... Bearing for all types of excavators Single-row ball slewing ring Basic data (Q Series): The single-row four points contact ball Slewing ... Module of Gear(max) 12-201--Type of slewing ring Single-row ball Q Series2-- Code of driven typeW.Outer teeth, ... module,without ,A.normal7--precision gradeHigh precision,without G.normal Single-row ball,bigger module,outer gear,Outer ring with installation screw ...