Dimensions mm · values as the standard states them Size P ds dk s e k b 125 < l ≤ 200 b l > 200 b l ≤ 125 dw da r dh lf t1 t2 v M4 0.7 3.82 – 4
6.78 – 7
3
3.02 – 3.1
≥ 3.44
2.66 – 2.8
—
—
14
≥ 6.2
≤ 4.7
≥ 0.2
2 – 2.06
≤ 0.6
1.6
1.48 – 1.72
3.3 – 3.6
≤ 0.4
M5 0.8 4.82 – 5
8.28 – 8.5
4
4.02 – 4.12
≥ 4.58
3.32 – 3.5
—
—
16
≥ 7.7
≤ 5.7
≥ 0.2
2.5 – 2.56
≤ 0.6
2
1.88 – 2.12
4 – 4.3
≤ 0.5
M6 1 5.82 – 6
9.78 – 10
5
5.02 – 5.14
≥ 5.72
3.82 – 4
—
—
18
≥ 9.2
≤ 6.8
≥ 0.25
3 – 3.06
≤ 0.68
2.5
2.38 – 2.62
5 – 5.3
≤ 0.6
M8 1.25 7.78 – 8
12.73 – 13
6
6.02 – 6.14
≥ 6.86
4.82 – 5
—
—
22
≥ 12.03
≤ 9.2
≥ 0.4
4 – 4.075
≤ 1.02
3
2.88 – 3.12
6.5 – 6.86
≤ 0.8
M10 1.5 9.78 – 10
15.73 – 16
8
8.025 – 8.175
≥ 9.15
6.28 – 6.5
32
—
26
≥ 15.03
≤ 11.2
≥ 0.4
5 – 5.075
≤ 1.02
3.5
3.35 – 3.65
7.5 – 7.86
≤ 1
M12 1.75 11.73 – 12
17.73 – 18
10
10.025 – 10.175
≥ 11.43
7.28 – 7.5
36
—
30
≥ 17.03
≤ 13.7
≥ 0.6
6 – 6.075
≤ 1.45
4
3.85 – 4.15
9 – 9.36
≤ 1.2
(M14) 2 13.73 – 14
20.67 – 21
12
12.032 – 12.212
≥ 13.72
8.28 – 8.5
40
—
34
≥ 19.83
≤ 15.7
≥ 0.6
7 – 7.09
≤ 1.45
4.5
4.35 – 4.65
10 – 10.36
≤ 1.4
M16 2 15.73 – 16
23.67 – 24
14
14.032 – 14.212
≥ 16
9.78 – 10
44
57
38
≥ 22.83
≤ 17.7
≥ 0.6
8 – 8.09
≤ 1.45
5.5
5.35 – 5.65
11.5 – 11.93
≤ 1.6
(M18) 2.5 17.73 – 18
26.67 – 27
14
14.032 – 14.212
≥ 16
10.73 – 11
48
61
42
≥ 25.83
≤ 20.2
≥ 0.6
8 – 8.09
≤ 1.87
6
5.85 – 6.15
12.5 – 12.93
≤ 1.8
M20 2.5 19.67 – 20
29.67 – 30
17
17.05 – 17.23
≥ 19.44
11.73 – 12
52
65
46
≥ 28.83
≤ 22.4
≥ 0.8
10 – 10.09
≤ 2.04
6.5
6.32 – 6.68
14 – 14.43
≤ 2
(M22) 2.5 21.67 – 22
32.61 – 33
17
17.05 – 17.23
≥ 19.44
12.73 – 13
56
69
50
≥ 31.61
≤ 24.4
≥ 0.8
10 – 10.09
≤ 2.04
7
6.82 – 7.18
15 – 15.43
≤ 2.2
M24 3 23.67 – 24
—
19
19.065 – 19.275
≥ 21.73
13.73 – 14
60
73
54
≥ 34.61
≤ 26.4
≥ 0.8
12 – 12.11
≤ 2.04
7
6.82 – 7.18
16 – 16.43
≤ 2.4
(M27) 3 26.67 – 27
39.61 – 40
19
19.065 – 19.275
≥ 21.73
15.73 – 16
66
79
60
≥ 38.61
≤ 30.4
≥ 1
12 – 12.11
≤ 2.89
8.5
8.32 – 8.68
17 – 17.43
≤ 2.7
M30 3.5 29.67 – 30
44.61 – 45
22
22.065 – 22.275
≥ 25.15
17.23 – 17.5
72
85
66
≥ 43.61
≤ 33.4
≥ 1
15 – 15.11
≤ 2.89
9
8.82 – 9.18
19 – 19.52
≤ 3
(M33) 3.5 32.61 – 33
49.61 – 50
24
24.065 – 24.275
≥ 27.43
19.17 – 19.5
78
91
72
≥ 48.61
≤ 36.4
≥ 1
16.5 – 16.61
≤ 2.89
10
9.82 – 10.18
20 – 20.52
≤ 3.3
M36 4 —
53.54 – 54
27
27.065 – 27.275
≥ 30.85
21.17 – 21.5
84
97
78
≥ 52.34
≤ 39.4
≥ 1
18 – 18.11
≤ 2.89
11.5
11.28 – 11.72
24 – 24.52
≤ 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 10 9.71 – 10.29
12 11.65 – 12.35
16 15.65 – 16.35
20 19.58 – 20.42
25 24.58 – 25.42
30 29.58 – 30.42
35 34.5 – 35.5
40 39.5 – 40.5
50 49.5 – 50.5
60 59.4 – 60.6
70 69.4 – 70.6
80 79.4 – 80.6
90 89.3 – 90.7
100 99.3 – 100.7
110 109.3 – 110.7
120 119.3 – 120.7
130 129.2 – 130.8
140 139.2 – 140.8
150 149.2 – 150.8
160 159.2 – 160.8
170 169.2 – 170.8
