1. Propellers Boat Parts For Sale
  2. sku: 12363057176558983
  3. MERCURY 42733A45P8

MERCURY 42733A45P8 Propeller Prop Rh Propeller/prop 1/5

fits make: Mercury. year: 2012.

42733a45p8 Mercury Propeller/prop 12 1/5 X 8 Rh

( Manufacturer Part Number: 42733A45P8 ), ( Part Type: Propeller Prop ), ( Warranty: 30 Day )

Review MERCURY Propeller/prop 1/5 Rh fits 2012

The **Mercury 42733A45P8 Propeller** is a high-performance, precision-engineered marine propeller designed specifically for Mercury outboard motors, particularly those in the 150 250 horsepower range, including the iconic Verado and FourStroke series. This **12-inch, 12/5 pitch** propeller features a **5-bladed, fixed-pitch design** optimized for maximum efficiency, fuel savings, and smooth operation across a wide range of speeds and loads. Crafted from **high-grade, corrosion-resistant aluminum alloy**, the propeller is built to withstand the harshest marine environments, from saltwater corrosion to the constant stress of high-speed cruising and heavy-duty towing. Its **hydrodynamic blade shape** ensures reduced cavitation, minimizing noise and vibration while enhancing thrust and acceleration, making it ideal for both performance boats and versatile recreational vessels.

The **P8 designation** indicates a performance-oriented pitch, balancing speed and torque for optimal power delivery, whether you're accelerating quickly off the dock or maintaining steady cruising speeds. The **5-bladed configuration** provides a fine balance between efficiency and smoothness, reducing drag while maintaining strong pulling power perfect for boats that demand both speed and handling precision. This propeller is particularly well-suited for applications where fuel economy is a priority, as its aerodynamic design minimizes water resistance, allowing the engine to operate more efficiently. Additionally, its **precision-machined blades** and **balanced construction** contribute to a quieter ride, reducing fatigue for both the driver and passengers.

For boat owners seeking a reliable, long-lasting propeller that delivers both performance and durability, the **Mercury 42733A45P8** stands out as a premium choice. Whether installed on a high-performance speedboat, a family fishing vessel, or a versatile wakeboard rig, this propeller ensures consistent performance, reduced wear on the engine, and an overall smoother boating experience. With its **OEM compatibility** and **engineered specifications**, it seamlessly integrates with Mercury s advanced outboard systems, providing the confidence of a trusted brand known for innovation and quality in marine propulsion.

The **Mercury 42733A45P8 propeller** (also referred to as a **Prop 12 1/5 RH**) is a popular choice for outboard motors, particularly those in the 90 250 HP range. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Mercury 42733A45P8 Propeller**

1. **High Performance in Planing Boats**

The Prop 12 1/5 RH is designed for **high-speed planing applications**, making it ideal for boats like center console, bowriders, and performance cruisers. It excels in **acceleration, top-end speed, and fuel efficiency** once the boat is fully planing.

2. **Durability and Reliability**

Mercury propellers are built to withstand **heavy loads and rough conditions**. The **stainless steel construction** resists corrosion, and the **robust blade design** minimizes the risk of bending or damage from debris.

3. **Wide Compatibility**

This propeller is **universally compatible** with most **Mercury outboards in the 90 250 HP range**, including models like the **9.9, 115, 150, 200, and 250 HP** series. It works well with **2- and 3-blade configurations** on many motors.

4. **Good for Deep-V and Planing Hulls**

The **12.5-inch diameter and 5-inch pitch** make it well-suited for **deep-V hulls** and **planing boats**, where it provides **strong thrust and smooth operation** at higher speeds.

5. **Ease of Installation**

Mercury propellers are **standardized**, meaning they fit most motors without modification. Replacement is straightforward, and many dealers carry them in stock.

6. **Fuel Efficiency at Cruise Speeds**

Once the boat is planing, this propeller helps **reduce fuel consumption** by maintaining efficiency at sustained speeds.

7. **Minimal Cavitation at Higher Speeds**

Compared to smaller or lower-pitch props, the **12.5-inch diameter** reduces cavitation, allowing the motor to **retain power at higher RPMs** without losing efficiency.

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### **Cons of the Mercury 42733A45P8 Propeller**

1. **Not Ideal for Slow or Trolling Speeds**

The **5-inch pitch** is optimized for **planing speeds (20 mph)**, meaning it **struggles at slow speeds (under 10 mph)**. This can result in **poor acceleration from a stop** and **higher RPMs at low speeds**, which may reduce fuel efficiency in that range.

