Jeff, if you can't find a manufacturer's torque figure for a particular application, just google 'torque specs' and look for the diameter of the bolt/screw, the tpi (threads per inch) and the bolt/screw material.
If metric, it's similar ....bolt/screw diameter, then pitch in mm, and material.
Here's an easy one to follow...
https://www.fastenal.com/content/mer...ce%20Guide.pdf
Cheers,
Glen