Within the family of Simplicity® linear bearings, precision and compensated are terms that refer to the two classes of available running clearances. It is important to understand the difference in these two classes for the design and installation process to ensure that bearing systems will perform properly.
If you are building a linear slide system or replacing existing bearings, a simple way to check for the difference between a precision and a compensated bearing is to place each on a shaft. In this side-by-side comparison, you will distinctly feel more play caused by the greater clearance in the compensated bearing. Note that many parallel shaft applications will run with an “FL” (Precision) bearing on one rail and “FLC” (Compensated) bearing on the opposite rail to accommodate for slight misalignments. Below is a quick reference comparison for Simplicity® bearings: