Dimensions mm · values as the standard states them Size P ds s e k b dw da c r k´ M12 1.75 12
11.3 – 12.7
19
18.48 – 19
≥ 20.88
8
7.55 – 8.45
17.75
≥ 17.2
≤ 14.7
≤ 0.6
≥ 0.6
≥ 5.28
M16 2 16
15.3 – 16.7
24
23.16 – 24
≥ 26.17
10
9.25 – 10.75
21
≥ 22
≤ 18.7
≤ 0.8
≥ 0.6
≥ 6.47
M20 2.5 20
19.16 – 20.84
30
29.16 – 30
≥ 32.95
13
12.1 – 13.9
23.5
≥ 27.7
≤ 24.4
≤ 0.8
≥ 0.8
≥ 8.47
M22 2.5 22
21.16 – 22.84
32
31 – 32
≥ 35.03
14
13.1 – 14.9
25.5
≥ 29.5
≤ 26.4
≤ 0.8
≥ 0.8
≥ 9.17
M24 3 24
23.16 – 24.84
36
35 – 36
≥ 39.55
15
14.1 – 18.9
26
≥ 33.2
≤ 28.4
≤ 0.8
≥ 0.8
≥ 9.87
M27 3 27
26.16 – 27.84
41
40 – 41
≥ 45.2
17
16.1 – 17.9
29
—
≤ 32.4
≤ 0.8
≥ 1
≥ 11.27
M30 3.5 30
46
45 – 46
≥ 50.85
19
17.95 – 20.05
30.5
≥ 42.7
≤ 35.4
≤ 0.8
≥ 1
≥ 12.56
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 30 28.95 – 31.05
35 33.75 – 36.25
40 38.75 – 41.25
45 43.75 – 46.25
50 48.75 – 51.25
55 53.5 – 56.5
60 58.5 – 61.5
65 63.5 – 66.5
70 68.5 – 71.5
75 73.5 – 76.5
80 78.5 – 81.5
85 83.25 – 86.75
90 88.25 – 91.75
95 93.25 – 96.75
100 98.25 – 101.75
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
155 151 – 159
160 156 – 164
165 161 – 169
170 166 – 174
175 171 – 179
180 176 – 184
185 180.4 – 189.6
190 185.4 – 194.6
195 190.4 – 199.6
200 195.4 – 204.6
Size sheet · DIN 7990
M12
ds shank diameter 12
s width across flats 19
e width across corners ≥ 20.88
k head height 8
b thread length 17.75
dw bearing face diameter ≥ 17.2
da transition diameter ≤ 14.7
c ≤ 0.6
r fillet radius ≥ 0.6
k´ ≥ 5.28 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 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120
Size sheet · DIN 7990
M16
ds shank diameter 16
s width across flats 24
e width across corners ≥ 26.17
k head height 10
b thread length 21
dw bearing face diameter ≥ 22
da transition diameter ≤ 18.7
c ≤ 0.8
r fillet radius ≥ 0.6
k´ ≥ 6.47 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 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150
Size sheet · DIN 7990
M20
ds shank diameter 20
s width across flats 30
e width across corners ≥ 32.95
k head height 13
b thread length 23.5
dw bearing face diameter ≥ 27.7
da transition diameter ≤ 24.4
c ≤ 0.8
r fillet radius ≥ 0.8
k´ ≥ 8.47 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 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 155 · 160 · 165 · 170 · 175
Size sheet · DIN 7990
M22
ds shank diameter 22
s width across flats 32
e width across corners ≥ 35.03
k head height 14
b thread length 25.5
dw bearing face diameter ≥ 29.5
da transition diameter ≤ 26.4
c ≤ 0.8
r fillet radius ≥ 0.8
k´ ≥ 9.17 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 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 155 · 160 · 165 · 170 · 175 · 180 · 185 · 190 · 195 · 200
Size sheet · DIN 7990
M24
ds shank diameter 24
s width across flats 36
e width across corners ≥ 39.55
k head height 15
b thread length 26
dw bearing face diameter ≥ 33.2
da transition diameter ≤ 28.4
c ≤ 0.8
r fillet radius ≥ 0.8
k´ ≥ 9.87 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 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 155 · 160 · 165 · 170 · 175 · 180 · 185 · 190 · 195 · 200
Size sheet · DIN 7990
M27
ds shank diameter 27
s width across flats 41
e width across corners ≥ 45.2
k head height 17
b thread length 29
da transition diameter ≤ 32.4
c ≤ 0.8
r fillet radius ≥ 1
k´ ≥ 11.27 Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Standard lengths
60 · 65 · 70 · 75 · 80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 155 · 160 · 165 · 170 · 175 · 180 · 185 · 190 · 195 · 200
Size sheet · DIN 7990
M30
ds shank diameter 30
s width across flats 46
e width across corners ≥ 50.85
k head height 19
b thread length 30.5
dw bearing face diameter ≥ 42.7
da transition diameter ≤ 35.4
c ≤ 0.8
r fillet radius ≥ 1
k´ ≥ 12.56 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
80 · 85 · 90 · 95 · 100 · 105 · 110 · 115 · 120 · 125 · 130 · 135 · 140 · 145 · 150 · 155 · 160 · 165 · 170 · 175 · 180 · 185 · 190 · 195 · 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: M30 ds: min 29.16 > max 27.84 in source — min/max omitted; M27 dw: value 0.8 breaks the size progression — omitted as a probable source typo