1. BK, BF, EK, EF, FK, FF 2. Used ... 4040371601108060100903713014182617.5.Ball screw end support bearingsBK AND BF TYPEORIGINAL: NINGBO CHINAHigh precision bearings BK10BK12BK15BK17 BK20BK25BK30BK35BK40BF10BF12BF15BF17 ... BKU10BKU12BKU15BKU17BKU20BKU25BFU10BFU12BFU15BFU17BFU20BFU25EKU6EKU8EKU10EKU12 EKU15EKU20SEKU20EKU25 EFU6EFU8EFU10EFU12 EFU15EFU20SEFU20EFU25 BK,BF Ball Screw Support