Dimensions mm · values as the standard states them Recess H Recess Z
Size P dk m m k b da a r t t recess_no rf v x M1.6 0.35 3.2
2.9 – 3.2
≈ 1.8
≈ 1.8
1.3
1.18 – 1.42
15
+2 0 P
≤ 2.1
≤ 0.7
≥ 0.1
0.72 – 1.02
0.92 – 1.17
0
≈ 3
≈ 0.8
≤ 0.9
M2 0.4 4
3.7 – 4
≈ 2.5
≈ 2.4
1.6
1.48 – 1.72
16
+2 0 P
≤ 2.6
≤ 0.8
≥ 0.1
1.1 – 1.4
1.1 – 1.35
1
≈ 4
≈ 1.1
≤ 1
M2.5 0.45 5
4.7 – 5
≈ 2.7
≈ 2.6
2
1.88 – 2.12
18
+2 0 P
≤ 3.1
≤ 0.9
≥ 0.1
1.3 – 1.6
1.27 – 1.52
1
≈ 5
≈ 1.3
≤ 1.1
M3 0.5 6
5.7 – 6
≈ 3.1
≈ 3
2.4
2.28 – 2.52
19
+2 0 P
≤ 3.6
≤ 1
≥ 0.1
1.7 – 2
1.68 – 1.93
1
≈ 6
≈ 1.6
≤ 1.25
(M3.5) 0.6 7
6.64 – 7
≈ 4.2
≈ 4
2.7
2.58 – 2.82
20
+2 0 P
≤ 4.1
≤ 1.2
≥ 0.2
1.74 – 2.24
1.65 – 2.11
2
≈ 7
≈ 1.9
≤ 1.5
M4 0.7 8
7.64 – 8
≈ 4.6
≈ 4.3
3.1
2.95 – 3.25
22
+2 0 P
≤ 4.7
≤ 1.4
≥ 0.2
2.04 – 2.54
1.9 – 2.36
2
≈ 8
≈ 2
≤ 1.75
M5 0.8 10
9.64 – 10
≈ 5.3
≈ 5
3.8
3.65 – 3.95
25
+2 0 P
≤ 5.7
≤ 1.6
≥ 0.2
2.77 – 3.27
2.64 – 3.1
2
≈ 10
≈ 2.5
≤ 2
M6 1 12
11.57 – 12
≈ 6.8
≈ 6.7
4.6
4.45 – 4.75
28
+2 0 P
≤ 6.8
≤ 2
≥ 0.25
3.03 – 3.53
3.02 – 3.48
3
≈ 12
≈ 3
≤ 2.5
M8 1.25 16
15.57 – 16
≈ 9
≈ 8.8
6
5.85 – 6.15
34
+2 0 P
≤ 9.2
≤ 2.5
≥ 0.4
4.18 – 4.68
4.06 – 4.52
4
≈ 16
≈ 3.7
≤ 3.2
M10 1.5 20
19.48 – 20
≈ 10.2
≈ 9.9
7.5
7.32 – 7.68
40
+2 0 P
≤ 11.2
≤ 3
≥ 0.4
5.38 – 5.88
5.23 – 5.69
4
≈ 20
≈ 4.8
≤ 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.
Length tolerances 2 1.8 – 2.2
3 2.8 – 3.2
4 3.75 – 4.25
5 4.75 – 5.25
6 5.75 – 6.25
8 7.7 – 8.3
10 9.7 – 10.3
12 11.65 – 12.35
14 13.65 – 14.35
16 15.65 – 16.35
18 17.65 – 18.35
20 19.6 – 20.4
22 21.6 – 22.4
25 24.6 – 25.4
28 27.6 – 28.4
30 29.6 – 30.4
35 34.5 – 35.5
40 39.5 – 40.5
45 44.5 – 45.5
50 49.5 – 50.5
55 54 – 56
60 59 – 61
Size sheet · DIN 7985
M1.6
dk head diameter 3.2
m groove width ≈ 1.8
m groove width ≈ 1.8
k head height 1.3
b thread length 15
da transition diameter ≤ 2.1
a length undercut ≤ 0.7
r fillet radius ≥ 0.1
t 0.72 – 1.02
t 0.92 – 1.17
recess_no drive size 0
rf ≈ 3
v ≈ 0.8
x thread run ≤ 0.9 Thread · ISO 261/262
Pitch P 0.35
d2 1.373
d3 1.171
Tap drill 1.25
Stress area As 1.27 mm² Size sheet · DIN 7985
M2
dk head diameter 4
m groove width ≈ 2.5
m groove width ≈ 2.4
k head height 1.6
b thread length 16
da transition diameter ≤ 2.6
a length undercut ≤ 0.8
r fillet radius ≥ 0.1
t 1.1 – 1.4
t 1.1 – 1.35
recess_no drive size 1
rf ≈ 4
v ≈ 1.1
x thread run ≤ 1 Thread · ISO 261/262
Pitch P 0.4
d2 1.74
d3 1.509
Tap drill 1.6
Stress area As 2.07 mm² Size sheet · DIN 7985
M2.5
dk head diameter 5
m groove width ≈ 2.7
m groove width ≈ 2.6
k head height 2
b thread length 18
da transition diameter ≤ 3.1
a length undercut ≤ 0.9
r fillet radius ≥ 0.1
t 1.3 – 1.6
t 1.27 – 1.52
recess_no drive size 1
rf ≈ 5
v ≈ 1.3
x thread run ≤ 1.1 Thread · ISO 261/262
Pitch P 0.45
d2 2.208
d3 1.948
Tap drill 2.05
Stress area As 3.39 mm² Standard lengths
3 · 4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30
Size sheet · DIN 7985
M3
dk head diameter 6
m groove width ≈ 3.1
m groove width ≈ 3
k head height 2.4
b thread length 19
da transition diameter ≤ 3.6
a length undercut ≤ 1
r fillet radius ≥ 0.1
t 1.7 – 2
t 1.68 – 1.93
recess_no drive size 1
rf ≈ 6
