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Metric coarse threads

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Tensile strength (min. ultimate tensile strength, yield strength) – metric coarse threads

Min. ultimate tensile strength, kN, metric ISO coarse thread

Thread Nominal stress area mm² Property class
4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9
Min. ultimate tensile strength (As * Rm) N
M3
M3,5
M4		 5,03
6,78
8,78		 2,01
2,71
3,51		 2,11
2,85
3,69		 2,51
3,39
4,39		 2,62
3,53
4,57		 3,02
4,07
5,27		 4,02
5,42
7,02		 4,53
6,10
7,90		 5,23
7,05
9,13		 6,14
8,27
10,7
M5
M6
M7		 14,2
20,1
28,9		 5,68
8,04
11,6		 5,96
8,44
12,1		 7,10
10
14,4		 7,38
10,4
15		 8,52
12,1
17,3		 11,35
16,1
23,1		 12,8
18,1
26		 14,8
20,9
30,1		 17,3
24,5
35,3
M8
M10
M12		 36,6
58
84,3		 14,6ᵃ
23,2ᵃ
33,7		 15,4
24,4
35,4		 18,3ᵃ
29ᵃ
42,2		 19
30,2
43,8		 22
34,8
50,6		 29,2ᵃ
46,4ᵃ
67,4ᵇ		 32,9
52,2
75,9		 38,1ᵃ
60,3ᵃ
87,7		 44,6
70,8
103
M14
M16
M18		 115
157
192		 46,0
62,8
76,8		 48,3
65,9
80,6		 57,5
78,5
96		 59,8
81,6
99,8		 69
94
115		 92ᵇ
125ᵇ
159		 104
141
-		 120
163
200		 140
192
234
M20
M22
M24		 245
303
353		 98
121
141		 103
127
148		 122
152
176		 127
158
184		 147
182
212		 203
252
293		 -
-
-		 255
315
367		 299
370
431
M27
M30
M33		 459
561
694		 184
224
278		 193
236
292		 230
280
347		 239
292
361		 275
337
416		 381
466
576		 -
-
-		 477
583
722		 560
684
847
M36
M39		 817
976		 327
390		 343
410		 408
488		 425
508		 490
586		 678
810		 -
-		 850
1 020		 997
1 200

a) For hot dip galvanised fasteners with thread tolerance 6 az according to ISO 965-4, reduced values apply according to ISO 10684:2004
b) For structural bolts, 70 kN (M12) 95.5 kN (M14) and 130 kN (M16) apply


Nominal yield strength, kN, metric ISO coarse thread

Thread

Pitch mm

Nominal stress area
mm²

Proof stress ReL N/mm²                                                        Proof stress Rp0.2 N/mm²

180

240

320

300

400

480

640

900

1080

Property class

3.6

4.6

4.8

5.6

5.8

6.8

8.8

10.9

12.9

M3
M3.5
M4

0.5
0.6
0.7

5.03
6.78
8.78

0.905
1.22
1.58

1.21
1.63
2.11

1.61
2.17
2.81

1.51
2.03
2.63

2.01
2.71
3.51

2.41
3.25
4.21

3.22
4.34
5.62

4.53
6.10
7.90

5.43
7.32
9.48

M5
M6
M7

0.8
1
1

14.2
20.1
28.9

2.56
3.62
5.20

3.41
4.82
6.94

4.54
6.43
9.25

4.26
6.03
8.67

5.68
8.04
11.6

6.82
9.65
13.9

9.09
12.9
18.5

12.8
18.1
26.0

15.3
21.7
31.2

M8
M10
M12

1.25
1.5
1.75

36.6
58.0
84.3

6.59
10.4
15.2

8.78
13.9
20.2

11.7
18.6
27.0

11.0
17.4
25.3

14.6
23.2
33.7

17.6
27.8
40.5

23.4
37.1
54.0

32.9
52.2
75.9

39.5
62.6
91.0

M14
M16
M18

2
2
2.5

115
157
192

20.7
28.3
34.6

27.6
37.7
46.1

36.8
50.2
61.4

34.5
47.1
57.6

46.0
62.8
76.8

55.2
75.4
92.2

73.6
100
123

104
141
173

124
170
207

M20
M22
M24

2.5
2.5
3

245
303
353

44.1
54.5
63.5

58.8
72.7
84.7

78.4
97.0
113

73.5
90.9
106

98.0
121
141

118
145
169

157
194
226

220
273
318

265
327
381

M27
M30
M33

3
3.5
3.5

459
561
694

82.6
101
125

110
135
167

147
180
222

138
168
208

184
224
278

220
269
333

294
359
444

413
505
625

496
606
750

M36
M39

4
4

817
976

147
176

196
234

261
312

245
293

327
390

392
468

523
625

735
878

882
1050