... ,NTN,NSK Application:crankshaft,swing and travel motor,swing shaf bearing steel Chemical ingredients: Steel No. Sepc. Chemical IngredientsGcr15AISI 52100 C ... .638690082009016030152178NF2182.343005000551002597114NU2211E0.96856006600roller bearingMeterial:bearing steel GCR15Brand:SQT,NTN,NSKApplication:crankshaft,swing and travel motor,swing shaf kota cylindrical roller bearing for excavator