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Discussion Starter #1 (Edited)
Rear Sub-Frame Bolts - In Stainless Steel - Extras for sale

I did not enjoy removing the one rear sub-frame bolt I needed to.

So screw this rusty crap, I'm having Stainless Steel bolts made.
M12 x 1.75 x 130mm , Ø20mm flange, 14mm wrench (across the flats)
Hot forged head, rolled threads, chemically ected.
And yes I'll have to order 100~500 bolts.

They will have a certified minimum 180 ksi tensile strength.
Grade 8 (Standard threads) and Grade 10.9 (Metric threads) are 150 ksi minimum.
http://www.americanfastener.com/technical/grade_markings_steel.asp

What's left of my threads looks like about 2.75 in long.
My only question is ...
How long are the threads on the Ford part (N805747-S100)?

Any help would be appreciated.
Thanks.
 

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Discussion Starter #3 (Edited)
All distributors I checked did not carry anything above an A2-70 or A4-70 bolt.
Most also did not have a bolt over 120 mm.

That being said, I just sent an email to your link to see what they have.

Thanks,
 

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Discussion Starter #5
Ro-Brand also did not have the correct strength bolts.


Anyway
Since I'll have extra, anyone want to buy some?
 

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too soft

Hello

Stainless is too soft.

I had one brake. Rear K rear bolt that is. Do to contact.

I had to drill the trunk and remove the nut.

Paul
 

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Discussion Starter #7 (Edited)
The common stainless steel bolts grades are too soft.
Common metric grades are ...
304 like material is used to make A2 grade bolts
and
316 like material is used to make A4 grade bolts.

But it's not that simple.
It turns out that you can heat treat stainless to different class. So a A4-80 is stronger than a A4-70 bolt.
We could use an A4-100 bolt , if we could find one.
Since I could NOT find one in our size, I've having them made.

The bolts I'm having made are not 304 or 316 which are 18-8, but closer to 17-4.
17-4 is a semi austenitic precipitation hardening grade of stainless.

What's important is the tensile , yield and shear strength will be higher than the 10.9 epoxy coated steel bolts we are currently using.

Reference material
http://euler9.tripod.com/bolt-database/22.html
http://www.anzor.co.nz/?t=40
http://www.nucor-fastener.com/pdf/TDS_013_Shear Strength.pdf
http://www.bufab-stainless.se/eng/index.htm
http://www.roymech.co.uk/Useful_Tables/Screws/Strength.htm
 

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Discussion Starter #9
Fastenal was one of the first places I checked.
 

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Discussion Starter #10
Ordered a bolt

Since no one offered up the measurement of the thread length, I ordered a bolt from the Ford Parts Counter here.
Damn I like those guys. It's nice to talk to people who know their stuff.

As for the SS Bolt, the hot forging dies need to be made and then the bolts MUST be tested and certified. So 10 weeks after I place the order, bolts should be available.
 
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