Description

Mercury MerCruiser / Quicksilver Propeller Nut Kit – 69578Q1

Secure your propeller properly with the genuine Mercury Marine / Quicksilver 69578Q1 Propeller Nut Kit. This OEM hardware kit provides the locking nut and washers required to safely mount and secure the propeller to the prop shaft on compatible Mercury and Mariner outboard engines.

Manufactured to Mercury Marine’s original equipment specifications, the kit ensures proper propeller retention while preventing the nut from loosening due to vibration during operation.

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Key Features

• Genuine Mercury / Quicksilver OEM propeller nut kit

• Secures the propeller to the prop shaft

• Includes locking hardware to prevent loosening

• Designed for reliable marine performance and durability

• Direct replacement for original Mercury propeller hardware

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Kit Includes

Typical kit components include:

• Propeller lock nut (nylock style)

• Tab or lock washers

(Some revisions include additional washers depending on application.)

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Compatible Mercury / Mariner Engines

Commonly used on Mercury and Mariner outboard engines, including:

• 25 HP outboards

• 30 HP outboards

• 40 HP outboards

• 45 HP outboards

• 50 HP outboards

• 55 HP outboards

• 60 HP outboards

Many 2-stroke and 4-stroke models within these horsepower ranges use this propeller nut kit depending on serial number and gearcase design.

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Cross Reference

• Mercury 11-69578Q1

• Mercury 11-69578A1 / 11-69578T1

• Sierra 18-3702 aftermarket equivalent

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Function

The propeller nut kit locks the propeller firmly onto the prop shaft spline, ensuring the prop stays secured under heavy thrust loads and preventing loosening caused by vibration or reverse thrust.

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Important Compatibility Note

Propeller hardware varies by engine horsepower, propeller hub system, and prop shaft spline type. Always verify compatibility using the engine serial number and propeller hub system before ordering.

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