@DavidJones A real Foot / Pounds or Furlongs / Fortnight rating would get my vote; in my mind, over torquing over stresses the bolt / threads even before a load is applied.Interestingly, I had an argument with stagehands under-tightening truss bolts, they were going basically finger tight, and could not figure out that an a uneven stage deck, the sections of truss might not meet completely flush, and extra tightening was needed to suck up the gap between them. I emailed one of the major manufacturers, I think Tyler or XFS and the response was "snug by mechanical means i.e. a wrench" I was really hoping for an answer is foot/pounds, but apparently anywhere past "pretty tight" does not affect the performance of the truss in any way. Even with loose bolts, the aluminum would likely fail before grade 8 hardware.
On Cheeseburoughs, I have had some giant ox strength hands strip out the threads. I usually don't go past 1/2 turn after finger tight for an overhang pipe or light tree. On fixtures they are always finger tight. No tools, unless we are doing something silly like yolking a mover out 90 degrees.
Ron has forgotten more that we mere mortals will ever know.
My understanding is that a firkin is a mass unit. Ie the mass of an imaginary ( thereby no mass) firkin filled with water. ( just as a gram was once defined as 1/1000 of a liter of water)