Mercury – SpitFire 4-Blade Aluminum Propeller | 14” Diameter x 14” Pitch | Right-Hand Rotation | 4 Blades | Aluminum | Polished Finish | 8M0084493

Overview

There’s something about the feel of a boat that leaps forward the instant you hit the throttle — steady, confident, and full of pull. That’s what you get with the Mercury SpitFire 4-Blade Aluminum Propeller (Part Number 8M0084493). It’s not just another four-blade prop; it’s one that surprises you with speed that rivals a three-blade, while holding the kind of grip that makes tight turns feel effortless. Whether you’re chasing glassy water at sunrise or heading home with the wind at your back, this prop keeps you in control — smooth, balanced, and ready for whatever the water throws your way.

Key Features

• Diameter and Pitch: 14” Diameter x 14” Pitch

• Rotation: Right-Hand

• Blade Count: 4-Blade design for enhanced grip and lift

• Material: Patented Mercalloy aluminum alloy for strength and ductility

• Finish: Polished aluminum finish for lasting performance

• Hub System: Flo-Torq II Hub Kit (Part Number 835257K1) included for drivetrain protection

• Design Details: Aggressive blade geometry for fast acceleration and responsive handling

Engine & Boat Compatibility

• Works perfectly with Mercury and Mariner 90–115 HP FourStroke Command Thrust outboards

• Fits Mercury and Mariner 135–300 HP TwoStroke and FourStroke outboards

• Compatible with MerCruiser Alpha One and Bravo One sterndrives

• Ideal for a variety of boats — from runabouts and fishing boats to sporty pontoons — giving you steady lift and control at all speeds

Performance Benefits

This prop isn’t shy about showing off its power. The SpitFire’s unique four-blade geometry grabs the water with purpose, giving you 16–25% faster acceleration compared to a similar three-blade propeller. You’ll feel that instant push — the kind that gets you on plane quicker and keeps your ride steady even in chop. It delivers confident cornering, sharp midrange bite, and smooth cruising speeds that let you stay in command without overworking your engine.

Crafted from Mercury’s patented Mercalloy aluminum, it’s tough enough to handle the knocks and bumps that come with real-world boating. And with the Flo-Torq II Hub Kit, you’ll get added protection against minor impact damage — a small but meaningful detail when you’re far from the dock. Maintenance is simple, durability is proven, and the performance speaks for itself.

Why is this prop is a strong choice vs. alternatives?

If you’ve ever swapped between props, you know how much difference a good one makes. The SpitFire stands out because it balances all the things that matter — speed, control, and reliability — without jumping to the cost of stainless steel. You’re getting genuine Mercury OEM quality, designed and tested by the same engineers who build their legendary engines. It’s a prop that fits easily across multiple setups, holds up to both fresh and saltwater, and keeps your boat running at its best season after season. For boaters who want an honest mix of performance and value, this one earns its spot.

FAQ

Q1: Which Mercury engines does the SpitFire 4-Blade 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?
The SpitFire combines the speed of a three-blade with the control and lift of a four-blade, giving you better acceleration and smoother turns without sacrificing top-end performance.

Q3: How do I know if this pitch or size is right for my boat?
If your current setup runs a 14” pitch and your engine stays within the manufacturer’s recommended RPM range, this prop should perform beautifully. Always check your engine’s manual or consult your dealer for exact specs.

Q4: Can this prop be used in both saltwater and freshwater?
Absolutely. The aluminum alloy and finish are built to handle both environments, though regular cleaning after saltwater use will help extend its life.

Q5: What hub system does it use?
It comes with the Flo-Torq II Hub Kit (Part Number 835257K1), designed to protect your engine’s drivetrain from most minor impact damage.