Dimensions mm · values as the standard states them Type A Type B and C
Size P s s b r d2 fit H9 d3 d3 M5 0.8 7.52 – 8
5.88 – 6
16
≈ 2.5
5
10.9 – 12
11.57
≤ 12
M6 1 8.52 – 9
6.85 – 7
18
≈ 4
6
12.9 – 14
13.57
≤ 14
M8 1.25 10.3 – 11
8.85 – 9
22
≈ 4
8
16.9 – 18
17.57
≤ 18
M10 1.5 13.3 – 14
11.82 – 12
26
≈ 4
10
18.7 – 20
19.48
≤ 20
M12 1.75 16.3 – 17
13.82 – 14
30
≈ 6
12
23.7 – 25
24.48
≤ 25
M16 2 18.16 – 19
16.82 – 17
38
≈ 6
16
30.4 – 32
31.38
≤ 32
M20 2.5 23.16 – 24
21.79 – 22
46
≈ 6
18
38.4 – 40
39.38
≤ 40
M24 3 27.16 – 28
24.79 – 25
54
≈ 10
22
43.4 – 45
44.38
≤ 45
(M27) 3 29.16 – 30
26.79 – 27
—
≈ 10
24
48.4 – 50
49.38
≤ 50
M30 3.5 33 – 34
29.79 – 30
66
≈ 10
27
53.1 – 55
54.26
≤ 55
(M33) 3.5 37 – 38
33.75 – 34
—
≈ 16
30
58.1 – 60
59.26
≤ 60
M36 4 40 – 41
37.75 – 38
—
≈ 16
32
63.1 – 65
64.26
≤ 65
(M39) 4 45 – 46
40.75 – 41
—
≈ 16
35
68.1 – 70
69.26
≤ 70
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
90 88.25 – 91.75
100 98.25 – 101.75
110 108.25 – 111.75
120 118.25 – 121.75
130 128 – 132
140 138 – 142
150 148 – 152
160 156 – 164
180 176 – 184
200 195.4 – 201.6
220 215.4 – 224.6
240 235.4 – 244.6
260 254.8 – 265.2
280 274.8 – 285.2
300 294.8 – 305.2
Size sheet · DIN 444
M5
s width across flats 7.52 – 8
s width across flats 5.88 – 6
b thread length 16
r fillet radius ≈ 2.5
d2 diameter of the eye (fit H9) 5
d3 head diameter 10.9 – 12
d3 head diameter 11.57 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
30 · 35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80
Size sheet · DIN 444
M6
s width across flats 8.52 – 9
s width across flats 6.85 – 7
b thread length 18
r fillet radius ≈ 4
d2 diameter of the eye (fit H9) 6
d3 head diameter 12.9 – 14
d3 head diameter 13.57 Thread · ISO 261/262
Pitch P 1
d2 5.35
d3 4.773
Tap drill 5
Stress area As 20.12 mm² Standard lengths
35 · 40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90
Size sheet · DIN 444
M8
s width across flats 10.3 – 11
s width across flats 8.85 – 9
b thread length 22
r fillet radius ≈ 4
d2 diameter of the eye (fit H9) 8
d3 head diameter 16.9 – 18
d3 head diameter 17.57 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
40 · 45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120 · 130 · 140
Size sheet · DIN 444
M10
s width across flats 13.3 – 14
s width across flats 11.82 – 12
b thread length 26
r fillet radius ≈ 4
d2 diameter of the eye (fit H9) 10
d3 head diameter 18.7 – 20
d3 head diameter 19.48 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
45 · 50 · 55 · 60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150
Size sheet · DIN 444
M12
s width across flats 16.3 – 17
s width across flats 13.82 – 14
b thread length 30
r fillet radius ≈ 6
d2 diameter of the eye (fit H9) 12
d3 head diameter 23.7 – 25
d3 head diameter 24.48 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
55 · 60 · 65 · 70 · 75 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 180 · 200 · 220 · 240 · 260
Size sheet · DIN 444
M16
s width across flats 18.16 – 19
s width across flats 16.82 – 17
b thread length 38
r fillet radius ≈ 6
d2 diameter of the eye (fit H9) 16
d3 head diameter 30.4 – 32
d3 head diameter 31.38 Thread · ISO 261/262
Pitch P 2
d2 14.701
d3 13.546
Tap drill 14
Stress area As 156.67 mm² Standard lengths
70 · 75 · 80 · 90 · 100 · 110 · 120 · 130 · 140 · 150 · 160 · 180 · 200 · 220 · 240 · 260
Size sheet · DIN 444
M20
s width across flats 23.16 – 24
s width across flats 21.79 – 22
b thread length 46
r fillet radius ≈ 6
d2 diameter of the eye (fit H9) 18
d3 head diameter 38.4 – 40
d3 head diameter 39.38 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
100 · 110 · 120 · 130 · 140 · 150 · 160 · 180 · 200 · 220 · 240 · 260
Size sheet · DIN 444
M24
s width across flats 27.16 – 28
s width across flats 24.79 – 25
b thread length 54
r fillet radius ≈ 10
d2 diameter of the eye (fit H9) 22
d3 head diameter 43.4 – 45
d3 head diameter 44.38 Thread · ISO 261/262
Pitch P 3
d2 22.051
d3 20.319
Tap drill 21
Stress area As 352.5 mm² Standard lengths
100 · 110 · 120 · 130 · 140 · 150 · 160 · 180 · 200 · 220 · 240 · 260
Size sheet · DIN 444
M27
s width across flats 29.16 – 30
s width across flats 26.79 – 27
r fillet radius ≈ 10
d2 diameter of the eye (fit H9) 24
d3 head diameter 48.4 – 50
d3 head diameter 49.38 Thread · ISO 261/262
Pitch P 3
d2 25.051
d3 23.319
Tap drill 24
Stress area As 459.41 mm² Standard lengths
120 · 130 · 140 · 150 · 160 · 180 · 200 · 220 · 240 · 260 · 280 · 300
Size sheet · DIN 444
M30
s width across flats 33 – 34
s width across flats 29.79 – 30
b thread length 66
r fillet radius ≈ 10
d2 diameter of the eye (fit H9) 27
d3 head diameter 53.1 – 55
d3 head diameter 54.26 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
150 · 160 · 180 · 200 · 220 · 240 · 260 · 280 · 300
Size sheet · DIN 444
M33
s width across flats 37 – 38
s width across flats 33.75 – 34
r fillet radius ≈ 16
d2 diameter of the eye (fit H9) 30
d3 head diameter 58.1 – 60
d3 head diameter 59.26 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
150 · 160 · 180 · 200 · 220 · 240 · 260 · 280 · 300
Size sheet · DIN 444
M36
s width across flats 40 – 41
s width across flats 37.75 – 38
r fillet radius ≈ 16
d2 diameter of the eye (fit H9) 32
d3 head diameter 63.1 – 65
d3 head diameter 64.26 Thread · ISO 261/262
Pitch P 4
d2 33.402
d3 31.093
Tap drill 32
Stress area As 816.72 mm² Standard lengths
160 · 180 · 200 · 220 · 240 · 260 · 280 · 300
Size sheet · DIN 444
M39
s width across flats 45 – 46
s width across flats 40.75 – 41
r fillet radius ≈ 16
d2 diameter of the eye (fit H9) 35
d3 head diameter 68.1 – 70
d3 head diameter 69.26 Thread · ISO 261/262
Pitch P 4
d2 36.402
d3 34.093
Tap drill 35
Stress area As 975.75 mm² Standard lengths
160 · 180 · 200 · 220 · 240 · 260 · 280 · 300
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) 4 value(s) omitted after consistency checks: M27 b: value 6 breaks the size progression — omitted as a probable source typo; M33 b: value 3.5 breaks the size progression — omitted as a probable source typo; M36 b: value 4 breaks the size progression — omitted as a probable source typo; M39 b: value 4 breaks the size progression — omitted as a probable source typo