Stpman
Well-known member
The teams used to glue them on, I have a couple at home my wife picked up one visit to the Penski shops look like a oversized nut for 1/2" stud
To lube wheel studs or not, that is the question
- Thread starter clutchdust
- Start date
The teams used to glue them on, I have a couple at home my wife picked up one visit to the Penski shops look like a oversized nut for 1/2" stud
Luke@tirerack
New member
Anti-sieze on a lug bolt is a very bad idea !!!
Here's why: Bolts or studs provide clamping force by being purposely stretched. Most torque specs bring a bolt well within its elastic limit. Then when loosened they will return to their original length and can be safely reused (Some bolts, including many head bolts, are purposely stretched past their elastic limit, and can not be reused). The torque wrench is the most convenient-but not the most accurate-method of properly stretching
automotive bolts. Engineers spend hours correlating the proper bolt stretch to the required turning effort.
About 90% of a torque specification is used to overcome friction; only 10% of the specified twisting effort provides clamping force. It is no surprise then that most lubricant tables recommend a 40-45% reduction of applied torque when using
anti-sieze on a bolt. So, a lugbolt coated with anti-sieze should be tightened to a maximum of 49 ft-lbs. Tightening this lugnut to 85 ft-lbs. means it is now over-torqued by 73%! Considering that most torque specs stretch a bolt to within 70% of its elastic limit, over-torquing by 73% will easily send the bolt or stud well beyond its elastic limit-and could be dangerously close to its failure point.
For this reason I would suggest to all forum members to never use anti-seize on your lug hardware.
Here's why: Bolts or studs provide clamping force by being purposely stretched. Most torque specs bring a bolt well within its elastic limit. Then when loosened they will return to their original length and can be safely reused (Some bolts, including many head bolts, are purposely stretched past their elastic limit, and can not be reused). The torque wrench is the most convenient-but not the most accurate-method of properly stretching
automotive bolts. Engineers spend hours correlating the proper bolt stretch to the required turning effort.
About 90% of a torque specification is used to overcome friction; only 10% of the specified twisting effort provides clamping force. It is no surprise then that most lubricant tables recommend a 40-45% reduction of applied torque when using
anti-sieze on a bolt. So, a lugbolt coated with anti-sieze should be tightened to a maximum of 49 ft-lbs. Tightening this lugnut to 85 ft-lbs. means it is now over-torqued by 73%! Considering that most torque specs stretch a bolt to within 70% of its elastic limit, over-torquing by 73% will easily send the bolt or stud well beyond its elastic limit-and could be dangerously close to its failure point.
For this reason I would suggest to all forum members to never use anti-seize on your lug hardware.
turtlevette
The Turdle
What about grease? Where i live, everything corrodes. My old 3/4 ton suburban needs something or they weld on.
1Michel
Well-known member
Stpman
Well-known member
It would be the same thing the grease would lessen the drag the same as the never sieze
clutchdust
Millionaire Playboy
Ok, Luke, thanks for the informed reply. But what if you did take into account that effect? Is there any reason you couldn't? We have some pretty bright people on this forum, I'm sure a few of them could come up with a "wet" torque spec. So, just a hypothetical, say we determine that a wheel that is supposed to be torqued to 100ft/lbs dry calculates to 65ft/lbs lubed (hypothetically). Then is there a legitimate reason not to?
I mean hell, I just assembled two engines in the last week and lubed the rod and main bolts. Are you telling me wheel studs see RADICALLY different loads?
I mean hell, I just assembled two engines in the last week and lubed the rod and main bolts. Are you telling me wheel studs see RADICALLY different loads?
doingMach1
Member
- Joined
- Aug 24, 2011
- Messages
- 23
Just jumping in so I can continue to read about this subject. I have always been very meticulous about torque specs (although never used grease or anti-seize on wheel studs).....
clutchdust
Millionaire Playboy
I'm like that too. I bought a Proto torque wrench that was on sale for $160 so I had the best tools I could afford. That, and I know how to use it. Use to drive me crazy to go to a tire store and see the idiot bounce of the torque wrench and tell me it's all good. :banghead:
doingMach1
Member
- Joined
- Aug 24, 2011
- Messages
- 23
Yeah!! That drives me crazy! I just had my car in the shop and they gave it back with my black lugnuts all scraped up! I use the torque wrench and a spark plug ratchet end....I even wrapped it with electrical tape so the outside wouldn't scuff the wheel!
I know, I know.....go ahead and make fun!
