Aluminum Propeller 9.9x10R for 20-30HP (Universal 3-Blade Prop)

The 9.9x10 aluminum propeller offers a versatile solution for boats powered by engines around the 20-30 HP mark. Thanks to its 10-inch pitch, this prop provides solid out-of-the-hole acceleration without overly sacrificing top speed. That makes it a great all-round choice – whether you’re heading out fishing with a 20 HP motor on a fully equipped boat, or taking the family on a 5-meter runabout with a 30 HP engine, the 9.9x10R handles it confidently. The prop helps the engine maintain optimal RPM under typical load conditions, which translates into better engine reliability and longevity.

Constructed from durable aluminum, this prop withstands daily use and the occasional impact with small debris in the water. A special coating wards off corrosion – crucial for use in saltwater or when the boat sits in the water for extended periods. It’s compatible with the 13-spline shafts of Yamaha, Selva, Parsun, and many other brands in the 25 HP class (many of which share similar gearcases). Installation is identical to the factory prop – simply slide the new prop in place of the old one and secure it with the same nut and cotter pin. Being an OEM-equivalent part, no extra adjustments are needed.

• Ideal Applications: A go-to prop for 4-5 meter boats with 20-30 HP engines, including inflatable RIBs, heavier fiberglass fishing boats, or aluminum utility boats. In these scenarios, the 10″ pitch provides enough thrust to get the boat moving briskly even when loaded with people or gear, while still allowing a decent top speed when the boat is lightly loaded.
• Recommended For: Owners looking for dependable everyday performance from their motor. If you’re uncertain which prop to choose, the 9.9x10 is a safe bet – it’s designed to perform well in most conditions without over-stressing the engine or giving up too much on the speed end.
• Advantage as a Spare: Even if you use another specialized prop (like a higher or lower pitch) for specific purposes, the 9.9x10 makes an excellent spare. In case your primary prop gets damaged, this one can take over, providing balanced performance while you repair or replace the main propeller.
• Compatibility: Engineered to Yamaha standards (equivalent to orig. code 664-45945-00), this prop fits a wide array of models – Yamaha 20-25 HP two-strokes, Selva 20-30 HP, Parsun 25, etc. Some 1990s Mercury/Mariner 25 HP (with Japanese gearcases) can also use this prop. This broad compatibility highlights the flexibility and practicality of the 9.9x10R as a solution for many different boats.