Description

Mercury 20086 is a genuine OEM washer identified in Mercury catalog format as 12-20086. Dealer listings describe it as Washer (.390 x .620 x .06), making it a small but exact-dimension service washer used across a wide range of older Mercury outboard and MerCruiser applications.

Key Features

• Genuine Mercury Marine / Quicksilver OEM part
• Part number 20086
• Mercury shorthand listing: 12-20086
• Washer dimensions listed as .390 x .620 x .06
• Pack of 5 washers for service stock or multi-point repairs

Engine Compatibility
This washer appears across a very broad range of Mercury applications, including numerous classic Mercury outboards and early MerCruiser platforms. Dealer fitment listings show it used on many older 4-cylinder and 6-cylinder outboards, Mark-series models, and early sterndrive families including Alpha One Gen I-era applications, which means exact fitment should be confirmed by model and serial number before ordering.

Serial Number Fitment Notice
Please confirm compatibility in the Mercury Parts Catalog using your exact engine or drive serial number before purchase. Mercury’s official catalog is organized by serial number for accurate parts lookup and diagram matching.

When This Part Needs Replacement
Replace this washer when the original is missing, deformed, corroded, worn, or no longer providing the correct spacing or clamping support in the assembly. Because this is a dimension-specific OEM washer, matching the exact part number is the safest way to maintain proper fit during reassembly. This is a practical service inference based on the part’s exact dimensional listing and broad OEM usage.

Installation Notes
Install only the exact washer specified in the parts diagram for the application being serviced. Small hardware like this can look interchangeable, but thickness and diameter matter when Mercury calls for a specific washer size.

Alternate / Superseded Part Numbers

• 12-20086
  No confirmed superseded part number was established from the sources reviewed.

Parts Desk Insight
Washers are easy to overlook, but the right OEM one helps keep stack height, clamping force, and hardware fit the way Mercury intended. Keeping a small pack on hand can be useful when refreshing older assemblies where original hardware is being replaced piece by piece.

Shipping: Ships same or next day for fast Canada wide shipping.