3678694
Hexagon Flange Head Cap Screw
Cummins®

The Cummins Hexagon Flange Head Cap Screw, identified by part number 3678694, is a specialized fastener designed for heavy-duty truck applications. This screw provides secure fastening solutions that withstand the rigors of commercial trucking environments. Cummins, a renowned manufacturer in the automotive and heavy-duty truck industry, ensures that this component meets the high standards required for reliable performance in demanding conditions.

Basic Concepts

A Hexagon Flange Head Cap Screw is characterized by its hexagonal head and a flange that sits against the surface being fastened. This design allows for efficient tightening using a wrench or socket, while the flange distributes the load and prevents the screw from pulling through the material. In fastening applications, this screw is used to join components securely, ensuring structural integrity and stability.

Purpose and Role in Truck Operation

The 3678694 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 mounts, chassis assemblies, and body panels. By providing a strong and stable connection, this screw helps maintain the alignment and integrity of critical truck parts, contributing to overall vehicle performance and safety.

Key Features

The 3678694 Hexagon Flange Head Cap Screw boasts several key features that enhance its functionality. Its hexagonal flange head design allows for easy and precise tightening. The screw is made from high-quality materials, ensuring durability and resistance to corrosion. Additionally, it features specific threading specifications that provide a secure fit and optimal load distribution.

Benefits

The 3678694 Hexagon Flange Head Cap Screw offers numerous benefits. Its design enhances fastening security, making it less likely for the screw to loosen over time. The screw’s resistance to vibration loosening ensures that connections remain tight even under dynamic conditions. Furthermore, its durability in harsh operating conditions makes it an ideal choice for heavy-duty truck applications.

Installation Guidelines

Proper installation of the 3678694 Hexagon Flange Head Cap Screw is vital for optimal performance. Begin by ensuring the mating surfaces are clean and free of debris. Use a wrench or socket to tighten the screw gradually, applying even pressure. Adhere to the specified torque settings to avoid over-tightening, which can damage the screw or the components being fastened. Regularly check the tightness of the screw to maintain secure connections.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion. To troubleshoot, inspect the screw and surrounding components for signs of wear or damage. If corrosion is present, clean the affected areas and apply a suitable anti-corrosive treatment. Regular maintenance involves checking the tightness of the screw and ensuring that all connections remain secure. Replace any damaged or worn screws promptly to prevent further issues.

Safety Considerations

When working with Hexagon Flange Head Cap Screws, it is important to follow safety guidelines to prevent accidents and injuries. Use the appropriate tools for installation and removal to avoid slipping and potential harm. Store screws in a dry, organized environment to prevent corrosion and damage. Always wear protective gear, such as gloves and safety glasses, when handling fasteners to protect against injuries.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history dating back to 1919, Cummins has established a strong reputation for innovation, quality, and reliability. The company offers a wide range of products for various industries, including automotive, heavy-duty trucking, and industrial applications. Cummins’ commitment to excellence ensures that their components, like the 3678694 Hexagon Flange Head Cap Screw, meet the highest standards of performance and durability ¹.

Cummins Hexagon Flange Head Cap Screw (Part 3678694) in Engine Applications

The Cummins Hexagon Flange Head Cap Screw, part number 3678694, is a critical component in the assembly and maintenance of several Cummins engine models. This screw is designed to provide a secure fastening solution, ensuring that various engine parts remain tightly connected under operational stresses.

Application in Cummins Engines

6C8.3

In the 6C8.3 engine, the 3678694 screw is utilized in several key areas, including securing the cylinder head to the engine block. This ensures that the combustion chamber remains sealed and operational integrity is maintained.

ISX CM570

For the ISX CM570 engine, the 3678694 screw plays a vital role in fastening various components, such as the turbocharger housing and other critical engine parts. Its design allows for reliable fastening in high-stress environments, ensuring the engine’s performance and longevity.

QSC8.3 CM850 (CM2850)

In the QSC8.3 CM850 (CM2850) engine, this screw is used in similar applications as in the ISX CM570, including securing the turbocharger housing and other critical engine components. The robust design of the screw ensures that it can withstand the operational stresses of this engine model.

Grouping of Engines

The 3678694 screw is integral to the assembly and maintenance of the ISX CM570 and QSC8.3 CM850 (CM2850) engines, which are part of Cummins’ medium-duty and heavy-duty engine lineup. These engines are known for their durability and performance, and the use of high-quality fasteners like the 3678694 screw is essential for maintaining their operational integrity ².

Role of Part 3678694 Hexagon Flange Head Cap Screw in Engine Systems

The part 3678694 hexagon flange head cap screw is integral to the assembly and operation of several key components within engine systems. Its design and function facilitate secure fastening and reliable performance across various engine parts.

Crankshaft Pulley

In the crankshaft pulley system, the hexagon flange head cap screw ensures the pulley is firmly attached to the crankshaft. This secure attachment is essential for the efficient transfer of rotational force from the crankshaft to the pulley, which in turn drives accessories like the alternator, power steering pump, and air conditioning compressor. The screw’s flange head provides additional surface area for torque application, enhancing the stability and durability of the connection.

Cylinder Block

Within the cylinder block, these screws are often used to fasten various components such as sensor brackets, mounting plates, and auxiliary parts. The flange head design allows for better distribution of clamping force, reducing the risk of component loosening under engine vibrations and thermal expansions. This reliability is vital for maintaining the integrity of the cylinder block and ensuring consistent engine performance.

Front Drive Adapter

The front drive adapter, which connects the crankshaft to the front accessories, relies on hexagon flange head cap screws to maintain a robust and vibration-resistant connection. These screws help in withstanding the dynamic loads and torque fluctuations transmitted through the adapter, ensuring smooth operation of front-mounted engine accessories.

Front Gear Housing

In the front gear housing, these screws play a role in securing the housing to the engine block or other structural components. The flange head provides enhanced torque application, which is crucial for maintaining the alignment and structural integrity of the gear housing. This secure fastening prevents misalignment and potential damage to the internal gears and bearings, contributing to the overall reliability of the engine system ³.

Conclusion

The Cummins Hexagon Flange Head Cap Screw, part number 3678694, is a critical component in the assembly and maintenance of heavy-duty truck engines and components. Its robust design, resistance to corrosion, and secure fastening capabilities make it an essential part for ensuring the reliability and performance of commercial trucks. Proper installation, regular maintenance, and adherence to safety guidelines are vital for maximizing the benefits of this screw in demanding applications.