I give up! A 9/16ths nut is too tight for this bolt, and 5/8ths nut seems just a bit loose. Maybe I need a 19/32nds nut? And is this a UNC or machine style bolt? My shop book isn’t helping. The flat is one eighth of the pitch? I’m beginning to understand why they keep referring to the shaft!
Standard measurements (as they are euphemistically called) are anything but that. We have 20 grains to a scruple, 3 scruples to a drachm, and 8 drachms to an ounce. There’s 5280 feet per mile, 12 inches per foot, 16-1/2 feet to a rod, 43,560 square feet per acre, 7.48 gallons per cubic foot, and ... darn, I can never remember how many furlongs to a fortnight! There’s 12 drams to an ounce, 16 ounces to a pound, 14 pounds to a stone and two stones to a quarter.
A quarter is just a tad less than a slug (does anyone really care how accurate a slug is?). I can imagine a farmer trying to sell his truckload of 200 stones of melons, but how many buyers would there be for a 100 slugs of fruit?
A fathom is 6 feet, a braza is 5.48 feet, and a league is a hair over 3 miles. Oh wait, is that survey miles, nautical miles, or Irish miles?