Proper bearing installation is essential to safeguard maximum bearing life. Maintenance experts estimate that 27% of bearing failures can be attributed to improper installation and mounting errors. A bearing that is only a few thousandths of an inch out of alignment can have its lifespan cut in half. By heating the inner race to ~250°F prior to installation, the user allows the bearing to expand and slide easily onto the shaft. Cones style heaters are an economical option for those that only occasionally need to install a bearing. BESSEY. Simply better.