Mercury MerCruiser Quicksilver Propeller Nut Kit 69578Q1
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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.
Key Features
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Genuine Mercury / Quicksilver OEM propeller nut kit
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Secures the propeller to the prop shaft
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Includes locking hardware to prevent loosening
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Designed for reliable marine performance and durability
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Direct replacement for original Mercury propeller hardware
Kit Includes
Typical kit components include:
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Propeller lock nut (nylock style)
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Tab or lock washers
(Some revisions include additional washers depending on application.)
Compatible Mercury / Mariner Engines
Commonly used on Mercury and Mariner outboard engines, including:
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25 HP outboards
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30 HP outboards
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40 HP outboards
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45 HP outboards
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50 HP outboards
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55 HP outboards
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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.
Cross Reference
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Mercury 11-69578Q1
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Mercury 11-69578A1 / 11-69578T1
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Sierra 18-3702 aftermarket equivalent
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.
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.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.