Dimensions mm · values as the standard states them Size P ds fit k6 s e k b 50 < l ≤ 150 b l > 150 b l ≤ 50 r dg k´ thread_alt M8 1.25 9
12.73 – 13
≥ 14.38
5.3
5.15 – 5.45
13.5
18.5
11.5
0.4 – 0.55
7.9 – 8.2
≥ 3.6
—
M10 1.5 11
16.73 – 17
≥ 18.9
5.4
5.22 – 6.58
15.5
20.5
13.5
0.4 – 0.55
9.9 – 10.2
≥ 4.3
—
M12 1.75 13
18.48 – 19
≥ 20.88
7.5
7.21 – 7.79
17.5
22.5
15.5
0.6 – 0.75
11.5 – 11.8
≥ 5.1
—
(M14) 2 15
21.16 – 22
≥ 23.91
8.8
8.51 – 9.09
19
24
17
0.6 – 0.75
13.5 – 13.8
≥ 8
—
M16 2 17
23.16 – 24
≥ 26.17
10
9.71 – 10.29
21
26
19
0.6 – 0.75
15.5 – 15.8
≥ 6.8
—
(M18) 2.5 19
26.16 – 27
≥ 29.56
11.5
11.15 – 11.85
23.5
28.5
21.5
—
17.5 – 17.8
≥ 7.8
(M18x2)
M20 2.5 21
29.16 – 30
≥ 32.95
12.5
12.15 – 12.85
24.5
29.5
22.5
0.9 – 0.95
19.1 – 19.4
≥ 8.5
M20x2
(M22) 2.5 23
33 – 34
≥ 37.29
14
13.65 – 14.35
26.5
31.5
24.5
0.8 – 0.95
21.1 – 21.4
≥ 9.6
(M22x2)
M24 3 25
35 – 36
≥ 39.55
15
14.65 – 15.35
28.5
33.5
26.5
0.8 – 0.95
23.1 – 23.4
≥ 10.5
M24x1,5
(M27) 3 28
40 – 41
≥ 45.2
17
16.65 – 17.35
31.5
36.5
—
1 – 1.15
—
≥ 11.7
(M27x2)
M30 3.5 32
45 – 46
≥ 50.85
19
18.58 – 19.42
34
39
—
1 – 1.15
29.7 – 30
≥ 13
M30x2
(M33) 3.5 34
49 – 50
≥ 55.37
21
20.58 – 21.42
36
41
—
1 – 1.15
31.7 – 32
≥ 14.4
(M33x2)
M36 4 38
53.8 – 55
≥ 60.79
22
21.58 – 22.42
40
45
—
1 – 1.15
35.7 – 36
≥ 15.1
M36x3
(M39) 4 40
58.8 – 60
≥ 66.44
25
24.58 – 25.42
42
47
—
1 – 1.15
37.7 – 38
≥ 17.2
(M39x3)
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 25 24.6 – 25.4
28 27.6 – 28.4
30 29.6 – 30.4
32 31.5 – 32.5
35 34.5 – 35.5
38 37.5 – 38.5
40 39.5 – 40.5
42 41.5 – 42.5
45 44.5 – 45.5
48 47.5 – 48.5
50 49.5 – 50.5
55 54.4 – 55.6
60 59.4 – 60.6
65 64.4 – 65.6
70 69.4 – 70.6
75 74.4 – 75.6
80 79.4 – 80.6
85 84.3 – 85.7
90 89.3 – 90.7
95 94.3 – 95.7
100 99.3 – 100.7
105 103.25 – 106.75
110 108.25 – 111.75
115 113.25 – 116.75
120 118.25 – 121.75
125 123 – 127
130 128 – 132
135 133 – 137
140 138 – 142
145 143 – 147
150 148 – 152
160 158 – 162
170 168 – 172
180 178 – 182
190 187.7 – 192.3
200 197.7 – 202.3
Size sheet · DIN 610
M8
ds shank diameter (fit k6) 9
s width across flats 12.73 – 13
e width across corners ≥ 14.38
k head height 5.3
b thread length (50 < l ≤ 150) 13.5
b thread length (l > 150) 18.5
b thread length (l ≤ 50) 11.5
r fillet radius 0.4 – 0.55
dg 7.9 – 8.2
k´ ≥ 3.6 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
25 · 28 · 30 · 32 · 35 · 38 · 40 · 42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80
Size sheet · DIN 610
M10
ds shank diameter (fit k6) 11
s width across flats 16.73 – 17
e width across corners ≥ 18.9
k head height 5.4
b thread length (50 < l ≤ 150) 15.5
b thread length (l > 150) 20.5
b thread length (l ≤ 50) 13.5
r fillet radius 0.4 – 0.55
dg 9.9 – 10.2
k´ ≥ 4.3 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
28 · 30 · 32 · 35 · 38 · 40 · 42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100
Size sheet · DIN 610
M12
ds shank diameter (fit k6) 13
s width across flats 18.48 – 19
e width across corners ≥ 20.88
k head height 7.5
b thread length (50 < l ≤ 150) 17.5
b thread length (l > 150) 22.5
b thread length (l ≤ 50) 15.5
r fillet radius 0.6 – 0.75
dg 11.5 – 11.8
k´ ≥ 5.1 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
30 · 32 · 35 · 38 · 40 · 42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120
Size sheet · DIN 610
M14
ds shank diameter (fit k6) 15
s width across flats 21.16 – 22
e width across corners ≥ 23.91
k head height 8.8
b thread length (50 < l ≤ 150) 19
b thread length (l > 150) 24
b thread length (l ≤ 50) 17
r fillet radius 0.6 – 0.75
dg 13.5 – 13.8
k´ ≥ 8 Thread · ISO 261/262
Pitch P 2
d2 12.701
d3 11.546
Tap drill 12
Stress area As 115.44 mm² Standard lengths
32 · 35 · 38 · 40 · 42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120
Size sheet · DIN 610
M16
ds shank diameter (fit k6) 17
s width across flats 23.16 – 24
e width across corners ≥ 26.17
k head height 10
b thread length (50 < l ≤ 150) 21
b thread length (l > 150) 26
b thread length (l ≤ 50) 19
r fillet radius 0.6 – 0.75
dg 15.5 – 15.8
k´ ≥ 6.8 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Standard lengths
