Non Stainless nuts
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Lead Driver
Joined: May 2003
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From: Lyndonville, Vermont
Non Stainless nuts
The part number W701706-S2 is supposed to be stainless nuts for the exhaust system per the TSB. They are not stainless Does anyone know why?
I'm wondering if ford screwed up. The studs are stainless and the TSB say's plainly stainless nuts...
Dick
I'm wondering if ford screwed up. The studs are stainless and the TSB say's plainly stainless nuts...
Dick
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Lead Driver
Joined: May 2003
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From: Lyndonville, Vermont
Come on guys. They are not stainless in any way. I'm a cert welder and mech eng...
And good stainless forks etc are non mag. Cheapies are Slightly.
I figured they coated the studs with copper to prevent galling. I'll prob call ford cause the TSB is wrong or the parts are bagged wrong..
Dick
And good stainless forks etc are non mag. Cheapies are Slightly.
I figured they coated the studs with copper to prevent galling. I'll prob call ford cause the TSB is wrong or the parts are bagged wrong..
Dick
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Originally Posted by 2002 F350V10
Low grades of stainless will also rust.
It might be they WANT two different types of stainless next to each other. Either that, or they (Ford, not the parts dept.) just screwed up...
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Lead Driver
Joined: May 2003
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From: Lyndonville, Vermont
The light stainless has a small amount of magnetism. These nuts are steel. The part number is per the tsb. If anyone has any connection with ford it would be nice to find out whats going on. I don't want to put them on if they are the wrong one's.
Dick
Dick
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From: USA
99,Heres my take ,this coming from my manufactoring background where we worked with high temp furnaces.using alot of SS bolts nuts and inconel parts.
It was always found when using ss bolts /nuts in combination around very high temps and torquing the bolts and nuts.They would gall and become a pita to get apart.
We switched to a special nuts a different grade of stainless ,problem solved.
Rich
ps I don't know wht Ford uses ,chk at the parts dept to see if another kit has the same nuts as you have.
On my new truck the studs are ss ,but the nuts look to be of a different type.
It was always found when using ss bolts /nuts in combination around very high temps and torquing the bolts and nuts.They would gall and become a pita to get apart.
We switched to a special nuts a different grade of stainless ,problem solved.
Rich
ps I don't know wht Ford uses ,chk at the parts dept to see if another kit has the same nuts as you have.
On my new truck the studs are ss ,but the nuts look to be of a different type.
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f350sd - I think you are right. I bought the studs and nuts listed in the TSB a couple of weeks ago, and noticed the nuts seemed way too magnetic to be stainless (maybe 400 series, but not decent stainless). Agree - the new studs are stainless/copper flashed.
I'm changing the studs on my '04 5.4l like a previous poster suggested - one at a time before they rust away/break. So I bought some 18-8 stainless nuts and 18-8 split ring locks (the Ford nuts are self-locking), I am hoping this will hold up.
I hope someone can explain why the TSB says the nuts are stainless.
I'm changing the studs on my '04 5.4l like a previous poster suggested - one at a time before they rust away/break. So I bought some 18-8 stainless nuts and 18-8 split ring locks (the Ford nuts are self-locking), I am hoping this will hold up.
I hope someone can explain why the TSB says the nuts are stainless.
Cargo Master
Joined: Apr 2003
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From: Too close to Houston
400 series stainless is magnetic. I wouldn't say "low grade" stainless is magnetic because every one of my stainless firearms are magnetic and that stuff is anything but low grade. Bottom line is, a magnet is not much help in determining if an alloy is not stainless.
A stainless alloy is chosen for it's particular properties. That might be strength, machinability, or resistance to certain chemical or physical attack.
My guess (and it's just a guess) is that Ford chose two different alloys to reduce the chance of thread galling as mentioned before. A non-stainless nut on a stainless stud would set up a galvanic cell that would quickly destroy the nut. I would never put a stainless nut on a stainless stud without a generous application of high-nickel thread lubricant even if the different alloys are not supposed to gall.
A stainless alloy is chosen for it's particular properties. That might be strength, machinability, or resistance to certain chemical or physical attack.
My guess (and it's just a guess) is that Ford chose two different alloys to reduce the chance of thread galling as mentioned before. A non-stainless nut on a stainless stud would set up a galvanic cell that would quickly destroy the nut. I would never put a stainless nut on a stainless stud without a generous application of high-nickel thread lubricant even if the different alloys are not supposed to gall.