Detailed article - https://tinyurl.com/5fr6f2de
Self-tapping screws for plastic, as the name implies, form or tap its threads when screwed into the plastic material with either pre-drilled or moulded pilot holes. These provide an economical method of joining two plastics or plastic to metal and allow easy disassembly and reassembly.
Content source and credits:
trfastenings.com
engineeringproductdesign.com
celofasteners.com
