trunnion

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trunnion

[′trən·yən]
(design engineering)
Either of two opposite pivots, journals, or gudgeons, usually cylindrical and horizontal, projecting one from each side of a piece of ordnance, the cylinder of an oscillating engine, a molding flask, or a converter, and supported by bearings to provide a means of swiveling or turning.
A pin or pivot usually mounted on bearings for rotating or tilting something.
(engineering)
A tubular section of steel welded to the side of a pipe in order to help support the pipe.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.