MERCURY MARINE 48-47922A1 Prop Spline Shaft Collar Spacer 7.5HP 7.25 7P

( Brand: Mercury Marine ), ( Manufacturer Part Number: 48-47922A1 ), ( Part Type: 5hp Prop Shaft Spacer )

Review MERCURY MARINE Prop 7.5hp Spline Shaft 7.25 7p Collar And Spacer

The **Mercury Marine 48-47922A1 Propeller Shaft Assembly** is a precision-engineered component designed exclusively for high-performance outboard motors, specifically the **7.5 HP series**, ensuring optimal power transfer and reliability for small to mid-sized boats. This **spline shaft** is a critical part of the drive system, connecting the motor s gearcase to the propeller, and is meticulously crafted to withstand the demands of frequent use in freshwater, saltwater, or mixed environments. The **7.25-inch diameter** and **7-pitch collar spacer** are engineered to maintain proper alignment and torque distribution, reducing wear on both the propeller and the motor s internal components. Built with **high-grade marine-grade steel**, this shaft is heat-treated and dynamically balanced to minimize vibration, enhancing both the performance and longevity of your Mercury outboard. The **A1 designation** indicates a specific model variant, often featuring slight modifications for improved durability or compatibility with certain propeller types, ensuring a seamless fit with the motor s internal spline system. Whether installed on a trolling boat, a utility vessel, or a recreational fishing craft, this propeller shaft delivers the precision and strength required to maximize thrust while minimizing energy loss, making it an essential upgrade for those seeking enhanced efficiency and reliability in their Mercury-powered watercraft.

### **Pros and Cons of buying a Mercury Marine 48-47922A1 Prop (7.5HP, Spline Shaft, 7.25" Collar, Spacer)**

1. **Compatibility with Mercury 7.5HP Outboards** This prop is specifically designed for Mercury Marine 7.5 horsepower outboards, ensuring proper fit and performance. It is part of the **48-series**, which is a common and well-supported propeller line for this engine size.

2. **High-Quality Construction** Mercury Marine is a reputable brand known for durable marine hardware. The **stainless steel blades** and **precision-machined components** suggest reliability, especially for frequent use in saltwater or freshwater.

3. **Optimized for Performance** The **7.25" collar diameter** and **spacer** are designed to match the engine s shaft and throttle response, improving acceleration and fuel efficiency. The **7-pitch** (likely referring to blade pitch) is suitable for general boating, fishing, or light cruising applications.

4. **Easy Installation** The **spline shaft connection** is a standard design for Mercury 7.5HP outboards, meaning most mechanics or boat owners can install it without specialized tools. The **spacer** ensures proper alignment with the engine s internal components.

5. **Widely Available & Affordable** As a common replacement part, this propeller is stocked by most marine supply stores, dealerships, and online retailers (e.g., West Marine, Amazon, local marine shops). Pricing is reasonable compared to aftermarket alternatives.

6. **Durability in Harsh Conditions** Stainless steel props resist corrosion better than aluminum or bronze in saltwater environments, extending the propeller s lifespan if properly maintained.

7. **Backed by Warranty** Mercury Marine typically offers warranties on new parts, providing some assurance against manufacturing defects.

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1. **Limited to Specific Applications** This prop is **not universal**; it is **engine-specific** (Mercury 7.5HP) and may not fit other brands or horsepower ratings. Attempting to use it on a non-Mercury or mismatched engine could cause damage.

2. **Potential for Wear Over Time** Even high-quality props degrade with use, especially in abrasive environments (e.g., running over debris, saltwater corrosion). Regular inspection and maintenance are required to prevent blade damage.

3. **No Customization for Unique Needs** If your boating style requires a different pitch (e.g., high-speed planing vs. deep-V cruising), this standard prop may not be optimal. Custom props (e.g., from **PropTech, AquaProp**) could offer better performance but at a higher cost.

4. **Weight Consideration** Stainless steel props are heavier than aluminum, which may slightly reduce maneuverability in smaller boats. However, the difference is minimal for a 7.5HP engine.

5. **Potential for Counterfeit Parts** Purchasing from unverified sellers (e.g., third-party Amazon sellers) risks receiving **fake or low-quality replicas**. Always buy from authorized dealers or reputable suppliers.

6. **Maintenance Required** Like all props, this one needs **regular cleaning (especially in saltwater), blade balancing, and inspection for nicks or corrosion**. Neglecting maintenance can lead to reduced performance or failure.

7. **Replacement Cost if Damaged** If the prop sustains significant damage (e.g., bent blades, cracked shaft), replacement costs may outweigh the original purchase price, especially if the boat is older.

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### **Conclusion**

The **Mercury Marine 48-47922A1 prop (7.5HP, spline shaft, 7.25" collar, spacer)** is a **practical, reliable, and cost-effective choice** for owners of **Mercury 7.5HP outboards** who need a standard replacement propeller. Its **durability, compatibility, and ease of installation** make it a solid option for general boating, fishing, or light cruising. However, it is **not ideal for high-performance or specialized applications** where a custom prop might be better.

If you are certain the prop fits your engine and boating needs, it is a **safe purchase**. However, if you plan to modify your boat s performance (e.g., for speed, fuel efficiency, or towing), consider consulting a marine mechanic or propeller specialist to determine if a different pitch or material would be more suitable.

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### **Recommendation**

- You have a **Mercury 7.5HP outboard** and need a **direct replacement** for a damaged or worn prop.

- You primarily use your boat for **general cruising, fishing, or light planing** without extreme demands.

- You purchase it from an **authorized dealer or trusted supplier** to avoid counterfeit parts.

- You are prepared for **regular maintenance** (cleaning, inspection, and balancing).

- You want **better performance** (e.g., higher speed, better fuel efficiency) and are willing to invest in a **custom prop** (e.g., from **PropTech or AquaProp**).

- Your boat operates in **extremely abrasive conditions** (e.g., frequent contact with rocks, debris), and you prefer a **more durable material** (e.g., **nickel-aluminum-bronze props**).

- You are unsure about the **exact fit** always verify compatibility with your engine model before purchasing.

**Final Verdict:** For most **standard Mercury 7.5HP outboard owners**, this propeller is a **good, no-frills choice** that balances **cost, reliability, and performance**. However, those seeking **optimized performance** may benefit from exploring specialized options.

Details:

Message me if you're not sure for confirmation it fits your serial number. All of my parts come cleaned and ready to install. Thanks and Happy Boating. I tried to take pictures of all them from different angles.

Most come with hardware when pictured. 7.25 7P Aluminum Spline Shaft Prop with splinted thrust washer and spacer is off a 7.5hp 2cyl 60s. Mercury Marine. Its very usable and even more if you tune it up with a file your call.

This one fits serial numbers between 457.

part #: 4847922a1 prices

• $18.13-$198.99

specifications propboapar:

• for makes: Mercury
• brand: Mercury Marine
• mpn: 48-47922a1
• part type: 5hp Prop Shaft Spacer

returns propboapar:

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

general propboapar:

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

payments propboapar:

• credit card: Diners-club
• other
• wallet: Apple-pay

offer propboapar:

• quantity: 1
• options: Ship-to-home
• started: May 2, 2026
• availability: In Stock
• sold: 0

shipping propboapar:

• service: USPS Ground Advantage
• cost: $11.25
• type: Calculated
• class: Standard
• carrier: USPS
• transit: 4-9 Days

seller propboapar:

• # reviews: 256
• city: Vallejo, California
• rating: 100.0%

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