SBF-centripetal needle and holding rack component are separate rolling component. Not only can it precisely direct needle but also keep the proper position. Such bearings are suitable for use where axis and base hole can be used as rolling way. As long as axis and bearing base rolling way are processed according to the regulated size precision and geometry precision igh rotating precision of the smallest space can be assured. Main structure forms: K centripetal needle and holding rack component K---D divided centripetral needle and holding rack component K---ZW two-row centripetal needle and holding rack component K---DZW divided two-row centripetal needle and holding rack component