Quick Summary
This is a 12 3/4 x 21 aluminum propeller for Mercury Black Max 40-140 HP applications. It is a right-hand rotation, 3-blade propeller with 15 spline teeth, and it is listed as a replacement for Mercury OEM number 48-77348A45.
The stated top-speed recommendation is for boats under 50 MPH. When choosing this type of propeller, the key checks are size, spline count, rotation, and whether the replacement part number matches the setup you are replacing.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Diameter x pitch | 12 3/4 x 21. This is the main sizing specification for the propeller. |
| Rotation | Right-hand (RH) rotation. Rotation must match the application. |
| Spline teeth | 15 spline tooth. The hub connection needs to match the engine setup. |
| Blades | 3 blade. Blade count is part of the propeller configuration. |
| Replacement number | Mercury OEM number 48-77348A45. Match this number when comparing replacement options. |
| Recommended speed | Recommended for boats with top speeds less than 50 MPH. Compare this with how the boat is used. |
What to Compare Before Buying
- Diameter and pitch: The stated size is 12 3/4 x 21. Confirm that this matches the propeller you need.
- Rotation: This model is right-hand (RH). Match the rotation to your current setup.
- Spline count: It uses 15 spline teeth. Check the hub connection on the engine.
- Replacement number: Compare the Mercury OEM number 48-77348A45 if you are replacing an existing propeller.
- Speed range: It is recommended for boats with top speeds less than 50 MPH.
Choosing the Correct Version
This propeller is defined by its 12 3/4 x 21 size, right-hand rotation, 15 spline tooth hub, and Mercury OEM replacement number. Those are the main fields to confirm before choosing an offer, especially if you are replacing an existing propeller rather than starting from scratch.
Before You Decide
Confirm the diameter, pitch, rotation, spline count, and OEM replacement number before you choose an offer. If you are replacing a propeller, match the exact setup on the boat and make sure the stated top-speed recommendation fits your use.
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