Wheel stud size?
Thread Starter
Pro
Joined: Jan 2000
Posts: 670
Likes: 0
From: Madison AL
Wheel stud size?
Any one know the stock wheel stud size? Or more importantly what size to buy for longer replacments? Jegs mentions knurl, not sure what that is.
For example:
.580'' Knurl; 7/16''-20 press-in stud features a .580'' knurl, will fit most late GM disc brake and early drum brake applications. 2-7/8'' long.
:confused:
For example:
.580'' Knurl; 7/16''-20 press-in stud features a .580'' knurl, will fit most late GM disc brake and early drum brake applications. 2-7/8'' long.
:confused:
Melting Slicks
Joined: Aug 2000
Posts: 2,310
Likes: 1
Re: Wheel stud size? (69Roadster)
I'm not sure if this will help any, but the specification in my '77 Corvette Specifications Booklet (FREE from Chevy by calling 800-222-1020) says "hex nut, 7/16-20 UNF 2-B". I have no idea what the UNF 2-B means.
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,989
From: Connecticut, USA
Re: Wheel stud size? (69Roadster)
I just bought replacement studs at NAPA last week. I have the rear spindles out and had to remove the studs because I couldn't get the spindle in a lathe with them in. I had to press them out and will use a press to install them. Under the head where the stud is in the spindle flange , the studs have a striaght knurl on them to keep them from spinning. These are like the upper front A arm studs that go through the arm cross shaft. I decided to replace the studs because the knurl was a little flattened out from pressing them out. I probably could have reused them by didn't want to take a chance.
They are 7/16-20(fine thread)x1.750" or 2" I'd have to check if you want, or try NAPA. They might have longer ones if you want?
Gary
They are 7/16-20(fine thread)x1.750" or 2" I'd have to check if you want, or try NAPA. They might have longer ones if you want?
Gary
Thread Starter
Pro
Joined: Jan 2000
Posts: 670
Likes: 0
From: Madison AL
Re: Wheel stud size?
Well looks likes 7/16"-20 is the thread size for sure. Thanks. Is the measurement Jegs gives for knurl the diameter of the stud? There two sizes .486'' and .580''. My stock studs are definitely less than 1/2 inch diameter. I guess that the .486" knurl would fit?
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,989
From: Connecticut, USA
Re: Wheel stud size? (69Roadster)
Sounds like the length of the knurl to me, either under over 1/2". Maybe they're for different flange thicknesses? If I think of it I'll "mike" up an original 72 stud tomorrow for you to compare.
Gary
Gary
Burning Brakes
Joined: Aug 2000
Posts: 925
Likes: 1
From: LT1 and LS5 Coupes... New Orleans, LA
Re: Wheel stud size? (69Roadster)
The parts manual is showing the overall length of the stud at 2 inches, with the usable length at 1.75 inches from the back side of the head to the tip of the threads. It is showing the knurled portion at 1/8 inch; I thought the knurled portion was more like 1/4 inch but that's what the book says. Being a little long with the knurling should not hurt anything. And like the rest have said, they are showing 7/16 x 20 threads.
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Re: Wheel stud size? (69Roadster)
I upgraded to 1/2 inch after stripping a few nuts by torquing to 85 ft-lbs. I built a special jig that bolts to the wheel and allows you to drill the studs out to a larger size while guiding the drill bit to keep it straight. I was able to install 1/2 by 3 inch studs on the car that did not have backing plates without removeing the axles.
Burning Brakes
Joined: Dec 2000
Posts: 962
Likes: 0
From: Carlisle PA
Re: Wheel stud size? (69Roadster)
What he is referring to is the portion of the lugnut that holds it in place (on the rotor) called the "Knurl". You or someone here will have to pop a wheel stud and measure (using a micrometer) directly behind where the threads stop for the lugnut. And it's not the length, it's the thickness of it.
Measure the thickness of the portion of that stud that has horizontal lines.
_
| |--------
| |--------|||||||||||||||||
| |--------|||||||||||||||||
| |--------|||||||||||||||||
| |--------
|_|
It's the actual part of the wheel stud that gets pressed/hammered into the rotor to hold it in place.
Yes, I know my drawing is crude... :cool:
[Modified by 70PurpleLS7, 10:36 AM 1/10/2002]
Measure the thickness of the portion of that stud that has horizontal lines.
_
| |--------
| |--------|||||||||||||||||
| |--------|||||||||||||||||
| |--------|||||||||||||||||
| |--------
|_|
It's the actual part of the wheel stud that gets pressed/hammered into the rotor to hold it in place.
Yes, I know my drawing is crude... :cool:
[Modified by 70PurpleLS7, 10:36 AM 1/10/2002]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Tech Contributor
Joined: Aug 1999
Posts: 15,175
Likes: 3,989
From: Connecticut, USA
Re: Wheel stud size? (70PurpleLS7)
Ok here's the poop! As Allen said, the studs are 1.750" from under the head to the end of the thread, 1.920" overall. 7/16x20 thread. Knurl is .140" long and the diameter of the bolt at the knurl is .455" to .457" , I only checked 2 studs.
7/16's is .437" so about .020" interference fit to lock the knurl into the flange, that's why I had to pop them out in a press.
Gary
7/16's is .437" so about .020" interference fit to lock the knurl into the flange, that's why I had to pop them out in a press.
Gary
