Coarse vs. Fine Wheel Studs
Lead Driver
Joined: Jun 2007
Posts: 6,757
Likes: 5
From: Corvallis, OR
And don't forget they have 5% off to forum members, here is the thread with the current code:
https://www.ford-trucks.com/forums/1...04-2011-a.html
https://www.ford-trucks.com/forums/1...04-2011-a.html
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 26
From: Mesa AZ
Thanks for the help. I'm definitely a Timken guy, just replaced one on my wife's trailblazer and the lady at Autozone told me her husband forbids her from bringing home Duralast even with her discount, lol. Off to bed but I will definitely check out Rock Auto. How do you order from them through here or is there a discount code?
New User
Joined: Oct 2011
Posts: 7
Likes: 0
The reason for the metric thread studs are for tourque rating
As for a 4x4 or 8 lug. It is bigger in size than the coarse thread for that reason
The coarse thread will have a lower torque sheer rating and will not fit in the bigger metric stud holes.
Fine threads will have a 6-10% increase in efective stress area of thread on comparison to coarse thread
And will have more thread area in one inch than a coarse thread stud
As for a 4x4 or 8 lug. It is bigger in size than the coarse thread for that reason
The coarse thread will have a lower torque sheer rating and will not fit in the bigger metric stud holes.
Fine threads will have a 6-10% increase in efective stress area of thread on comparison to coarse thread
And will have more thread area in one inch than a coarse thread stud
Thread Starter
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Senior User
Joined: Feb 2011
Posts: 343
Likes: 0
From: maine
The reason for the metric thread studs are for tourque rating
As for a 4x4 or 8 lug. It is bigger in size than the coarse thread for that reason
The coarse thread will have a lower torque sheer rating and will not fit in the bigger metric stud holes.
Fine threads will have a 6-10% increase in efective stress area of thread on comparison to coarse thread
And will have more thread area in one inch than a coarse thread stud
As for a 4x4 or 8 lug. It is bigger in size than the coarse thread for that reason
The coarse thread will have a lower torque sheer rating and will not fit in the bigger metric stud holes.
Fine threads will have a 6-10% increase in efective stress area of thread on comparison to coarse thread
And will have more thread area in one inch than a coarse thread stud
Lead Driver
Joined: Jun 2007
Posts: 6,757
Likes: 5
From: Corvallis, OR
The reason for the metric thread studs are for tourque rating
As for a 4x4 or 8 lug. It is bigger in size than the coarse thread for that reason
The coarse thread will have a lower torque sheer rating and will not fit in the bigger metric stud holes.
Fine threads will have a 6-10% increase in efective stress area of thread on comparison to coarse thread
And will have more thread area in one inch than a coarse thread stud
As for a 4x4 or 8 lug. It is bigger in size than the coarse thread for that reason
The coarse thread will have a lower torque sheer rating and will not fit in the bigger metric stud holes.
Fine threads will have a 6-10% increase in efective stress area of thread on comparison to coarse thread
And will have more thread area in one inch than a coarse thread stud
Thread pitch for 4x4 or 8 lug, what?
Coarse threads won't fit the stud holes? Same holes for both the coarse and fine studs.
Not sure where you got that info from, but please don't spread it.
New User
Joined: Oct 2011
Posts: 7
Likes: 0
Ok maybe I'm just a stupid mechanic that has been working on medium to heavy duty vehicles and equipment for the past 15 years
Fine threat has a higher sheer rating than coarse Plain and simple
Yea I maybe a nubie to this forum but I know my s%#+
That's why I make gooood money working on heavy equipment here in California
I don't need a pissing match
that's why ford changed to fine thread on super duty
I wouldn't be caught dead using a coarse thread stud on my F550 13 mile to the gallon daily driver. Even with a higher tensile rating
Fine threat has a higher sheer rating than coarse Plain and simple
Yea I maybe a nubie to this forum but I know my s%#+
That's why I make gooood money working on heavy equipment here in California
I don't need a pissing match
that's why ford changed to fine thread on super duty
I wouldn't be caught dead using a coarse thread stud on my F550 13 mile to the gallon daily driver. Even with a higher tensile rating
Lead Driver
Joined: Jun 2007
Posts: 6,757
Likes: 5
From: Corvallis, OR
They're metric for the torque rating? No, there are higher grades in both metric and SAE.
Thread pitch for 4x4 or 8 lug, what?
