Linear motion applications are often found to have not only radial loads but also axial load requirements. For these applications, single or double row angular contact bearings are often used. Single row bearings offer the advantage of a slimmer profile and double row bearings offer the advantage of longer life and higher radial, axial and moment loads capability.
Some companies choose to use single row ball bearings. However, this limits the number of balls inside and reduces the radial, axial and moment load supported by the bearing. Double row bearings have a thick outer ring which is often machined to match the raceway. For these reasons, PBC limits the use of single row bearings only to custom products where load is not the limiting factor, where a slimmer profile is critical, single row bearings are not used in any IVT products to provide greater load capacity.