Description

The Mercury MerCruiser Quicksilver 13-423511 is a genuine Mercury Marine OEM toothed lockwasher used in select Mercury, Mariner, and MerCruiser propeller shaft hardware assemblies. This washer is installed in the propeller nut stack where the factory parts diagram calls for 423511 / 13-423511, helping secure the propeller nut and maintain the correct locking interface on compatible outboard and sterndrive gear housings.

Key Features

• Genuine Mercury Marine factory OEM toothed lockwasher.
• Mercury/MerCruiser part number: 13-423511.
• Manufacturer part number: 423511.
• Official part label: LOCKWASHER Toothed.
• GTIN/UPC: 745061061323.
• Listed shipping weight: 0.01 lb.
• Listed shipping dimensions: 1.88 in. L x 1.88 in. W x 0.25 in. H.
• Used in select propeller shaft and prop nut hardware assemblies where specified by Mercury diagram.

Application Compatibility

Common where-used application groups include select Mercury, Mariner, and MerCruiser models by serial number, gearcase, and propeller hardware configuration, including:

• Mercury/Mariner V-135, V-150, V-175, V-200, V-220, 225, 250, and 275 HP outboard applications where specified
• Select Magnum II, Magnum III, XR-4, XR-6, XR-2, XRI, Pro Max, Super Magnum, SeaPro, Marathon, Offshore, and DFI outboard groups where specified
• Select Alpha One / Alpha One Gen II sterndrive applications where specified
• Select Bravo, Bravo Two, and Bravo Three sterndrive applications where specified
• Select high-performance and racing gearcase applications where the parts diagram calls for this washer

Use this lockwasher only where the Mercury/MerCruiser propeller shaft or gear housing diagram specifically calls for 13-423511 / 423511.

Fitment Notice

Confirm fitment by engine or drive serial number, gearcase type, propeller hub system, prop nut hardware stack, and exact Mercury parts diagram before ordering. Mercury uses different lockwashers, tab washers, thrust washers, spacers, prop nuts, and hub hardware across similar horsepower and sterndrive families.

When This Part Needs Replacement

Replace this lockwasher whenever the locking teeth are flattened, cracked, corroded, distorted, or no longer hold the prop nut securely. It should also be replaced during propeller service if the washer has been repeatedly compressed, removed, or damaged during disassembly. Propeller hardware that does not lock properly can allow the prop nut to loosen in service.

Installation Notes

Install this washer in the exact position shown in the Mercury propeller shaft hardware diagram. Inspect the prop nut, thrust washer, spacer, hub components, cotter pin or retaining hardware, and propeller shaft threads while the propeller is removed. Tighten the propeller nut using the Mercury service procedure for the specific gearcase and hub system, then verify the locking washer seats correctly before returning the boat to service.

Alternate/Superseded Part Numbers

• 13-423511 — Mercury/MerCruiser formatted part number
• 423511 — Manufacturer part number

Parts Desk Insight

Propeller hardware should be replaced when it no longer locks cleanly. A toothed lockwasher is a small part, but it works with the prop nut and hub stack to keep the propeller assembly secure, so matching the washer by Mercury part number and diagram location is the safest way to avoid incorrect hardware fit.

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