Minimum Tire Lug Thread Engagement - Lightning Forum | LightningRodder.com
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post #1 of 33 (permalink) Old 07-08-2010, 08:21 PM Thread Starter
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Minimum Tire Lug Thread Engagement

After buying a set of new 16" 11" wide Bogart D-10 rear rim's and installing a 7/16th spacer due to tight tire clearence with the leaf springs, I noticed the lug's only go on a total of 6 turn's on the stock studs for a 2004 Lightning. They are open ended lug nutz that sit flush with the end of the stud when installed and torqued down (see pics). They torque up to spec, and seem very sturdy.

I heard the rule of thumb is that 2 threads should be showing thru the end of the lug nutz when properly torqued (using 100 ft lbs). I don't want to wreck myself , someone else, or the truck over something as basic as some lug's nut's that aren't engaging the thread's enough.

Seems like its on the minimum verge of being safe. Any thoughts?

Thanx

JT
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post #2 of 33 (permalink) Old 07-08-2010, 08:35 PM
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im pretty sure its either ihra or nhra rules or maybe both say that the stud has to come out so far past the lugs... i think its twice the with of the stud... that was the rule a long time ago. either way they dont work on your truck so just send me those useless wheels and il put them to use lol
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post #3 of 33 (permalink) Old 07-08-2010, 08:39 PM
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I've always heard the 2 full threads out rule

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post #4 of 33 (permalink) Old 07-08-2010, 09:28 PM
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From the NHRA rule book
The thread
engagement on all wheel studs to the lug nut, or lug bolt to wheel
hubs, must be equivalent to or greater than the diameter of the
stud. Length of the stud/bolt does not determine permissibility;
length of the engagement between the stud and lug determines
permissibility.

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Last edited by Scuba-Matt; 07-08-2010 at 09:40 PM.
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post #5 of 33 (permalink) Old 07-08-2010, 09:48 PM Thread Starter
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Quote:
Originally Posted by Scuba-Matt View Post
From the NHRA rule book
The thread
engagement on all wheel studs to the lug nut, or lug bolt to wheel
hubs, must be equivalent to or greater than the diameter of the
stud. Length of the stud/bolt does not determine permissibility;
length of the engagement between the stud and lug determines
permissibility.
WTF? In plain english........(BTW, thanks for the quote, just wish I was smart enuff to understand what it's trying to say) I finished in the bottom 15% of my high school class, but I did have good hand-eye coordination.

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post #6 of 33 (permalink) Old 07-08-2010, 10:51 PM
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Quote:
Originally Posted by Scuba-Matt View Post
From the NHRA rule book
The thread
engagement on all wheel studs to the lug nut, or lug bolt to wheel
hubs, must be equivalent to or greater than the diameter of the
stud. Length of the stud/bolt does not determine permissibility;
length of the engagement between the stud and lug determines
permissibility.

go look at ANY stock L rims with lugs.... and I bet the don't stick out that far!

soooo many rules in NHRA..

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post #7 of 33 (permalink) Old 07-08-2010, 11:02 PM
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damn it man if you have to get longer studs... thats a job in itself. looks like your in the market for some slightly narrower tires

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post #8 of 33 (permalink) Old 07-08-2010, 11:24 PM
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Quote:
Originally Posted by jwlast View Post
WTF? In plain english........(BTW, thanks for the quote, just wish I was smart enuff to understand what it's trying to say) I finished in the bottom 15% of my high school class, but I did have good hand-eye coordination.
It means that you need approximately 1/2" of threads showing through the nut on the stud.

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post #9 of 33 (permalink) Old 07-08-2010, 11:27 PM
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on aircraft... military aircraft capable of going Mach 2.5 and 9+ G's... rule is ALL hardware must protrude 2 to 3 threads past surface!

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post #10 of 33 (permalink) Old 07-09-2010, 12:09 AM
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The tech guys at my local track simply stated that the lugs had to extend past the nuts. If you're running slicks you're also required to use open ended lug nuts such as the ones you have pictured as well vs a set of closed ended such as the oem nuts. Open ended nuts aren't a requirement if running DOT tires but then the tech might want to inspect all of your lug bolts in order to ensure they're of a proper length so why chance it.

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post #11 of 33 (permalink) Old 07-09-2010, 12:14 AM
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Just cut the nut down.
















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post #12 of 33 (permalink) Old 07-09-2010, 05:48 AM
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As long as all the threads in the nut are engaged, you are fine. Should be fine with NHRA too. If there is any doubt, take your spacers to a machine shop and have them mill them down 1/16"-1/8"



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post #13 of 33 (permalink) Old 07-09-2010, 08:52 AM
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Quote:
Originally Posted by SHOKDU View Post
It means that you need approximately 1/2" of threads showing through the nut on the stud.
how i read that is that you need at least 14mm of threads engaging in the nut. if the stud is flush with the outside of the lug nut, and the lug nut is at least 14mm thick then you should be fine. you may have been saying the same thing, i couldn't really tell

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post #14 of 33 (permalink) Old 07-09-2010, 09:04 AM
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The rule means that if the stud is 1/2 thick that is how much must stick out past the lug nut. If the stud is 14mm thick (.55 inches), then 14mm 0r .55" must be visible past the nut.

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post #15 of 33 (permalink) Old 07-09-2010, 09:12 AM
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engagement does not mean protrusion. i disagree with your interpretation, respectfully of course.

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