OG 203786S Boat Propeller Oj Blade Cup Splined Shaft 14.25 14.5 .120

( Brand: Og ), ( Manufacturer Part Number: 203786S ), ( Part Type: Propeller Blade Shaft ), ( Propeller Pitch: 14 )

Review OG Boat Propeller Gmp Oj Blade Bronze 14.25 14.5 .120 Cup Splined Shaft

The **OG 203786S Boat Propeller** is a high-performance, precision-engineered marine propeller designed for optimal efficiency, durability, and reliability in demanding boating applications. This **three-blade propeller** features a **14.25-inch pitch** and a **14.5-inch diameter**, striking a balance between speed and torque to deliver exceptional thrust while minimizing fuel consumption and wear on the engine. The **cup-shaped blade design** enhances hydrodynamic efficiency by reducing cavitation and improving water flow, making it ideal for both cruising and high-performance vessels. The **splined shaft** ensures a secure and vibration-dampening connection to the engine, reducing stress on the drivetrain and extending the lifespan of the propeller and transmission components.

Crafted from **high-grade, corrosion-resistant materials**, this propeller is built to withstand the harshest marine environments, including saltwater exposure, UV radiation, and constant mechanical stress. The **smooth, polished finish** minimizes drag and maximizes efficiency, while the **reinforced blade structure** provides resistance against bending, pitting, and erosion common issues that can compromise performance over time. Whether used on a **speedboat, fishing vessel, or performance cruiser**, this propeller excels in delivering **consistent power delivery, reduced noise, and improved fuel economy**, making it a premium choice for serious boaters who demand both performance and longevity.

The **OG 203786S** is a versatile option for engines requiring a **120-degree shaft angle**, ensuring proper alignment and optimal power transfer. Its **custom-engineered blade geometry** allows for fine-tuned adjustments in thrust and RPM handling, making it suitable for a range of applications, from **towing heavy loads** to **high-speed planing**. Built to meet or exceed industry standards, this propeller combines **innovative design with robust construction**, ensuring that it remains a reliable workhorse for years of use. Whether you're looking to upgrade for better speed, fuel efficiency, or overall performance, the **OG 203786S** delivers a seamless blend of power and precision, making it a standout choice for discerning boat owners.

### **Pros and Cons of buying a OG 203786S Boat Propeller (14.25" x 14.5" x 120 Cup, Splined Shaft)**

1. **Performance Optimization** The 14.25" x 14.5" pitch with a 120-degree cup design is engineered for balanced speed and torque, making it suitable for mid-sized outboards (typically 150 250 HP). The cup shape improves efficiency by reducing cavitation and enhancing thrust.

2. **Durability** OG propellers are known for high-quality materials, including stainless steel blades, which resist corrosion and wear better than aluminum or bronze alternatives. The splined shaft ensures a secure, vibration-dampening connection to the engine.

3. **Versatility** The 14.25" x 14.5" dimensions fit a range of boats (e.g., 17 20 ft center consoles, bowriders, or fishing boats) with similar shaft sizes. The cup design also works well for both cruising and light planing applications.

4. **Ease of Installation** The splined shaft design simplifies mounting compared to keyed shafts, reducing the risk of misalignment. OG propellers often come with clear installation instructions and may include a torque wrench recommendation for proper tightening.

5. **Brand Reputation** OG (Outboard Gear) is a well-established manufacturer with a focus on performance and reliability. Their propellers are frequently recommended for stock replacements or upgrades in marine forums and by dealers.

6. **Fuel Efficiency** A well-matched propeller can improve fuel economy by reducing unnecessary drag and optimizing engine RPM. The 120-degree cup helps maintain efficiency at higher speeds without excessive wear.

7. **Resale Value** High-quality propellers like this one retain value better than generic or low-end brands, which can be beneficial if you plan to sell the boat later.

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1. **Cost** OG propellers are premium-priced compared to basic or aftermarket alternatives. The 203786S model may cost significantly more than a generic stainless steel propeller, especially if purchased new.

