OMC 0389512 Sst Propeller Freshwater 3/4X21 60-140HP

( Brand: Omc ), ( Manufacturer Part Number: 0389512 ), ( Part Type: Propeller ), ( Propeller Pitch: 21 ), ( Propeller Rotation: Standard ), ( Country Of Origin: United States )

Review OMC Johnson Evinrude Sst Propeller 3/4x21 60-140hp Freshwater fits 2012

The **OMC 0389512 Johnson/Evinrude SST Propeller (12 3/4" x 21")** is a high-performance, precision-engineered marine propeller designed exclusively for freshwater applications, delivering unmatched efficiency, reliability, and power transfer for outboards in the **60 140 horsepower** range. Crafted from **high-grade, corrosion-resistant stainless steel**, this **SST (Super Single Thread)** propeller features a **unique, asymmetrical blade design** that optimizes thrust while minimizing cavitation, ensuring smooth operation even at high RPMs. The **12 3/4-inch diameter** and **21-inch pitch** combination strikes an ideal balance between acceleration and top-end speed, making it perfect for a variety of freshwater boats from **fishing vessels and wakeboarders** to **performance cruisers and speedboats**. The **SST thread pattern** enhances water flow over the blade, reducing drag and improving fuel efficiency, while the **optimized blade rake** ensures better handling and reduced vibration, even under heavy loads. Built to withstand the demands of frequent use, this propeller is **fully balanced and precision-machined** to minimize wear on the outboard s gearcase, extending both the propeller s lifespan and the engine s longevity. Whether you re accelerating quickly off the dock, maintaining steady speed on the water, or navigating tight turns, the **OMC 0389512** delivers consistent, high-performance propulsion with minimal effort, making it a **must-have upgrade** for any freshwater enthusiast seeking maximum power and efficiency.

### **Pros and Cons of buying a OMC 0389512 Johnson/Evinrude SST Propeller (12 3/4" x 21" for 60-140hp Freshwater)**

1. **High Performance in Freshwater** The SST (Super Sport Technology) propeller is optimized for freshwater use, where sediment and debris are common. Its design reduces cavitation and improves efficiency in these conditions.

2. **Wide Power Range Compatibility** This propeller is designed for engines between **60-140hp**, making it versatile for a variety of boats, from mid-sized fishing vessels to personal watercraft or small cruisers.

3. **Durability & Corrosion Resistance** Made with high-quality materials, it is built to withstand freshwater environments, which can be harsh due to minerals and algae buildup.

4. **Efficient Fuel & Performance** The SST design helps reduce fuel consumption and improves acceleration, making it cost-effective over time.

5. **Easy Installation & Replacement** Standardized for Johnson/Evinrude outboards, it fits seamlessly without requiring major modifications.

6. **Reduced Vibration & Smooth Operation** The blade design minimizes vibration, leading to a quieter and more comfortable ride.

7. **Compatibility with Common Boats** Works well with **12.5" x 21" shaft diameters**, which is a common size for mid-sized boats.

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1. **Cost** Like most high-performance propellers, this is likely more expensive than standard propellers, especially if purchased new.

2. **Potential for Wear in Harsh Conditions** While designed for freshwater, extreme conditions (e.g., heavy sediment, frequent grounding) can still cause premature wear.

3. **Not Universal** Only fits **60-140hp Johnson/Evinrude outboards** with the correct shaft size. Checking compatibility before purchase is essential.

4. **Requires Proper Tuning** For optimal performance, the propeller may need to be tuned (blade pitch adjusted) based on load and engine specs, which could involve professional assistance.

5. **Limited Longevity in Saltwater** While marketed for freshwater, prolonged exposure to saltwater can accelerate corrosion, reducing lifespan.

6. **Weight** Some SST propellers are heavier than standard models, which may slightly affect maneuverability in tight spaces.

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The **OMC 0389512 Johnson/Evinrude SST Propeller (12 3/4" x 21")** is a strong choice for freshwater applications, particularly for boats in the **60-140hp range**. Its performance benefits, durability, and efficiency make it a worthwhile investment for those who prioritize speed, smooth operation, and longevity in freshwater environments. However, buyers should consider the upfront cost, proper installation, and potential maintenance needs.

- **Buy if:** You have a **Johnson/Evinrude outboard (60-140hp)**, primarily use your boat in **freshwater**, and want **better fuel efficiency, reduced vibration, and improved acceleration**.

- **Consider alternatives if:** You frequently operate in **saltwater**, need a **budget-friendly option**, or have an **older boat with a non-standard shaft size**.

- **Best for:** Fishing boats, personal watercraft, or cruisers where performance and durability in freshwater are key.

For the best results, ensure proper installation and periodic inspection to maintain optimal performance.

Details:

JOHNSON/EVINRUDE/OMC Marine SST 12.75 X 21 Propeller #389512. Fits 13 Tooth Spline. BRP/OMC part number: 0389512.

part #: 0389512 prices

• $79.95-$349.64

specifications propboapar:

• for makes: Johnson, Evinrude, Omc
• for years: 2012
• brand: Omc
• mpn: 0389512
• part type: Propeller
• propeller pitch: 21
• propeller rotation: Standard
• country of origin: United States

payments propboapar:

• credit card: Visa
• wallet: Google-pay
• other

shipping propboapar:

• transit: 3-7 Days
• type: Calculated
• service: UPS Ground Saver
• carrier: UPS
• cost: $0.00
• class: Economy

general propboapar:

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

seller propboapar:

• city: Little Falls, Minnesota
• # reviews: 8022
• rating: 99.8%

returns propboapar:

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

offer propboapar:

• options: Ship-to-home
• quantity: 1
• sold: 0
• availability: In Stock
• best offers: True
• started: February 23, 2026

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