Express Mach3 3-Blade Stainless Steel Propeller – 14.50" x 15" | Right Hand Rotation

Express Mach3 3-Blade Stainless Steel Propeller – 14.50" x 15" | Right Hand Rotation

The Express Mach3 is a high-performance 3-blade stainless steel propeller engineered for 90–300+ hp engines with 4.75" gearcases. Built from proprietary TP17™ stainless steel and shaped with race-proven blade geometry, it delivers maximum top-end speed, sharp acceleration, and precise handling — all in a prop that’s significantly more durable and corrosion-resistant than standard stainless or aluminum alternatives.

The 14.50" x 15" pitch is a lower-pitch, higher-diameter option well suited to high-horsepower applications where hole shot and mid-range torque are priorities alongside top speed.

Key Features

• Proprietary TP17™ stainless steel — 20% higher chromium content than standard stainless for better corrosion resistance and a higher-gloss finish. Nearly 250% stronger and 5x more durable than conventional stainless steel, enabling more aggressive blade geometries.
• Performance-tuned pitch, rake, and exhaust vents — Aggressive cup profiles and optimized rake angles maximize speed and handling. Large free-flowing exhaust ports reduce backpressure for improved horsepower delivery and hole shot.
• Race-proven 3-blade design — Optimized for maximum top-end speed with best-in-class acceleration and cornering for a 3-blade stainless prop.
• Wide engine compatibility — Fits COX®, Evinrude®, Honda®, Johnson®, Mariner®, Mercury®, MerCruiser®, Nissan®, OMC®, OXE®, Parsun®, Suzuki®, Tohatsu®, Volvo Penta®, and Yamaha® outboards and sterndrives.

Specifications

• Diameter x Pitch: 14.50" x 15"
• Blades: 3
• Material: TP17™ Stainless Steel
• Rotation: Right Hand (Standard)
• Gearcase Fit: 4.75"
• Engine Range: 90–300+ hp
• Hub System: 500 Series (under 200 hp) or 700 Series (200+ hp) — sold separately

Hub Kit Required

A MasterGuard installation hub kit is required and sold separately. Use the 500 Series for engines under 200 hp, or the 700 Series for engines 200 hp and above. Refer to the application chart for your specific engine’s required kit number.

• MasterGuard Hub Kit 500 – 500 Series
• MasterGuard Hub Kit 502 – 500 Series
• MasterGuard Hub Kit 506
• MasterGuard Hub Kit 508
• MasterGuard 700 Series Hub Kit – 200+ hp

Compare Models

Looking for a different pitch or blade count in the Mach3 stainless lineup?

• Express Mach3 14.25" x 19" – RH (4.75" Gearcase)
• Express Mach3 14.25" x 19" – LH (4.75" Gearcase)
• Express Mach3 14.25" x 17" – RH
• Express Mach4 15.3" x 13" – 4-Blade Stainless (4.75" Gearcase)
• Express Mach4 14" x 19" – 4-Blade Stainless RH

Parts Desk Insights

Best use case: The Express Mach3 14.50" x 15" is the right recommendation for high-horsepower applications (90–300+ hp) where the customer wants maximum performance from a stainless prop and the lower pitch suits their engine’s RPM range or load profile. The wider 14.50" diameter with a 15" pitch is particularly effective on heavier hulls or high-torque engines that need more blade area to efficiently transfer power at lower pitch. It’s also a strong choice when a customer is upgrading from an OEM aluminum prop and wants a meaningful performance gain — the TP17™ stainless construction and tuned exhaust geometry will outperform most OEM and aftermarket stainless alternatives. If the customer needs more top-end pitch, steer them toward the Mach3 14.25" x 19" or Mach3 14.25" x 17". For improved acceleration and load handling, the Mach4 4-blade is worth considering. Always confirm engine make, model, year, gearcase size, and current RPM at WOT before finalizing a prop recommendation.