180 179.2 – 180.8
190 189.1 – 190.9
200 199.1 – 200.9
Size sheet · DIN 6912
M4
ds shank diameter 3.82 – 4
dk head diameter 6.78 – 7
s width across flats 3
e width across corners ≥ 3.44
k head height 2.66 – 2.8
b thread length (l ≤ 125) 14
dw bearing face diameter ≥ 6.2
da transition diameter ≤ 4.7
r fillet radius ≥ 0.2
dh 2 – 2.06
lf ≤ 0.6
t1 1.6
t2 3.3 – 3.6
v ≤ 0.4 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
10 · 12 · 16 · 20 · 25 · 30 · 35 · 40 · 50
Size sheet · DIN 6912
M5
ds shank diameter 4.82 – 5
dk head diameter 8.28 – 8.5
s width across flats 4
e width across corners ≥ 4.58
k head height 3.32 – 3.5
b thread length (l ≤ 125) 16
dw bearing face diameter ≥ 7.7
da transition diameter ≤ 5.7
r fillet radius ≥ 0.2
dh 2.5 – 2.56
lf ≤ 0.6
t1 2
t2 4 – 4.3
v ≤ 0.5 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 · 16 · 20 · 25 · 30 · 35 · 40 · 50 · 60
Size sheet · DIN 6912
M6
ds shank diameter 5.82 – 6
dk head diameter 9.78 – 10
s width across flats 5
e width across corners ≥ 5.72
k head height 3.82 – 4
b thread length (l ≤ 125) 18
dw bearing face diameter ≥ 9.2
da transition diameter ≤ 6.8
r fillet radius ≥ 0.25
dh 3 – 3.06
lf ≤ 0.68
t1 2.5
t2 5 – 5.3
v ≤ 0.6 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 · 16 · 20 · 25 · 30 · 35 · 40 · 50 · 60 · 70
Size sheet · DIN 6912
M8
ds shank diameter 7.78 – 8
dk head diameter 12.73 – 13
s width across flats 6
e width across corners ≥ 6.86
k head height 4.82 – 5
b thread length (l ≤ 125) 22
dw bearing face diameter ≥ 12.03
da transition diameter ≤ 9.2
r fillet radius ≥ 0.4
dh 4 – 4.075
lf ≤ 1.02
t1 3
t2 6.5 – 6.86
v ≤ 0.8 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
12 · 16 · 20 · 25 · 30 · 35 · 40 · 50 · 60 · 70 · 80
Size sheet · DIN 6912
M10
ds shank diameter 9.78 – 10
dk head diameter 15.73 – 16
s width across flats 8
e width across corners ≥ 9.15
k head height 6.28 – 6.5
b thread length (125 < l ≤ 200) 32
b thread length (l ≤ 125) 26
dw bearing face diameter ≥ 15.03
da transition diameter ≤ 11.2
r fillet radius ≥ 0.4
dh 5 – 5.075
lf ≤ 1.02
t1 3.5
t2 7.5 – 7.86
v ≤ 1 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
16 · 20 · 25 · 30 · 35 · 40 · 50 · 60 · 70 · 80 · 90
Size sheet · DIN 6912
M12
ds shank diameter 11.73 – 12
dk head diameter 17.73 – 18
s width across flats 10
e width across corners ≥ 11.43
k head height 7.28 – 7.5
b thread length (125 < l ≤ 200) 36
b thread length (l ≤ 125) 30
dw bearing face diameter ≥ 17.03
da transition diameter ≤ 13.7
r fillet radius ≥ 0.6
dh 6 – 6.075
lf ≤ 1.45
t1 4
t2 9 – 9.36
v ≤ 1.2 Thread · ISO 261/262
Pitch P 1.75
d2 10.863
d3 9.853
Tap drill 10.25
Stress area As 84.27 mm² Standard lengths
16 · 20 · 25 · 30 · 35 · 40 · 50 · 60 · 70 · 80 · 90 · 100
Size sheet · DIN 6912
M14
ds shank diameter 13.73 – 14
