Mercury – Black Max 3-Blade Aluminum Propeller | 16" Diameter x 11" Pitch | Right-Hand Rotation | 3-Blade | Aluminum | Phantom Black Finish | 78112A45

Overview

 There’s a certain moment every boater lives for: the surge as your boat lifts effortlessly onto plane, the hum of the motor settling into its rhythm, and the steady pull across open water. That’s what you get with the Mercury Black Max 3-Blade Aluminum Propeller (Part Number 78112A45). Dependable, balanced, and built to handle it all, this prop feels right from the first throttle push. It’s the kind of reliability that makes boating more enjoyable, because when your gear performs flawlessly, you can focus on what really matters: the ride.

Key Features

• Diameter & Pitch: 16" diameter x 11" pitch
• Rotation: Right-Hand
• Blade Count: 3-Blade design for reliable grip and balanced acceleration
• Material: Patented Mercalloy aluminum alloy for exceptional strength and impact resistance
• Finish: Mercury Phantom Black glossy enamel for lasting corrosion protection
• Hub System: Includes Flo-Torq II Hub Kit 835257K1 to protect your drivetrain from impact damage
• Design Details: Engineered for smooth lift, responsive handling, and quiet, vibration-free performance

Engine & Boat Compatibility

• Designed for Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards
• Compatible with Mercury and Mariner 135–300 HP TwoStroke and FourStroke outboards
• Fits MerCruiser Alpha One and Bravo One sterndrives
• Ideal for runabouts, fishing boats, bowriders, and light cruisers that need dependable all-around performance

Performance Benefits

The Black Max 78112A45 brings a refined, confident feel to your time on the water. Hit the throttle, and it digs in, delivering steady, controlled acceleration without excess slip or noise. Once your boat’s on plane, it glides with a clean, even grip that makes steering effortless. Whether you’re cruising at midrange or opening it up for speed, the prop keeps you locked in and balanced.

Mercury’s Mercalloy aluminum gives this prop the perfect combination of strength and flexibility. It’s tough enough for long seasons of use but forgiving enough to handle those small, unexpected bumps every boater faces. The Phantom Black finish resists corrosion and keeps it looking sharp, even after years in saltwater or freshwater. And with the Flo-Torq II Hub System, vibration is reduced while your drivetrain gets an added layer of protection, meaning smoother rides and less maintenance in the long run.

Why is this prop a strong choice vs. alternatives?

• Mercury OEM quality: Built by the same engineers who design Mercury engines, ensuring precise balance, pitch accuracy, and trusted performance straight from the factory.

• Reliable and easy to maintain: Designed for everyday boaters who value durability and simplicity, this prop requires little upkeep and delivers consistent, smooth performance.

• Cost-effective vs. stainless: Offers dependable Mercury quality and handling at a fraction of the cost of stainless-steel options, making it a smart investment for practical boaters.

• Versatile fit across multiple setups: Compatible with a wide range of Mercury outboards and boat types, giving you flexibility without sacrificing performance or reliability.

FAQ Section

Q1: Which Mercury engines does the Black Max 78112A45 fit?

It’s built for 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?

The Black Max is made from Mercury’s exclusive Mercalloy aluminum, strong, durable, and slightly flexible to absorb shock. It also includes the Flo-Torq II Hub System to protect your drivetrain and deliver smoother performance.

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

The 11-pitch design is ideal for boaters looking for strong acceleration, dependable lift, and solid handling under heavier loads. Check your current prop markings or owner’s manual for confirmation.

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

Absolutely. The Phantom Black enamel finish offers long-term corrosion protection in any environment, from inland lakes to coastal bays.

Q5: What hub system does it use?

It includes the Flo-Torq II Hub Kit 835257K1, engineered to absorb shock, reduce vibration, and safeguard your prop shaft from sudden impact damage.