WASHER 12-13305M REC90209-27M07

Function and technical context

The 12-13305M Washer is a precision metal fastening component that evenly distributes tightening load on marine engine fastening systems. This piece acts as an intermediary element between nuts or screws and the mounting surfaces, preventing the screw head from sinking and guaranteeing a balanced distribution of stresses in the critical engine anchors. In high marine vibration environments, where mechanical stresses are constantly transmitted through the propeller structure, this washer is essential to maintain the integrity of the joints and avoid progressive loosening that would compromise the stability of the engine.

When to replace this part?

Washers should be inspected during each seasonal maintenance check, especially in critical fastening areas where corrosion, deformation or abnormal pressure marks are detected on the mating surface. If pitting, irreversible crushing or loss of thickness is observed upon disassembly of the washer, it must be replaced immediately to restore the load distribution capacity. Preventive replacement of damaged washers is an economical measure that avoids complex repairs resulting from the loosening of vital components during navigation.

Engine Compatibility

Mercury/MerCruiser

Equivalent manufacturer part numbers