FLAT COLLAR 63.5mm.

Function and technical context

The 63.5mm Flat Collar is a fastening and positioning element that acts as a retaining or separating piece within a vessel's drive or shaft assembly, ensuring that adjacent components maintain correct alignment and axial play during operation. Its mission is to prevent longitudinal displacement of the axles, pulleys or gears on which it is installed, ensuring that each component rotates in its intended position without axial migration. A worn, broken or poorly adjusted collar can cause abnormal vibrations, accelerated wear of adjacent bearings and seals, and even premature failure of higher-cost components in the driveline or auxiliary systems of the marine engine.

When to replace this part?

The most common symptoms that indicate that the flat collar needs to be replaced are: noticeable axial play in the shaft, rattling or vibration noises at low and medium revolutions, and visible marks of wear, rubbing or deformation on the bearing surface of the collar. It is recommended to visually inspect this component during each seasonal maintenance and replace it whenever looseness, advanced corrosion or loss of section is detected. Replacing the flat collar preventively during any intervention on the transmission or shaft is a practice that avoids chain failures that can leave the boat immobilized at sea.

Compatibility table