Definition
A solid rivet whose manufactured head is flat on top with a tapered underside, designed to sit flush or near-flush against the surface of the material it fastens. Used in aircraft structures where a smooth external surface is needed to reduce drag or where clearance for adjacent parts is limited.
Plain English
A small metal fastener with a flat top that sits almost level with the surface of the metal sheet it holds together, instead of sticking up above it.
Context Anchor
Seen in aircraft maintenance, sheet-metal repair, and parts drawings that specify the type of rivet head to use.
Derivation
Flathead' simply describes the shape of the rivet's manufactured head — flat on top — distinguishing it from rounded styles like roundhead or brazier head rivets.
Why Pilots Care
On exterior surfaces, rivet head shape affects airflow and drag. Knowing the difference between flathead, roundhead, and countersunk rivets helps a pilot or owner understand a maintenance log entry or a repair on their aircraft.
Intuition Check
Flathead does not mean the rivet is automatically flush with the aircraft surface. It means the head itself has a flat top; whether it sits flush depends on the rivet design and how the hole is prepared.
Example Sentence 1
The mechanic chose flathead rivets for the interior bracket where a smooth profile mattered but a fully flush finish was not required.
Example Sentence 2
After removing the old rivets, the mechanic replaced them with new flathead rivets to restore the smooth surface.