Mercury Black Max Aluminum Propeller 10 3/8 x 11 for 9.9-25HP Outboards (10 spline)

The Mercury Black Max 10 3/8 x 11 is the standard aluminum propeller that many new Mercury outboard engines come equipped with from the factory. If you’re looking to replace a worn prop or add a spare for your small outboard, the Black Max offers an excellent solution with the assurance of genuine Mercury quality. With a diameter of 10.375″ and a 11″ pitch, this prop is tuned to provide a good balance of acceleration and top-end speed for engines in the 9.9 to 25 horsepower range.

Characteristics & Performance: The 11″ pitch allows the engine to reach adequate RPM without overloading it – this is especially important for 9.9-15 HP two-stroke motors, which have a specific optimal rev range. The Black Max’s blades feature Mercury’s classic geometry, ensuring a smooth flow of water and minimal vibration. The propeller comes with a factory-pressed rubber hub, which acts as a cushion: if you strike an underwater object, the hub absorbs the shock and helps protect your engine’s gearcase from damage.

The prop’s black finish isn’t just for looks – it’s a durable coating designed to resist saltwater corrosion and wear. Maintenance is straightforward: after saltwater use, rinse the prop with fresh water, and periodically check for any fishing line or debris wrapped around the hub area.

What boats is it recommended for? The Mercury Black Max 10-3/8x11 is commonly found on small fishing boats, jon boats, RIBs or inflatable dinghies powered by 9.9, 15, or 20 HP engines. It’s suitable for vessels roughly 10 – 15 feet long. With this propeller, your boat will have confident acceleration, easy handling at mid-range throttle, and decent top speed at wide-open throttle. Meanwhile, the Black Max is known to deliver a smooth ride with minimal vibrations, making it a favorite choice for both casual boaters and professionals alike.

Why Choose Black Max:

• Factory Performance: As an OEM prop, it’s specifically engineered to match Mercury’s small engines, ensuring you get the performance the manufacturer intended
• Affordability: The Black Max line offers an excellent price-to-performance ratio – a cost-effective choice without sacrificing quality
• Versatility: Whether you use your boat for fishing, leisure cruising, or as a tender, this prop provides reliable all-around performance
• Trusted by Boaters: Mercury’s Black Max has been a go-to prop for decades, trusted for its durability and consistent results. Keeping a spare Black Max on board is cheap insurance to avoid downtime on the water in case of prop damage