Lubed bolt vs. dry bolt; reduce torque 20-25%..... - Saab General Bulletin Board - Saabnet.com
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Lubed bolt vs. dry bolt; reduce torque 20-25%.....
Posted by REM in Seattle (more from REM in Seattle) on Fri, 8 Dec 2000 11:40:23
In Reply to: Lug bolt protocol, Bill S
[Profile/Gallery]
, Thu, 7 Dec 2000 23:52:18
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Oil or anti-seize on the lug bolt threads is a good idea to prevent seizing and thread damage. Anti-seize on the hub is a MUST to prevent the rim from seizing to the hub due to rust.
A lubricated bolt should be torqued approx. 20-25% less than a dry bolt. So IF the dry lug bolt was speced at 90 ft-lb, then an anti-seize coated bolt would be torqed at 68-72 ft-lb. That is a lubricated bolt will require less torque to provide the same clamping force.
According to my reference tables; the recommended torque for a 1/2-13 grade 8 bolt is 86-119 ft-lb dry and 65-89 ft-lb lubricated.
Now the real question is what does SAAB recommend as the torque for the lug bolts and is it for dry or lubricated lug bolts? I seem to remember that the SAAB maintenance manual recommends a few drops of oil on the lug bolts. In that case the torque would be about the same for oiled lug bolts or anti-seize coated lug bolts.
Anybody out there with the information, does SAAB spec lubed or dry torque for the lug bolts?
Posts in this Thread:
- Lug bolt protocol, Bill S
, Thu, 7 Dec 2000 23:52:18- Re: Lug bolt protocol.......epilogue, Bill S
, Sat, 9 Dec 2000 22:54:38 - Re: Lug bolt protocol, Dean, Fri, 8 Dec 2000 15:55:12
- Lubed bolt vs. dry bolt; reduce torque 20-25%....., REM in Seattle, Fri, 8 Dec 2000 11:40:23 <-- Viewing This Message
- Re: Lug bolt protocol, Joe
, Fri, 8 Dec 2000 07:01:54
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