1. Boat Outboard Engines To Buy
  2. sku: 24013885017823892
  3. MERCURY 881311

MERCURY 881311 Outboard Motor Bolt Fillister Screw

fits make: Mercury. year: 1975–1990.

881311 Mercury 75 90 Four Stroke Outboard Motor Oem Bolt / Fillister Screw

( Manufacturer Part Number: 881311 ), ( Part Type: Motor Bolt Screw )

Review MERCURY Four Stroke Outboard Motor Oem Bolt Fillister Screw fits 1975–1990

The **Mercury 881311 75 /90 Bolt Fillister Screw** is a precision-engineered fastener specifically designed for marine applications, offering a robust and reliable solution for securing critical components on Mercury outboard motors. Crafted from high-quality, corrosion-resistant materials, this fillister screw is built to withstand the harsh conditions of saltwater environments, ensuring long-lasting performance and durability. The screw features a **75 or 90 drive head**, allowing for versatile installation depending on the specific requirements of the motor assembly, whether it be for mounting brackets, trim systems, or other structural components. Its **fine-thread design** provides a secure, tight fit, reducing the risk of loosening under vibration or dynamic loads, which is essential for maintaining the integrity of the outboard s mechanical systems. The fillister head design not only enhances grip during installation but also prevents accidental loosening, making it ideal for applications where safety and reliability are paramount. Whether used in new installations or for maintenance and repairs, this screw ensures a clean, professional finish while delivering the strength and precision needed to keep Mercury outboards running smoothly for years to come.

**Overview of the Mercury 881311 75 HP 90 Bolt Fillister Screw (Part Number 881311)**

This part is a **bolt fillister screw**, specifically designed for securing components on Mercury outboard motors, particularly those with a 75 HP engine (likely from the 90 V2 series). Below is a detailed analysis of its pros, cons, and a final recommendation.

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### **Pros**

1. **Compatibility and Fit**

- Designed specifically for Mercury outboards, ensuring a precise fit with minimal clearance issues. This reduces the risk of misalignment or improper installation.

- The **90 bolt fillister screw** is engineered to accommodate the unique mounting angles found in Mercury s V2 series engines, particularly the 75 HP model. This avoids the need for custom modifications or adapters.

2. **Durability and Material Quality**

- Mercury parts are generally manufactured from high-quality materials, including corrosion-resistant alloys and hardened steel, which enhances longevity in marine environments.

- The fillister head design provides a smooth, flush surface when tightened, reducing the risk of snagging on surrounding components or clothing.

3. **Ease of Installation**

- Standardized threading and head design make it straightforward to install with basic tools (e.g., socket wrench or ratchet). No specialized equipment is required.

- The bolt s design minimizes the chance of over-tightening, as the fillister head allows for better torque control compared to slotted or Phillips screws.

4. **Reliability in Marine Conditions**

- Marine-grade bolts are resistant to saltwater corrosion, which is critical for outboard motors exposed to prolonged moisture and salt air.

- The screw s design helps prevent loosening due to vibration, a common issue in marine applications.

5. **Cost-Effective Replacement**

- Purchasing an OEM (Original Equipment Manufacturer) part ensures compatibility and avoids the potential pitfalls of aftermarket alternatives that may not fit perfectly or last as long.

- Replacing a worn or damaged bolt is a relatively inexpensive fix compared to the cost of repairing or replacing a damaged motor component due to a failed fastener.

6. **Warranty Coverage**

- As an OEM part, it may be covered under Mercury s warranty if purchased directly from an authorized dealer or through their official channels. This provides peace of mind against defects.

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### **Cons**

1. **Limited Availability**

- Mercury parts, especially older or less common models like the 75 HP 90 bolt fillister screw, may not be readily available at all local marine supply stores. Purchasing may require ordering online from specialty suppliers, which could involve shipping delays.

- Some aftermarket suppliers may sell non-OEM alternatives that, while cheaper, might not fit perfectly or could corrode faster.

2. **Potential for Overpaying**

- OEM parts often come at a premium price compared to aftermarket equivalents. If the bolt is not critical to the engine s function, some buyers may opt for a cheaper alternative, risking compatibility issues.

- Prices can vary significantly depending on the seller (e.g., authorized dealers vs. third-party resellers).

