YOUNG PROPS 13x19 Boat Propeller for Mercury 40–140HP 4.25" Gearcase — 3‑Blade Alloy with Hub Kit

A durable 13" x 19" three-blade aluminum propeller from YOUNG PROPS designed to replace Mercury OEM 48-77346A45 on 40–140HP outboards.

This propeller is built as a direct-fit replacement for Mercury 40–140HP outboard engines with a 4.25" gearcase, offering a balanced mix of acceleration, top speed, and fuel efficiency. Manufactured from alloy-aluminum with a right-hand rotation and a 15-tooth spline hub, it includes a complete hub kit and hardware so you can install it without sourcing extra parts. The design focuses on durability and consistent performance for recreational boating and fishing enthusiasts who want a reliable spare or replacement.

How does this propeller perform compared with the original Mercury unit?

The YOUNG PROPS 13x19 propeller is engineered to mimic OEM fit and function while using robust alloy-aluminum for long service life. You can expect near-original acceleration and cruising characteristics, with attention to minimizing engine strain and fuel consumption when matched correctly to your boat.

• Diameter 13" and pitch 19" tuned for a balance of speed and low-end pull.
• Three-blade profile for stable handling and solid thrust.
• Alloy-aluminum construction for lightweight durability and corrosion resistance.
• 15-tooth spline and right-hand rotation ensure direct compatibility with specified Mercury gearcases.

What hardware and parts are included for installation?

This propeller ships with a full interchangeable hub kit and mounting hardware, so you have the components needed to install it without guessing which parts to buy. The included pieces support proper engagement with your engine’s driveshaft and provide a secure fit.

• Forward thrust washer to position the propeller correctly on the shaft.
• Drive sleeve for secure connection to the gearbox splines.
• Aft adaptor and tab washer to lock the assembly in place.
• Propeller nut included; ready for torquing to manufacturer specs.

Which Mercury engines and situations is this propeller suitable for?

This YOUNG PROPS model replaces OEM part number 48-77346A45 and is intended for Mercury outboard engines rated from 40HP up to 140HP with a 4.25" gearcase. It’s suitable as a direct replacement or backup propeller for everyday boating, fishing trips, and recreational watersports where a reliable mid-range pitch is desirable.

• Compatible with Mercury 40–140HP outboards using a 4.25" gearcase.
• Right-hand rotation installations only.
• Good choice as a spare or original-equivalent replacement for outings and rentals.
• Best for boats where a 13" diameter and 19" pitch meet performance needs.

What quality protections and warranty coverage come with the propeller?

YOUNG PROPS emphasizes quality control during manufacturing and supplies a 12-month replacement warranty covering blade fractures and hub slipping under normal use. Standard exclusions apply, such as damage from collisions, improper installation, unauthorized modifications, or normal wear.

• Strict quality control during production to improve durability.
• 12-month replacement for blade fractures and bush slipping (limited conditions).
• Exclusions include accidental damage, misuse, or modification.
• Customer support available for fitment questions and claims.

Who is this for: Boaters and anglers who need a reliable, OEM-compatible spare or replacement propeller for Mercury 40–140HP outboards with a 4.25" gearcase. It suits owners seeking a strong, all-purpose three-blade aluminum prop that balances acceleration and cruising efficiency, and who want the convenience of a full hub kit included for straightforward installation.