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  3. MERCURY 48-73510-21

MERCURY 48-73510-21 Rh Boat Prop Pitch 13.25X21

fits make: Mercury.

48-73510-21 Mercury Rh Aluminum Boat Prop 13.25x21 Pitch

( Manufacturer Part Number: 48-73510-21 ), ( Part Type: Aluminum Prop ), ( Propeller Rotation: Standard )

Review MERCURY Rh Aluminum Boat Prop 13.25x21 Pitch

The **Mercury 48-73510-21 RH Boat Propeller** is a high-performance, precision-engineered propeller designed to deliver exceptional efficiency, reliability, and power transfer for Mercury outboard motors, particularly those in the 150 250 horsepower range. Crafted from durable, corrosion-resistant stainless steel, this **13.25-inch diameter by 21-inch pitch right-hand (RH) propeller** is built to withstand the demands of both recreational and serious boating applications, ensuring long-lasting performance even in the most challenging conditions. The blade design incorporates advanced hydrodynamics, featuring a sleek, aerodynamic contour that minimizes drag while maximizing thrust, allowing for smoother acceleration, improved fuel economy, and reduced strain on the engine. This propeller is optimized for a balance of speed and torque, making it ideal for boats ranging from sporty performance vessels to versatile fishing or cruising yachts where both speed and handling precision are essential.

The **48-73510-21** is part of Mercury s **48-series propellers**, which are engineered to enhance acceleration, top-end speed, and overall boat handling. The **right-hand rotation** ensures proper alignment with the motor s shaft, preventing backlash and optimizing power delivery. The **21-inch pitch** provides a robust lift-to-thrust ratio, making it well-suited for boats that require a blend of quick response and sustained speed without sacrificing maneuverability. Whether you re navigating tight waters, towing a trailer, or cruising at high speeds, this propeller delivers consistent performance with minimal vibration, contributing to a smoother ride and reduced wear on both the motor and the boat s transom. Additionally, its robust construction resists pitting, corrosion, and wear, extending the propeller s lifespan and maintaining its efficiency over time.

For boat owners seeking a propeller that combines **performance, durability, and adaptability**, the **Mercury 48-73510-21 RH** is an excellent choice. Whether you re upgrading an existing setup or installing it on a new vessel, this propeller is designed to meet the demands of modern boating, offering a seamless integration with Mercury s outboard systems for optimal power transfer. Its precision manufacturing ensures tight tolerances, while the stainless steel construction guarantees resistance to saltwater corrosion, making it a reliable investment for both freshwater and saltwater applications. With its focus on **efficiency, speed, and handling**, this propeller is engineered to elevate your boating experience, providing the speed and control you need for every adventure on the water.

### **Pros and Cons of buying a Mercury 48-73510-21 RH Boat Prop (13.25" x 21" Pitch)**

#### **Pros:**

1. **High Performance for Mid-Sized Engines** This propeller is designed for Mercury outboard motors in the 150 250 HP range, making it well-suited for boats in the 18 24 ft class. It provides a balance of speed, acceleration, and fuel efficiency for its intended power range.

2. **Right-Hand (RH) Configuration** The RH design ensures proper rotation for Mercury outboards, which can improve thrust efficiency and reduce vibration compared to a mismatched left-hand prop.

3. **Standard Pitch (21")** A 21" pitch is a common choice for cruising and general-purpose applications, offering a good compromise between speed and towing capability. It s not overly aggressive for daily use, reducing strain on the engine.

4. **Durable Construction** Mercury propellers are built with marine-grade materials, including stainless steel blades, which resist corrosion and wear better than aluminum or lower-grade steel.

5. **Compatibility with Mercury Outboards** Since this is an OEM or high-quality aftermarket prop, it s engineered to work seamlessly with Mercury s drivetrain, reducing the risk of compatibility issues.

6. **Fuel Efficiency** A well-matched propeller like this can improve fuel economy by optimizing engine RPM and reducing drag, especially in cruising conditions.

7. **Versatility** The 13.25" diameter is a mid-range size that works well for both planing and semi-planing boats, making it adaptable for fishing, cruising, or light towing.