3. **Tooling Requirements**

- While the bolt itself is simple to install, accessing it may require removing other components (e.g., cowling, trim tabs, or engine covers). This can be time-consuming and may require additional tools.

- In some cases, the bolt may be located in a tight or awkward space, making installation challenging without patience or specialized tools.

4. **Risk of Mix-Ups with Other Bolts**

- Mercury engines use a variety of bolt types (e.g., hex head, socket head, different lengths, and thread sizes). There is a risk of accidentally using the wrong bolt if spares are not labeled or stored properly. Using the incorrect bolt could lead to stripped threads or improper mounting.

- Always verify the part number and dimensions before installation to avoid errors.

5. **Environmental Factors**

- Even high-quality marine bolts can corrode over time if not properly maintained. Saltwater, freshwater, and UV exposure can accelerate wear, especially if the bolt is not regularly inspected or lubricated.

- In extreme conditions (e.g., tropical climates with high humidity), bolts may require more frequent checks and replacement.

6. **No Significant Performance Benefit**

- This bolt is a functional component, not a performance-enhancing part. Its primary purpose is to secure parts in place; replacing it will not improve horsepower, fuel efficiency, or speed. The benefit is purely in reliability and preventing failures.

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### **Conclusion and Recommendation**

The **Mercury 881311 75 HP 90 bolt fillister screw** is a **highly recommended purchase** for anyone maintaining or repairing a compatible Mercury outboard motor, particularly if the original bolt is missing, damaged, or corroded. Its **precision engineering, corrosion resistance, and ease of installation** make it a reliable choice for ensuring the structural integrity of the engine. The minor drawbacks such as potential availability issues or the need for careful selection are outweighed by the part s **durability and compatibility**.

**Recommendation:**

- **Buy the OEM part (881311) if possible**, especially if you value long-term reliability and warranty coverage. Purchase from an **authorized Mercury dealer or a reputable marine parts supplier** to ensure authenticity and avoid counterfeit or substandard alternatives.

- **Verify the part number and dimensions** before installation to confirm it matches your engine s requirements. Double-check that it is the correct length and thread size for the application.

- **Store spare bolts** in a dry, labeled container to prevent confusion with other fasteners.

- **Inspect bolts regularly** during routine maintenance, especially if the motor is used in saltwater or harsh conditions. Replace any bolts showing signs of corrosion, stripping, or deformation.

- **Consider aftermarket alternatives only if the OEM part is unavailable or significantly overpriced**, but be cautious of quality differences. Brands like **TorqFit, Starrett, or marine-specific suppliers** may offer compatible options, but test-fit them first.

For most boat owners, the **cost and effort of using the correct OEM bolt are justified** to avoid potential engine damage or failure due to a failed fastener. The **peace of mind** from knowing the part is designed specifically for your Mercury engine outweighs the minor inconveniences.

Details:

It is a genuine Mercury part, not an inferior knockoff. The component in this kit was pulled from a 2005 Mercury 90hp 90ELPT 4S Four-Stroke Carburetors Outboard Motor. Mercury / Yamaha 75 75hp - 90 90hp Four-Stroke Outboard Motor Head Bolt Fillister Screw. Condition: Used, Good.

Part No: 881311. Replaces: 804117.

part #: 881311 prices

  • $20.00-$30.00

specifications ouboaen:

  • for makes: Mercury
  • for years: 1975-1990
  • mpn: 881311
  • part type: Motor Bolt Screw

general ouboaen:

  • Boat Parts > Outboard Engines Components > Other
  • condition: Used

returns ouboaen:

  • policy: No Returns

seller ouboaen:

  • city: Saucier, Mississippi
  • # reviews: 168
  • rating: 100.0%

shipping ouboaen:

  • transit: 4-10 Days
  • service: USPS Ground Advantage
  • carrier: USPS
  • type: Fixed
  • class: Standard
  • cost: $12.00

payments ouboaen:

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offer ouboaen:

  • best offers: True
  • quantity: 1
  • started: May 18, 2026
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home
for makes: mercury, for years: 1975-1990, part type: motor bolt screw,
category: boat parts > outboard engines components, sku: 24013885017823892,
Mercury 881311 Is Similar To:
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