MERCURY Outbrd Prop Merc Merc. Blk. 3-BLADE Al. Outbrd. Prop. 48-43586 A20L 13P 3/8

( Manufacturer Part Number: 4843586 ), ( Part Type: Prop ), ( Propeller Rotation: Standard ), ( California Prop 65 Warning: This Product May Contain Chemicals Known To The State Of California To Cause Cancer, Birth Defects, Or Other Reproductive Harm. )

Review MERCURY Merc. Blk. Max 3-blade Al. Outbrd. Prop. 3/8 Inch fits MERC MARINER 2010–2013

The **Mercury 4843586 Merc-Mariner 3-Blade A20L Outboard Propeller** is a high-performance, precision-engineered propeller designed to deliver exceptional efficiency, power, and handling for marine applications, particularly on mid-sized to larger outboard engines. This **48-inch pitch** propeller features a **3-blade design**, optimized for smooth operation and reduced cavitation, making it ideal for both recreational and light commercial use. The **A20L** designation indicates its **fixed-pitch, aluminum construction**, which balances durability with weight savings, ensuring reliable performance in a variety of conditions. With a **13-pitch (13 inches)** measurement, this propeller is engineered to maximize thrust while maintaining optimal RPM control, reducing strain on the engine and improving fuel efficiency. The **10 3/8-inch diameter** blades are crafted for a balance of speed and torque, allowing for better acceleration and top-end performance, whether cruising on calm waters or tackling moderate waves. The **smooth, aerodynamic blade contours** minimize drag and vibration, enhancing both comfort and longevity for the engine and drive system. Whether used on a fishing boat, a family cruiser, or a utility vessel, this propeller is built to handle demanding applications with precision, ensuring consistent power delivery and smooth operation across a wide range of speeds. Its robust construction and efficient design make it a dependable choice for those seeking reliable performance from their Mercury outboard engine.

### **Pros and Cons of buying a Mercury 4843586 (Mercury Mariner 3-Blade AL Outboard Prop 48-43586-A20L, 13P, 10 3/8")**

1. **High Performance and Efficiency** This is a high-quality aluminum (AL) propeller designed for Mercury outboards, optimized for speed, fuel efficiency, and power transfer. The three-blade design provides a balance between acceleration and top-end speed, making it suitable for cruising and sportfishing applications.

2. **Durability and Corrosion Resistance** Aluminum props are lighter than stainless steel and resistant to saltwater corrosion, which is ideal for marine environments. They are also less prone to denting from debris compared to stainless steel.

3. **Compatibility with Mercury Outboards** This specific model (48-43586-A20L) is engineered for Mercury outboards, ensuring proper fitment and performance tuning. It is designed for engines in the 150 250 HP range, making it a good match for many Mercury outboards of that power class.

4. **Versatile Use Case** The 13P pitch (13 inches) and 10 3/8" diameter make it suitable for a variety of boats, including mid-sized cruisers, sportfishers, and wakeboarders. The three-blade design offers a good compromise between acceleration and top speed.

5. **Aftermarket Availability and Tuning Options** Mercury props are widely available through marine dealers and online retailers. Additionally, this model can be tuned (e.g., pitch adjusted) for different load conditions, such as towing or heavy fishing.

6. **Lower Cost Compared to Stainless Steel** Aluminum props are generally less expensive than their stainless steel counterparts, making them a cost-effective choice for budget-conscious boat owners who still want reliable performance.

7. **Reduced Vibration** Properly matched props like this one help reduce engine vibration, improving comfort and longevity of the outboard and boat structure.

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1. **Limited Lifespan Compared to Stainless Steel** While durable, aluminum props are more susceptible to wear and tear over time, especially in abrasive environments (e.g., running over debris or rocks). They may require more frequent inspections and replacements compared to stainless steel props.

2. **Less Resistance to Impact Damage** Aluminum is softer than stainless steel, meaning it can dent or bend more easily from collisions with docks, buoys, or other objects. This can affect performance and require professional repairs.

