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.
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