[Vwdiesel] Torque to Yield
Patrick Dolan
pmdolan at sasktel.net
Tue Mar 1 05:51:23 PST 2011
The mere fact that a TTY bolt CAN be used into a range of strain that puts
it into plastic deformation without brittle tensile failure should be
telling us that they are not particularly high strength fasteners. I
would be comfortable replacing them with 8.8 for shear bolts and 10.9 if
loaded in tension- coarse pitch for most, fine pitch if clamping a surface to immobilize a joint is the service condition. Then, just torque to spec for the fastener size, grade, pitch and thread condition (i.e. wet or dry).
----- Original Message -----
From: Shalyn Shourds <sshourds at flash.net>
Date: Tuesday, March 1, 2011 1:00 am
Subject: [Vwdiesel] Torque to Yield
> I'm making some good progress on my '00 Jetta front end project,
> but it
> seems like every bolt I pull out of it is a TTY bolt. I'm
> probably
> going to be out nearly $100 replacing just those. Knowing that
> cars
> stayed together before those were implemented, is there a
> guideline for
> substituting in non-stretch bolts? I recently did the front end
> of my
> '85 and I only had to replace a few lock nuts. The system as it
> is has
> lasted 280,000 miles so I don't know if I'll ever have to go back
> in
> there again, but I guess I'm wondering just for engineering
> knowledge's
> sake. I do have access to a reasonably large store whose only
> product
> is metric hardware, so there's a good chance that I could find
> equivalents.
>
> -Shalyn
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