... skip bucket, mechanical loader, farming machinery and steering oil hydraulic cylinder. Piston Rod diameter: 30mmTube inside ... polished piston rodSeries of oil cylinder:Bulldozer parts series: SHANTUI, KOMATSU, CAT, XCMC, ZOOMLION, HBXGExcavator parts series: KOMATSU, HITACHI, DAEWOO ... KATO, KEBELCO.Cummins Engine parts: N Series/K Series /M Series /H Series And all the products can be customized ...