can I say u r overthinking this?
I don't over think when I buy them myself. I was just trying to provide info.
Buy studs, ask about installation. Install. Drink beer.
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I really feel like I should bow out of this since I'm out of my element so take it for the uneducated nothing that this is worth but based on what I know, all steels stretch and deform pretty much the same up to a very high point (around 60k PSI I think), it's only once you get close to yield that the harder stuff starts to deform less (esp when the others break obviously lol). So I really don't think at this torque level for an M12 fastener, 10.9 vs 12.9 will make any difference in terms of elastic deformation for backing out. But that's just my opinion and no one should listen to me.
As an aside, I installed the 82mm and with spacers (5mm front and 10mm spacer rear) they work fine, but lug nut install would be easier with the 92mm from B-World. The shorter 82mm are however more aerodynamic and lighter.
Feff
You're mostly right. The elastic modulus (Young's modulus) has much less variability in steels than the yield and tensile strengths. Even metallurgists will tell you that's a hard number to nail down.
A steel with a higher yield strength will enter plastic deformation at a higher stress than a one with a lower number (this plastic deformation will come with a hardening). A 12.9 will require 20% more stress (F/A) to break than a 10.9. FWIW, 12.9 means that the ultimate tensile strength (breaking point) is at least 1200MPa. Generally speaking, yield strengths are related to tensile proportionally.
Again, please note that I'm NOT saying that you would necessarily have a different spec, but due to alloys or microstructure required for the hardened fasteners that you MIGHT have a different spec, and should ask rather than assume.
I feel that I have a very strong metallurgical and mechanical background, but a 5 minute phone call on a new set of studs isn't much of an imposition.
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Good Day All:
For those of you removing and installing 12mm X 1.5 wheel studs, here's a couple of tools you many want to consider. They also come in other sizes.
Snap On Stud Remover: https://shop.snapon.com/product/MSK-M1215R
Snap On Stud Installer: https://shop.snapon.com/product/MSK-M1215N
I like the fact the stud installer gives you the option to torque in the studs to specs. Pretty easy to use per Snap On's web site video.
Hope this helps.
Feff
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