Mercury – Black Max 3-Blade Aluminum Propeller | 10.375" Diameter x 13" Pitch | Right-Hand Rotation | 3 Blades | Aluminum | Glossy Black Finish | 19640A40

Overview

Every boater has that one piece of equipment they never have to think twice about — the one that just works, season after season. The Mercury Black Max 10.375 x 13 Aluminum Propeller (Part Number 19640A40) is exactly that kind of gear. It’s dependable, easy to trust, and built for the kind of boating most of us actually do — where reliability means more than shine. When you hit the throttle and feel that clean, steady pull, you’ll know you’ve got the right prop under you.

Key Features

• Diameter and Pitch: 10.375" Diameter x 13" Pitch
• Rotation: Right-Hand
• Blade Count: 3
• Material: Patented Mercalloy Aluminum Alloy
• Finish: Mercury Phantom Black Gloss Enamel
• Hub System: Durable rubber bushing absorbs shock and reduces vibration
• Design Details: Balanced, forgiving design that delivers steady thrust and control — even after years of use

Engine & Boat Compatibility

• Fits Mercury and Mariner 9.9 HP and 15 HP FourStroke BigFoot outboards (1999–2004)
• Works with Mercury and Mariner 20–25 HP TwoStroke Classic outboards (1980–2006)
• Compatible with Mercury 25 HP SeaPro and Marathon outboards
• Ideal for small fishing boats, utility skiffs, dinghies, and light-duty workboats

Performance Benefits

The Mercury Black Max 19640A40 isn’t flashy — it’s dependable. From the moment you throttle forward, the prop grips cleanly and pushes your boat ahead with a smooth, confident pull. Its compact size gives it a quick bite, helping smaller boats plane fast without losing stability. You’ll feel how balanced it is right away — no chattering, no vibration, just clean motion through the water.

Once you’re cruising, the ride stays consistent and steady, even as the load shifts or the chop picks up. The Mercalloy aluminum material keeps things strong but flexible enough to handle light bumps or debris without serious damage. The rubber hub bushing dampens vibration and noise, making long runs easier on your hands, arms, and gear.

The Phantom Black finish isn’t just for looks — it’s a durable barrier against corrosion, whether you’re running freshwater lakes or brackish coastal water. Maintenance is about as simple as it gets: rinse, check the hub, and you’re back on the water. It’s the kind of prop you put on once and trust to perform all season.

Why This Prop Is a Strong Choice vs. Alternatives

• Mercury OEM Quality: Crafted and tested by Mercury’s engineers for precision fit and lasting reliability.
• Durable Yet Forgiving: Mercalloy aluminum flexes under light impact, protecting the prop and drivetrain.
• Smooth and Quiet Operation: The rubber hub absorbs vibration for steady, comfortable handling.
• Affordable Performance: Delivers reliable Mercury quality without the price tag of stainless steel.
• Versatile Fit: Perfect for smaller outboards across a wide range of boat types — dependable and easy to maintain.

FAQ Section

Q1: Which Mercury engines does the Mercury Black Max 19640A40 fit?
It fits Mercury and Mariner FourStroke BigFoot 9.9–15 HP outboards (1999–2004), 20–25 HP TwoStroke Classic outboards (1980–2006), and 25 HP SeaPro and Marathon models.

Q2: What makes this propeller different from other Mercury options?
It’s made from Mercury’s exclusive Mercalloy aluminum with a rubber hub that absorbs shock, reducing vibration and helping protect your drivetrain from damage.

Q3: How do I know if this pitch or size is right for my boat?
If your boat uses a 9.9–25 HP outboard and you want quick acceleration with stable cruising power, this 10.375 x 13 setup is an excellent match.

Q4: Can this prop be used in both saltwater and freshwater?
Yes. The Phantom Black enamel coating provides long-lasting corrosion protection for both environments. Just rinse it after saltwater use.

Q5: What hub system does it use?
It includes a rubber bushing hub, which cushions your drivetrain from impacts and keeps operation smooth and quiet.