Turning Point Express Mach3 OS - Left Hand - Stainless Steel Propeller - OS-1621-L - 3-Blade - 15.6" x 21 Pitch

The Express® Mach3™ OS™ Left Hand Stainless Steel Propeller is engineered to elevate your boating experience. With a robust 15.6" diameter and a 21 pitch, this 3-blade propeller delivers unmatched performance, ensuring optimal speed, fuel efficiency, and durability for a variety of high-horsepower marine applications.

Unmatched Performance and Handling

The Express® Mach3™ OS™ Series represents the latest advancement in stainless steel propeller technology. Our team of engineers and propeller experts have refined the cup design, leading and trailing edges, and implemented an aggressive progressive rake alongside innovative blade geometry—hallmarks of Turning Point’s commitment to excellence. These enhancements result in superior hole shot, impressive bow lift, and industry-leading cornering capabilities.

Superior Material and Durability

Proprietary Stainless Steel, TP17™

Crafted from Turning Point’s exclusive TP17™ stainless steel, the Mach3™ OS™ propeller boasts:

• 20% higher chromium content for enhanced shine and corrosion resistance compared to standard stainless steel.
• Approximately 250% greater strength and five times the durability, ensuring longevity even in the harshest marine environments.

This advanced material allows for radical design innovations, enabling you to maximize your boat’s performance and reliability.

Enhanced Exhaust Flow

Large Free Flowing Exhaust Ports

The Express Mach3 OS™ features Turning Point’s optimized propeller housings with expansive exhaust flow pathways, providing:

• 40% more exhaust flow area than competing products.
• Reduced backpressure, which can contribute to increased horsepower and improved overall engine performance—akin to installing high-performance headers on your boat.

Versatile Compatibility

Designed to fit a wide range of engines, the Express Mach3 OS™ is compatible with:

• All 90hp and larger 4.75" gearcase outboards from manufacturers such as Evinrude®, Force®, Honda®, Johnson®, Mariner®, Mercruiser®, Mercury®, Nissan®, OMC®, Parsun®, Suzuki®, Tohatsu®, Volvo® Penta®, and Yamaha®.
• Mercury® Alpha One™ and Bravo One™, and Volvo® Penta® SX sterndrive systems.

Available in multiple configurations, including 3 and 4 blade options, left and right rotation models, and a variety of diameter and pitch sizes to suit nearly all boat types and boating requirements.

Installation and Support

Easy Installation with Lifetime Warranty MasterGuard Kits

Choose from our Lifetime Warranty MasterGuard Installation Kits tailored to fit your specific engine model. Additionally, a Hub Kit is required for installation of this propeller. Refer to the Quick Guide (PDF) or use the Prop Wizard™ for selecting the appropriate hub kit.

Specifications

Feature	Details
Diameter	15.6 inches
Material	Stainless Steel (TP17™)
Pitch	21
Rotation	Left Hand
Box Dimensions	8"H x 16"W x 16"L
Weight	17.85 lbs
UPC	652480206542

Additional Resources

Quick Guide (PDF) | Brochure (PDF)

Watch Our Propeller in Action

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit P65Warnings.ca.gov.

Orders of physical products placed by 3 PM EST M-F typically ships the same day, if all requested items are in stock. Weekend orders will typically ship on Monday.

Shipping takes 2-7 days.

We currently ship to the Contiguous 48 States.

Life of Sailing merch is custom made for the customer after an order is placed. Total turnaround is typically 7-14 days from order to doorstep.