Quote:
Originally Posted by KSpeed Auto
Metric hardware does not come in "grade 8" - that is a US grade. "8.8" is for regular applications. "10.9" is a higher grade and typical of engine and brake stuff (and roughly equivalent to US grade 8 ). "12.9" is even higher and is hard to find in anything but socket-head cap screw. Low grades like "5.8" are for very mundane stuff. The tensile and yield strength are proportional to the numbers, which actually mean something. With a 10.9 screw for instance, the "10" stands for a tensile strength of 10x 100MPa = 1,000 MPa, and the ".9" stands for a yield strength that is 0.9x the tensile strength or 900MPa.
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I knew that metric hardware doesn't come in "Grade 8" but I couldn't remember the equivelent. Thanks for the explaino.
