... be used for slewing conveyers,welding arms and positioners,light,medium duty cranes,excavators and other engineering machines. Material:50Mn 42CrMo Module ... holes,inner ring with intallation screw holes4--Dia.of track center,mm5--Dia.of roller ball,mm6--Classification code No.of ... holes,inner ring with installation bolt holes,Dia.of track center 1250mm,Dia.of ball 40mmOEM supplier for Excavator for your ...