Certified Maintenance and Reliability Technician (CMRT) Practice Test 2026 - Free CMRT Practice Questions and Study Guide

A blue-colored bearing is often indicative of overheating. This coloration is a result of the high temperatures that occur when there is excessive friction or inadequate lubrication within the bearing. When a bearing overheats, it can reach temperatures that cause the metal to oxidize, leading to the blue coloration. This change in color signifies that the materials have been subjected to thermal stress, which can compromise the bearing's structural integrity and lead to premature failure if not addressed.

While other conditions may lead to different visual cues, such as contamination or wear patterns, the blue tint specifically correlates with overheating phenomena. Proper installation and maintenance practices can help prevent overheating, ensuring optimal performance and longevity of bearings in machinery.