... bucket, mechanical loader, farming machinery and steering oil hydraulic cylinder.Bulldozer, Excavator and Cummins enginePiston Rod diameter: 30mmTube inside diameter: 60mm Stroke ... & polished piston rodSeries of oil cylinder:Bulldozer parts series: SHANTUI, KOMATSU, CAT, XCMC, ZOOMLION, HBXGExcavator parts series: KOMATSU, HITACHI, DAEWOO, HYUNDAI, KATO, KEBELCO ...