3905426
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw, specifically Part #3905426, is a component manufactured by Cummins, a well-established name in the automotive industry. This screw is significant in the context of heavy-duty trucks, where it contributes to the structural integrity and operational efficiency of various truck components. Cummins is renowned for its commitment to quality and innovation, ensuring that its products meet the demanding requirements of heavy-duty applications ².

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and a flange beneath the head. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area to distribute the load and prevent the screw from sinking into the material. In a truck’s mechanical system, these screws are used to secure components, ensuring they remain firmly in place under various operational stresses ¹.

Purpose and Role in Truck Operation

The 3905426 Hexagon Flange Head Cap Screw plays a specific role in the operation of a truck by securing critical components such as engine parts, transmission elements, and chassis assemblies. Its applications range from fastening engine blocks to securing exhaust systems. The screw’s design ensures that these components remain securely attached, contributing to the overall reliability and performance of the truck.

Key Features

The 3905426 Hexagon Flange Head Cap Screw boasts several key features that enhance its functionality:

• Hexagonal Head Design: This design allows for easy and efficient torque application using common tools, ensuring that the screw can be tightened to the required specifications.
• Flange Characteristics: The flange beneath the head provides additional surface area, which helps distribute the load and prevents the screw from sinking into the material. This feature is particularly beneficial in applications where the screw is subjected to high loads or vibrations.
• Material Properties: Constructed from high-strength materials, this screw offers excellent durability and resistance to corrosion, making it suitable for the harsh environments often encountered in heavy-duty truck applications.

Benefits

The 3905426 Hexagon Flange Head Cap Screw offers several benefits:

• Enhanced Durability: The high-strength material used in its construction ensures that the screw can withstand the rigors of heavy-duty truck applications.
• Improved Torque Application: The hexagonal head design allows for precise and efficient torque application, reducing the risk of over-tightening or under-tightening.
• Resistance to Loosening: The flange design helps prevent the screw from loosening over time, even in applications subjected to significant vibrations or dynamic loads.

Installation and Usage

Proper installation of the 3905426 Hexagon Flange Head Cap Screw is crucial for ensuring its effectiveness:

• Recommended Torque Settings: Follow the manufacturer’s torque settings to ensure the screw is tightened to the appropriate level without risking damage to the screw or the surrounding material.
• Best Practices: Use the correct tools for installation to avoid damaging the hexagonal head. Ensure that the surface where the screw will be installed is clean and free of debris to promote a secure fit.

Troubleshooting and Maintenance

To ensure the longevity of the 3905426 Hexagon Flange Head Cap Screw, consider the following maintenance tips:

• Regular Inspections: Periodically check the screw for signs of wear, corrosion, or loosening. Early detection of issues can prevent more significant problems down the line.
• Tightening: If the screw shows signs of loosening, re-tighten it to the recommended torque settings. Avoid over-tightening, as this can lead to damage.
• Replacement: If the screw exhibits significant wear or corrosion, replace it to maintain the integrity of the secured components.

Cummins Overview

Cummins is a reputable manufacturer with a long-standing history in the automotive industry. Known for its commitment to quality and innovation, Cummins produces a wide range of components for heavy-duty trucks. The company’s dedication to excellence ensures that its products, including the 3905426 Hexagon Flange Head Cap Screw, meet the high standards required for demanding applications ².

Engine Compatibility with Hexagon Flange Head Cap Screw Part 3905426

The Cummins part 3905426, a Hexagon Flange Head Cap Screw, is designed to fit seamlessly with a variety of Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening and reliable performance.

Compatible Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B3.9 G
• B5.9 G
• B5.9 GAS PLUS CM556
• G5.9
• G5.9 CM558
• ISB5.9G CM2180

Grouped Compatibility

• B3.9 Series:

  • 4B3.9
  • B3.9 G

• B5.9 Series:

  • 6B5.9
  • B5.9 G
  • B5.9 GAS PLUS CM556
  • G5.9
  • G5.9 CM558

• ISB Series:

  • ISB5.9G CM2180

• 6C Series:

  • 6C8.3

This part is engineered to meet the specific requirements of each engine model, ensuring compatibility and optimal performance across the board.

Role of Part 3905426 Hexagon Flange Head Cap Screw in Engine Systems

The part 3905426 Hexagon Flange Head Cap Screw is instrumental in securing various components within engine systems, ensuring their stability and proper function.

Alternator Location

In the alternator location, this screw plays a significant role in attaching the alternator to the engine block or mounting bracket. The alternator, responsible for generating electrical power to charge the battery and power the vehicle’s electrical systems, must be firmly secured to prevent vibrations and ensure consistent performance. The Hexagon Flange Head design of the screw provides a broad bearing surface, which helps distribute the load and reduce the risk of stripping or loosening over time.

Drive System

Within the drive system, the Hexagon Flange Head Cap Screw is often used to secure pulleys, brackets, and other components that are essential for the operation of the serpentine belt. This belt drives multiple engine accessories, including the alternator, power steering pump, and air conditioning compressor. Proper attachment of these components is vital for the smooth and efficient transfer of power, minimizing wear and tear on the belt and associated parts.

Alternator

When focusing specifically on the alternator, the Hexagon Flange Head Cap Screw is employed to fasten the alternator to its bracket or directly to the engine. This secure attachment is necessary to maintain the alternator’s alignment and operational efficiency. Any misalignment or instability can lead to inefficient power generation, increased wear on the alternator bearings, and potential failure of the electrical system.

Conclusion

In summary, the part 3905426 Hexagon Flange Head Cap Screw is a key component in ensuring the reliable and efficient operation of engine systems by providing a strong and stable connection between critical parts. Its design and material properties make it suitable for the demanding environments of heavy-duty truck applications, contributing to the overall performance and durability of the vehicle.