• #### 11.9 Bolt Grade

From Quentin Smith@21:1/5 to Hephaestus on Tue Apr 20 15:32:04 2021
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.

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