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ABMA STD 15 1991 Edition, January 1, 1991
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Ball Bearings With Spherical Outside Surfaces And Extended Inner Ring Width (Includes Eccentric Locking Collars)
Includes all amendments and changes through Stabilization Notice (No longer revised / updated) , 2010
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This Standard specifies boundary dimensions and tolerances for bearings with spherical outside surfaces and extended inner ring width and eccentric locking collars. These bearings are frequently mounted in housings having mating internal spherical surfaces to provide alignment at mounting.

Relubrication features are optional and may be designed to interface with the lubrication zones of mating housings so that the bearings will be properly lubricated. The relubrication means in the outer ring, if used, shall be located on one or both sides of the outer ring zones, defined by dimensions in the tables, in such a way that lubricant will satisfactorily feed into the bearing from a housing bore groove covering the zone.