1. Propellers Boat Parts For Sale
  2. sku: 12574538812483891
  3. MERCURY 48-825904A45

MERCURY 48-825904A45 Steel Propeller 21P 4-BLADE

fits model: Marine, Trophy. make: Mercury.

48-825904a45 Mercury Oem Marine Trophy Plus 21p Stainless Steel 4-blade Propeller 48-825904a4

( Manufacturer Part Number: 48-825904A45 ), ( Part Type: Propeller ), ( Pitch: 21p ), ( Country Of Origin: United States )

Review MERCURY Oem Plus 21p Stainless Steel 4-blade Propeller 48-825904a4 fits TROPHY MARINE

The **Mercury 48-825904A45 Marine Trophy 21P Steel 4-Blade 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 **high-grade, corrosion-resistant steel**, this propeller is built to withstand the harshest marine environments, from saltwater corrosion to the constant stress of high-speed operation, ensuring a long service life with minimal maintenance. The **21-pitch** designation indicates an optimized blade design tailored for balanced performance across a range of speeds, making it ideal for both cruising and high-performance applications. Whether you're accelerating quickly off the dock, maintaining top-end speed, or navigating through rough water, this propeller s **4-blade configuration** provides superior thrust and reduced cavitation, reducing strain on the engine while maximizing efficiency.

The **Trophy Series** designation underscores Mercury s commitment to performance, with this propeller featuring a **hydrodynamic blade profile** that minimizes drag and maximizes water displacement, resulting in smoother operation and better fuel economy. The **steel construction** not only enhances durability but also ensures consistent performance over time, resisting warping or deformation that can occur with lower-grade materials. The **precision-machined blades** are designed with a **skew angle** that optimizes water flow, reducing turbulence and improving overall propulsion efficiency. This propeller is particularly well-suited for **fishing boats, speedboats, and performance cruisers**, where both power and fuel efficiency are critical. Whether you're towing a wakeboarder, cruising at high speeds, or navigating through choppy waters, the **48-825904A45** delivers a seamless blend of strength, performance, and longevity, making it a premium choice for serious boaters who demand the best from their marine equipment.

### **Pros and Cons of buying a Mercury 48-825904A45 Marine Trophy 21P Steel 4-Blade Propeller**

#### **Pros:**

1. **High Performance** The 4-blade design is optimized for efficiency, providing better thrust and reduced cavitation compared to 3-blade props. This makes it ideal for high-performance boats, especially those with powerful engines.

2. **Durability** Made from high-quality steel, this propeller is built to withstand the harsh conditions of marine environments, including saltwater corrosion and mechanical stress. It is designed for long-term use without frequent replacements.

3. **Trophy Series Quality** Mercury s Trophy series is known for precision engineering and superior materials, ensuring better performance and longevity than standard propellers.

4. **Compatibility with Mercury Outboards** This propeller is specifically designed for Mercury outboards, ensuring optimal performance and compatibility with the engine s power output.

5. **Reduced Fuel Consumption** The aerodynamic design helps improve fuel efficiency by minimizing drag and optimizing propulsion, which can lead to cost savings over time.

6. **Versatility** The 21-pitch (inches per revolution) is suitable for a range of boat types, including planing boats, cruisers, and performance vessels. It balances speed and handling well.

7. **Easier Installation** Mercury propellers are designed to fit seamlessly with their outboards, reducing installation complexity and ensuring proper alignment.

8. **Resale Value** High-quality propellers like this one can retain value better than generic or lower-grade alternatives, making them a worthwhile investment for boat owners who plan to sell their vessel in the future.

---

#### **Cons:**

1. **Higher Upfront Cost** Compared to standard or aftermarket propellers, this Mercury Trophy series propeller is more expensive. The premium price may not be justified for casual or low-use boats.

2. **Specialized Use Case** While versatile, the 21-pitch may not be ideal for boats requiring extreme low-speed maneuverability (e.g., fishing boats needing fine control) or high-speed racing applications where a different pitch might be better.

3. **Potential for Damage** Like all propellers, this one is vulnerable to damage from debris (e.g., rocks, docks, or fishing line). High-performance props are more expensive to replace if damaged.

4. **Weight** Steel propellers are heavier than aluminum or composite alternatives. This can slightly affect handling, especially on smaller boats where weight distribution is critical.