v ≈ 1.6
x thread run ≤ 1.25 Thread · ISO 261/262
Pitch P 0.5
d2 2.675
d3 2.387
Tap drill 2.5
Stress area As 5.03 mm² Standard lengths
4 · 5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30
Size sheet · DIN 7985
M3.5
dk head diameter 7
m groove width ≈ 4.2
m groove width ≈ 4
k head height 2.7
b thread length 20
da transition diameter ≤ 4.1
a length undercut ≤ 1.2
r fillet radius ≥ 0.2
t 1.74 – 2.24
t 1.65 – 2.11
recess_no drive size 2
rf ≈ 7
v ≈ 1.9
x thread run ≤ 1.5 Thread · ISO 261/262
Pitch P 0.6
d2 3.11
d3 2.764
Tap drill 2.9
Stress area As 6.78 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35
Size sheet · DIN 7985
M4
dk head diameter 8
m groove width ≈ 4.6
m groove width ≈ 4.3
k head height 3.1
b thread length 22
da transition diameter ≤ 4.7
a length undercut ≤ 1.4
r fillet radius ≥ 0.2
t 2.04 – 2.54
t 1.9 – 2.36
recess_no drive size 2
rf ≈ 8
v ≈ 2
x thread run ≤ 1.75 Thread · ISO 261/262
Pitch P 0.7
d2 3.545
d3 3.141
Tap drill 3.3
Stress area As 8.78 mm² Standard lengths
5 · 6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40
Size sheet · DIN 7985
M5
dk head diameter 10
m groove width ≈ 5.3
m groove width ≈ 5
k head height 3.8
b thread length 25
da transition diameter ≤ 5.7
a length undercut ≤ 1.6
r fillet radius ≥ 0.2
t 2.77 – 3.27
t 2.64 – 3.1
recess_no drive size 2
rf ≈ 10
v ≈ 2.5
x thread run ≤ 2 Thread · ISO 261/262
Pitch P 0.8
d2 4.48
d3 4.019
Tap drill 4.2
Stress area As 14.18 mm² Standard lengths
6 · 8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50
Size sheet · DIN 7985
M6
dk head diameter 12
m groove width ≈ 6.8
m groove width ≈ 6.7
k head height 4.6
b thread length 28
da transition diameter ≤ 6.8
a length undercut ≤ 2
r fillet radius ≥ 0.25
t 3.03 – 3.53
t 3.02 – 3.48
recess_no drive size 3
rf ≈ 12
v ≈ 3
x thread run ≤ 2.5 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50
Size sheet · DIN 7985
M8
dk head diameter 16
m groove width ≈ 9
m groove width ≈ 8.8
k head height 6
b thread length 34
da transition diameter ≤ 9.2
a length undercut ≤ 2.5
r fillet radius ≥ 0.4
t 4.18 – 4.68
t 4.06 – 4.52
recess_no drive size 4
rf ≈ 16
v ≈ 3.7
x thread run ≤ 3.2 Thread · ISO 261/262
Pitch P 1.25
d2 7.188
d3 6.466
Tap drill 6.75
Stress area As 36.61 mm² Standard lengths
10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55 · 60
Size sheet · DIN 7985
M10
dk head diameter 20
m groove width ≈ 10.2
m groove width ≈ 9.9
k head height 7.5
b thread length 40
da transition diameter ≤ 11.2
a length undercut ≤ 3
r fillet radius ≥ 0.4
t 5.38 – 5.88
t 5.23 – 5.69
recess_no drive size 4
rf ≈ 20
v ≈ 4.8
x thread run ≤ 3.8 Thread · ISO 261/262
Pitch P 1.5
d2 9.026
d3 8.16
Tap drill 8.5
Stress area As 57.99 mm² Standard lengths
12 · 14 · 16 · 18 · 20 · 22 · 25 · 28 · 30 · 35 · 40 · 45 · 50 · 55 · 60
Provenance
Draft — values taken from a single source and not yet cross-checked.
fasteners.eu dimensions, lengths, materials, property classes, current norm, equivalent norms Otto Roth status 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 7985, ISO 7045. Kept as the DIN table (it differs from the current ISO standard).