Mercury – Black Max 3-Blade Aluminum Propeller | 15.5" Diameter x 15" Pitch | Right-Hand Rotation | 3-Blade | Aluminum | Phantom Black Finish | 78116A45

Overview

There’s a certain kind of satisfaction that comes from easing the throttle forward and feeling your boat respond—steady, confident, and smooth. The Mercury Black Max 3-Blade Aluminum Propeller (Part Number 78116A45) is built for that exact moment. It’s the kind of prop you count on whether you’re running across glassy morning water or cutting through an afternoon chop. Dependable, forgiving, and refined, it has that signature Mercury balance that makes boating feel effortless. For many boaters, it’s not just a prop—it’s the heartbeat of their weekend adventures.

Key Features

• Diameter & Pitch: 15.5" diameter x 15" pitch for a well-rounded blend of speed and lift
• Rotation: Right-Hand rotation for standard outboard and sterndrive setups
• Blade Count: 3-Blade configuration designed for smooth cruising and reliable acceleration
• Material: Crafted from Mercury’s patented Mercalloy aluminum alloy—strong yet slightly flexible to handle minor impacts
• Finish: Mercury Phantom Black enamel coating for sleek looks and corrosion resistance
• Hub System: Comes with the Flo-Torq II Hub Kit 835257K1 to absorb shock and protect the drivetrain
• Design Details: Balanced blade geometry engineered for quiet operation and efficient thrust across a wide speed range

Engine & Boat Compatibility

• Fits Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards
• Compatible with Mercury and Mariner 135–300 HP TwoStroke and FourStroke outboards
• Works with MerCruiser Alpha One and Bravo One sterndrives
• Perfect for runabouts, fishing boats, pontoons, bowriders, and small cruisers

Performance Benefits

The Mercury Black Max 78116A45 propeller delivers more than just dependable performance—it transforms the way your boat feels on the water. Acceleration is crisp and predictable, with a confident grip that gets your hull up on plane without hesitation. Once you’re cruising, you’ll appreciate how steady it feels, holding speed with minimal vibration and a quiet, composed attitude.

Thanks to Mercury’s Mercalloy construction, the prop has the right mix of rigidity and give. It’s tough enough to handle long days under load, yet flexible enough to absorb minor bumps or debris impacts that could damage a stiffer prop. You’ll notice how forgiving it feels when docking, trolling, or navigating shallows—it’s built for real-world boating, not just perfect conditions.

The glossy Phantom Black finish adds more than style—it resists corrosion and keeps your prop looking sharp season after season. For anyone who values smooth handling and reliability, this Mercury propeller just feels right.

Why is this prop a strong choice vs. alternatives?

• Mercury OEM quality: Designed and built by Mercury’s own engineers for precise balance, durability, and performance.
• Reliable and easy to maintain: Simple installation and low upkeep make it a dependable choice for weekend boaters and seasoned pros alike.
• Cost-effective vs. stainless: Offers excellent performance and longevity without the higher cost or stiffness of stainless steel props.
• Versatile fit across multiple setups: Compatible with a wide range of Mercury and Mariner outboards and sterndrives, covering everything from pontoons to sport boats.

FAQ Section

Q1: Which Mercury engines does the Black Max 78116A45 fit?

It fits Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards, 135–300 HP TwoStroke and FourStroke outboards, and MerCruiser Alpha One and Bravo One sterndrives.

Q2: What makes this propeller different from other Mercury options?

It’s crafted from Mercury’s exclusive Mercalloy aluminum alloy, giving it a strong yet forgiving build. The Flo-Torq II Hub System helps absorb impact and reduce drivetrain stress, providing smoother, quieter operation.

Q3: How do I know if this pitch or size is right for my boat?

The 15-pitch design offers balanced performance—quick planing, dependable cruising speed, and smooth midrange power. Check your current prop size or owner’s manual for best-fit guidance.

Q4: Can this prop be used in both saltwater and freshwater?

Yes. The Phantom Black enamel finish provides corrosion protection for reliable performance in any environment.

Q5: What hub system does it use?

It includes the Flo-Torq II Hub Kit 835257K1, designed to cushion drivetrain components and minimize vibration for smoother rides and longer prop life.