... ,ABEC-5 P0/ P6 /P5/P43.Fields Used in : Motorcycle , Motor , Pump ,Fan,Air conditioner ,Microwave Oven,Rangehood,Sewing machine,Massage ... necks especially application to rolling machineswhich rolling at a high speed.FC:Double outer rings,single inner ring,without ribs.FCD ... impact load.2.Small frictional factor.Suitable for high-speed.Its limiting speed is nearly the same as deep groove ball bearings3 ...