... ring Basic data (Q Series): The single-row four points contact ball Slewing Bearing is composed of ... Gear(max) 12-201--Type of slewing ring Single-row ball Q Series2-- Code of driven typeW.Outer teeth ... ,A.normal7--precision gradeHigh precision,without G.normal Single-row ball,bigger module,outer gear,Outer ring with installation ... 3R225-7R215-7 Excavator slew bearing for Single-row ball slewing ring