I've been keeping an assortment of grade 5 and 8 SAE hardware on hand in Plano boxes for years, mostly 8-32, 10-24, 1/4-20, 5/16, 3/8, 1/2. I just keep a general assortment in lengths that I feel like I can feasibly use, sometimes cutting down a longer bolt if necessary. I usually just buy SAE...