PT 2.5 / WN1412 2.5 self-tapping screws

thread-forming (plastic)

6 documented uses, taken from manufacturer catalogs, service manuals and teardowns.

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Pilot hole should be ~2.0-2.1mm for typical engineering plastics
Self-tapping into M-thread inserts is a common mistake; ensure boss is bare plastic
Phone, console, router, drone and vacuum teardowns almost always publish only driver type and length, not the thread-forming size. Fastener makers (EJOT Delta PT, Plastite/WN1412, Covestro plastics guides) publish sizes 1.6-10 mm with pilot-hole tables instead, so size the screw from the boss hole, not from a parts listing.