5. **Maintenance Requirements** While durable, steel propellers require regular cleaning (especially in saltwater) to prevent corrosion and rust, which can degrade performance over time.

6. **Limited Availability of Replacement Parts** If the propeller sustains damage, finding exact replacements (especially for older Mercury models) may be harder than for more common brands.

7. **Overkill for Low-Power Engines** If the boat s engine is underpowered or the vessel is primarily used for leisurely cruising, the performance gains of this propeller may not be noticeable, making the investment unnecessary.

---

### **Conclusion:**

The **Mercury 48-825904A45 Trophy 21P Steel 4-Blade Propeller** is a high-quality, performance-oriented propeller that excels in durability, efficiency, and compatibility with Mercury outboards. It is best suited for **performance boats, cruisers, or vessels where speed, thrust, and longevity are priorities**. However, its **higher cost and specialized nature** make it less ideal for budget-conscious owners, low-power engines, or boats requiring extreme maneuverability.

If you prioritize **reliability, fuel efficiency, and long-term performance** and can justify the investment, this propeller is an excellent choice. For **casual boaters, fishing boats, or those on a tight budget**, a more affordable alternative (e.g., a 3-blade or aluminum propeller) may suffice.

### **Recommendation:**

- **Buy it if:** You own a Mercury-powered boat, prioritize performance and durability, and use your vessel for speed-oriented activities (e.g., cruising, watersports, or light racing).

- **Consider alternatives if:** You have a lower-power engine, need fine low-speed control, or are operating on a tight budget. In such cases, a **3-blade propeller or a different pitch (e.g., 18P or 24P)** might better match your needs.

- **Pair with:** Regular maintenance (cleaning, rust prevention) to maximize its lifespan and performance. Always follow Mercury s installation guidelines to ensure optimal function.

Details:

Polished Stainless Steel Finish. Sold Exactly as Shown. Trophy Plus Performance Propeller. Please review all photos carefully for exact condition and included components.

OEM Mercury Marine Trophy Plus propeller featuring a 4-blade stainless steel design with 21 pitch 21P. No major cracks, chips, or visible structural damage noted. Normal cosmetic wear consistent with Marine use and storage. Components included are exactly as shown in photos.

Condition Notes: Good used condition. Performance Marine Propeller. Part Number: 48-825904A45. Mercury Marine Trophy Plus Stainless Steel 4-Blade Propeller high-performance stainless steel propeller designed for outboard and stern drive applications.

Please verify fitment before purchase. Hub appears solid and usable. Light scratches, scuffs, and minor blemishes visible throughout. Includes solid hub assembly and polished stainless steel construction exactly as shown in the photos.

Highlights: OEM Mercury Marine. Blades appear straight overall.

part #: 48825904a45 price

  • $349.00

specifications propboapar:

  • for models: Marine, Trophy
  • for makes: Mercury
  • mpn: 48-825904a45
  • part type: Propeller
  • pitch: 21p
  • country of origin: United States

payments propboapar:

  • money order
  • other
  • cash
  • wallet: Google-pay
  • credit card: Diners-club
  • check

shipping propboapar:

  • service: UPS Ground
  • class: Standard
  • cost: $200.00
  • carrier: UPS
  • transit: 5-12 Days
  • type: Fixed

seller propboapar:

  • city: Alvin, Texas
  • rating: 99.0%
  • # reviews: 1821

offer propboapar:

  • sold: 0
  • started: May 27, 2026
  • options: Ship-to-home
  • quantity: 1
  • best offers: True
  • availability: In Stock

general propboapar:

  • condition: Used
  • Parts Accessories > Boat Parts > Propellers

returns propboapar:

  • policy: No Returns
for models: marine, trophy, for makes: mercury, part type: propeller, pitch: 21p, country of origin: united states,
category: boat parts > propellers, sku: 12574538812483891,
Mercury 48-825904A45 Is Similar To:
propboapar logo
1 offer $349.00 USD
  • Used. Offer #1 priced at $349.00 + $200.00 shipping estimate = $549.00* total. 4-Blade Stainless Steel Design. Includes solid hub assembly and polished stainless steel construction exactly as shown in the photos.+$200.00 shipping

Copyright © propboapar.com