Definition
A headless threaded fastener, typically threaded on both ends, that is permanently installed into a parent part (such as an engine case or cylinder) so that another component can be secured over it with a nut. One end is threaded into the base material; the other end accepts the nut that holds the attached part in place.
Plain English
A metal pin with threads on both ends. One end screws permanently into a part, and a nut goes onto the other end to hold something against it.
Context Anchor
Seen in aircraft maintenance, especially around wheels, engines, exhaust systems, and places where parts are bolted onto a fixed surface.
Derivation
From Old English 'studu', meaning a post or upright support. The fastener is named for the way it stands up out of the parent material like a small post, ready to receive a nut.
Why Pilots Care
Loose or failed studs can allow engine components such as cylinders to loosen, leading to loss of compression or catastrophic engine failure.
Analogy
A stud is similar to a bolt with no head that is already fixed in place. Instead of turning the whole bolt, you slide the part over the stud and tighten a nut onto it.
Intuition Check
Do not read stud here as a decorative button, an animal, or a wall-framing piece. In aircraft maintenance, a stud is a fixed threaded metal fastener used to hold parts together.
Example Sentence 1
The mechanic torqued each cylinder hold-down nut onto its stud in the proper sequence.
Example Sentence 2
A cracked stud was discovered during the preflight inspection of the engine mount bolts.