Description

Mercury 18448 is a genuine OEM thrust washer used in selected Mercury and MerCruiser drivetrain applications. Dealer listings show the Mercury shorthand format 12-18448, and current parts diagrams place it in bearing and carrier-style assemblies where proper thrust control matters.

Key Features

• Genuine Mercury Marine / Quicksilver OEM part
• Part number 18448
• Mercury shorthand listing: 12-18448
• Identified as a thrust washer
• Common dealer shipping data lists it at about 0.02 lb and roughly 2.25 x 2.25 x 0.25 in packaged size.

Engine Compatibility
This thrust washer is associated with a broad range of Mercury high-performance and outboard applications, including listings for Magnum II, Magnum III, V-115 DFI 2.5L, V-135, V-150, V-175, V-200, XR-4, XR-6, and selected 250XS / 300X / 300XS performance models, depending on serial range and assembly. Exact fitment should always 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 serial number and the correct assembly diagram before purchase. This is especially important with thrust washers because they are used inside specific bearing-stack and carrier assemblies rather than as a universal washer. That is supported by current diagram placement showing 18448 alongside thrust bearing, race, and keeper components.

When This Part Needs Replacement
This part is typically replaced during lower-unit or gearcase service when the original thrust washer is worn, damaged, grooved, or being renewed during a bearing-stack rebuild. That service context is an inference based on its documented role as a thrust washer and its placement beside thrust-bearing components in OEM diagrams.

Installation Notes
Install only the exact thrust washer specified for the application being serviced. Because Mercury uses thrust washers in precise internal assemblies, matching the correct part number, model, and serial range is the safest way to maintain proper stack-up and component positioning.

Alternate / Superseded Part Numbers

• 12-18448
  No confirmed superseded part number was established from the sources reviewed.

Parts Desk Insight
A thrust washer may look simple, but it plays an important role in controlling load and spacing inside the assembly. On Mercury driveline and gearcase components, using the exact OEM washer helps keep the bearing stack supported the way the factory intended. This is a practical service inference supported by the way 18448 appears in OEM bearing-and-race assemblies.

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