3943682
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3943682, is a specialized fastener produced by Cummins, a renowned manufacturer in the automotive and heavy-duty truck industry. This screw is integral to the maintenance and operation of commercial trucks, offering a reliable solution for fastening various components within these vehicles.

Basic Concepts

A Hexagon Flange Head Cap Screw is characterized by its hexagonal head and flanged base. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area to distribute load and prevent the screw from sinking into the material. This design ensures secure fastening and is commonly used in mechanical systems where stability and strength are paramount ¹.

Purpose and Role in Truck Operation

The 3943682 Hexagon Flange Head Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is utilized in various truck components, including engine assemblies, chassis structures, and body panels. By securely fastening these components, the screw contributes to the overall structural integrity and performance of the truck. Its application ensures that parts remain firmly in place, even under the demanding conditions encountered in commercial trucking ².

Key Features

The 3943682 Hexagon Flange Head Cap Screw boasts several key features that enhance its performance and durability. Its hexagonal head design facilitates easy and precise torque application, while the flange provides additional stability and load distribution. The screw is crafted from high-quality materials, ensuring resistance to corrosion and wear, which is vital for long-term reliability in the harsh environments typical of commercial trucking ³.

Benefits

The benefits of using the 3943682 Hexagon Flange Head Cap Screw include improved torque application, resistance to loosening, and enhanced structural integrity in fastening applications. The screw’s design allows for efficient tightening and secure fastening, reducing the risk of component failure. Its resistance to loosening ensures that fastened parts remain secure over time, even under vibration and dynamic loads. Additionally, the screw’s robust construction contributes to the overall durability and reliability of truck components.

Installation and Usage

Proper installation of the 3943682 Hexagon Flange Head Cap Screw is crucial for optimal performance and longevity. It is recommended to use the appropriate torque specifications provided by the manufacturer to ensure secure fastening without over-tightening, which could lead to damage. Best practices include cleaning the installation surface to remove any debris or contaminants that could affect the screw’s grip and using a torque wrench for precise application.

Troubleshooting and Maintenance

Common issues associated with Hexagon Flange Head Cap Screws include loosening over time and corrosion. Regular inspection and maintenance can help identify and address these issues promptly. If a screw shows signs of loosening, it should be re-tightened to the specified torque. In cases of corrosion, the affected screw may need to be replaced to ensure continued reliable performance. Adhering to maintenance schedules and using corrosion-resistant coatings can prolong the lifespan of the screw.

Manufacturer - Cummins

Cummins is a leading manufacturer in the automotive and heavy-duty truck industry, known for its commitment to producing high-quality components. With a rich history and a strong reputation for reliability and innovation, Cummins continues to be a trusted name in the industry. The company’s dedication to excellence is reflected in its wide range of products, including the 3943682 Hexagon Flange Head Cap Screw, which is designed to meet the demanding requirements of commercial trucking applications.

Hexagon Flange Head Cap Screw 3943682 in Cummins Engines

The Hexagon Flange Head Cap Screw 3943682, manufactured by Cummins, is a critical component in several of their engine models. This screw is designed to secure various parts within the engine, ensuring structural integrity and operational efficiency. Below is a detailed look at how this part integrates with different Cummins engines.

ISB Series Engines

• ISB CM550: The 3943682 screw is used in securing the cylinder head cover, ensuring a tight seal and preventing leaks.
• ISB CM850: This screw plays a pivotal role in fastening the engine’s accessory drive system, which includes components like the alternator and water pump.

ISC Series Engines

• ISC CM850: Here, the screw is utilized in the assembly of the turbocharger system, ensuring that all parts are securely fastened.
• ISC8.3 CM2250: The 3943682 screw is integral in securing the engine’s intake manifold, which is crucial for maintaining proper air-fuel mixture.

ISL Series Engines

• ISL9 CM2150 SN: This screw is used in the assembly of the engine’s fuel injection system, ensuring that all components are tightly secured.
• ISL9 CM2250: The screw is employed in fastening the engine’s exhaust manifold, which is essential for efficient exhaust gas management.
• ISL9.5 CM2880 L138: Here, the screw is used in securing the engine’s oil pan, which is vital for containing the engine oil and preventing leaks.

L Series Engines

• L8.9 CM2670 L134C: The 3943682 screw is used in the assembly of the engine’s valve cover, ensuring that all parts are securely fastened.
• L9 CM2670 L128B: This screw is utilized in fastening the engine’s timing cover, which is crucial for maintaining the timing of the engine’s internal components.

