FLAT NECKLACE 38mm.

Function and technical context

The 38 mm flat collar is a fastening and positioning element that acts as a retaining or guiding piece in mechanical assemblies of marine engines, generally associated with shafts, transmission rods or components of the steering and drive system. Its main function is to maintain the axial position of a rotating or sliding component, avoiding unwanted longitudinal displacements that compromise the correct functioning of the assembly. The integrity of this collar is essential to ensure that the design clearances are respected: a worn or damaged collar can result in abnormal vibrations, metallic noises and, in extreme cases, loss of control of the mechanism to which it is associated.

When to replace this part?

The most common symptoms indicating deterioration of a flat collar are excessive axial play in the shaft or rod on which it is mounted, rattling or knocking noises during operation, and visible wear on the bearing faces of the collar. It is recommended to inspect this part during each seasonal maintenance, since continuous exposure to the marine environment - saline humidity, vibrations and thermal cycles - accelerates its degradation. Replacing the collar preventively when any irregularity is detected prevents more costly breakdowns in adjacent components and ensures the safety of the vessel while underway.