The Lowe's screws are undoubtably made in
China qand are usually junk.
Try a company like Fastenall for good screws.


Even buying from Fastenal is no guarantee of
quality. Lots of their stuff is from
interesting sources. I especially see it in
small (#6) setscrews. They spin the socket out
very easily. For that application I buy
HoloChrome from MSC. #6, #8 and #10? Fastenal
stuff is OK. If you are trying to screw them
into an unthreaded hole in aluminum, it isn't
going to matter if they are hand made by elves
from unobtainium barstock and lubed
with yak butter---the little buggers are going
to break.