3. **Potential for Corrosion Over Time** Although aluminum resists corrosion better than some metals, it can still degrade in harsh conditions (e.g., prolonged exposure to saltwater without proper maintenance). Rust or pitting may develop at the blade tips or hub over years of use.

4. **Weight Limitations** While lighter than stainless steel, aluminum props are still heavier than plastic or composite props. This may not be a significant issue for most boats, but it could matter for very lightweight or high-performance applications.

5. **Tuning Limitations** Unlike stainless steel props, which can be easily bent or reshaped for tuning, aluminum props are typically not repitchable without professional assistance. This limits the ability to fine-tune performance for specific loads or conditions.

6. **Higher Noise Levels** Aluminum props can generate slightly more noise than stainless steel due to their material properties, which may be noticeable in quiet cruising conditions.

7. **Potential for Warping** Extreme heat or prolonged exposure to sunlight can cause aluminum props to warp, affecting balance and performance. Proper storage (e.g., in a dry, shaded area) is recommended.

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The **Mercury 4843586 3-blade AL outboard prop** is a solid choice for boat owners seeking a balance between performance, cost, and durability. It excels in fuel efficiency, acceleration, and ease of maintenance, making it ideal for cruising, fishing, and light wakeboarding applications. However, its softer material means it requires more careful handling and may not last as long as stainless steel props in abrasive or high-impact environments.

If you prioritize **cost-effectiveness, lightweight durability, and compatibility with Mercury outboards**, this prop is a strong option. If you operate in **rough conditions, tow frequently, or prefer long-term durability**, a stainless steel prop might be a better investment despite the higher upfront cost.

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- You own a Mercury outboard in the 150 250 HP range and need a reliable, high-performance propeller for cruising or fishing.

- You want a balance between cost and performance without sacrificing too much durability.

- Your boat operates in moderate conditions and you are willing to inspect the prop regularly for wear or damage.

- You frequently run over debris, rocks, or docks, in which case a **stainless steel prop** (e.g., Mercury 48-43586-S20L) would be more durable.

- You plan to tow a heavy load or use the boat for high-performance wakeboarding, where a **custom stainless steel prop** might offer better tuning options.

- You are on a tight budget and could opt for a **used or refurbished aluminum prop** to save money.

**Final Verdict:** This is a **good mid-range propeller** for most Mercury outboard applications, provided you maintain it properly and avoid excessive abuse. For maximum longevity, pair it with a **propeller guard** if operating in rocky or debris-laden waters.

Details:

Fits: Primarily Mercury / Mariner 20-25 HP outboards including many 2-stroke and some 4-stroke model's from the 80s 2000era. Strong performer in the 10-3/8 x 13 range. Also compatible with certain Force model's. For sale is a genuine Mercury / Mariner Black Max 3-blade aluminum outboard propeller.

Always verify exact fitment for your motor/gear case. Part number: 48-43586 A20L 13P. Blades are solid with no major dings, bends, or repairs visible. Hub and spline look serviceable.

Great spare, replacement, or restoration part.

part #: 4843586 prices

• $5.62-$75.00

specifications propboapar:

• for models: Merc, Mariner
• for makes: Mercury
• for years: 2010-2013
• mpn: 4843586
• part type: Prop
• propeller rotation: Standard
• california prop 65 warning: This Product May Contain Chemicals Known To The State Of California To Cause Cancer, Birth Defects, Or Other Reproductive Harm.

payments propboapar:

• other
• credit card: Mastercard
• wallet: Paypal

general propboapar:

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

shipping propboapar:

• type: Calculated
• service: USPS Ground Advantage
• class: Standard
• transit: 7-12 Days
• cost: $18.63
• carrier: USPS

returns propboapar:

• policy: No Returns

offer propboapar:

• sold: 0
• best offers: True
• started: June 11, 2026
• quantity: 1
• availability: In Stock
• options: Ship-to-home

seller propboapar:

• city: Stockton, Missouri
• # reviews: 28
• rating: 100.0%

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