Definition
A type of mechanical fit in which a part is slightly larger than the hole it goes into, requiring it to be forced (driven) into place with a hammer, press, or similar tool. Once installed, the part is held in position by friction alone, with no fasteners required.
Plain English
A fit so tight that the part has to be hammered or pressed into the hole, and once it's in, it stays put on its own.
Context Anchor
Seen in aircraft maintenance when installing items such as bushings, bearings, sleeves, or pins into a hole or housing.
Derivation
From 'drive' meaning to force something into place by striking it. The name describes exactly what the mechanic does: the part has to be driven in.
Why Pilots Care
Creates a secure connection that resists loosening from engine vibration and flight loads without relying on bolts or clips.
Analogy
It is like a wooden peg that is just a little larger than the hole. You cannot drop it in; you have to tap it in, and the tight contact holds it there.
Intuition Check
Do not read “drive” here as engine power or motion. In this term, “drive” means forcing a part into a tight opening during installation.
Example Sentence 1
The bushing is a drive fit in the bracket, so the mechanic used an arbor press to seat it.
Example Sentence 2
A drive fit was used to seat the pin in the landing gear linkage so it remained tight under repeated loads.