Abstract: A bearing lock is provided which can be inserted, tightened, and removed from the exterior of a rotating machine without disassembly of the end bell of the machine. Positive guiding means insure that the locking portion will only engage a bearing outer race. A portion of the bearing lock comprises a lever which turns about a housing portion fulcrum as a tightening means is torqued. As the locking member is displaced, an angular extension of the lock is drawn into engagement with the outer race and transmits an axially directed force thereon. When secured in operating position, the body of the lock has minimal axial projection thereby avoiding interference with adjacent structure.