point ≤ 2.8 Size sheet · DIN 7983 F
ST4.8
dk head diameter 9.5
m groove width ≈ 5.4
m groove width ≈ 5.1
k head height ≈ 3
a ≤ 1.6
r fillet radius ≤ 1.9
t 2.7 – 3.2
t 2.69 – 3.15
f height of the lens ≈ 1.5
recess_no drive size 2
rf ≈ 8.2
y length of the point ≤ 4.3
y length of the point ≤ 3.2 Size sheet · DIN 7983 F
ST5.5
dk head diameter 10.8
m groove width ≈ 7
m groove width ≈ 6.6
k head height ≈ 3.4
a ≤ 1.8
r fillet radius ≤ 2.1
t 3.02 – 3.53
t 2.92 – 3.38
f height of the lens ≈ 1.7
recess_no drive size 3
rf ≈ 9.4
y length of the point ≤ 5
y length of the point ≤ 3.6 Size sheet · DIN 7983 F
ST6.3
dk head diameter 12.4
m groove width ≈ 7.4
m groove width ≈ 7.1
k head height ≈ 3.8
a ≤ 1.8
r fillet radius ≤ 2.4
t 3.46 – 3.96
t 3.4 – 3.86
f height of the lens ≈ 2
recess_no drive size 3
rf ≈ 11.1
y length of the point ≤ 6
y length of the point ≤ 3.6 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 7983, ISO 7051. It does not match the official ISO 7051 preview, so it is kept as the DIN table.