COLLAR SHAFT 28mm.

Function and technical context

The 28mm shaft collar is an axial positioning and retaining element that works directly on the boat's drive or tail shaft. Its main function is to maintain the shaft in its correct longitudinal position, avoiding unwanted axial displacements that could compromise the alignment between the engine and propeller. This component is part of the transmission and propulsion system, being the part that absorbs the axial forces generated during forward and reverse gear. A collar in poor condition can cause excessive vibrations, accelerated wear of the shaft bearings and loss of propulsive efficiency, which in advanced cases can lead to severe damage to the stuffing box or stern tube.

When to replace this part?

The most common symptoms that indicate a worn or damaged axle collar are noticeable axial play in the axle, abnormal vibrations at certain revolutions, and metallic or knocking noises coming from the tailshaft area while cruising. It is recommended to inspect this component during each seasonal maintenance and replace it if there is any sign of looseness, severe corrosion or visible deformation. Changing the collar preventively is a low-cost intervention that avoids much more costly chain failures, such as deterioration of the stuffing box, the bearings or even the shaft itself.

Compatibility table