Turning Point Express Mach4 Propeller 14x21 – 4-Blade Stainless Steel, RH Rotation
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You have 30 days to request a return. All sale items are final sale.
4-Blade Dual Geometry Stainless Steel Propeller – Hole Shot, Handling & Load Capacity Without Sacrificing Top Speed
The Express Mach4 14x21 is a 4-blade stainless steel propeller engineered for boats running 90–300+ hp engines with 4.75" gearcases. It solves the classic 4-blade trade-off: most 4-blade props sacrifice top-end speed for better hole shot and handling — the Mach4 doesn’t. Its patented Dual Geometry design uses two distinct blade profiles in a single hub to deliver the acceleration, stern lift, and rough-water stability of a 4-blade, while maintaining top-end speed on par with a comparable 3-blade prop.
Two blades use an aggressive variable-rake geometry for explosive hole shot and sharp cornering. The other two use an offshore-style design for high speed and maximum stern lift. The result is a prop that lifts the entire hull higher out of the water — reducing wetted surface, improving fuel efficiency under load, and keeping speed consistent whether the boat is lightly loaded or packed with passengers and gear.
Built from proprietary TP17™ stainless steel — 20% higher chromium content, ~250% stronger and 5× more durable than standard stainless — with large free-flowing exhaust ports (40% more exhaust area than typical competitors) to reduce backpressure and extract maximum power.
Key Features
- Dual Geometry design — two blade profiles in one hub for 4-blade handling with 3-blade top-end speed
- Unprecedented hole shot, bow lift, and rough-water stability
- Lifts the hull higher under load — maintains speed when fully loaded where a 3-blade can lose up to 3 mph
- Proprietary TP17™ stainless steel — 20% more chromium, ~250% stronger, 5× more durable than standard stainless
- Large free-flowing exhaust ports — 40% more exhaust area for reduced backpressure
- Race-proven finish and tuning from state-of-the-art casting technology
- Right-hand (standard) rotation
- 14" diameter × 21" pitch, 4-blade configuration
Ideal Applications
The Mach4 excels in applications where load carrying, stern lift, and handling matter most: pontoon and tri-toon boats, sterndrive applications, watersports tow boats, bay boats, and any vessel that benefits from consistent performance under varying loads. It’s also an excellent upgrade over older 4- and 5-blade ski props from previous generations.
Engine Compatibility
Fits a wide range of outboard and sterndrive applications including Cox®, Evinrude®, Honda®, Johnson®, Mariner®, Mercury®, MerCruiser®, Nissan®, OMC®, OXE®, Parsun®, Suzuki®, Tohatsu®, Volvo Penta®, and Yamaha® engines. Always verify fitment using the manufacturer’s application chart.
Required Hub Kit
A hub/installation kit is required and sold separately. Use a 500 Series Hub Kit for engines under 200 hp, or the 700 Series Hub Kit for engines 200 hp and above. Refer to the application chart for the correct part number for your engine.
Other Configurations Available
- Express Mach4 14x21 – Left-Hand Rotation (for twin-engine / counter-rotating setups)
- Express Mach4 13x19 – RH Rotation (lower pitch option)
- Express Mach4 14x23 – RH Rotation (higher pitch option)
Parts Desk Insights
Best Use Case: The Mach4 is the right recommendation when a customer needs better hole shot, stern lift, or load-carrying performance than their current 3-blade delivers — without giving up top-end speed. It’s especially strong on pontoons, tri-toons, watersports boats, and heavily loaded bay boats. If a customer is happy with their 3-blade’s top speed but wants better acceleration and handling, this is the upgrade.
3-Blade vs. 4-Blade Guidance: On a lightly loaded boat, a 3-blade (like the Express Mach3 14.25x21) is typically the faster prop. The Mach4 shines when the boat is loaded — it can maintain speed where a 3-blade loses up to 3 mph under full load. Help the customer think about how they actually use their boat.
Pitch Selection: The 21" pitch suits mid-to-high RPM applications. Confirm WOT RPM falls within the engine manufacturer’s recommended range. Step down to the Mach4 13x19 if over-propped, or up to the Mach4 14x23 if the engine is under-propped.
Hub Kit Note: Always confirm the hub kit part number from the application chart — the wrong kit is the most common installation error. The MasterGuard Model 517 is a common fit for many 500 Series applications.
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.