Dimensions mm · values as the standard states them Size P s e k dw da c r case_depth core_hole dh fit H11 M4 0.7 7
6.78 – 7
≥ 7.66
2.8
≥ 5.9
≤ 4.7
0.15 – 0.4
≤ 0.2
0.1 – 0.25
M4
3.6
M5 0.8 8
7.78 – 8
≥ 8.79
3.5
3.35 – 3.65
≥ 6.9
≤ 5.7
0.15 – 0.5
≤ 0.2
0.1 – 0.25
M5
4.5
M6 1 10
9.78 – 10
≥ 11.05
4
3.85 – 4.15
≥ 8.9
≤ 6.8
0.15 – 0.5
≤ 0.25
0.15 – 0.28
M6
5.5
M8 1.25 13
12.73 – 13
≥ 11.4
5.3
5.15 – 5.45
≥ 11.6
≤ 9.2
0.15 – 0.6
≤ 0.4
0.15 – 0.28
M8
7.4
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 7513 A
M4
s width across flats 7
e width across corners ≥ 7.66
k head height 2.8
dw bearing face diameter ≥ 5.9
da transition diameter ≤ 4.7
c 0.15 – 0.4
r fillet radius ≤ 0.2
case_depth 0.1 – 0.25
core_hole M4
dh (fit H11) 3.6 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
8 · 10 · 12 · 14 · 16 · 18 · 20 · 22 · 25
Size sheet · DIN 7513 A
M5
s width across flats 8
e width across corners ≥ 8.79
k head height 3.5
dw bearing face diameter ≥ 6.9
da transition diameter ≤ 5.7
c 0.15 – 0.5
r fillet radius ≤ 0.2
case_depth 0.1 – 0.25
core_hole M5
dh (fit H11) 4.5 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
10 · 12 · 14 · 16 · 18 · 20 · 22 · 25 · 30
Size sheet · DIN 7513 A
M6
s width across flats 10
e width across corners ≥ 11.05
k head height 4
dw bearing face diameter ≥ 8.9
da transition diameter ≤ 6.8
c 0.15 – 0.5
r fillet radius ≤ 0.25
case_depth 0.15 – 0.28
core_hole M6
dh (fit H11) 5.5 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
12 · 14 · 16 · 18 · 20 · 22 · 25 · 30 · 35
Size sheet · DIN 7513 A
M8
s width across flats 13
e width across corners ≥ 11.4
k head height 5.3
dw bearing face diameter ≥ 11.6
da transition diameter ≤ 9.2
c 0.15 – 0.6
r fillet radius ≤ 0.4
case_depth 0.15 – 0.28
core_hole M8
dh (fit H11) 7.4 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
14 · 16 · 18 · 20 · 22 · 25 · 30 · 35 · 40
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: M4 k: min 2.8 > max 2.68 in source — min/max omitted