The Regal Beloit SealMaster large bore Performance Gold Line mounted ball bearing has an axial groove in the inner ring bore; the feature is available in medium 2 7/16-in. and up and standard 2 11/16-in. and up shaft sizes. The design provides clearance from the burr created by the setscrew used to lock the bearing to the shaft.
Regal Beloit Corporation; www.regalbeloit.com