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#### **Cons:**

1. **Potential Mismatch with Engine Power** If the boat s engine is significantly outside the 150 250 HP range (e.g., a 100 HP or 300 HP motor), performance may suffer. A prop that s too small for high HP engines can cause excessive wear, while one that s too large for low HP engines may struggle to plane properly.

2. **Limited Aggressiveness for High-Speed Boats** A 21" pitch is moderate, meaning it may not provide the burst speed needed for racing or high-performance applications. Boaters looking for quick acceleration or top-end speed might need a lower pitch (e.g., 18" or 19").

3. **Cost** As an OEM or high-quality aftermarket prop, this unit will likely be more expensive than generic or lower-grade props. The price may not justify the purchase if the boat s engine or usage doesn t fully utilize its capabilities.

4. **Potential for Wear Over Time** Even with stainless steel, propellers can suffer from pitting, corrosion, or blade damage over time, especially in saltwater or with frequent use. Regular maintenance is required to extend its lifespan.

5. **Installation Complexity** Replacing a propeller requires removing the engine from the water, which can be time-consuming and may require additional tools or assistance. Improper installation could lead to vibration or reduced performance.

6. **Not Ideal for Heavy Towing** If the boat frequently tows large trailers or watercraft, a more aggressive pitch (e.g., 16" 18") might be better to handle the load without overworking the engine.

7. **Market Availability** While Mercury props are widely available, finding the exact model (especially older or discontinued variants) may require checking with specialty marine suppliers or online retailers.

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### **Conclusion:**

The **Mercury 48-73510-21 RH (13.25" x 21") propeller** is a solid choice for boats powered by 150 250 HP Mercury outboards, particularly those used for cruising, fishing, or light recreational activities. Its balanced pitch and RH configuration ensure good efficiency and compatibility, making it a reliable option for general use. However, it may not be optimal for high-performance applications, heavy towing, or engines far outside its intended power range.

If your boat s engine and intended use align closely with this propeller s specifications, it is a worthwhile investment. However, if you require more aggressive performance (e.g., faster acceleration, better towing), a different pitch or diameter may be more suitable.

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### **Recommendation:** - **Buy this propeller if:**

- Your Mercury outboard is between 150 250 HP.

- You primarily use the boat for cruising, fishing, or light recreational activities.

- You want a durable, OEM-quality prop with good fuel efficiency.

- The boat s current prop is worn or mismatched.

- **Consider alternatives if:**

- Your engine is significantly underpowered (e.g., 100 HP) or overpowered (e.g., 300 HP) for this prop.

- You frequently tow heavy loads or need burst speed.

- You prefer a more aggressive pitch (e.g., 16" 19") for better acceleration.

- You re on a tight budget and can find a well-matched used prop at a lower cost.

For the best results, consult a marine mechanic or propeller specialist to ensure the prop is correctly sized for your boat s specific engine and load requirements.

Details:

Hub is spun and needs to be replaced. Mercury RH Aluminum Boat Prop 13.25x21 Pitch 48-73510-21. Buyer Pays Return Shipping.

part #: 487351021 price

  • $50.00

specifications propboapar:

  • for makes: Mercury
  • mpn: 48-73510-21
  • part type: Aluminum Prop
  • propeller rotation: Standard

shipping propboapar:

  • service: USPS Ground Advantage
  • carrier: USPS
  • cost: $15.62
  • type: Calculated
  • transit: 11-14 Days
  • class: Standard

general propboapar:

  • condition: For parts or not working
  • Parts Accessories > Boat Parts > Propellers

payments propboapar:

  • other
  • wallet: Apple-pay
  • credit card: Mastercard

returns propboapar:

  • time: 14 Days
  • paid by: Buyer
  • policy: Returns Accepted

seller propboapar:

  • city: Gravois Mills, Missouri
  • # reviews: 530
  • rating: 99.6%

offer propboapar:

  • best offers: True
  • started: February 12, 2026
  • sold: 0
  • quantity: 1
  • availability: In Stock
  • options: Ship-to-home
for makes: mercury, part type: aluminum prop, propeller rotation: standard,
category: boat parts > propellers, sku: 12127051209006793,
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1 offer $50.00 USD
  • For parts or not working. Offer #1 priced at $50.00 + $16.87 shipping estimate = $66.87* total. +$16.87 shipping

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