Metric thread with standard pitch
Thread
Class
Tightening torque
Max. assembly
pre-load
(µ
min
=0.12)
N
Nm
lbf-ft (lbf-in)
M8
(X1.25)
8.8
24.6
18.1
18600
10.9
36.1
26.6
27300
12.9
42.2
31.1
32000
M10
(X1.5)
8.8
48
35.4
29600
10.9
71
52.4
43400
12.9
83
61.2
50800
M12
(X1.75)
8.8
84
62
43000
10.9
123
90.7
63200
12.9
144
106.2
74000
M14
(X2)
8.8
133
98
59100
10.9
195
143.8
86700
12.9
229
168.9
101500
M16
(X2)
8.8
206
151.9
80900
10.9
302
222.7
118800
12.9
354
261
139000
M18
(X2.5)
8.8
295
217.6
102000
10.9
421
310.5
145000
12.9
492
363
170000
M20
(X2.5)
8.8
415
306
130000
10.9
592
436.6
186000
12.9
692
510.4
217000
M22
(X2.5)
8.8
567
418.2
162000
10.9
807
595
231000
12.9
945
697
271000
M24
(X3)
8.8
714
526.6
188000
10.9
1017
750.1
267000
12.9
1190
877.1
313000
14. Appendix
146
5902916
MDS 8.2/14.2/18.2/20.2