Aluminum Propellers for 25–30 HP Tohatsu Outboard Boat Motor
Selecting the perfect propeller can dramatically refine how your boat accelerates, maneuvers and cruises. Our precision-cast aluminum propellers are tailored for 3″, 10-spline lower units—standard on Tohatsu 25–30 HP models (1985–present) and fully compatible with similarly configured Yamaha, Mercury, Suzuki, Honda and Volvo outboards. In the sections that follow, you’ll find in-depth technical details, performance guidance and real-world advice to help you choose—and get the most from—your next propeller.
Comprehensive Specifications
| OEM Number | Blades | Diameter (in) | Pitch (in) | Rotation |
|---|---|---|---|---|
| 3ROB645210 | 3 | 9.7 | 10 | R |
| 3R0B64518-0 | 3 | 9.8 | 9 | R |
| 3R0B645230 | 3 | 9.8 | 11 | R |
| 3ROB46518-1 | 3 | 9.9 | 9 | R |
| 3ROB46521-1 | 3 | 9.9 | 10 | R |
| 3ROB64523-1 | 3 | 9.9 | 11 | R |
| 3R0B64525-0 | 3 | 9.9 | 12 | R |
| 34664104-5 | 3 | 9.9 | 13 | R |
| 349864529-1 | 3 | 9.9 | 14 | R |
| 3 | 9.9 | 15 | R | |
| 3 | 10.25 | 9 | R | |
| 3 | 10.25 | 10 | R | |
| 3 | 10.25 | 11 | R | |
| 3 | 10.25 | 12 | R | |
| 3 | 10.25 | 13 | R | |
| 3 | 10.25 | 14 | R | |
| 3 | 10.25 | 15 | R | |
| 4 | 10.00 | 5 | R | |
| 4 | 10.00 | 7 | R | |
| 4 | 10.00 | 9 | R | |
| 4 | 10.10 | 13 | R | |
| 4 | 10.10 | 14 | R | |
| 4 | 10.10 | 15 | R | |
| 4 | 10.20 | 11 | R | |
| 4 | 10.20 | 12 | R |
Why Aluminum Propellers?
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Lightweight Strength
Aircraft-grade aluminum alloys combine corrosion resistance with impact resilience. You get a prop that won’t rust, dents less easily and still delivers reliable thrust. -
Precision Casting
Each blade profile is crafted within tight tolerances. That means consistent pitch, balanced rotation and smoother power delivery from idle to wide-open throttle. -
Affordability & Availability
Compared to stainless steel, aluminum props come at a lower cost while still offering excellent wear characteristics—ideal for recreational boaters, fishing guides and rental fleets alike.
Blade Count: Optimizing Thrust vs. Speed
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Three-Blade Designs
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Acceleration: Strong hole-shot and rapid plane time.
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Best For: Towing skiers or tubes, heavy loads, frequent quick starts.
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Four-Blade Designs
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Grip: Enhanced thrust in chop and wake.
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Ride Quality: Smoother mid-range performance with slightly reduced top-end.
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Best For: Fishing in rough water, precision maneuvering, minimizing prop slip.
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Diameter & Pitch: Dialing In Performance
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Low Pitch (9″–11″)
Feels like a sport-scar gearbox: quick off the line, ideal for loaded runs. Top speed remains modest. -
Mid Pitch (12″–14″)
Offers a balanced blend of pickup and velocity. Perfect for anglers switching between trolling, drifting and light cruising. -
High Pitch (15″)
Locks in maximum speed under light load. Go this route when you’re solo or carrying minimal gear and chasing flat-water speed.
Installation & Fitment Checklist
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Spline/Hole Pattern: 10-spline, 3″ hub diameter
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Engine Compatibility:
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2-stroke 25 HP/30 HP (1985–2001)
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4-stroke 25 HP/30 HP (2002–present)
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Rotation: Right-hand only
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Deck & Clearance: Verify cavitation plate height and skeg clearance before installation
Real-World Selection Guide
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Assess Your Typical Load
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Family outings? Pick a mid-pitch, three-blade for versatile performance.
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Solo runs or light fishing? A high-pitch prop in four blades will maximize speed.
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Consider Water Conditions
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Flat, calm lakes reward higher-pitch props.
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Wind-driven chop or river currents demand the extra bite of low-pitch, four-blade designs.
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Trial & Adjustment
Small pitch changes (½″ increments) often yield significant differences in RPM and fuel efficiency. Test two or three close options to discover your boat’s “sweet spot.”
Maintenance & Longevity
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Regular Inspections: Check blade tips and leading edges for nicks or bends after each outing.
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Cleaning: Rinse with fresh water and mild detergent; avoid acidic cleaners that can pit aluminum.
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Storage: Keep props covered or inside when not in use to prevent UV-driven oxidation and mechanical damage.
Expert Support
Our technical team lives and breathes propeller dynamics. Questions about matching blade count, diameter or pitch to your specific boating style? Reach out with your engine details and load profile. We’ll guide you through selection, installation tips and performance tuning—so every outing on your 25–30 HP Tohatsu is as efficient and enjoyable as possible.
Embark on your next adventure with confidence: the right aluminum propeller is waiting.