... Factory 2. ABEC1, ABEC3, ABEC5 3. Z3,Z4 Deep Groove Ball Bearings, Deep Groove Ball Bearings) is the most common rolling bearing a type. ... Prototype deep groove ball bearing by a case and an inner ... R2-R24, R156, R166, R168, R188 Other non standard deep groove ball bearings, with inner size over 10mmSealZZ, Z, 2RS, RS, ...