35 · 38 · 40 · 42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150
Size sheet · DIN 610
M18
ds shank diameter (fit k6) 19
s width across flats 26.16 – 27
e width across corners ≥ 29.56
k head height 11.5
b thread length (50 < l ≤ 150) 23.5
b thread length (l > 150) 28.5
b thread length (l ≤ 50) 21.5
dg 17.5 – 17.8
k´ ≥ 7.8
thread_alt alternative / fine thread (M18x2) 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
38 · 40 · 42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150
Size sheet · DIN 610
M20
ds shank diameter (fit k6) 21
s width across flats 29.16 – 30
e width across corners ≥ 32.95
k head height 12.5
b thread length (50 < l ≤ 150) 24.5
b thread length (l > 150) 29.5
b thread length (l ≤ 50) 22.5
r fillet radius 0.9 – 0.95
dg 19.1 – 19.4
k´ ≥ 8.5
thread_alt alternative / fine thread M20x2 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
40 · 42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150
Size sheet · DIN 610
M22
ds shank diameter (fit k6) 23
s width across flats 33 – 34
e width across corners ≥ 37.29
k head height 14
b thread length (50 < l ≤ 150) 26.5
b thread length (l > 150) 31.5
b thread length (l ≤ 50) 24.5
r fillet radius 0.8 – 0.95
dg 21.1 – 21.4
k´ ≥ 9.6
thread_alt alternative / fine thread (M22x2) 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
42 · 45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150
Size sheet · DIN 610
M24
ds shank diameter (fit k6) 25
s width across flats 35 – 36
e width across corners ≥ 39.55
k head height 15
b thread length (50 < l ≤ 150) 28.5
b thread length (l > 150) 33.5
b thread length (l ≤ 50) 26.5
r fillet radius 0.8 – 0.95
dg 23.1 – 23.4
k´ ≥ 10.5
thread_alt alternative / fine thread M24x1,5 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Standard lengths
45 · 48 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150
Size sheet · DIN 610
M27
ds shank diameter (fit k6) 28
s width across flats 40 – 41
e width across corners ≥ 45.2
k head height 17
b thread length (50 < l ≤ 150) 31.5
b thread length (l > 150) 36.5
r fillet radius 1 – 1.15
k´ ≥ 11.7
thread_alt alternative / fine thread (M27x2) Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Standard lengths
55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 610
M30
ds shank diameter (fit k6) 32
s width across flats 45 – 46
e width across corners ≥ 50.85
k head height 19
b thread length (50 < l ≤ 150) 34
b thread length (l > 150) 39
r fillet radius 1 – 1.15
dg 29.7 – 30
k´ ≥ 13
thread_alt alternative / fine thread M30x2 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
55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 610
M33
ds shank diameter (fit k6) 34
s width across flats 49 – 50
e width across corners ≥ 55.37
k head height 21
b thread length (50 < l ≤ 150) 36
b thread length (l > 150) 41
r fillet radius 1 – 1.15
dg 31.7 – 32
k´ ≥ 14.4
thread_alt alternative / fine thread (M33x2) 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
60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 610
M36
ds shank diameter (fit k6) 38
s width across flats 53.8 – 55
e width across corners ≥ 60.79
k head height 22
b thread length (50 < l ≤ 150) 40
b thread length (l > 150) 45
r fillet radius 1 – 1.15
dg 35.7 – 36
k´ ≥ 15.1
thread_alt alternative / fine thread M36x3 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 mm² Standard lengths
65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 160 · 170 · 180 · 190 · 200
Size sheet · DIN 610
M39
ds shank diameter (fit k6) 40
s width across flats 58.8 – 60
e width across corners ≥ 66.44
k head height 25
b thread length (50 < l ≤ 150) 42
b thread length (l > 150) 47
r fillet radius 1 – 1.15
dg 37.7 – 38
k´ ≥ 17.2
thread_alt alternative / fine thread (M39x3) Thread · ISO 261/262
Pitch P 4
d2 36.402
d3 34.093
Tap drill 35
Stress area As 975.75 mm² Standard lengths
65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 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: M18 r: min 0.8 > max 0.75 in source — min/max omitted; M27 dg: min 25.7 > max 25 in source — min/max omitted