Screw drive bearing-BS series:BS series(Non-ISO metric).Ball screw bearing is single direction angular contact ball bearing with 60 degree.The bearing can bear axial load in single direction and certain radical load. the bearings is mainly installed on ball screw of machine tool feed systems,two to four row arrangements are used in common ways.The back-to-back duplex arrangement is commonly used because it allows acquisition of the specified preload by tightening the inner ring. The face-to-face duplex arrangement may be used if more precise alignment is required.Or universal ground set combination bearings are also available(Suffix G) .,this permits the use of random combinations where two or more bearings are mounted. ball screw support bearings are generally lubricated with grease especially the double seals one packed with grease before sending. | 