2. **Potential Overkill for Low-HP Engines** If your engine is under 150 HP or heavily modified, the 14.5" pitch might be too aggressive, leading to excessive RPM or difficulty planing. A slightly smaller pitch (e.g., 13.5") could be more efficient.

3. **Weight** Stainless steel propellers are heavier than aluminum or bronze, which may affect handling in smaller boats or when towing. This is less of an issue for larger vessels but worth considering for lightweight boats.

4. **Limited Customization** Unlike some brands, OG offers fewer options for blade adjustments (e.g., pitch changes or cup angles) if your boat s needs evolve. You may need to purchase a new propeller for significant modifications.

5. **Installation Complexity** While splined shafts are secure, improper installation (e.g., overtightening or misalignment) can damage the shaft or propeller. Requires careful following of torque specifications.

6. **Market Availability** OG propellers may not be as widely stocked as brands like Mercury or Bronco, potentially requiring special ordering or longer lead times.

7. **Potential for Cavitation** If the propeller is not perfectly matched to your engine s powerband, the 120-degree cup could experience cavitation at high loads, reducing longevity. This is more common in heavily loaded or modified setups.

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The **OG 203786S propeller (14.25" x 14.5" x 120 cup, splined shaft)** is an excellent choice for boats with **150 250 HP outboards** seeking a balance of speed, efficiency, and durability. Its stainless steel construction and optimized design make it ideal for stock or lightly modified applications where performance and longevity are priorities. However, it may not be the best fit for **low-HP engines, heavily modified setups, or budget-conscious buyers**, as alternatives could offer better value or adaptability.

- **Buy if:** You have a **150 250 HP outboard** in a **17 20 ft boat**, prioritize **durability and performance**, and want a **stock or near-stock replacement** with minimal cavitation. The splined shaft and cup design will enhance efficiency and reduce wear over time.

- Your engine is **under 150 HP** (opt for a smaller pitch, e.g., 13.5").

- You plan to **modify the boat significantly** (e.g., adding weight or changing the hull), as a custom propeller may be needed.

- You re on a **tight budget** (compare with brands like **Bronco, Mercury, or MarineStar** for similar performance at lower cost).

- Your boat is **very lightweight** (a lighter propeller may improve handling).

For most **stock or lightly modified boats in the 150 250 HP range**, the OG 203786S is a **strong, reliable choice** that justifies its cost with long-term efficiency and durability. Always verify the propeller s compatibility with your engine s **powerband and RPM range** before purchasing.

Details:

OEM on 2006 2013 Master Craft X2 and compatible with similar spline-shaft V-drive boats including X1, X10, X15, X30 mid-2000s to early 2010 BOAT PROPELLER GMP OJ - 4 BLADE BRONZE 14.25 X 14.5 .120 CUP SPLINED MASTERCRAFT PN 203786S, From a 2007 Master craft X2 350 MCX.

specifications propboapar:

• brand: Og
• mpn: 203786s
• part type: Propeller Blade Shaft
• propeller pitch: 14

general propboapar:

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

shipping propboapar:

• service: FedEx Ground / FedEx Home Delivery
• cost: $23.39
• transit: 2-6 Days
• carrier: FedEx
• class: Standard
• type: Calculated

payments propboapar:

• other
• credit card: Discover
• wallet: GoOgle-pay

returns propboapar:

• policy: No Returns

offer propboapar:

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

seller propboapar:

• # reviews: 10
• rating: 0.0%
• city: Spokane, Washington

Og 203786S Is Similar To:

• West By North B5-og Campbell Sailor Propeller 3 Blade Bronze 4 Inch Tapered Shaft D 14 Rh P7 Prop (44.8% similar) The sailor prop provides superior strength, durability and separability. Campbell sailor propeller in very good condition. I used this propeller on my hunter 33' and it improved performance significantly allowing me to achieve hull speed more quickly than with 2 blade standard prop less vibration...(May 16th, 2026)