On Monday, April 10, 2000 at 12:00:00 AM UTC-7, Hephaestus wrote:
> Careful here. The original bolt spec was in kg.mm-2, lots of folks simply
> read it as MPa, but the conversion isn't a straight 10, but 9.80665. Thus
> grade 10 isn't 1000 MPa, but 980.665MPa. Most times, this doesn't matter.
> if it does, it'll bite you.
> tim
> Daniel Kohl <danie...@gmx.de> wrote in article
> <38f2e1a7...@news.cs.tu-berlin.de>...
> > On Thu, 6 Apr 2000 20:49:52 -0500, "Dillagi" <i...@nowhere.com> wrote:
> >
> > >11.9/ 12.9 grades are basically metric grade materials. It would help if
> you
> > >see DIN standards. They were the originators of these specs. And it
> might be
> > >of interest to note that , first digit indicates the approx ultimate
> > >strength in n/mm2 (12.9 - has 120 n/mm2, if you multiply the first no.
> with
> > >second no. you will get the approx yield strength - 12x9- 108 n/mm2).
> Hope
> > >this will be of some help.
> > >Best of Luck.
> > >
> >
> > You are close to the right answer. But imagine the size of the bolts
> > that would be needed to hold something more powerful ;-).
> > Multiply all your results by 10 and you have the right values. Means:
> >
> > An 11.9 bolt is able to hold 1100 N/mm^2 (at least), while the
> > yielding strength is 11 * 9 * 10 = 990 N/mm^2.
> > This fabric is bend by 9 % by the time it breaks.
> >
> > Best Regards
> > Daniel Kohl
> >
> >
11.9 grade is found in ASTM F-2882/F-2882M.