What is the purpose of thrust bearings?

• A. To prevent axial motion
• B. To support radial loads only
• C. To generate lubrication
• D. To convert radial to axial motion

Answer: (A)

Thrust bearings are designed to carry forces that act along the shaft’s axis, known as axial loads. Their main job is to prevent the shaft from moving in that direction, keeping it properly positioned and aligned under thrust. This is different from radial bearings, which handle loads perpendicular to the shaft. So the purpose is to resist axial movement and support the shaft against thrust forces. Lubrication comes from the bearing’s lubrication system, not from the bearing itself creating lubrication, and thrust bearings don’t convert radial motion into axial motion.