2. **Potential for Excessive RPM at Low Loads**

If the boat is **underpowered or heavily loaded**, the propeller may **spin too fast at slow speeds**, leading to **higher fuel consumption** and **potential overheating** of the motor.

3. **Limited Use in Shallow Water**

The **larger diameter (12.5 inches)** means it may **drag in shallow water**, reducing efficiency or even damaging the propeller if run aground.

4. **Higher Cost Compared to Smaller Props**

While not excessively expensive, it is **more costly than smaller, lower-pitch propellers** (e.g., a Prop 10 or Prop 11). If a boat rarely reaches planing speeds, a smaller prop might be a better investment.

5. **Sensitivity to Debris**

Like all propellers, this one is **vulnerable to damage from rocks, fishing line, or other debris**. The **stainless steel construction helps**, but improper handling can still cause bending or pitting.

6. **May Require Adjustment for Different Boat Setups**

If the boat has **heavy gear, a large wake, or a less efficient hull**, the Prop 12 1/5 RH might **not perform as well as a custom-propeller setup** (e.g., a **4-blade or variable-pitch prop**).

7. **Not Suitable for Deep-V in Very Light Loads**

Some **deep-V boats with heavy loads** (e.g., fishing boats with live wells) may benefit from a **higher-pitch prop (e.g., Prop 13 or 14)** for better low-speed performance.

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### **Conclusion**

The **Mercury 42733A45P8 Prop 12 1/5 RH** is an **excellent choice for boats that primarily operate at planing speeds (20 mph)**, particularly **center consoles, performance cruisers, and deep-V hulls**. Its **durability, high-speed efficiency, and broad compatibility** make it a **reliable standard option** for many outboard applications.

However, if the boat **frequently operates at slow speeds, in shallow water, or under heavy loads**, a **different pitch or diameter** (e.g., Prop 11 for better low-speed performance or a Prop 13 for cruising efficiency) might be more suitable. Additionally, **boats with heavy gear or custom setups** may benefit from a **custom propeller** for optimized performance.

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### **Recommendation**

- **Buy the Mercury 42733A45P8 Prop 12 1/5 RH if:**

- Your boat is a **planing hull (bowrider, center console, sportfisher)**.

- You **primarily cruise at 20 mph** and need **high-speed efficiency**.

- You want a **durable, off-the-shelf solution** that fits standard Mercury outboards.

- Your boat **does not frequently operate at slow speeds** (under 10 mph).

- **Consider an alternative if:**

- Your boat **mostly operates at slow speeds** (e.g., a fishing boat with a live well).

- You **frequently run in shallow water** (a smaller diameter prop may be better).

- You have a **heavily loaded or custom boat setup** (a **custom propeller or higher-pitch prop** could improve performance).

- You want **better fuel efficiency at cruise speeds** (a Prop 13 or 14 might be more suitable).

**Final Verdict:** For **standard planing boats in the 90 250 HP range**, this propeller is a **solid, cost-effective choice**. However, **customizing the pitch or diameter** based on your specific boat and usage will yield better long-term results. If unsure, consult a **Mercury dealer or propeller specialist** for a **propeller matching service** to ensure optimal performance.

Details:

Mercury Propeller/Prop 12 1/2 X 8 Black Aluminum 13 Spline RH Right Hand Rotation Part# 42733A45P8 Please see photos for condition or dings.

part #: 42733a45p8 price

  • $69.98

specifications propboapar:

  • for makes: Mercury
  • for years: 2012
  • mpn: 42733a45p8
  • part type: Propeller Prop
  • warranty: 30 Day

seller propboapar:

  • # reviews: 93
  • rating: 100.0%
  • city: Spanish Fort, Alabama

general propboapar:

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

offer propboapar:

  • options: Ship-to-home
  • availability: In Stock
  • quantity: 1
  • started: April 6, 2026
  • sold: 0
  • best offers: True

shipping propboapar:

  • transit: 4-11 Days
  • carrier: UPS
  • type: Calculated
  • class: Economy
  • service: UPS Ground Saver
  • cost: $11.65

payments propboapar:

  • other
  • credit card: Visa
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returns propboapar:

  • policy: Returns Accepted
  • paid by: Buyer
  • time: 30 Days
for makes: mercury, for years: 2012, part type: propeller prop, warranty: 30 day,
category: boat parts > propellers, sku: 12363057176558983,
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1 offer $69.98 USD
  • Used. Offer #1 priced at $69.98 + $11.65 shipping estimate = $81.63* total. P0068 Mercury Propeller/Prop 12 1/2 X 8 Black Aluminum 13 Spline RH- Right Hand Rotation Part# Please see photos for condition or dings.+$11.65 shipping

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