Spherical roller bearings must be used in pairs?
Depending on how the machine works.. A cylindrical roller roller bearings or cylindrical roller with an angular contact ball are possible, so that many collocation on the mill.
A cylindrical axial displacement can be but can not bear the axial force, roller can bear axial force and radial force but not axial displacement, axial load of single row angular contact bearings can bear radial load and single direction.
Double row angular contact ball bearing is similar to two back-to-back mounted single row angular contact ball bearings in the design, can bear radial and axial load in two directions, four point contact ball bearings can withstand axial load in two directions, but a very small part of the four point angular contact bearing can bear radial force is axial force. These are only preliminary reference, it is best to check the mechanical work conditions.
