Metallics JFM104 Screws 1/4-20 X 2 Fh Sl MS St-zn (Jar 100)
https://nsiindustries.com/product/1-4-20-x-2-in-flat-head-slotted-machine-screws-steel-zinc-100qty/
These flat head slotted screws have finer threads than typical screws, requiring a pre-drilled hole and are perfect for joining metal parts in machinery and construction.