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Author Topic: How much thread is to show past the 1" lug nuts  (Read 10192 times)

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Offline Bruno

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How much thread is to show past the 1" lug nuts
« on: June 22, 2009, 10:03:56 PM »
I have 1/2 bolts in my   C/GT Corvette, the 1" lugs fill all the threads with the tip of the bolt just at or slightly above the 1" lug nut.

Other classes of racing require a certain length of bolt to be exposed, I can not find this in the book, or searching the forum.

I see no issues with what I have, but I am sure there is an opinion on this at tech.
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Offline Glen

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Re: How much thread is to show past the 1" lug nuts
« Reply #1 on: June 22, 2009, 10:09:33 PM »
It's under wheels on pgs. 19 & 20 of the 2009 rule book. You need 5/8 in of thread into the nut, no acorn nuts allowed. :cheers:
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Offline hitz

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Re: How much thread is to show past the 1" lug nuts
« Reply #2 on: June 22, 2009, 11:49:04 PM »
Glen. The 1/2" x1" lugs I've seen and bought have a little over 11/16" of threads. Flush with the nut should do it.

Happy Birthday, Glen.

I'm late huh!

Harvey
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Offline jimmy six

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Re: How much thread is to show past the 1" lug nuts
« Reply #3 on: June 22, 2009, 11:58:21 PM »
back in the old days (not SCTA) when they wanted 2 threads past the lug nut; I ground the nuts down on my dads surface grinder and gave just what they wanted :evil:
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Offline Stan Back

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Re: How much thread is to show past the 1" lug nuts
« Reply #4 on: June 23, 2009, 12:37:58 AM »
Can count on you to follow the rules!
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Offline fastman614

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Re: How much thread is to show past the 1" lug nuts
« Reply #5 on: August 25, 2009, 11:19:03 PM »
Well, I am a tech inspector at Bonneville.... if at least ONE full thread is not visible beyond the nut, I ASK QUESTIONS.... If the thread is not at least flush with the outer edge of the nut, you WILL NOT pass tech.... unless, there is some serious mitigating factors, such as you custom made your own lug nuts and they are much longer than the ones you can purchase.... but then, i am an engineering technician and i understand strengths, stress loading etc....

However, I do not understand the concept that, every once in a while, people will show up at Bonneville who did not spend the 20 to 40 or so bucks that Summit or  any of the other mail order companies charge for a full set of longer studs....

In matters like this, I ask that you use a bit of wisdom and think about safety and what the potential alternative could be if your stock length lug stud does not  stay fully engaged with the nut....
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Offline SPARKY

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Re: How much thread is to show past the 1" lug nuts
« Reply #6 on: August 26, 2009, 08:53:17 AM »
Looks like I need to be buying some longer studs for my rear wheels :-D  mine are flush
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Offline jl222

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Re: How much thread is to show past the 1" lug nuts
« Reply #7 on: August 27, 2009, 04:11:44 PM »
Quote from: fastman614 on August 25, 2009, 11:19:03 PM
Well, I am a tech inspector at Bonneville.... if at least ONE full thread is not visible beyond the nut, I ASK QUESTIONS.... If the thread is not at least flush with the outer edge of the nut, you WILL NOT pass tech.... unless, there is some serious mitigating factors, such as you custom made your own lug nuts and they are much longer than the ones you can purchase.... but then, i am an engineering technician and i understand strengths, stress loading etc....

However, I do not understand the concept that, every once in a while, people will show up at Bonneville who did not spend the 20 to 40 or so bucks that Summit or  any of the other mail order companies charge for a full set of longer studs....

In matters like this, I ask that you use a bit of wisdom and think about safety and what the potential alternative could be if your stock length lug stud does not  stay fully engaged with the nut....

  fastman... the rule says 5/8 in of threads no mention of threads past nut. This rule [1 in lug nuts] is very confusing as [I believe it is for TAPERED lug nuts] not the type that are for the type of wheel we run with lug nuts that fit inside the wheel with almost 2 in of thread. MADE BY THE WHEEL MANUFACTURE TO EXACT SPECIFICTIONS AND HARDENDED. Racers are making up plates that space these lugs further from inside of wheel or having them made special that are not up to manufacture specs but SCTA spec.

      JL222

  PS an inspector called us on threads not past lug nuts at May El Mirage which is NO SUCH REQUIREMENT IN RULE BOOK
« Last Edit: August 27, 2009, 04:22:08 PM by jl222 »
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Offline Milwaukee Midget

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Re: How much thread is to show past the 1" lug nuts
« Reply #8 on: August 27, 2009, 04:52:45 PM »
Quote from: jl222 on August 27, 2009, 04:11:44 PM
Quote from: fastman614 on August 25, 2009, 11:19:03 PM
Well, I am a tech inspector at Bonneville.... if at least ONE full thread is not visible beyond the nut, I ASK QUESTIONS.... If the thread is not at least flush with the outer edge of the nut, you WILL NOT pass tech.... unless, there is some serious mitigating factors, such as you custom made your own lug nuts and they are much longer than the ones you can purchase.... but then, i am an engineering technician and i understand strengths, stress loading etc....

