Thread: Diff swap
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Old 01-23-2006, 04:31 AM   #6
TurDz
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Suspension bolts w/ antiseize = bad idea (in the wrong hands)

I am very concerned with the use of anti-seize on studs, bolts, whatever it is.

I remember reading from a source that you can run into problems using anti-seize since it can actually act as a lubricant. For a dry bolt, a good portion of the torque value (read from your torque wrench) comes from the actual friction in the nut and the bolt. When you lubricate that bolt, you effectively reduce that friction, and many times you can overtorque that bolt if the same "dry" torque value is used on a lubricated connection.

The thread below is extremely helpful and convincing:

http://forums.corner-carvers.com/showthread.php?t=10758

If you read through the whole thread, at least three people have found out that under certain circumstances, the tension on a bolt can be up to twice the amount for a lubricated connection compared to a dry connection! This is very important in terms of safety and the failure of bolted surfaces.

I just wanted to let you guys know why you should be careful with any type of lubricant. Anti-seize is actually a very good lubricant. I am not sure if torque specs for specific bolts are for wet or dry, but most likely, they should be assumed to be dry and clean.

As a general rule, torque specs from any manual should be used on CLEAN and DRY bolts, no lubricant. If lubricant is added, then you will need to use appropriate equations and calcuations to correct for the lack of friction on the threads.

As P-51 of that thread says, "So, lubrication is good, but you have to know what your wet torque should be. Don't use the dry torque!"
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