[Prev][Next][Index][Thread]

Re: bolt rating

Ryon,
A 10.9 head marking on a metric bolt has a minimum yield strength of
135ksi.
Albert

- ----------
> 
> From: [email protected] (Ryon C Warren)
> Date: Thu, 26 Sep 1996 09:03:26 -0400
> Subject: Re: Head bolts
> 
> On Thu, 26 Sep, [email protected] (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