MERCURY Outboard Pitch Propeller Spline Prop 1/2X7 48-819338A40

( Manufacturer Part Number: 819338A40 ), ( Part Type: Aluminum Propeller Prop )

Review MERCURY Outboard 1/2x7 Pitch Aluminum Propeller Spline Prop fits 2010–2014

The **Mercury 819338A40 Outboard Propeller** is a high-performance, precision-engineered marine propeller designed specifically for Mercury outboard motors, offering an optimal balance of efficiency, durability, and performance for both recreational and competitive boating applications. This **10 -inch diameter by 7-pitch** propeller features a **14-spline shaft connection**, ensuring a secure and vibration-dampening fit that maximizes power transfer from the engine to the water while minimizing stress on the drivetrain. Crafted from high-grade, corrosion-resistant materials, this propeller is built to withstand the demands of frequent use, harsh saltwater environments, and high-speed operation, making it an ideal choice for everything from daily fishing excursions to high-performance speedboats and wakeboard rigs. The **A40 blade design** is engineered to optimize thrust and efficiency across a wide range of RPMs, delivering superior acceleration, better fuel economy, and reduced cavitation key advantages for anglers seeking quick launches, skiers looking for consistent planing speeds, or racers aiming for edge-to-edge performance. With its **balanced, hydrodynamically shaped blades**, this propeller minimizes noise and vibration, enhancing both comfort for passengers and longevity for the outboard motor. Whether paired with a Mercury Verado, FourStroke, or Sterling engine, the **819338A40** is a versatile upgrade that enhances handling, responsiveness, and overall boating experience, proving that Mercury s attention to detail in propeller design translates directly into measurable performance gains on the water.

### **Pros and Cons of buying a Mercury 819338A40 Outboard Propeller (10.5" x 7 Pitch, 14 Spline, 48-819338A40)**

1. **Compatibility with Mercury Outboards** This propeller is specifically designed for Mercury outboards, ensuring proper fitment and performance optimization for engines in the same series (likely 50 200 HP, depending on the model year and trim). Using the correct propeller improves throttle response, fuel efficiency, and overall handling.

2. **Balanced Performance for Cruising and Light Planing** The **10.5" diameter** and **7-pitch** combination is well-suited for mid-sized boats (e.g., 16 22 feet) that spend time cruising at moderate speeds rather than high-speed planing. This setup reduces strain on the engine while maintaining decent speed.

3. **Durability and Corrosion Resistance** Mercury propellers are typically made from high-quality stainless steel or aluminum alloys, depending on the model. The **14-spline shaft** is a standard size for many Mercury outboards, indicating reliability and ease of maintenance. Properly cared for, this propeller can last for years.

4. **Ease of Replacement and Maintenance** Mercury propellers are widely available from dealers and online retailers, making replacements straightforward. The **48-series** designation suggests it s a common, well-supported part with readily available replacement blades if damaged.

5. **Fuel Efficiency** A properly sized propeller (like this one) reduces unnecessary strain on the engine, leading to better fuel economy compared to an oversized or undersized prop. This is particularly useful for daily cruising or fishing trips where efficiency matters.

6. **Versatility for Different Loads** The **7-pitch** is moderate enough to handle light to moderate loads (e.g., a small boat with passengers or light gear). If the boat is often lightly loaded, this prop will perform well without excessive wear.

7. **Warranty Coverage** New Mercury propellers typically come with a manufacturer s warranty, providing peace of mind against defects in materials or workmanship.

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1. **Potential Mismatch with Engine/Boat Setup** If the boat s current propeller is significantly different (e.g., a high-performance racing prop or a deep-V cruising prop), swapping to this **10.5" x 7-pitch** could result in:

- **Poor acceleration** (if the engine is tuned for a faster prop).

- **Excessive strain** (if the boat is heavily loaded or the engine is underpowered).

- **Reduced top speed** (since 7-pitch is not aggressive for high-speed planing).

*Always verify the propeller s compatibility with the engine s RPM range and the boat s displacement.*

2. **Limited High-Speed Performance** A **7-pitch** propeller is not optimized for high-speed planing. If the boat frequently exceeds **20 25 mph**, the propeller may struggle to keep up, leading to:

- **Engine strain** (the engine may rev higher than ideal).