dk head diameter 20.67 – 21
s width across flats 12
e width across corners ≥ 13.72
k head height 8.28 – 8.5
b thread length (125 < l ≤ 200) 40
b thread length (l ≤ 125) 34
dw bearing face diameter ≥ 19.83
da transition diameter ≤ 15.7
r fillet radius ≥ 0.6
dh 7 – 7.09
lf ≤ 1.45
t1 4.5
t2 10 – 10.36
v ≤ 1.4 Thread · ISO 261/262
Pitch P 2
d2 12.701
d3 11.546
Tap drill 12
Stress area As 115.44 mm² Standard lengths
20 · 25 · 30 · 35 · 40 · 50 · 60 · 70 · 80 · 90 · 100 · 110 · 120
Size sheet · DIN 6912
M16
ds shank diameter 15.73 – 16
dk head diameter 23.67 – 24
s width across flats 14
e width across corners ≥ 16
k head height 9.78 – 10
b thread length (125 < l ≤ 200) 44
b thread length (l > 200) 57
b thread length (l ≤ 125) 38
dw bearing face diameter ≥ 22.83
da transition diameter ≤ 17.7
r fillet radius ≥ 0.6
dh 8 – 8.09
lf ≤ 1.45
t1 5.5
t2 11.5 – 11.93
v ≤ 1.6 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Standard lengths
20 · 25 · 30 · 35 · 40 · 50 · 60 · 70 · 80 · 90 · 100 · 110 · 120 · 130 · 140
Size sheet · DIN 6912
M18
ds shank diameter 17.73 – 18
dk head diameter 26.67 – 27
s width across flats 14
e width across corners ≥ 16
k head height 10.73 – 11
b thread length (125 < l ≤ 200) 48
b thread length (l > 200) 61
b thread length (l ≤ 125) 42
dw bearing face diameter ≥ 25.83
da transition diameter ≤ 20.2
r fillet radius ≥ 0.6
dh 8 – 8.09
lf ≤ 1.87
t1 6
t2 12.5 – 12.93
v ≤ 1.8 Thread · ISO 261/262
Pitch P 2.5
d2 16.376
d3 14.933
Tap drill 15.5
Stress area As 192.47 mm² Standard lengths
25 · 30 · 35 · 40 · 50 · 60 · 70 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150
Size sheet · DIN 6912
M20
ds shank diameter 19.67 – 20
dk head diameter 29.67 – 30
s width across flats 17
e width across corners ≥ 19.44
k head height 11.73 – 12
b thread length (125 < l ≤ 200) 52
b thread length (l > 200) 65
b thread length (l ≤ 125) 46
dw bearing face diameter ≥ 28.83
da transition diameter ≤ 22.4
r fillet radius ≥ 0.8
dh 10 – 10.09
lf ≤ 2.04
t1 6.5
t2 14 – 14.43
v ≤ 2 Thread · ISO 261/262
Pitch P 2.5
d2 18.376
d3 16.933
Tap drill 17.5
Stress area As 244.79 mm² Standard lengths
30 · 35 · 40 · 50 · 60 · 70 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180
Size sheet · DIN 6912
M22
ds shank diameter 21.67 – 22
dk head diameter 32.61 – 33
s width across flats 17
e width across corners ≥ 19.44
k head height 12.73 – 13
b thread length (125 < l ≤ 200) 56
b thread length (l > 200) 69
b thread length (l ≤ 125) 50
dw bearing face diameter ≥ 31.61
da transition diameter ≤ 24.4
r fillet radius ≥ 0.8
dh 10 – 10.09
lf ≤ 2.04
t1 7
t2 15 – 15.43
v ≤ 2.2 Thread · ISO 261/262
Pitch P 2.5
d2 20.376
d3 18.933
Tap drill 19.5
Stress area As 303.4 mm² Standard lengths
40 · 50 · 60 · 70 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 6912
