truss rod
Noun
Meaning
English Wikipedia has an article on:truss rodWikipedia
truss rod (plural truss rods)
A steel rod that stabilises the neck of a guitar
Examples
Turning the truss rod clockwise tightens it, counteracting the tension of the strings and straightening the neck or creating a backward bow.
Turning the truss rod counter-clockwise loosens it, allowing string tension to act on the neck and creating a forward bow.
Some instruments have a filler strip running down the length and behind the neck, used for strength or to fill the cavity through which the truss rod was installed in the neck.
Some truss rod systems, called double action truss systems, tighten both ways, pushing the neck both forward and backward (standard truss rods can only release to a point beyond which the neck is no longer compressed and pulled backward).
The truss rod is a metal rod that runs along the inside of the neck.