Mercury Washer 35777

Mercury 35777 is a genuine OEM washer listed in Mercury catalog format as 12-35777. Dealer listings identify it by size as .5156 x 1.375 x .125 and describe it as an aluminum washer used in selected Mercury MerCruiser applications.

Key Features

• Genuine Mercury Marine / Quicksilver OEM hardware
• Part number 35777
• Mercury shorthand listing: 12-35777
• Washer size: .5156 x 1.375 x .125
• Commonly listed as aluminum.

Engine Compatibility
This washer is associated with selected MerCruiser Alpha One and Bravo sterndrive applications in dealer listings. Because washers are often used in very specific stack-up locations, fitment should still be confirmed by the exact model, serial number, and parts diagram before ordering.

Serial Number Fitment Notice
Please confirm compatibility by your exact Mercury MerCruiser serial number before purchase. Small OEM washers can look interchangeable while still differing in diameter and thickness.

When This Part Needs Replacement
Replace this washer when the original is missing, bent, worn, corroded, or no longer providing the correct support or spacing in the assembly. Because this is a size-specific OEM washer, matching the exact part number is the safest way to maintain proper fit. This is a practical service inference based on its exact dimensional listing and hardware role.

Installation Notes
Install only the exact washer specified for the assembly being serviced. On marine hardware, thickness and diameter matter just as much as the bolt or shaft it supports.

Alternate / Superseded Part Numbers

• 12-35777
  No confirmed superseded Mercury part number was established from the sources reviewed.

Parts Desk Insight
A washer like this is simple, but it still does an important job in maintaining clamp load and stack height. Using the exact OEM washer is the smart move when refreshing older MerCruiser hardware assemblies.

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