Wheel studs and nuts for 12-bolt axles. - Chevelle Tech
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post #1 of 19 (permalink) Old Apr 29th, 19, 8:06 PM Thread Starter
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David
 
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Wheel studs and nuts for 12-bolt axles.

Hi,

My car had been damaged by the prior owner. He had to replace rear passenger side wheel and axle. I have after market rear disc brake and the stud that got installed seems too short, the thread are not longer than the nut. I want to replace studs and nut. I see a lot a of slightly different size for knurl diameter, ex: .487in, .472in, etc. Which one do I need if a have just a regular 12-bolt axle and what is the regular length for these studs so I can get longer ones.

I see a lot of different types of nut too. I seem to have regular 60 degree nut but it left weird wear marks on my wheels so I'm not sure I've got the right one for my rally wheels. Just looking at the nuts page on rockauto.com for my car makes my head spin. So much different types, acorn, bulge, flanged, mag with washer.....

What do I need?

Thanks
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1968 Chevelle 396 (bored 402) / 4-spd T-10 / 3.73
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post #2 of 19 (permalink) Old Apr 29th, 19, 10:02 PM
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Re: Wheel studs and nuts for 12-bolt axles.

You sure the "wear marks" weren't caused by a lug wrench or impact tool?

If the studs come all the way through the lug nuts, they are long enough.
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post #3 of 19 (permalink) Old Apr 29th, 19, 10:08 PM
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Re: Wheel studs and nuts for 12-bolt axles.

look like you have full engagement of the lug nuts...
looks correct in the photos...

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post #4 of 19 (permalink) Old Apr 30th, 19, 9:52 AM
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Re: Wheel studs and nuts for 12-bolt axles.

What kind of wheels?
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post #5 of 19 (permalink) Old Apr 30th, 19, 5:09 PM Thread Starter
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Re: Wheel studs and nuts for 12-bolt axles.

GM rally wheels

1968 Chevelle 396 (bored 402) / 4-spd T-10 / 3.73
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post #6 of 19 (permalink) Old Apr 30th, 19, 7:02 PM
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Re: Wheel studs and nuts for 12-bolt axles.

The Studs look long enough based on the Nut in the Upper Right Corner of your First Pic

To me it looks like the Studs are too Small in Diameter compared to the Wheel Stud Holes

If you have 7/16" Studs I would change them to 1/2" and also buy some 1/2" Nuts
https://www.jegs.com/c/Wheels-Tires_...900710&Tab=SKU



Or
try a set of these First https://www.jegs.com/i/Billet-Specia...99980/10002/-1 7/16" - 20 RH
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67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
Now 468/Th400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T S/R #6641 street Tires/Dress 2016/10/9
60' = 1.720
1/8 = 7.747 et / 89 mph
1/4 = 12.112 et / 112 mph
NEW Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph

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post #7 of 19 (permalink) Old Apr 30th, 19, 7:17 PM
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Re: Wheel studs and nuts for 12-bolt axles.

I'll second the vote for 1/2" studs. They clear stock wheels without issue.

And Allstar makes these oh-so-nice one inch wrenching conical nuts. They clear a stock Rally center cap.

You'll just need to get the axle & front hubs bored to accept the larger studs, not too easy but worth it. A tapered pin reamer works. And pull the studs in with a greased nut.
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post #8 of 19 (permalink) Old May 2nd, 19, 3:20 PM
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Re: Wheel studs and nuts for 12-bolt axles.

Quote:
Originally Posted by paul bell View Post
I'll second the vote for 1/2" studs...

You'll just need to get the axle & front hubs bored to accept the larger studs, not too easy but worth it. A tapered pin reamer works. And pull the studs in with a greased nut.
I disagree, to a point... IMO, 1/2" studs are usually unnecessary. Unless you have really high horsepower, great traction, and launching the car hard, the 7/16" studs should be fine... Typical street car with a nice BB, even a few occasional trips to the track, shouldn't be a problem. I'd consider picking up a set of ARP wheel studs, which should be superior to "stock"/replacement studs, but that's about it...

ALL my big block powered cars always ran stock diameter studs, and NEVER a problem... Even at the drag strip and autocross with sticky tires... and I drove them all HARD...


