PROPELLER NUT 11-40140 REC11-40140

Function and technical context

The M10 propeller nut is the critical fastening element that ensures power transmission from the engine output shaft to the propeller propeller. This part works in the propulsion system, subject to rotation forces (torque) and continuous vibrations that require a robust and reliable anchor. Its correct tightening is essential to avoid slipping or detachment of the propeller during navigation, which could result in total loss of control of the boat or severe damage to the transmission system.

When to replace this part?

Although propeller nuts are designed for long life, they should be inspected regularly at each seasonal maintenance, especially if abnormal vibration, unusual propulsion noise is detected, or if the propeller has been hit by objects. If the thread is deformed, severely corroded or worn, or if the nut does not maintain the correct tightening after several attempts to secure it, it is essential to replace it immediately. Making the preventive change during the annual review guarantees safe navigation and avoids unpredictable breakdowns at sea.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers