•The complete units are consisted of a single-piece outer ring, a two-piece inner ring, balls, cage assemblies and seals.
•Bearings are double direction angular contact ball bearings with a 60' contact angle in an O arrangement.
•can support axial loads from both directions as well as radial loads.
•are preloaded after assembly by a precision locknut.
•are protected from contamination by lip seals or gap seals.
•are greased with a lithium complex soap base grease to SHELL Alvania RL3.
•can be relubricated.
•are suitable for operating temperatures from -30°C to +120°C (limited by the grease, sealing ring material and the plastic ball cages).
•are precision bearings e.g. for use with screw drives.
•outer ring is suitable for flange mounting.
•lip seals or gap seals on both sides.

More information:http://www.yi-tong.com/yi-tong/en/screw_bearing.htm