... stock,quick delivery 3.ISO9001 Linear motion slide rail support unit FK seriesSupport unit of ballscrew EF,EK ... BF,FK,FF...As a professional ball screw support units manufacturer with many year’s experiences, ... same time ,we imported many TaiWan ball screw support units in stock .They are high quality ... with reasonable price.This BF type ball screw support bearings are manufactured with poly amide so that ...