PT 2.2 / WN1412 2.2 self-tapping screws

Watch out for

• Hole diameter critical: typically 1.8-1.9mm for ABS/PC blends
• High risk of boss splitting if wall thickness < 1.0mm
• 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.