Coarse threads won't fit the stud holes? Same holes for both the coarse and fine studs.
Not sure where you got that info from, but please don't spread it.
Thread pitch for 4x4 or 8 lug, what?
Coarse threads won't fit the stud holes? Same holes for both the coarse and fine studs.
Not sure where you got that info from, but please don't spread it.
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Joe Kucinski
Fleet Mechanic
Joined: Nov 2003
Posts: 1,372
Likes: 14
From: West Cornwall, CT
Ford changed to the fine thread studs for a reason.
Imagine you were an engineer that got told to "increase wheel clamping force, but we want to use existing hubs, wheels, etc." Also "we do not want to change any owner's manuals, so you can't change torque numbers'"
The only solution would be to go to finer threads because there is slightly more stud cross-sectional area under the thread's minor diameter. Also those fine threads will give a higher clamping force when torqued to the same value as the coarse threads (leverage).
My guess is that this is the best method that the poor engineer had when this hot potato got handed to him.
Lou Braun
Imagine you were an engineer that got told to "increase wheel clamping force, but we want to use existing hubs, wheels, etc." Also "we do not want to change any owner's manuals, so you can't change torque numbers'"
The only solution would be to go to finer threads because there is slightly more stud cross-sectional area under the thread's minor diameter. Also those fine threads will give a higher clamping force when torqued to the same value as the coarse threads (leverage).
My guess is that this is the best method that the poor engineer had when this hot potato got handed to him.
Lou Braun
Senior User
Joined: Sep 2010
Posts: 352
Likes: 0
Ford changed to the fine thread studs for a reason.
Imagine you were an engineer that got told to "increase wheel clamping force, but we want to use existing hubs, wheels, etc." Also "we do not want to change any owner's manuals, so you can't change torque numbers'"
The only solution would be to go to finer threads because there is slightly more stud cross-sectional area under the thread's minor diameter. Also those fine threads will give a higher clamping force when torqued to the same value as the coarse threads (leverage).
My guess is that this is the best method that the poor engineer had when this hot potato got handed to him.
Lou Braun
Imagine you were an engineer that got told to "increase wheel clamping force, but we want to use existing hubs, wheels, etc." Also "we do not want to change any owner's manuals, so you can't change torque numbers'"
The only solution would be to go to finer threads because there is slightly more stud cross-sectional area under the thread's minor diameter. Also those fine threads will give a higher clamping force when torqued to the same value as the coarse threads (leverage).
My guess is that this is the best method that the poor engineer had when this hot potato got handed to him.
Lou Braun
after an expensive court case involving a truck with 6 lugnuts missing from one wheel, a beaurocrat decides that you need more clamping force, but its too expensive to update the manuals, and 10 lug wheels are out of the question.
time for fine threads.
another benifit to fine threads is that your minor diameter is larger, so you get more "meat" to the fastener without changing anything else.
of course this isnt to say that coarse threads are weak.
after all, mine are still working just fine for me.
the bigger issue is the wheel bearings.
AFTERTHOUGHT:
maybe the change in thread was due to the change in wheel backspacing.
with a 0 or low offset wheel, there is very little torque on the wheels under static or straight moving conditions... of course when you are turning, things change.
with the higher offset wheels, you are CONSTANTLY applying a torque to the mounting flange, necessitating a change to higher clamping force studs.
i wonder if this has something to do with it?
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
The coarse and fine thread ones both show up for my 01 too. I got the wrong one by mistake (fine instead of coarse) and the hub fit just fine, so all I did was knock the fine ones out and install coarse ones. Cost me $32 IIRC, for the new coarse studs.
Trailering
Joined: Apr 2021
Posts: 20
Likes: 1
This is what I’m going through right now…return the hubs at a very high cost or change 16 studs for a bit cheaper than shipping back…
Cargo Master
Joined: Jan 2007
Posts: 2,243
Likes: 79
From: Roman Forest, TX
Hi Ricardo. And welcome to the forum. I just wanted to point out, in case you missed it, that you are replying to a thread that is 11 years old. Not really a problem, but just wanted you to know.
Mountain Pass
Joined: Jun 2022
Posts: 120
Likes: 12
From: South East
Kinda glad he did. lol
I always thought the Course threads were stronger as the thread would have more depth than a fine thread.
I can see clamping for being better with fine.
But strength I thought was with the course.
You learn something every day..
:-)