Tightening Torques And Initial-Tensioning Forces - Siemens FLENDER H SH Series Assembly And Operating Instructions Manual

6.22.2 Tightening torques and initial-tensioning forces

The tightening torques apply to friction coefficients of μ
coefficient μ
and dry, cut mating threads in steel or cast iron. Lubricants which alter the friction coefficient
must not be used and may overload the screw connection.
Table 25: Initial-tensioning forces and tightening torques for screw connections of strength classes 8.8;
10.9; 12.9 with a common friction coefficient of μ
Nominal Strength
thread
diameter of the bolt
d
mm
M10
M12
M16
M20
M24
M30
M36
M42
M48
M56
M64
M72x6
= 0.14 applies here to lightly oiled steel bolts, black­annealed or phosphatised
total
Initial-tensioning force
class for screw­connection classes
from table 24
C
8.8 18000
10.9 26400
12.9 30900
8.8 26300
10.9 38600
12.9 45100
8.8 49300
10.9 72500
12.9 85000
8.8 77000
10.9 110000
12.9 129000
8.8 109000
10.9 155000
12.9 181000
8.8 170000
10.9 243000
12.9 284000
8.8 246000
10.9 350000
12.9 409000
8.8 331000
10.9 471000
12.9 551000
8.8 421000
10.9 599000
12.9 700000
8.8 568000
10.9 806000
12.9 944000
8.8 744000
10.9 1060000
12.9 1240000
8.8 944000
10.9 1340000
12.9 1570000 1000000
BA 5030 en 02/2013
= 0.14
total
D E
F
M min.
N
11500 7200
16900 10600
19800 12400
16800 10500
24700 15400
28900 18100
31600 19800
46400 29000
54400 34000
49200 30800
70400 44000
82400 51500
69600 43500
99200 62000
116000 72500
109000 68000
155000 97000
182000 114000
157000 98300
224000 140000
262000 164000
212000 132000
301000 188000
352000 220000
269000 168000
383000 240000
448000 280000
363000 227000
516000 323000
604000 378000
476000 298000
676000 423000
792000 495000
604000 378000
856000 535000
628000
71 / 96
= 0.14. The friction
total
Tightening torque
for screw­connection classes
from table 24
C D
M
A
Nm
44.6 38.4
65.4 56.4
76.5 66.0
76.7 66.1
113 97.1
132 114
186 160
273 235
320 276
364 313
520 450
609 525
614 530
875 755
1020 880
1210 1040
1720 1480
2010 1740
2080 1790
2960 2550
3460 2980
3260 2810
4640 4000
5430 4680
4750 4090
6760 5820
7900 6810
7430 6400
10500 9090
12300 10600
11000 9480
15600 13500
18300 15800
15500 13400
22000 18900
25800 22200
E
34.3
50.4
58.9
59.0
86.6
101
143
210
246
280
400
468
470
675
790
930
1330
1550
1600
2280
2670
2510
3750
4180
3650
5200
6080
5710
8120
9500
8460
12000
14100
11900
16900
19800