Express Mach3 OS Propeller 15.6" x 17 – 3-Blade Stainless Steel, RH Rotation | High-HP Outboards & Sterndrives
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Express Mach3 OS Propeller — 15.6" x 17, 3-Blade Stainless Steel, Right-Hand Rotation
The Express Mach3 OS (Oversized) is a large-diameter 3-blade stainless steel propeller engineered specifically for high-horsepower bay boats, offshore center consoles, and large pontoons and tri-toons. Built from proprietary TP17™ stainless steel with refined cup geometry, improved leading and trailing edges, and an aggressive progressive rake, it delivers exceptional hole shot, impressive bow lift, and class-leading cornering — all in a large-diameter platform that excels in mid-range fuel economy.
Best Use Case
The Mach3 OS in 15.6" x 17 pitch is the mid-range option in the OS lineup — the right choice for high-horsepower bay boats, offshore center consoles, and large tri-toons running moderate-to-heavy loads where you want a balance of hole shot and top-end speed. The 17-pitch works well when your engine reaches its recommended RPM range with a moderate load, and the large 15.6" diameter provides excellent thrust and mid-range fuel economy that standard-diameter props can’t match on heavy or wide-beam hulls. If you need more bow lift or run heavily loaded, step down to the 15-pitch. If your boat runs light and you want maximum top-end speed, step up to the 21-pitch.
Key Features
- Large-Diameter Platform — The oversized 15.6" diameter delivers more thrust per revolution, improving mid-range fuel economy and load-carrying performance compared to standard-diameter props at the same pitch.
- Refined Cup & Blade Geometry — Improved cup, leading and trailing edges, and aggressive progressive rake deliver excellent hole shot, strong bow lift, and precise cornering.
- 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.
- MaxSpeed™ Dyno Balance — Each propeller is dynamically balanced using a proprietary process for smooth, vibration-free operation at all speeds.
- Performance-Tuned Exhaust Vents — Optimized exhaust flow pathways reduce back-pressure and free up horsepower at wide-open throttle.
Specifications
- Part Number: 31511710
- Diameter x Pitch: 15.6" x 17"
- Blades: 3
- Material: TP17™ Stainless Steel
- Rotation: Right-Hand (Standard)
- Hub System: 500-Series hub kit (under 200hp) or 700-Series hub kit (200hp+) required — sold separately
Parts Desk Insights
Hub kit required — not included. This propeller uses either the 500-Series or 700-Series interchangeable hub system depending on your engine’s horsepower. 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 or MasterGuard 700 Series Hub Kit.
The 17-pitch is the mid-range option in the Mach3 OS lineup. Step down to the 15-pitch for maximum bow lift and hole shot on heavier hulls, or step up to the 21-pitch for maximum top-end speed on lighter, faster applications. Browse the full Mach3 OS lineup:
Looking for a standard-diameter Mach3 at this pitch? 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.