3863794
Hexagon Flange Head Cap Screw
Cummins®

The Hexagonal Flange Head Cap Screw, identified by part number 3863794, is a component manufactured by Cummins, a well-established name in the automotive and heavy-duty truck industry. This screw plays a significant role in the assembly and maintenance of commercial trucks, ensuring the secure fastening of various components. Its design and functionality are tailored to meet the demanding requirements of heavy-duty applications.

Basic Concepts and Functionality

A Hexagonal Flange Head Cap Screw is characterized by its hexagonal head, which provides a larger surface area for torque application compared to traditional hex screws. This design reduces the risk of cam-out and allows for more efficient tightening. The flange at the base of the head offers additional resistance to loosening, which is particularly beneficial in dynamic environments where vibrations are common. The screw’s thread engages with the mating part, creating a secure connection that is vital for the integrity of truck assemblies ¹.

Role in Truck Operation

The 3863794 Hexagonal Flange Head Cap Screw is integral to the operation of heavy-duty trucks. It is used to fasten components that require a high degree of security and stability, such as engine mounts, transmission housings, and chassis parts. By providing a robust connection, this screw helps maintain the structural integrity of the truck, ensuring that components remain in place under various operating conditions ².

Key Features

The 3863794 Hexagonal Flange Head Cap Screw is crafted from high-strength materials, typically alloy steel, to withstand the rigors of heavy-duty use. It features a coarse thread that allows for quick installation and removal, while the hexagonal flange head enhances torque application and resists loosening. Additionally, the screw may be treated with a special coating to improve corrosion resistance, extending its service life in harsh environments ³.

Benefits

Using the 3863794 Hexagonal Flange Head Cap Screw offers several advantages. Its design allows for improved load distribution across the fastening area, reducing the risk of component failure. The screw’s resistance to vibration ensures that connections remain secure over time, minimizing the need for frequent re-tightening. Furthermore, the ease of installation and removal facilitates maintenance procedures, contributing to the overall efficiency of truck operations.

Installation and Usage Guidelines

Proper installation of the 3863794 Hexagonal Flange Head Cap Screw is crucial for optimal performance. It should be installed using the correct torque specifications provided by the manufacturer to ensure a secure fit without over-tightening, which could damage the screw or the mating part. Best practices include using a torque wrench for accurate application and periodically checking the tightness of the screw to maintain secure fastening.

Troubleshooting and Maintenance

Common issues with the 3863794 Hexagonal Flange Head Cap Screw may include loosening due to vibration or corrosion in exposed applications. Regular inspection and maintenance can prevent these issues. If loosening is detected, the screw should be re-tightened to the specified torque. In cases of corrosion, the affected area should be cleaned, and a corrosion-resistant coating may be applied to prevent further degradation.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a strong reputation for quality and innovation, Cummins serves the automotive and heavy-duty truck industries with a comprehensive range of components. The company’s commitment to excellence is reflected in its products, including the 3863794 Hexagonal Flange Head Cap Screw, which is designed to meet the high standards required for heavy-duty applications.

Hexagonal Flange Head Cap Screw 3863794 in Cummins Engines

The Hexagonal Flange Head Cap Screw part number 3863794, manufactured by Cummins, is a critical component in various Cummins engine models. This screw is designed to provide secure fastening in applications where a robust and reliable connection is essential.

Application in Cummins Engines

4B3.9, 6B5.9, 6C8.3, QSB5.9 30 CM550, QSB5.9 44 CM550

In these engines, the 3863794 screw is often used in applications requiring high torque and durability. Its hexagonal flange head allows for easy and efficient tightening with a wrench, ensuring a secure fit that can withstand the operational stresses of the engine.

QSC8.3 CM850 (CM2850), QSC9 CM2250/QSL9 CM2250

For the QSC8.3 CM850 and QSC9 CM2250/QSL9 CM2250 engines, the 3863794 screw is integral in maintaining the structural integrity of various engine components. Its design ensures that critical parts remain fastened securely, contributing to the overall reliability and performance of the engine.

QSL8.9 CM2150 L141, QSL9 CM2250, QSL9 CM2350 L102, QSL9 CM850 (CM2850)

In these models, the screw is utilized in applications that demand precision and strength. The flange head design facilitates easy access and adjustment, making it a preferred choice for securing components in these engines. Its use in these engines underscores its versatility and importance in maintaining engine functionality.

The 3863794 screw’s application across these Cummins engines highlights its critical role in ensuring the engines’ operational integrity and performance.

Role of Part 3863794 Hexagonal Flange Head Cap Screw in Engine Systems

Housing

In engine systems, the housing serves as a protective enclosure for various components, ensuring they are shielded from external elements and contaminants. The part 3863794 hexagonal flange head cap screw plays a significant role in securing the housing to the engine frame or other structural elements. Its design allows for a robust connection, distributing load evenly across the flange, which enhances the stability and integrity of the housing. This secure attachment is essential for maintaining the alignment and operational efficiency of the enclosed components.

Flywheel

The flywheel is a pivotal component in engine systems, responsible for storing rotational energy and smoothing out the power delivery between the engine’s combustion cycles. The part 3863794 hexagonal flange head cap screw is often utilized in the assembly of the flywheel to the crankshaft or other connecting components. Its hexagonal flange head provides a broad surface area for torque application, ensuring that the flywheel is tightly and securely fastened. This secure attachment is vital for maintaining the flywheel’s balance and preventing any wobbling or misalignment, which could lead to inefficient energy transfer and potential damage to the engine.

Conclusion

The 3863794 Hexagonal Flange Head Cap Screw is a vital component in the automotive and heavy-duty truck industry, particularly in Cummins engines. Its design and functionality are tailored to meet the demanding requirements of heavy-duty applications, ensuring secure fastening and maintaining the structural integrity of various engine components. Proper installation, regular maintenance, and understanding its role in engine systems are crucial for optimal performance and longevity of the screw.