The Turning Point Express Mach3 OS (MPN: 31512720) is a 15.6" diameter x 27" pitch, 3-blade stainless steel boat propeller with left-hand rotation. Built on the success of Turning Point's larger-diameter VO series, the Express Mach3 OS delivers refined engineering and performance-focused design for high-horsepower marine applications. This propeller uses Turning Point's standard 2-piece system, consisting of the propeller housing and a separately purchased application-specific hub kit.
Turning Point engineers refined the cup, leading and trailing edges, and progressive rake and blade geometry to produce a propeller with superior holeshot, impressive bow lift, and class-leading cornering performance. The large-diameter 3-blade design also delivers strong mid-range fuel efficiency, making it a well-rounded choice for both performance and economy.
Proprietary TP17™ Stainless Steel:
The Express Mach3 OS is constructed from Turning Point's exclusive TP17™ stainless steel alloy, engineered specifically for the Mach3 and Mach4 propeller lines. TP17™ features 20% higher chromium content than standard stainless steel, delivering enhanced corrosion resistance and a higher-gloss finish. The alloy is nearly 250% stronger and 5x more durable than conventional stainless steel, giving Turning Point's engineers the freedom to execute aggressive, performance-oriented blade geometries.
Large Free-Flowing Exhaust Ports:
The Express Mach3 OS housing features oversized exhaust flow pathways — approximately 40% more exhaust flow area than competing designs. Reduced backpressure translates directly into more usable horsepower, functioning much like performance headers on an automotive engine.
Key Features:
- 15.6" diameter x 27" pitch — 3-blade stainless steel, left-hand rotation
- Engineered for 150–300+ hp engines with 4.75" gearcases
- Fits 90 hp and larger outboards from all major manufacturers, including Mercury® Alpha One™, Bravo One™, and Volvo® Penta® SX sterndrives
- Compatible with COX®, Evinrude®, Honda®, Johnson®, Mariner®, Mercury®, MerCruiser®, Nissan®, OMC®, OXE®, Parsun®, Suzuki®, Tohatsu®, Volvo Penta®, and Yamaha® outboards and sterndrives
- Proprietary TP17™ stainless steel: 20% more chromium, ~250% stronger, 5x more durable than standard stainless
- 40% more exhaust flow area for reduced backpressure and increased horsepower
- Excellent holeshot, bow lift, and cornering performance
- Large-diameter 3-blade design optimized for mid-range fuel efficiency
- Ideal for high-horsepower bay boats, offshore center consoles, and pontoons/tri-toons
- 2-piece design: propeller housing + separately sold 500-series hub kit (engines under 200 hp) or 700-series hub kit (engines 200+ hp)
- Compatible with Mercury® Flo-Torq II®, Michigan Wheel® XHS®, and Solas® Rubex™ hub systems
The Express Mach3 OS is the ideal upgrade for boaters seeking to maximize performance, improve handling, and maintain strong fuel economy — all in one stainless steel propeller built to last.
