... Single-Row Crossed Roller Slewing Ring is composed of two seat-rings, compact structure,light weight,small assembly-clearance,high ... Slewing Ring( 13 series) Three-Row Roller Slewing Ring has 3 seat-rings,Upper Orbit,Nether Orbit and Radial Orbit are separated ... Single-Row Crossed Roller Slewing Ring is composed of two seat-rings, compact structure,light weight,small assembly-clearance,high ...