However, I do not understand the concept that, every once in a while, people will show up at Bonneville who did not spend the 20 to 40 or so bucks that Summit or  any of the other mail order companies charge for a full set of longer studs....

In matters like this, I ask that you use a bit of wisdom and think about safety and what the potential alternative could be if your stock length lug stud does not  stay fully engaged with the nut....

  fastman... the rule says 5/8 in of threads no mention of threads past nut. This rule [1 in lug nuts] is very confusing as [I believe it is for TAPERED lug nuts] not the type that are for the type of wheel we run with lug nuts that fit inside the wheel with almost 2 in of thread. MADE BY THE WHEEL MANUFACTURE TO EXACT SPECIFICTIONS AND HARDENDED. Racers are making up plates that space these lugs further from inside of wheel or having them made special that are not up to manufacture specs but SCTA spec.

      JL222

  PS an inspector called us on threads not past lug nuts at May El Mirage which is NO SUCH REQUIREMENT IN RULE BOOK


JL222

Just curious.  Are you using threaded shank nuts on alumimum wheels, ala centerline?
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Offline Stan Back

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Re: How much thread is to show past the 1" lug nuts
« Reply #9 on: August 27, 2009, 07:02:04 PM »
We've got long studs.  And 1" lug nuts with a taper on both sides (Speedway?).  Last year the inspector said I had them on backwards.  Must of been the end of a long day.  Then he checked my throttle return springs by having me floor the throttle and side step it.  Bang!  "Sounds like two springs to me," he said.  "No, it's three," I replied.

Stan
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Offline jl222

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Re: How much thread is to show past the 1" lug nuts
« Reply #10 on: August 27, 2009, 07:18:46 PM »
   Yes [Weld] and 11/4 in. washers with a spring load built in [ like a belvue washer]
   That's why I don't believe the 1 in. lug nut rule was ment for these types of lug nuts and should be clarified

                   JL222
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Offline Jonny Hotnuts

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Re: How much thread is to show past the 1" lug nuts
« Reply #11 on: August 27, 2009, 10:00:36 PM »
Grind off some of the nut if yer close. :evil:
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Offline Dean Los Angeles

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Re: How much thread is to show past the 1" lug nuts
« Reply #12 on: August 28, 2009, 12:08:24 AM »
Quote
PS an inspector called us on threads not past lug nuts at May El Mirage which is NO SUCH REQUIREMENT IN RULE BOOK

There doesn't have to be. The inspector can't do an engineering analysis on every nut and bolt, so the easy way to look at it is the nut was designed to have FULL thread engagement. If it doesn't, then you get to go back to the shop and fix it.
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Offline jl222

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Re: How much thread is to show past the 1" lug nuts
« Reply #13 on: August 28, 2009, 12:46:53 AM »
Quote from: Dean Los Angeles on August 28, 2009, 12:08:24 AM
Quote
PS an inspector called us on threads not past lug nuts at May El Mirage which is NO SUCH REQUIREMENT IN RULE BOOK

There doesn't have to be. The inspector can't do an engineering analysis on every nut and bolt, so the easy way to look at it is the nut was designed to have FULL thread engagement. If it doesn't, then you get to go back to the shop and fix it.

   Yea right grind the nut down now its better?
  The rules say 5/8 in of ingagement nothing about threads past nut. and you have inspectors making up there own rules? :roll:
  If SCTA wants threads showing past the nut put it in the rule book.
         JL222

    P.S.  fastman snd Dean you better go check the lug nuts on your trucks and passenger cars, might not be full ingagement-no threads
showing and ready to  fall off at any time. You and how many millions of cars? Better grind the acorn nut far enough so threads are past
it so you [will think its safer and better than the manufactures]

« Last Edit: August 28, 2009, 01:28:22 AM by jl222 »
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Offline jimmy six

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Re: How much thread is to show past the 1" lug nuts
« Reply #14 on: August 28, 2009, 11:33:38 AM »
Sounds like the 9Th Disrict Court of Appeals. Constitution We don't need no Stinking Constitiution...
Rulebook, We don't need no Stinking Rulebook. . . . . .

5/8" is 5/8" as I read it and did it when I inspected vehicles. My major concern were the washers or plates on alloy wheels and proper lugs on allow wheels with threads to ends when I learned about it how some were manufactured. I am sure there are still alloy whees with shank style wheels (ie Centerlines) without 1" outside measured wheels going over and setting records over 200 mph; most are 7/8" . There is a way to do it following the current rule book but for the most part it is not done. It take some inginuity and no I did come up with it. I saw it someone else car and asked the owner what they had done. I looked good to me and I used on my own vwehicle when I reached 200.

Steel wheels only needed to follow what are rules stated which is for over 200. Good Luck....JD
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