... 3,Material:40Mn2 4,Warranty:6 months Excavator undercarriage part,track chain E320 1,Product's Information BrandXJMaterial40Mn2TechnologyForging/CastingHardnessHRC 52-56 ... roller assembly, sprocket, idler, link assembly, track shoe, high strength bolt and nut, bucket pin and bushing etc.Production Line:3,Packing ... R210 R290 R220 R320 YC35YC85 SWE65 SWE70 Excavator undercarriage part,track chain E320