blackbetty14
Senior Member
- Joined
- Oct 23, 2014
- Posts
- 2,701
- Reaction score
- 1,425
- Location
- CT
- Ram Year
- 2024
- Engine
- Hemi 5.7 VVT/Etorque
The torque values listed in the owners/shop manual are dry torque numbers, unless otherwise noted. By reducing the friction of the lugnut to stud by applying a wet compound, you are essentially reducing the Run-on torque and increasing the clamp on force. It might not be enough to cause an issue, but you are technically over torquing the fastener.
This reminds me of a story shared by a fellow aircraft technician. While building up Q400 aircraft wheels in the backstop, the required anti-size used for the wheel tie bolts was not available. The airline engineer was contacted, and promptly recommended an alternate anti-size product. The technician proceeded to assemble several wheel assemblies that day with the newly recommended anti-seize. Several weeks later, there were 2 catastrophic wheel failures upon landing. An investigation concluded that the wheel tie bolts had been over torqued due to use of the improper anti seize compound. The engineer neglected to look up the difference in friction coefficient between the two compounds, this difference was enough to cause a clamp force difference that ultimately caused a failure. The engineer was fired on the spot.
If you do insist in using anti-seize in your lugnuts, I would recommend torquing it to the lower end of the torque range.
While I agree that a wet lube will cause less friction and thus alter the tq value your missing a key point of friction that will go in touched. I've built a few engines (not two but more like 8) and these are all high performance V8s in the past 15 or so years. I'm very aware of tq specs changing with lubricants and I would stress that the use on certain things would require tq value adjusting. The main thing with the lube are its properties and how it's being applied. Say for instance the use of motor oil on a head bolts threads would require a slightly different tq value than that of a dry bolt. The same head bolt with a moly lubricant (not a standard antiseize) on the threads would also require a slightly different tq rating. But once you apply lube to the underside of the head bolt (and washer if used) would creat the MOST noticeable decrease in tq bolt rating. This is due to the HUGE amount of friction created at the head of the bolt to the mating surface and this is usually much more than the threads.
So to sum this up... applying antiseize to lug threads could result in a small reduction in tq spec (not enough to warrant a change) but if I also applied antiseize to the cone of the lug nut and the area it contacts the rim material then I would have decreased the tq value. Since I did not and no one ever does this doesn't create that much of a reduction in tq value and I would rather my wheels tight vs loose. Let's not even mention that wheel studs are rated at minimum 10.9 or grade 8 and they are a big ass 14mm stud. You couldn't snap that with 130 ft lbs if you wanted to. I tq all my 12mm wheel studs to 100ftlbs even with spacers.
I think your over thinking this honestly. Antiseize on the threads will make your life easier upon removal period. Ever have to burn a lug nut out when the wheel stuck on the car? Kiss the wheel goodbye.