Definition
A type of hand-operated metal-cutting shear in which the upper jaw is supported by a frame that does not extend back behind the cutting blades, allowing sheet metal to pass freely around the cutting head. This makes it possible to cut curves, irregular shapes, and pieces of unlimited length or width because the workpiece is not restricted by a throat or frame depth.
Plain English
A pair of bench-mounted metal cutters with no frame blocking the back of the blades, so a sheet of metal can be turned and curved around the cutter while you cut. You can cut a circle out of the middle of a large sheet without the frame getting in the way.
Context Anchor
Seen in aircraft maintenance and sheet-metal repair work, especially when cutting aluminum pieces for patches, panels, or formed parts.
Derivation
Named for what they lack: the 'throat' on conventional shears is the open space between the blade and the frame behind it, which limits how far in from an edge you can cut. 'Throatless' means that limit is gone — the metal can pass anywhere around the blade.
Why Pilots Care
Pilots performing or supervising sheet metal repairs on their own aircraft (especially owner-maintained or experimental aircraft) will encounter throatless shears when cutting patches, doublers, or curved skin sections to fit irregular repair areas.
Analogy
Think of regular scissors as having a handle area that quickly gets in the way of a large sheet. Throatless shears are more like a cutter with an open path behind the blades, so the sheet can keep moving as the cut continues.
Intuition Check
"Throatless" does not mean the tool is missing a blade or cutting part. It means there is no closed back opening behind the blades to limit the movement of the sheet metal.
Example Sentence 1
The mechanic used the throatless shears to cut a curved aluminum patch for the wing skin repair.
Example Sentence 2
Throatless shears let the technician trim the fuselage skin without stopping to reposition the sheet.