... 12-201--Type of slewing ring Single-row ball Q Series2-- Code of driven typeW.Outer teeth,N.Inner teeth,U.No ... with installation screw holes,inner ring with intallation bolt holesD.Outer ring with intallation bolt holes,inner ring with intallation ... .normal7--precision gradeHigh precision,without G.normal Single-row ball,bigger module,outer gear,Outer ring with installation screw holes,inner ring ...