Now if it was a simple matter of pressing in 1/2" studs, then maybe, but boring the hubs, etc, just too much work and expense for most cars, IMO...


My '70 did have the 1/2" studs in the rear, but it was that way when I bought it...
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post #9 of 19 (permalink) Old May 2nd, 19, 8:14 PM Thread Starter
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David
 
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Re: Wheel studs and nuts for 12-bolt axles.

What's the difference between acorn and bulge type nut? They both seems pretty similar, which one should I use?

1968 Chevelle 396 (bored 402) / 4-spd T-10 / 3.73
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post #10 of 19 (permalink) Old May 3rd, 19, 11:06 AM
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Re: Wheel studs and nuts for 12-bolt axles.

Lug Nuts 1/2" Open End Bulge Acorn
https://www.jegs.com/i/JEGS/555/65202/10002/-1

Acorn Lug Nuts
https://www.jegs.com/i/JEGS/555/65252/10002/-1

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
Now 468/Th400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T S/R #6641 street Tires/Dress 2016/10/9
60' = 1.720
1/8 = 7.747 et / 89 mph
1/4 = 12.112 et / 112 mph
NEW Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph

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post #11 of 19 (permalink) Old May 3rd, 19, 4:30 PM Thread Starter
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Re: Wheel studs and nuts for 12-bolt axles.

Both styles can be use with my application?

1968 Chevelle 396 (bored 402) / 4-spd T-10 / 3.73
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post #12 of 19 (permalink) Old May 3rd, 19, 10:54 PM
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Re: Wheel studs and nuts for 12-bolt axles.

Yes

But since your Wheel Holes are so large/likely 1/2"+ compared to the Studs Size 7/16"
the difference should be addressed IMHO

Options;
A. STRONGEST put in 1/2" Studs and buy 1/2" Lug Nuts stronger and will fill in the Wheel Stud Holes more

B. CHEAPEST buy a set of these https://www.jegs.com/i/Billet-Specia...99980/10002/-1 $ 23.us
and see if they will fit into the Wheel Stud Hole & screw onto the current 7/16" Studs
PLUS MAKE SURE THE SHANK DOES NOT BOTTOM OUT AGAINST THE BRAKE DRUM
since the Steel Wheel is not Thick enough/as thick as the Shank on the ET Lug Nuts
NOTE you could always use a Thin Flat/Lock Type Washer to take up/make up the difference in Thickness

C. do B. and if the Wheel Stud Holes need to be enlarged a little drill them out a little to make the 7/16" ET Style Lug Nuts fit

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
Now 468/Th400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T S/R #6641 street Tires/Dress 2016/10/9
60' = 1.720
1/8 = 7.747 et / 89 mph
1/4 = 12.112 et / 112 mph
NEW Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph

Kirk's67SS is offline  
post #13 of 19 (permalink) Old May 4th, 19, 9:57 AM Thread Starter
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David
 
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Re: Wheel studs and nuts for 12-bolt axles.

Thanks for the info! I would not have thought the 1/2 holes in the wheels were much of an issue. If the wheel is being held on and centered by the conical part of the nut what's the difference? I've been looking up some wheels on the internet and none seems to have a spec for lug holes, as if they were all 1/2''.

1968 Chevelle 396 (bored 402) / 4-spd T-10 / 3.73
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post #14 of 19 (permalink) Old May 4th, 19, 6:57 PM
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Re: Wheel studs and nuts for 12-bolt axles.

Quote:
Originally Posted by davlac89 View Post
Thanks for the info! I would not have thought the 1/2 holes in the wheels were much of an issue. If the wheel is being held on and centered by the conical part of the nut what's the difference? I've been looking up some wheels on the internet and none seems to have a spec for lug holes, as if they were all 1/2''.
You are right... those larger holes in your wheel are NOT an issue...

Once you go RAT, you never go back...
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post #15 of 19 (permalink) Old May 4th, 19, 7:43 PM
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Re: Wheel studs and nuts for 12-bolt axles.

Your wheel studs are long enough to pass tech at an NHRA sanctioned track. They are required to reach into the hex portion of the out nut, the thickness of the stud, which these would. With rally or stock steel wheels you should never have an issue.

Steve R
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