Mercury Black Max 14.25x 21P Propeller 48-832832A45

Mercury Black Max Aluminum Propeller – 14.25” x 21” Pitch, Right-Hand (48-832832A45)

Upgrade your boat’s performance with the Mercury Black Max 14.25” x 21” Aluminum Propeller (48-832832A45). Engineered for precision and reliability, this prop is crafted from Mercury’s exclusive Mercalloy® aluminum alloy—offering the ideal blend of durability, efficiency, and smooth performance for engines under 250 HP.

This propeller includes the 835257K-1 Flo-Torq II Hub Kit, ensuring easy installation and optimal fit on most Mercury and MerCruiser outboards and sterndrives.

Why Choose the Mercury Black Max Propeller

• Enhanced Performance: The precision-balanced 3-blade design minimizes drag for quicker acceleration and improved fuel economy.
• Durable Construction: Built from corrosion-resistant Mercalloy® aluminum for lasting performance in both freshwater and saltwater environments.
• Easy to Maintain: Lightweight and simple to clean or repair, making it a practical choice for recreational boaters and anglers.
• Ideal Fit: Best suited for boats with top speeds under 50 MPH—offering reliable, all-around performance across a variety of hull types.

Specifications

Key Features

• Die-cast aluminum construction for strength and balance
• Excellent all-around value and performance
• Standard right-hand rotation
• Compatible with most Mercury and MerCruiser engines under 250 HP

Compatibility & Fit

Use our Propeller Finder Tool or contact our marine experts for personalized guidance to ensure the best fit for your engine and boating style.

Frequently Asked Questions

How do I install this propeller?

The Mercury Black Max comes with installation instructions and the Flo-Torq II hub kit. All you need is a prop wrench—installation is simple and straightforward.

Does this propeller include a warranty?

Yes. Mercury propellers come backed by a manufacturer’s limited warranty for added peace of mind.

Why should I choose an aluminum propeller?

Aluminum props are lightweight, affordable, and deliver excellent all-around performance—ideal for recreational and freshwater boating. They’re also easier and less expensive to repair or replace than stainless steel props.

What’s the difference between a 3-blade and 4-blade propeller?

A 3-blade propeller offers higher top-end speed and better efficiency, while a 4-blade prop improves acceleration, handling, and grip in rough water—though it may slightly reduce top speed.

Is a 21-pitch prop right for my boat?

If you’re satisfied with your boat’s current performance, match your existing prop pitch. To adjust performance, see the next question below.

How do I know if I should go up or down in pitch?

Go up in pitch if your engine hits max RPMs too easily—this can increase top speed but reduce acceleration.
Go down in pitch if your engine struggles to reach its recommended RPM range—this boosts hole shot and pulling power but may lower top speed.

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