3911668
Hexagon Head Cap Screw
Cummins®

The Hexagon Head Cap Screw, specifically the 3911668 model produced by Cummins, plays a significant role in the assembly and maintenance of commercial trucks. This screw is designed to provide secure fastening in various truck components, ensuring the integrity and reliability of the vehicle’s structure and systems.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of fastener characterized by its hexagonal head, which allows for efficient tool engagement. This design enables the application of torque with minimal risk of cam-out, making it ideal for high-stress applications. The screw’s threaded shaft is designed to create a strong, secure connection when driven into a corresponding threaded hole. The hexagonal head provides a larger surface area for tool contact compared to other head types, enhancing the screw’s ability to withstand high torque levels without stripping ¹.

Role of the 3911668 Hexagon Head Cap Screw in Truck Operation

The 3911668 Hexagon Head Cap Screw is utilized in various applications within commercial trucks. It is commonly employed in the assembly of engine components, chassis parts, and other critical systems where secure fastening is required. This screw contributes to the structural integrity of the truck by ensuring that components remain firmly attached under operational stress and vibrations. Its role in maintaining the alignment and stability of truck parts is vital for the overall performance and safety of the vehicle ².

Key Features

The 3911668 Hexagon Head Cap Screw boasts several key features that enhance its performance and durability. It is typically made from high-strength steel, which provides excellent tensile strength and resistance to wear. The screw features a fully threaded design, allowing it to engage deeply into the material it is fastening. Additionally, it may be coated with a corrosion-resistant finish to protect against environmental factors that could compromise its integrity over time. The precise manufacturing tolerances ensure consistent performance across applications ³.

Benefits

The 3911668 Hexagon Head Cap Screw offers several benefits in commercial truck applications. Its design allows for secure fastening, reducing the risk of component loosening due to vibration. The ease of installation and removal, thanks to the hexagonal head, simplifies maintenance procedures. The screw’s resistance to corrosion and wear ensures long-term reliability, even in harsh operating conditions. These attributes contribute to the overall efficiency and safety of truck operations ⁴.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration and corrosion. Regular inspection and tightening of screws can prevent these issues. If corrosion is detected, the affected screws should be replaced to maintain the integrity of the fastening. Proper torque settings should be used during installation to avoid over-tightening, which can lead to stripping, or under-tightening, which can result in inadequate fastening. Adhering to these maintenance practices ensures the longevity and reliability of the fastener in truck applications ⁵.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established itself as a trusted name in the commercial vehicle industry. The company is renowned for its expertise in diesel engines and related technologies, consistently delivering innovative solutions that enhance the performance, efficiency, and reliability of commercial vehicles. Cummins’ commitment to quality and innovation is evident in its comprehensive range of products, including the 3911668 Hexagon Head Cap Screw ⁶.

Cummins Engine Part 3911668: Hexagon Head Cap Screw

The Cummins part number 3911668, a Hexagon Head Cap Screw, is a critical component in the assembly and maintenance of several Cummins engine models. This part is integral to the structural integrity and operational efficiency of the engines it supports.

4B3.9 and 6B5.9 Engines

In the 4B3.9 and 6B5.9 engines, the Hexagon Head Cap Screw is used in various applications where secure fastening is essential. These engines, known for their robust design and reliability, often require precise and durable fasteners to maintain their complex systems. The 3911668 part ensures that components are held firmly in place, contributing to the overall performance and longevity of the engine ⁷.

B5.9 G and ISB CM550 Engines

For the B5.9 G and ISB CM550 engines, the Hexagon Head Cap Screw plays a similar role. These engines, which are part of Cummins’ lineup of high-performance diesel engines, demand high-quality fasteners to handle the stresses and demands of heavy-duty applications. The 3911668 part is used in critical areas where it must withstand significant mechanical forces and environmental conditions ⁸.

Grouping by Application

While the specific applications of the 3911668 Hexagon Head Cap Screw may vary across different engine models, its importance remains consistent. This part is typically used in areas where:

• Structural Integrity is paramount, such as in the engine block or cylinder head.
• Vibration Resistance is needed, as it helps in maintaining the alignment and stability of moving parts.
• Ease of Maintenance is crucial, allowing for quick and efficient assembly and disassembly during service.

By ensuring that components are securely fastened, the 3911668 Hexagon Head Cap Screw contributes to the reliability and efficiency of Cummins engines across various models ⁹.

Role of Part 3911668 Hexagon Head Cap Screw in Engine Systems

The part 3911668 Hexagon Head Cap Screw is instrumental in securing various components within engine systems, ensuring their stability and proper function.

In the Air Heater Starting system, this screw is used to fasten the Air Intake Heater to its housing. This secure attachment is essential for the heater to function correctly, providing the necessary warmth to aid in engine starting under cold conditions.

Within the Drive mechanism, the Hexagon Head Cap Screw is employed to attach the Fan to the Flywheel. This connection is vital for the fan’s operation, which helps in cooling the engine by drawing air through the system.

In the Injector Fuel Supply Tube assembly, the screw plays a role in securing the tube to its designated Location. This ensures a stable and leak-free connection, which is important for the precise delivery of fuel to the engine.

For the Plumbing and Fuel systems, the screw is utilized to attach the Fuel Shutoff Valve to its housing. This secure fitting is necessary for the valve to effectively control the flow of fuel, ensuring safe and efficient engine operation.

Overall, the part 3911668 Hexagon Head Cap Screw is a fundamental component in maintaining the integrity and functionality of various engine systems ¹⁰.

Conclusion

The 3911668 Hexagon Head Cap Screw is a vital component in the assembly and maintenance of commercial trucks and Cummins engines. Its design, featuring a hexagonal head and fully threaded shaft, ensures secure fastening and resistance to corrosion and wear. The screw’s role in maintaining structural integrity, vibration resistance, and ease of maintenance is crucial for the overall performance and safety of the vehicle. Regular inspection and proper maintenance practices are essential to ensure the longevity and reliability of this Cummins part in various engine applications.