FLAT COLLAR 2 1/4

Function and technical context

The 2 1/4" flat collar is a fastening and positioning element that acts as a stop or spacer in rotating or transmission assemblies in outboard marine engines and nautical propellers. Its main function is to maintain the axial alignment of the shaft components, avoiding unwanted longitudinal displacements that could compromise the integrity of the assembly. It usually works in the transmission or propulsion system, where dimensional precision is decisive for the correct operation of the power train. A collar in poor condition or with excessive play It can cause abnormal vibrations, accelerated wear of adjacent components and, in severe cases, damage to the shaft or gearbox.

When to replace this part?

The most common symptoms of a worn or damaged flat collar include unusual vibrations transmitted to the hull or control knob, clunking in the shaft area during acceleration, and noticeable play in the drive assembly. It is recommended to visually inspect this component during each seasonal maintenance, paying special attention to the appearance of friction marks, deformations or galvanic corrosion, especially common in saltwater environments. Replacing the collar preventively at any sign of wear prevents progressive breakdowns that can lead to costly out-of-port repairs.

Compatibility