Slew Drives
Installation and commissioning
28
Tightening torques and bolt tightening forces for inch
thread in accordance with ANSI B1.1 when using a torque
wrench:
Tightening torque
M
A
1)
Strength class
Grade 8
in
Mounting
pretension force
F
M
2)
Strength class
Grade 8
in
Mounting bolt
dimensions
Nm
ft-lbs
kN
lbs
0.1900 – 24 UNC
4.80
3.54
7.15
1607
0.2160 – 24 UNC
7.69
5.67
10.1
2271
1/4 – 20 UNC
11.7
8.6
13.2
2967
5/16 – 18 UNC
24.4
18.0
22.1
4968
3/8 – 16 UNC
43.7
32.2
33.0
7419
7/16 – 14 UNC
70.1
51.7
45.4
10206
1/2 – 13 UNC
108
80
61.0
13713
9/16 –12 UNC
156
115
78.6
17670
5/8 – 11 UNC
216
159
97.8
21986
3/4 – 10 UNC
386
285
146
32822
7/8 – 9 UNC
625
461
202
45411
1 – 8 UNC
938
692
266
59799
1 1/8 – 7 UNC
1328
979
334
75086
1 1/4 – 7 UNC
1889
1393
428
96218
Tab. 9
1)
M
A
in accordance with VDI guideline 2230 (February 2003) for
µK=0.08 and µG=0.12
2)
F
M
in accordance with VDI guideline 2230 (February 2003) for
µG=0.12
For mounting bolts from M30 or 1 1/8 - 7 UNC use a hydraulic
bolt-tensioning cylinder (
chapter 5.2.6 "Tightening bolts with
a hydraulic bolt-tensioning cylinder").
When using bolts with fine-pitched thread or other bolt sizes or
qualities, please contact our customer service (
page 2).
For further information about bolts, please refer to the IMO
main catalogues.
5.2.6
Tightening bolts with a hydraulic bolt-tensioning cylinder
Comply with the instructions provided in the operating manual
for the hydraulic fixture! The operating manual for the hydraulic
bolt-tensioning cylinder specifies how the hydraulic pressure is
converted to the pretension force.