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Re: bolt rating
Ryon,
A 10.9 head marking on a metric bolt has a minimum yield strength of
135ksi.
Albert
- ----------
>
> From: warrer@domain.elided (Ryon C Warren)
> Date: Thu, 26 Sep 1996 09:03:26 -0400
> Subject: Re: Head bolts
>
> On Thu, 26 Sep, btoski@domain.elided (Bruce Toski) writes-
>
> ...Shop suggests replacement to all customers with old bolts still in
> head. Pull valve cover and replace ONE AT A TIME...
>
> My question, what is the strength rating (i.e. the number stamped on
> the head) of the recommended replacement head bolts. I believe
> the head bolts on my '81 528i are stamped 10.8, which if memory
> serves correctly is 10,800 psi tensile strength. All this talk of
> head bolt failure has me slightly paranoid, and wonder if I should
> change to higher strength bolts.
>
> Anyone...?
>
> Ryon
> '81 528i
> '95 VW Golf