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 Post subject: Lug nut & wheel bolt torque
PostPosted: Fri Mar 06, 2009 9:47 pm 
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Joined: Thu Aug 28, 2003 8:14 pm
Posts: 832
I happened to be doing some research on fastener torque for the engineering firm where I work and remembered a string of emails from the early days of the club list server. The discussion revolved around the practice of applying anti-seize to wheel lugs. Here is a link to a web site with a technical article on bolt torque. The basic rule is that if the torque value is specified with dry threads, you must de-rate the torque value if you use lubricant otherwise the bolt pre-load tension will be too great and may exceed the bolt strength.
Bolts are "best" when torqued to 75% of their proof load. Using lubricant can easily increase the bolt tension by 25% causing the bolt to be near failure.
[url]
http://www.zerofast.com/torque.htm [/url]

Let the debating begin!
Charlie Guthrie

_________________
1998 BMW Z3
1987 BMW 325is
2000 BMW
1996 F250 Turbo Diesel


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