- **Reduced efficiency** (more fuel consumption at higher speeds).

For high-performance boats, a **lower pitch (e.g., 5 6)** would be better.

3. **Potential for Cavitation or Ventilation** If the boat has a **deep-V hull** or is heavily loaded, the **10.5" diameter** might not provide enough lift, causing the propeller to "ventilate" (lose water flow) at higher speeds. This can lead to:

- **Loss of power** and a "chugging" sound.

- **Accelerated wear** on the propeller blades.

*Testing in water is recommended to check for these issues.*

4. **Cost Relative to Alternatives** While not excessively expensive, this propeller may be more costly than generic or aftermarket options. If the boat is older or lower-end, a slightly smaller or different pitch might suffice without sacrificing performance.

5. **Risk of Damage from Foreign Objects** Propellers are prone to damage from debris (e.g., rocks, fishing line, or marine growth). If the boat is used in shallow or weedy waters, the blades may require more frequent inspections.

6. **Installation Challenges** If the boat s current propeller is **welded or non-standard**, removing and installing this one may require professional help, adding to the cost.

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### **Conclusion and Recommendation**

The **Mercury 819338A40 (10.5" x 7-pitch, 14-spline)** is a **solid, reliable choice** for boats that primarily operate at **moderate speeds (15 25 mph)** with **light to moderate loads**. It strikes a balance between **fuel efficiency, ease of use, and compatibility** with Mercury outboards, making it a practical option for cruising, fishing, or general boating.

You have a **Mercury outboard** (likely 50 200 HP, depending on model year).

Your boat is **16 22 feet** and used for **daily cruising, fishing, or light planing**.

You want a **durable, widely available** propeller with good warranty support.

The current propeller is **worn, damaged, or incorrectly sized** for your boating style.

If your boat **frequently exceeds 25 mph** (consider a **lower pitch, e.g., 5 6**).

If the boat is **heavily loaded** (a **higher pitch, e.g., 8 9** may be better).

If you need **maximum speed and performance** (a **racing or high-performance prop** may be necessary).

If your budget allows, a **custom-machined propeller** could optimize performance further.

- Your boat s current setup is underperforming or the prop is damaged.

- You primarily cruise at **moderate speeds** and don t need extreme speed.

- You want a **reliable, factory-supported** part with good availability.

- Your engine is **high-performance** (e.g., 200 HP) and needs a **lower pitch** for planing.

- Your boat is **heavily loaded** or used in **deep-V applications** where a different pitch would be better.

- You re unsure about the **engine s RPM range** and could end up with poor acceleration or fuel efficiency.

1. **Check your engine s recommended propeller size** in the owner s manual.

2. **Test the current propeller** to see if it s the right size (e.g., does it struggle to keep up at higher speeds?).

3. **Consult a marine mechanic or dealer** if you re unsure about compatibility.

4. **Consider a used/refurbished option** if the boat is older and you want to save money.

This propeller is a **safe, practical choice** for most Mercury outboards in the right application, but **always match it to your specific boating needs** to avoid performance issues.

Details:

This will arrive in the same condition as photos.

part #: 819338a40 prices

• $39.99-$65.00

specifications ouboaen:

• for makes: Mercury
• for years: 2010-2014
• mpn: 819338a40
• part type: Aluminum Propeller Prop

payments ouboaen:

• other
• credit card: Mastercard
• wallet: Paypal

returns ouboaen:

• time: 30 Days
• policy: Returns Accepted
• paid by: Buyer

general ouboaen:

• Boat Parts > Outboard Engines Components > Other
• condition: Used

seller ouboaen:

• # reviews: 172
• city: Saint Elmo, Illinois
• rating: 100.0%

shipping ouboaen:

• service: USPS Ground Advantage
• carrier: USPS
• cost: $0.00
• type: Fixed
• transit: 5-11 Days
• class: Standard

offer ouboaen:

• availability: In Stock
• options: Ship-to-home
• sold: 0
• started: March 8, 2026
• quantity: 1

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