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Hi Kit!
In reading your statement “ Stating drive shaft securing hardware torque values is a legal liability?”
I thought to “myself” that I haven’t thought of the nuts and bolts systems having a specific liability?
I have trouble believing and in thought, that there is any Real liability, that can be pinned to any one manufacturer. There are only the standards set by engineering societies.
The standards give specifications for grading quality for fastener component strength within the range of manufacturing production tolerances and that’s it!
You will notice that the automotive sector does not use your local standard cadmium or galvanized coated hardware.
If you put in a No. 2 grade bolt in a No. 5 grade application, then that’s own you!
This is a part of grading, let alone other design considerations like for head bolts that can be put into various materials. This alone can dictate the use finer threads or coarse threads with class of fit restrictions.
We as consumers and “in-training” mechanics, world wide, must be aware guidelines in manufacturers manuals.
I guess this is where technical writing comes in for you!
Since this application is done with a “Nut & Bolt assembly” things are settled down a bit!
The application of the mating nut helps a bunch!
I located this site that has tables for bolts but does not account for materials the bolt is put into, but is judged by average applications that tensions the assembly.
I found this set of charts that can be used in lieu of specific applications involving materials and torque sequences!
https://applifast.com/wp-content/uploads/2017/07/Applifast_Conversion_Table-Torque.pdf
It seems to span a spectrum of information needed to set torque wrenches conversion too!
Hope this helps, but I bet by now, the driveshaft is spinning along!
Phil
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