I highly recommend you using the AFFDL-TR-69-42 lug method. I believe that the grumman manual also assessed lugs with this methodology.
I know the OEM's put strict limits on ratio ranges- more restrictive than bruhn. Many times the test lab will do a few points and say use xx curve valid for...
I wish I could fill in details...
I begged the guy for a defective nut. Vendor fedex him new hardware and he sent it all back. So, just speculation unless the manufacture admits to the problem.
If I do happen to get a nut- I'll take a close up pic at work with inspection equipment and get a...
I grabbed this off an hot-rod website.
It was holding a cylinder head on .. running high boost. Failure mode looks strange to me for a nut. I expect shearout of either nut or stud threads.
Reading around my only viable scenerious are ..
1) just wasn't heattreated and residual forming...
I would use an epoxy. An unfilled on will not be thicksotropic (sp?). Epoxies get good strength even with some gaping. You can put a micro-sphere filler in the resin.
Not that I would use this system- but google on "west epoxy system". They have many examples on how their system has been...
I think my advisor at the University worked with someone on a MS thesis on the topic. From memory.
First, lug bolts are way over designed for the loads- due to shop, abuse, liability.
2) I think OE's official stance is lug bolts/nuts are to be replaced not reused- then the coating is intact...