... : support Unit of Ball Screw BK,BF,EF,EK,FF,FK Fixed side: BK10,BK12,BK15,BK17,BK20,BK25,BK30 Supported ... ,FF15,FF17,FF20,FF25,FF301. Support unit of ball screw-FK, specifications the same as THK . Used on both sides of ... screw with the standard of turning nut. 4. Nuts bearing-M 5. Lock solid nuts (RN), specifications and THK the same ... world! support units of ball screw/ball screw support unit FK&FF