FLAT COLLAR 115mm.

Function and technical context

The 115mm flat collar is a fastening and sealing element that acts as a retaining piece or structural support within the transmission or shaft line coupling assembly on outboard and inboard marine engines. Its main function is to maintain correct alignment between rotating or fixed components, avoiding axial displacements and guaranteeing the mechanical integrity of the assembly. A collar in poor condition or with looseness can cause abnormal vibrations, misalignment of the transmission shaft and, in extreme cases, progressive damage to bearings, seals and adjacent, higher-cost parts. The 115 mm measurement makes it specific for specific applications where dimensional tolerance is critical for the correct functioning of the system.

When to replace this part?

The most common signs of wear on a flat collar include noticeable play in the shaft, unusual vibrations at certain revolutions, clunking noises in the drive zone, or visual evidence of warping, corrosion, or cracks in the collar. It is recommended to inspect this component at each seasonal inspection or each time the shaft line, coupling or transmission system is intervened. Replacing the collar preventively if there is any sign of wear prevents breakdowns at sea that compromise the safety of the boat and lead to larger repairs.

Compatibility table