Definition
A metalworking hand file with a single set of parallel cutting ridges (teeth) running diagonally across its working face. Used to produce a smooth finish on metal and to sharpen edges, typically drawn across the work in one direction.
Plain English
A flat metal file with one set of straight rows of teeth cut at an angle across its surface. It removes metal slowly and leaves a smooth finish, so it is used for fine work rather than fast material removal.
Context Anchor
Seen in aircraft maintenance and shop work when smoothing, fitting, or finishing metal parts by hand.
Derivation
‘Single-cut’ refers to the one set of teeth, in contrast to a ‘double-cut’ file which has two sets crossing each other. Knowing this distinction makes the name self-explanatory: one direction of cut means one row pattern, which means a smoother result.
Why Pilots Care
Mechanics and pilot-owners use single-cut files when finishing repairs on metal aircraft parts. Choosing the wrong file (double-cut where single-cut is needed) can leave a rough surface that becomes a stress riser or fails inspection.
Intuition Check
Do not read “file” here as paperwork or a computer file. In this context, a file is a hand tool used to shape or smooth metal.
Example Sentence 1
The mechanic used a single-cut file to smooth the edge of the aluminum panel before riveting it in place.
Example Sentence 2
For final fitting of engine cowling panels, a single-cut file gave the needed control without gouging the surface.