I'm upgrading some hinges on frameless MDF cabinets and need to source additional screws that will ideally match the existing threaded holes. The screws securing these hinges are unique to me, but must adhere to some sort of standard. They are a much larger diameter than the wood screws that ship with most cabinet hinges (~1/4" major diameter) and have the coarse thread of a wood screw but the flat tip of a machine screw. Interesting enough, they also appear to be pozidriv. That part may be useful for identification, but not critical for replacement.
I'm assuming that this is some kind of "confirmat" screw that's specifically designed to work in shallow particleboard, but I can't find equivalents. The local store doesn't stock anything, and a variety of online searches have been unsuccessful.
What naming standard do these screws adhere to, and where are they found?
I'd like to source replacements that would allow me to reuse the existing holes, and ideally find the same screw with a slightly longer shaft to secure replacement hinges with thicker mounting flanges. It's clear that these screws are extremely solid in MDF an I'd like to stick to this standard if possible.