Trunnion

A trunnion (from Old French trognon 'trunk') is a cylindrical protrusion used as a mounting or pivoting point. First associated with cannons, they are an important military development.

Alternatively, a trunnion is a shaft that positions and supports a tilting plate. This is a misnomer, as in reality it is a cradle for the true trunnion.

In mechanical engineering (see the trunnion bearing section below), it is one part of a rotating joint where a shaft (the trunnion) is inserted into (and turns inside) a full or partial cylinder.

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