Express Mach3 Propeller 14.25x19 – 3-Blade Stainless Steel, LH Rotation | 90–300+hp (4.75" Gearcase)

Express Mach3 Propeller — 14.25 x 19, 3-Blade Stainless Steel, Left-Hand Rotation

The Express Mach3 is a premium 3-blade stainless steel propeller built on nearly 40 years of race boat and high-performance prop design expertise. Machined from proprietary TP17™ stainless steel and engineered with aggressive pitch angles, sharp cup profiles, and performance-tuned exhaust vents, it delivers best-in-class top speed, acceleration, and handling for high-horsepower outboards and sterndrives from 90 to 300+hp with 4.75-inch gearcases.

This is the left-hand (counter-rotation) version. For twin-engine setups, pair with the Express Mach3 14.25x19 RH Rotation.

Best Use Case

The Mach3 in 14.25 x 19 pitch is a high-pitch option suited to lighter, faster hulls — performance boats, center consoles, and bay boats running 90–300+hp outboards or sterndrives where top-end speed is the primary goal. The 19-pitch works best when your engine reaches its recommended RPM range easily at wide-open throttle with a light-to-moderate load. In a twin-engine counter-rotating setup, pairing this LH prop with the RH version gives you balanced thrust, reduced torque steer, and improved handling at speed.

Key Features

• TP17™ Proprietary Stainless Steel — Formulated specifically for the Mach3 and Mach4 series. 20% higher chromium content than standard stainless for superior corrosion resistance and a higher-gloss finish. Nearly 250% stronger and 5x more durable than conventional stainless steel alloys.
• Race-Proven Blade Geometry — Aggressive pitch angles, radical blade designs, and sharp cup profiles developed from decades of race boat performance engineering. Delivers maximum speed while maintaining strong acceleration and handling.
• Performance-Tuned Exhaust Vents — Optimized exhaust flow pathways reduce back-pressure and free up horsepower at wide-open throttle.
• Broad Engine Compatibility — Fits COX, Evinrude, Honda, Johnson, Mariner, Mercury, MerCruiser, Nissan, OMC, OXE, Parsun, Suzuki, Tohatsu, Volvo Penta, and Yamaha outboards and sterndrives.

Specifications

• Part Number: 31501922
• Diameter x Pitch: 14.25" x 19"
• Blades: 3
• Material: TP17™ Stainless Steel
• Rotation: Left-Hand (Counter-Rotation)
• Gearcase: 4.75" (large)
• Compatible Engine Range: 90–300+hp outboards & sterndrives
• Hub System: 500-Series hub kit (under 200hp) or 700-Series hub kit (200hp+) required — sold separately

Parts Desk Insights

Hub kit required — not included. This propeller uses either the 500-Series or 700-Series interchangeable hub system depending on your engine’s horsepower. Confirm your engine make, model, and year against the application chart before ordering.

LH rotation — confirm your application. Left-hand rotation props are used on the port side of counter-rotating twin-engine setups, or on specific single-engine applications that call for counter-rotation. If you’re running a single standard outboard, you almost certainly need the RH version: Express Mach3 14.25x19 RH Rotation.

The 19-pitch is a high-pitch option for lighter, faster hulls. If your engine is struggling to reach its recommended RPM range, step down to a 17-pitch. Browse the Mach3 lineup by pitch:

• Express Mach3 14.25 x 17 — 3-Blade SS, RH
• Express Mach3 14.25 x 17 — 3-Blade SS, LH
• Express Mach3 14.25 x 19 — 3-Blade SS, RH
• Express Mach3 14.25 x 21 — 3-Blade SS, RH
• Express Mach3 14.25 x 21 — 3-Blade SS, LH
• Express Mach3 14.25 x 23 — 3-Blade SS, RH

Want 4-blade performance? See the Express Mach4 14 x 19 — 4-Blade SS, RH.