The Turning Point Express Mach3 OS (OS-1627) is a 3-blade, 15.6" x 27" pitch stainless steel propeller engineered for high-horsepower outboard and sterndrive applications. Built on the success of Turning Point's popular VO series, the Mach3 OS incorporates refined cup geometry, improved leading and trailing edges, and an aggressive progressive rake design — hallmarks of the Turning Point engineering philosophy. The result is a propeller that delivers outstanding hole shot, impressive bow lift, and class-leading cornering performance.
Crafted from Turning Point's proprietary TP17™ stainless steel alloy, the Mach3 OS offers a significant material advantage over standard stainless steel propellers. TP17™ features 20% higher chromium content for enhanced corrosion resistance and a higher-gloss finish, while delivering approximately 250% greater strength and 5x the durability of conventional stainless steel. This advanced alloy gives Turning Point's designers the freedom to execute aggressive blade geometries that standard materials cannot support.
Large Free-Flowing Exhaust Ports: The Mach3 OS housing features oversized exhaust flow pathways with approximately 40% more exhaust flow area compared to competing designs. Reduced backpressure translates directly into more available horsepower — the prop equivalent of performance headers for your engine.
Key Features:
- Model: Express Mach3 OS — OS-1627 | MPN: 31512710
- Size: 15.6" diameter x 27" pitch
- Blades: 3-blade configuration, right-hand (standard) rotation
- Material: Proprietary TP17™ stainless steel — 20% higher chromium content, ~250% stronger than standard stainless
- Gearcase: Fits 4.75" gearcase outboards, 90hp and larger
- Sterndrive Compatibility: Mercury® Alpha One™, Bravo One™, and Volvo® Penta® SX
- Performance: Excellent hole shot, bow lift, and cornering; optimized for large-horsepower bay boats, offshore center consoles, and high-horsepower pontoons/tri-toons
- Fuel Economy: Large-diameter 3-blade design promotes strong mid-range fuel efficiency
- Exhaust Design: Oversized exhaust ports with ~40% greater flow area reduce backpressure for more power
- Hub Kits: Requires 500 Series MasterGuard hub kit (under 200hp) or 700 Series hub kit (200hp+) — sold separately
- Compatible Brands: COX®, Evinrude®, Honda®, Johnson®, Mariner®, Mercury®, MerCruiser®, Nissan®, OMC®, OXE®, Parsun®, Suzuki®, Tohatsu®, Volvo Penta®, and Yamaha®
Whether you're looking to maximize speed, improve handling, or extend your cruising range, the Express Mach3 OS is engineered to get the most performance out of your high-horsepower boat. See the application chart for specific engine fitment details and required hub kit part numbers.
