Mercury Black Max 9.75x9.5P Aluminum Propeller (25-30 HP)

The Mercury Black Max 9.75x9.5P is an OEM-quality aluminum propeller designed specifically for Mercury and Mariner 25-30 HP outboard engines. As part of Mercury’s best-selling Black Max series, this propeller delivers an ideal mix of performance, durability, and value for small boats. It provides a perfect fit and smooth power transmission, allowing your outboard to perform at its best with minimal vibration.

Featuring a 9.75-inch diameter and a 9.5-inch pitch, this 3-blade prop is engineered to offer strong low-end thrust and quick acceleration. The relatively low pitch enables the engine to rev into its power band quickly, which helps your boat plane off faster even when carrying a load. The broad blades and refined blade geometry bite into the water efficiently, giving small boats the push they need to get on plane and maintain a stable cruise. This makes the propeller an excellent choice for jon boats, inflatables, and other small fishing or utility boats where reliable holeshot performance is important.

Mercury’s Black Max prop comes with a durable black paint finish that resists corrosion and abrasion. This protective coating guards the prop in both freshwater and saltwater conditions, ensuring long-term use without rust or deterioration. Installation is straightforward – the prop features Mercury’s standard 10-spline hub that mounts directly onto the engine’s driveshaft with no modifications. A built-in rubber hub bushing helps absorb shocks and vibrations, protecting your motor’s gearing during shifting. Whether you’re replacing a worn-out prop or upgrading for better performance, the 9.75x9.5P Black Max delivers like-new acceleration and thrust, restoring the performance of your 25-30HP outboard.

Recommended Uses and Applications:

• Optimized for small planing boats (approximately 10–15 ft in length) powered by 25-30 HP engines, delivering quick holeshot and strong thrust to get on plane fast
• Ideal for aluminum fishing boats and inflatable RIBs that carry gear or passengers – the lower 9.5" pitch helps the engine maintain RPM and power under heavier loads
• Great for light tow sports (e.g., towing a small tube or inflatable toy), where the prop’s lower pitch provides improved low-end power for better takeoff and pulling capability
• Suitable for use in both saltwater and freshwater – the rugged coating and quality construction ensure long-lasting performance in corrosive marine environments