3904446
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw, identified by part number 3904446, is a critical component in commercial truck applications, especially in heavy-duty trucks. This screw is essential for the assembly and maintenance of various truck components. Cummins, a renowned manufacturer in the automotive industry, produces this part. Known for their commitment to quality and innovation, Cummins has a long-standing reputation for manufacturing reliable truck components ³.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flanged base. The hexagonal head allows for efficient torque application using standard tools, while the flange provides a larger bearing surface that helps distribute load and resist loosening. These screws are typically made from materials such as alloy steel, which offer a balance of strength and durability ⁴. In mechanical systems, they serve to securely fasten components together, ensuring structural integrity and reliable performance.

Purpose and Function

The 3904446 Hexagon Flange Head Cap Screw is designed to contribute to the assembly and maintenance of truck components. It is used in applications where secure fastening is required, such as joining metal parts in the truck’s frame, engine, or other critical areas. By providing a strong and stable connection, this screw helps maintain the structural integrity of the truck, ensuring safe and efficient operation ¹.

Key Features

The 3904446 Hexagon Flange Head Cap Screw features a hexagonal head that allows for precise torque application, ensuring that the screw is tightened to the correct specification. The flange at the base of the screw provides additional surface area, which helps distribute the load and resist loosening over time. These features enhance the screw’s performance and ease of use, making it a reliable choice for heavy-duty applications ².

Benefits

Using the 3904446 Hexagon Flange Head Cap Screw offers several benefits. The design of the hexagonal head allows for efficient and accurate torque application, which is crucial for maintaining the integrity of the fastened components. The flange provides additional resistance to loosening, which is particularly important in dynamic environments where vibrations and movements are common. Additionally, the material and construction of the screw contribute to its durability, ensuring long-lasting performance even in harsh conditions ³.

Troubleshooting and Maintenance

Common issues associated with Hexagon Flange Head Cap Screws include loosening over time due to vibrations or insufficient torque during installation. To troubleshoot these issues, it is important to ensure that the screw is tightened to the manufacturer’s specified torque settings. Regular inspections should be conducted to check for signs of loosening or wear. Maintenance tips include using the appropriate tools for installation and torque application, and periodically re-tightening the screws as needed to maintain secure fastening ⁴.

Manufacturer Information

Cummins is a reputable manufacturer with a strong history in the automotive industry. They are known for their commitment to quality and innovation in manufacturing truck components. Cummins’ reputation is built on their ability to produce reliable and durable parts that meet the demanding requirements of commercial and heavy-duty truck applications. Their focus on quality ensures that components like the 3904446 Hexagon Flange Head Cap Screw are designed to perform well under various conditions, providing truck operators with confidence in their equipment ¹.

Compatibility with Cummins Engines

The Hexagon Flange Head Cap Screw part number 3904446, manufactured by Cummins, is a versatile component designed to fit a variety of Cummins engines. This screw is integral in securing various engine parts, ensuring structural integrity and operational efficiency. Below is a detailed breakdown of its compatibility with different Cummins engines:

4B3.9, 6B5.9, 6C8.3, B3.9 G, B4.5, B4.5 CM2350 B129B, B5.6 CM2670 B152B, B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556, B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, B6.7S, C GAS PLUS CM556, C8.3 G, D4.0 CM2620 D103B

These engines, ranging from 4B3.9 to C8.3 G, utilize the 3904446 screw in several critical applications. The screw’s design allows it to securely fasten components such as engine covers, brackets, and other structural parts, ensuring they remain tightly in place during operation. This is particularly important in maintaining the engine’s overall performance and longevity ².

F3.8 CM2350 F120B, F3.8 CM2350 F128C, F3.8 CM2620 F137B, F3.8 F102, F4.5 CM2620 F139B, F4.5 CM2620 F141C

The F3.8 and F4.5 series engines also benefit from the use of the 3904446 screw. In these engines, the screw is often used to secure various components that require a robust and reliable fastening solution. Its flange head design provides a larger surface area for the application of torque, ensuring that the screw can withstand the stresses of engine operation ³.

G5.9

The G5.9 engine is another application where the 3904446 screw is used. This engine, like others in the Cummins lineup, relies on the screw to maintain the integrity of its components. The screw’s ability to provide a tight and secure fit is crucial for the engine’s performance and durability ⁴.

Component Usage

The Hexagon Flange Head Cap Screw, identified by part number 3904446, is a versatile fastener utilized in various engine systems to ensure secure and reliable connections. Its application spans across multiple components, contributing to the overall integrity and functionality of the engine.

Air Compressor Support

In the air compressor support system, the Hexagon Flange Head Cap Screw is employed to fasten the support brackets securely. This ensures that the air compressor remains stable and aligned, which is essential for efficient air compression and delivery ¹.

Alternator and Alternator Drive

For the alternator and its drive mechanism, this screw plays a role in attaching the alternator to the engine block or mounting bracket. It also secures the alternator drive components, ensuring that the alternator operates smoothly and generates consistent electrical output ².

Thermostat Housing and Auxiliary Pump

Within the thermostat housing and auxiliary pump assemblies, the Hexagon Flange Head Cap Screw is used to fasten the housing components together. This secure attachment is vital for maintaining the integrity of the cooling system and ensuring proper fluid flow ³.

Belt Tensioner Kit and Compressor

In the belt tensioner kit and compressor systems, this screw is crucial for securing the tensioner assembly and compressor components. Proper tensioning of belts is essential for the efficient operation of pulleys and driven components, while secure compressor mounting ensures optimal performance ⁴.

Cam Follower and Cylinder Head

The cam follower and cylinder head assemblies benefit from the use of this screw to fasten various components. Secure attachment of these parts is necessary for precise valve operation and overall engine performance ¹.

Heat Exchanger and Fuel Pump

In the heat exchanger and fuel pump systems, the Hexagon Flange Head Cap Screw is utilized to fasten the housing and mounting brackets. This ensures that these critical components remain securely in place, contributing to efficient heat exchange and consistent fuel delivery ².

Exhaust Manifold and Flywheel Housing

The exhaust manifold and flywheel housing assemblies also incorporate this screw to secure their respective components. This ensures that the exhaust system operates efficiently and that the flywheel remains properly aligned for smooth engine operation ³.

Thermostat Housing and Muffler

Finally, in the thermostat housing and muffler systems, the Hexagon Flange Head Cap Screw is used to fasten the housing and mounting brackets. This secure attachment is essential for maintaining the integrity of the cooling system and ensuring efficient exhaust flow ⁴.

Conclusion

Overall, the Hexagon Flange Head Cap Screw (part 3904446) is a fundamental component in various engine systems, providing the necessary secure connections to ensure optimal performance and reliability. Its design, material, and application make it a critical part in the assembly and maintenance of Cummins engines and other heavy-duty truck components.