1 1/4 SHAFT COLLAR

Function and technical context

The shaft collar is an axial retention and positioning element that works directly on the boat's transmission shaft, keeping it correctly aligned and avoiding unwanted longitudinal displacements during navigation. This component is part of the transmission system between the engine and the propeller, acting as a support point and stop that absorbs the axial forces generated by the thrust of the propeller. Its correct installation is essential to preserve the integrity of the stuffing box, the tail bearings and the shaft itself, since any looseness or failure in the collar can result in abnormal vibrations, accelerated wear of adjacent components and even water entry into the hull due to deterioration of the sealing system.

When to replace this part?

The most common symptoms of a deteriorated or excessive play shaft collar include noticeable vibrations in the hull at certain revolutions, metallic noise coming from the shaft line, and irregular or premature wear of the stuffing box or tube. It is recommended to inspect the collar during each seasonal maintenance, checking that it does not present corrosion, cracks or play with respect to the shaft; In salt water environments the review must be especially rigorous given the higher rate of galvanic corrosion. Replacing the collar preventively at the slightest sign of wear is the most economical decision in the long term, since a failure in navigation can compromise the entire transmission line.

Compatibility table