Understanding the Importance of Cutless Bearings in Shafting Systems

Cutless bearings are a vital yet often overlooked component in marine shafting systems. Installed in the stern tube or strut, these water-lubricated bearings support the propeller shaft while allowing smooth rotation under heavy loads.

Their design relies on a durable rubber lining with grooves that channel seawater around the shaft. This natural lubrication cools the bearing and reduces friction, ensuring long service life and minimal wear. When in good condition, cutless bearings keep the shaft centered, minimize vibration, and prevent metal-to-metal contact that could damage the shaft or housing.

However, when neglected, worn or damaged bearings can cause severe problems. Symptoms include shaft noise, excessive vibration, and leakage. Left unresolved, this can lead to shaft misalignment, higher fuel consumption, and in worst cases, complete propulsion failure.

Routine inspection and timely replacement of cutless bearings are essential for maintaining vessel performance. At G&M Mechanical Engineering, we provide bearing inspection, replacement, and alignment verification to ensure that your propulsion system operates safely and efficiently.

👉 Healthy cutless bearings are not just a detail—they are a key to extending shaft life and guaranteeing smooth sailing.