Definition
A mechanical fastener that uses helical threads to hold parts together, such as a bolt, screw, stud, or nut. The threads convert rotational force into clamping force, allowing the fastener to be tightened to a specific load and later removed without damaging the parts it joins.
Plain English
Any fastener with spiral grooves cut into it, like a bolt or screw, that you turn to tighten and can unscrew later.
Context Anchor
Seen in aircraft maintenance when bolts, screws, nuts, and similar hardware are installed, inspected, tightened, or replaced.
Derivation
From 'thread' (the helical ridge cut into the fastener) and 'fasten' (to hold firmly together). The thread is what distinguishes this family of fasteners from rivets, pins, or clips.
Why Pilots Care
Loose or failed threaded fasteners can lead to vibration-induced damage, loss of control authority, or structural failure in flight.
Intuition Check
Do not think of “threaded” as cloth or string here. In aircraft hardware, “threaded” means the part has spiral ridges that screw into matching ridges.
Example Sentence 1
The technician inspected each threaded fastener on the inspection panel for corrosion before reinstalling it.
Example Sentence 2
During the 100-hour inspection, the mechanic checked all accessible threaded fasteners for proper security and safety wire.