QSB Series Engines

• QSB3.9 30 CM550: The screw is used in securing the engine’s accessory drive system, ensuring that all components are tightly fastened.
• QSB5.9 30 CM550: Here, the screw is employed in fastening the engine’s oil pan, which is essential for containing the engine oil and preventing leaks.
• QSB5.9 44 CM550: The screw is used in securing the engine’s turbocharger system, ensuring that all parts are tightly fastened.

QSC Series Engines

• QSC8.3 CM2880 C102: The 3943682 screw is used in securing the engine’s intake manifold, which is crucial for maintaining proper air-fuel mixture.
• QSC8.3 CM850 (CM2850): This screw is utilized in fastening the engine’s exhaust manifold, which is essential for efficient exhaust gas management.
• QSC9 CM2250 / QSL9 CM2250: The screw is used in securing the engine’s fuel injection system, ensuring that all components are tightly fastened.

QSL Series Engines

• QSL8.9 CM2150 L141: The screw is used in securing the engine’s oil pan, which is vital for containing the engine oil and preventing leaks.
• QSL9 CM2250: Here, the screw is employed in fastening the engine’s turbocharger system, ensuring that all parts are tightly fastened.
• QSL9 CM850 (CM2850): The screw is used in securing the engine’s accessory drive system, ensuring that all components are tightly fastened.
• QSL9.3 CM2880 L113: This screw is utilized in fastening the engine’s valve cover, ensuring that all parts are securely fastened.

Hexagon Flange Head Cap Screw in Engine Systems

The Hexagon Flange Head Cap Screw (part 3943682) is a vital fastener in various engine systems, ensuring secure and reliable connections across multiple components. Its application spans several key areas within the engine, contributing to the overall integrity and performance of the system.

Turbocharger Arrangement

In the turbocharger arrangement, the Hexagon Flange Head Cap Screw is used to fasten the turbocharger to the engine block or manifold. This secure attachment is essential for maintaining the turbocharger’s position and ensuring it operates within the designed parameters. The screw’s flange head provides additional surface area, enhancing the fastening strength and reducing the risk of loosening under high vibrations and thermal cycles.

Air Intake and Manifold Connections

The screw plays a significant role in the air intake system, particularly in securing the air intake manifold to the engine block. This connection is vital for maintaining a sealed pathway for air to enter the combustion chamber. The flange head of the screw helps distribute the clamping force more evenly, preventing leaks and ensuring optimal airflow.

Intake Connection and Mounting

For the intake connection, the Hexagon Flange Head Cap Screw is employed to mount the intake manifold to the engine. This secure mounting is crucial for the manifold’s stability and alignment, directly impacting the engine’s air-fuel mixture and overall performance. The screw’s design allows for easy tightening and removal, facilitating maintenance and adjustments.

Air Transfer and Turbocharger Connections

In air transfer applications, the screw is used to connect various components within the air intake system, such as intercoolers and charge pipes to the turbocharger. These connections must withstand high pressure and temperature fluctuations, making the robust design of the Hexagon Flange Head Cap Screw particularly suitable. Its ability to provide a tight seal helps maintain efficient air transfer, contributing to better engine performance.

Manifold and Air Intake Mounting

Finally, the screw is instrumental in mounting the air intake manifold to the engine block. This mounting ensures that the manifold remains firmly in place, even under the dynamic conditions of engine operation. The flange head of the screw enhances the clamping force, reducing the likelihood of manifold displacement or detachment.

Overall, the Hexagon Flange Head Cap Screw (part 3943682) is a fundamental component in ensuring the secure and efficient operation of various engine systems, from turbochargers to air intake manifolds. Its design and functionality make it an indispensable part of modern engine assemblies.

Conclusion

The 3943682 Hexagon Flange Head Cap Screw is a critical component in the maintenance and operation of commercial trucks and Cummins engines. Its design, featuring a hexagonal head and flanged base, ensures secure fastening and efficient torque application. The screw’s key features, including resistance to corrosion and wear, contribute to its long-term reliability in harsh environments. Proper installation and regular maintenance are essential for optimal performance and longevity. Cummins’ commitment to quality and innovation is evident in the design and functionality of this part, making it an indispensable component in modern engine assemblies.