M24
ds shank diameter 23.67 – 24
s width across flats 19
e width across corners ≥ 21.73
k head height 13.73 – 14
b thread length (125 < l ≤ 200) 60
b thread length (l > 200) 73
b thread length (l ≤ 125) 54
dw bearing face diameter ≥ 34.61
da transition diameter ≤ 26.4
r fillet radius ≥ 0.8
dh 12 – 12.11
lf ≤ 2.04
t1 7
t2 16 – 16.43
v ≤ 2.4 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Standard lengths
60 · 70 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 6912
M27
ds shank diameter 26.67 – 27
dk head diameter 39.61 – 40
s width across flats 19
e width across corners ≥ 21.73
k head height 15.73 – 16
b thread length (125 < l ≤ 200) 66
b thread length (l > 200) 79
b thread length (l ≤ 125) 60
dw bearing face diameter ≥ 38.61
da transition diameter ≤ 30.4
r fillet radius ≥ 1
dh 12 – 12.11
lf ≤ 2.89
t1 8.5
t2 17 – 17.43
v ≤ 2.7 Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Standard lengths
70 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 6912
M30
ds shank diameter 29.67 – 30
dk head diameter 44.61 – 45
s width across flats 22
e width across corners ≥ 25.15
k head height 17.23 – 17.5
b thread length (125 < l ≤ 200) 72
b thread length (l > 200) 85
b thread length (l ≤ 125) 66
dw bearing face diameter ≥ 43.61
da transition diameter ≤ 33.4
r fillet radius ≥ 1
dh 15 – 15.11
lf ≤ 2.89
t1 9
t2 19 – 19.52
v ≤ 3 Thread · ISO 261/262
Pitch P 3.5
d2 27.727
d3 25.706
Tap drill 26.5
Stress area As 560.59 mm² Standard lengths
70 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 6912
M33
ds shank diameter 32.61 – 33
dk head diameter 49.61 – 50
s width across flats 24
e width across corners ≥ 27.43
k head height 19.17 – 19.5
b thread length (125 < l ≤ 200) 78
b thread length (l > 200) 91
b thread length (l ≤ 125) 72
dw bearing face diameter ≥ 48.61
da transition diameter ≤ 36.4
r fillet radius ≥ 1
dh 16.5 – 16.61
lf ≤ 2.89
t1 10
t2 20 – 20.52
v ≤ 3.3 Thread · ISO 261/262
Pitch P 3.5
d2 30.727
d3 28.706
Tap drill 29.5
Stress area As 693.55 mm² Standard lengths
80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 6912
M36
dk head diameter 53.54 – 54
s width across flats 27
e width across corners ≥ 30.85
k head height 21.17 – 21.5
b thread length (125 < l ≤ 200) 84
b thread length (l > 200) 97
b thread length (l ≤ 125) 78
dw bearing face diameter ≥ 52.34
da transition diameter ≤ 39.4
r fillet radius ≥ 1
dh 18 – 18.11
lf ≤ 2.89
t1 11.5
t2 24 – 24.52
v ≤ 3.6 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 mm² Standard lengths
90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 170 · 180 · 190 · 200
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) 2 value(s) omitted after consistency checks: M24 dk: min 65.61 > max 36 in source — min/max omitted; M36 ds: min 65.61 > max 36 in source — min/max omitted