Express Mach3 Propeller 13.25x17 – 3-Blade Stainless Steel, RH Rotation | 40–150hp (4.25" Gearcase)
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You have 30 days to request a return. All sale items are final sale.
Express Mach3 Propeller — 13.25 x 17, 3-Blade Stainless Steel, Right-Hand Rotation
The Express Mach3 is a premium 3-blade stainless steel propeller built on race-proven blade geometry and manufactured from proprietary TP17™ stainless steel. With performance-tuned pitch angles, exhaust vents, and a high-gloss corrosion-resistant finish, it delivers best-in-class top speed, acceleration, and handling for mid-range outboards and sterndrives from 40 to 150hp with 4.25-inch gearcases.
Best Use Case
The Mach3 in 13.25 x 17 pitch is a mid-to-high pitch option for 40–150hp outboards and sterndrives with 4.25" gearcases, delivering strong top-end speed with good all-around performance. It’s well-suited to lighter hulls — center consoles, bay boats, and runabouts — running moderate loads where the engine reaches its recommended RPM range easily at wide-open throttle. It’s an excellent upgrade over OEM aluminum props and older-generation stainless designs, delivering meaningful gains in speed, fuel economy, and handling.
Key Features
- TP17™ Proprietary Stainless Steel — 20% higher chromium content than standard stainless for superior corrosion resistance and a higher-gloss finish. Nearly 250% stronger and 5x more durable than conventional stainless steel alloys.
- Race-Proven Blade Geometry — Performance-tuned pitch angles and rake deliver maximum speed while maintaining strong acceleration and handling.
- Performance-Tuned Exhaust Vents — Optimized exhaust flow pathways reduce back-pressure and free up horsepower at wide-open throttle.
- Broad Engine Compatibility — Fits Evinrude, Honda, Johnson, Mariner, Mercury, MerCruiser, Nissan, OMC, Parsun, Suzuki, Tohatsu, and Yamaha outboards and sterndrives.
Specifications
- Part Number: 31431712
- Diameter x Pitch: 13.25" x 17"
- Blades: 3
- Material: TP17™ Stainless Steel
- Rotation: Right-Hand (Standard)
- Gearcase: 4.25" (mid-large)
- Compatible Engine Range: 40–150hp outboards & sterndrives
- Hub System: 500-Series hub kit required (sold separately)
Parts Desk Insights
Hub kit required — not included. This propeller uses the 500-Series interchangeable hub system. Confirm your engine make, model, and year against the application chart to select the correct kit before ordering. See the MasterGuard Kit 500 — 500 Series.
4.25" gearcase — verify your engine. This is the mid-large gearcase Mach3, designed for 40–150hp engines. It is a different gearcase family from the large 4.75" gearcase Mach3s designed for 90–300+hp engines. Confirm your gearcase size before ordering.
The 17-pitch is a mid-to-high pitch option for this gearcase family. If your engine is struggling to reach its recommended RPM range, step down to a 15-pitch for more bite. Browse the Mach3 lineup for this gearcase:
- Express Mach3 13.75 x 15 — 3-Blade SS, RH (4.25" Gearcase)
- Express Mach4 13 x 19 — 4-Blade SS, RH (4.25" Gearcase)
Want 4-blade performance at this pitch? See the Express Mach4 13.25 x 17 — 4-Blade SS, RH. For the larger 4.75" gearcase Mach3 series, see the Express Mach3 14.25 x 17 — 3-Blade SS, RH.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.