Stainless Steel Propellers for 35–50 HP Tohatsu Outboard Boat Motor
When your boat relies on a 35–50 HP Tohatsu outboard, every detail—from blade shape to pitch—matters. Our stainless steel propellers are engineered for peak durability and efficiency, fitting a 3¼″, 13-spline gearcase across multiple model years. No official branding claims here: we simply build propellers that work seamlessly on Tohatsu, Yamaha, Mercury and similar engines.
Why Choose Stainless Steel?
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Long-Lasting Strength. Unlike aluminum, stainless steel resists dings and holds its shape under high loads.
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Sharper Hydrodynamics. Thinner blades penetrate water cleanly for faster acceleration.
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Corrosion Protection. Marine-grade alloy stands up to saltwater or freshwater with minimal upkeep.
Engine & Gearcase Compatibility
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HP Range: 35 HP (35B through 1984) up to 50 HP (except 50C, 1992 & newer)
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Later Models Covered: BFT60/BFT60A (2014+), 40 HP (1984+), MFS 40 HP (2015+), MFS60A (2019+)
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Gearcase Specs: 3¼″ housing, 13-spline tooth
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Rotation: Right-hand only
Detailed Propeller Lineup
| Blades | Diameter | Pitch | Rotation |
|---|---|---|---|
| 3 | 10 ¼″ | 14″ | R |
| 3 | 10 ¼″ | 15″ | R |
| 3 | 10 ¼″ | 16″ | R |
| 3 | 10 ³⁄₈″ | 13″ | R |
| 3 | 10 ³⁄₈″ | 14″ | R |
| 3 | 10 ½″ | 13″ | R |
| 3 | 10 ¾″ | 12″ | R |
| 3 | 10 ⁷⁄₈″ | 11″ | R |
| 3 | 11″ | 15″ | R |
| 3 | 11 ¹⁄₈″ | 13″ | R |
| 3 | 11 ¼″ | 14″ | R |
| 3 | 11 ¼″ | 15″ | R |
| 3 | 11 ³⁄₈″ | 12″ | R |
| 3 | 11 ³⁄₈″ | 14″ | R |
| 3 | 11 ½″ | 11″ | R |
| 3 | 11 ½″ | 13″ | R |
| 3 | 11 ⁵⁄₈″ | 11″ | R |
| 3 | 11 ⁵⁄₈″ | 12″ | R |
| 3 | 11 ⁵⁄₈″ | 13″ | R |
| 3 | 11 ⁵⁄₈″ | 14″ | R |
| 3 | 12 ¼″ | 9″ | R |
| 4 | 11 ⁵⁄₈″ | 11″ | R |
| 4 | 11 ⁵⁄₈″ | 12″ | R |
Selecting the Right Pitch
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9″–11″: Heavy loads, watersports with passengers, trolling.
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12″–14″: Balanced cruising—quick planing plus stable top-end.
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15″–16″: Solo runs or open-water speed demons.
Blade Count Matters
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Three Blades: Faster hole-shots, lighter feel—perfect for general boating.
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Four Blades: Extra bite under load—ideal if you tow skiers or carry heavy gear.
Pro Tips from the Water
“Switching from a 10¼″×14″ three-blade to an 11 ½″×12″ four-blade on my 40 HP transformed my acceleration and maintained 29 MPH top speed, even with two aboard.”
—Marine mechanic (15+ years’ experience)
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Sea Trial Multiple Pitches. Don’t guess—test at least two options.
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Check Spline Engagement. A snug fit prevents vibration and wear.
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Match Your Load. Heavier gear or tow duties call for extra pitch and blades.
By tailoring blade count, diameter, and pitch to your boat’s weight and mission profile, these stainless steel propellers unlock smoother acceleration, tighter handling, and better fuel efficiency. Ready to optimize your 35–50 HP Tohatsu outboard? Dive into our selection and feel the difference on your very next voyage!