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 (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 matters 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 blades
• 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 efficiently without sacrificing stability.

Once you’re cruising, the ride stays consistent and steady, even as loads shift or conditions change. The Mercalloy aluminum construction provides the strength needed for everyday use while remaining flexible enough to absorb light impacts. The rubber hub bushing reduces vibration and noise, making longer runs easier on your hands and equipment.

The Phantom Black finish adds durable corrosion protection for both freshwater and saltwater use. Maintenance is simple—rinse, inspect, and get back on the water. It’s the kind of propeller you install once and rely on all season.

Why This Prop Is a Strong Choice vs. Alternatives

• Mercury OEM Quality: Designed and tested by Mercury engineers for precise fit and long-term reliability
• Durable Yet Forgiving: Mercalloy aluminum flexes under light impact to help protect the drivetrain
• Smooth and Quiet Operation: Rubber hub reduces vibration for comfortable handling
• Affordable Performance: Delivers trusted Mercury performance without the cost of stainless steel
• Versatile Fit: Ideal for a wide range of small Mercury and Mariner outboards

FAQs

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 uses Mercury’s Mercalloy aluminum construction with a rubber hub that absorbs shock, reduces vibration, and helps protect the drivetrain.

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 solid acceleration with stable cruising performance, this 10.375 x 13 setup is a strong match.

Q4: Can this prop be used in both saltwater and freshwater?
Yes. The Phantom Black enamel coating provides corrosion resistance for both environments. Rinsing after saltwater use is recommended.

Q5: What hub system does it use?
It includes a rubber bushing hub that cushions the drivetrain, reduces vibration, and supports smooth, quiet operation.