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Check theSEAINT web site for archive.  This was covered just a few days
ago.

On Thu, 11 Mar 1999, Alberto Guida wrote:

> 
> 
> I am using a british program for steel design. I donīt know what   grade 3.6, 4.6, 4.8, ..., means.
> These grades are used for bolts.
> Somebody knows what this means?
>  
> Thank you very much
>  
> Alberto Guida
>