Join Date: Feb 2017
Location: St. Louis, Missouri
The oem bolt was 93nm, and if using that I would use the 93 spec. If the bolt supplied by the crash bar manufacturer said 75 nm with their bolt, I'd use that--but I suspect its not the same hardness as the oem bolt. Probably longer to compensate for the crash bar mount thickness as well.
Here is what you can do and have it all: Go to a Fastenal store or Fastenal.com. Get your new bolt from the crash bar maker and measure it for length in a grade 8.8 or 9.8 harder metric bolt in the same length and thread pitch as what the new bolt is.
This thru-bolt, as in the SV650 in my garage, is a 12mm X 1.25 thread pitch bolt. So you need a harder 12mm X 1.25 thread pitch bolt in the same length as supplied by the crash bar company.