Definition
A self-tapping sheet metal screw with a hardened thread that cuts its own mating thread as it is driven into a pre-drilled hole in thin metal. Originally a trade name of the Parker-Kalon Corporation, the term is now used generically in aviation maintenance for self-tapping screws of this type, commonly used to attach lightweight nameplates, data plates, and non-structural fittings to aircraft sheet metal.
Plain English
A small metal screw that cuts its own threads as you drive it into a drilled hole, so you don't need to tap the hole first. Often used to attach name plates and small fittings to aircraft skin.
Context Anchor
Seen during aircraft maintenance when attaching light panels, covers, fairings, or other thin sheet-metal parts.
Derivation
Named after the Parker-Kalon Corporation, an American manufacturer that popularized self-tapping screws in the early 20th century. Like "Crescent wrench" or "Phillips screw," the brand name became the common name for the type.
Why Pilots Care
Pilots rarely install these directly, but knowing the term helps when reading maintenance manuals or discussing repairs with a mechanic — particularly when small placards, data plates, or interior trim need to be removed and reinstalled.
Intuition Check
Do not assume a Parker-Kalon screw is just any aircraft screw. Here it means a self-tapping sheet-metal screw for approved light-duty fastening.
Example Sentence 1
The mechanic used Parker-Kalon screws to reattach the data plate after the inspection.
Example Sentence 2
Parker-Kalon screws let the technician install the inspection cover quickly without drilling threads.