Hilicoil ate aluminum thread! Need help.

[Konstantin Bogach]

Fred,

I thought that the soft aluminum alloy is stipped fist, not a bolt.

Konstantin.

Fred Munro wrote:

> Hi Konstantin;
>
> The torque depends on the bolt class. The generic torque spec for a standard
> class 4T 6mm bolt is 5 Nm. Even a class 7T  6mm bolt only takes 10.5 Nm
> torque. A class 8T can take 29 Nm.
>
> It sounds like you may have overtorqued the bolt and stripped the helicoil.
> You may want to double-check your 25 Nm torque spec - I sold my beloved
> Bentley manuals for your model Audi to Geo, so I can't check it out for you.
> If it is 25 Nm, those are darn good 6mm Allen bolts!
>
> Fred Munro
> '94 S4