3254405
Hexagon Head Cap Screw
Cummins®

The Cummins 3254405 Hexagon Head Cap Screw is a specialized fastener designed for heavy-duty truck applications. Its purpose is to provide secure and reliable fastening in various truck components, ensuring the integrity and performance of the vehicle. The significance of this screw lies in its ability to withstand the demanding conditions encountered in heavy-duty truck operations, contributing to the overall durability and efficiency of the truck ¹.

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 easy tightening and loosening using a wrench or socket. The design of the screw includes a threaded shaft that engages with internal threads in the material being fastened, providing a strong and secure connection. In fastening applications, these screws are commonly used to join metal components, offering both strength and ease of use ².

Purpose and Role in Truck Operation

This Cummins part plays a specific role in the operation and maintenance of heavy-duty trucks. It is utilized in various truck components, such as engine mounts, chassis assemblies, and structural reinforcements. By providing a secure fastening solution, this screw helps maintain the structural integrity of the truck, ensuring that components remain firmly in place under the stress of heavy loads and rough conditions ³.

Key Features

The Cummins 3254405 Hexagon Head Cap Screw boasts several key features that contribute to its performance and durability. It is typically made from high-strength steel, offering enhanced resistance to wear and tear. The screw features a coarse thread type, which provides greater holding power in applications where high tensile strength is required. The hexagonal head design allows for efficient tightening and loosening, reducing the risk of stripping or rounding during use.

Benefits

Using this Cummins part offers several benefits. Its high-strength material composition ensures enhanced durability and resistance to corrosion, making it suitable for use in harsh environments. The screw’s design facilitates ease of installation, allowing for quick and secure fastening. Additionally, its robust construction contributes to the overall reliability and longevity of the truck components it secures.

Installation and Usage

Proper installation of the Cummins 3254405 Hexagon Head Cap Screw is crucial for ensuring optimal performance. It is recommended to use a torque wrench to achieve the specified torque settings, which vary depending on the application and material being fastened. Using the appropriate tools, such as a socket or wrench that fits the hexagonal head, ensures accurate and efficient tightening. Following manufacturer guidelines for installation helps prevent over-tightening or under-tightening, which can compromise the screw’s effectiveness.

Troubleshooting and Maintenance

Common issues associated with Hexagon Head Cap Screws include loosening over time due to vibration or thermal expansion, and corrosion in exposed applications. To address these issues, regular inspection and maintenance are recommended. Tightening screws periodically and applying anti-seize compound can help prevent loosening. In cases of corrosion, cleaning the affected area and reapplying a protective coating can extend the screw’s lifespan. Proper maintenance ensures the longevity and optimal performance of the fastening solution.

Safety Considerations

When working with Hexagon Head Cap Screws, it is important to follow safety practices to ensure personal protection and component integrity. Proper handling involves using the correct tools to avoid damage to the screw or surrounding components. Storage in a dry, corrosion-resistant environment prevents premature degradation. Usage precautions include adhering to torque specifications to avoid over-tightening, which can lead to component failure or screw breakage.

Cummins Overview

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 a reputation for innovation, quality, and reliability in the automotive and heavy-duty truck industry. The company’s commitment to excellence is reflected in its wide range of products, including the Cummins 3254405 Hexagon Head Cap Screw, which embodies the brand’s dedication to providing durable and high-performance solutions for demanding applications.

Hexagon Head Cap Screw (Part 3254405) in Cummins Engines

The Cummins part number 3254405, a Hexagon Head Cap Screw, is a critical component in various Cummins engine models. This screw is essential for securing different parts within the engine assembly, ensuring structural integrity and operational efficiency. Here is how it fits into the specified engines:

4B3.9, 6B5.9, and QSB5.9 44 CM550

In the 4B3.9, 6B5.9, and QSB5.9 44 CM550 engines, the Hexagon Head Cap Screw is used in several applications, including securing engine covers, brackets, and various internal components. Its robust design ensures that these parts remain firmly in place under the high stress and varying conditions encountered during engine operation.

6C8.3, QSC8.3 CM554, and QSC8.3 CM850(CM2850)

For the 6C8.3, QSC8.3 CM554, and QSC8.3 CM850(CM2850) engines, the Hexagon Head Cap Screw is utilized in the assembly of engine blocks, cylinder heads, and other critical components. The screw’s ability to withstand high torque and maintain its fastening properties over time is crucial for the longevity and reliability of these engines.

ISM CM570, ISM CM570/870, ISM CM876, ISM11 CM876 SN, and QSM11 CM570

In the ISM CM570, ISM CM570/870, ISM CM876, ISM11 CM876 SN, and QSM11 CM570 engines, the Hexagon Head Cap Screw is integral to the assembly of turbochargers, intake manifolds, and exhaust systems. These engines often operate under high loads, and the screw’s durability and strength are vital for maintaining the integrity of these systems.

L10 CELECT, L10 GAS, L10 MECHANICAL, M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL

For the L10 CELECT, L10 GAS, L10 MECHANICAL, M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL engines, the Hexagon Head Cap Screw is used in the assembly of fuel injection systems, engine mounts, and other critical components. The screw’s precision and reliability are essential for the smooth operation and performance of these engines.

N14 CELECT PLUS and QSB6.7 CM850(CM2850)

In the N14 CELECT PLUS and QSB6.7 CM850(CM2850) engines, the Hexagon Head Cap Screw is employed in the assembly of engine blocks, cylinder heads, and other structural components. Its ability to maintain fastening integrity under high stress and temperature variations is crucial for the performance and durability of these engines.

QSB7 CM2880 B117 and QSL9 CM554

For the QSB7 CM2880 B117 and QSL9 CM554 engines, the Hexagon Head Cap Screw is used in the assembly of various engine components, including those that are subject to high mechanical stress. The screw’s design ensures that these components remain securely fastened, contributing to the overall reliability and efficiency of the engines.

Role of Part 3254405 Hexagon Head Cap Screw in Engine Systems

This Cummins part is integral to the assembly and operation of various engine systems. Its primary function is to secure and maintain the integrity of connections and components within these systems.

In the aftercooler system, this screw is used to fasten components that facilitate the cooling of compressed air, ensuring efficient air temperature regulation.

For the alternator, it plays a role in securing the alternator to its designated location and mounting bracket. This ensures stable operation and prevents vibrations that could affect the alternator’s performance.

In the compressor and air connection systems, the screw is employed to maintain secure connections in the air intake and air transfer pathways. This is vital for maintaining pressure integrity and preventing leaks.

Within the coupling and fuel pump drive systems, the screw helps in securing the fuel pump, ensuring it operates smoothly without undue vibration.

The screw is also utilized in the flywheel assembly, contributing to the secure attachment of components and ensuring balanced rotation.

In fuel plumbing and the leak test kit, it aids in creating secure joints, which is essential for preventing fuel leaks and ensuring system integrity during testing.

For the electronic interface module and engine monitor mounting, the screw ensures these sensitive components are firmly attached, safeguarding them from damage due to engine vibrations.

In the oil pan kit and oil pan, it is used to secure the pan to the engine, preventing oil leaks and ensuring the pan remains intact under operational stress.

The screw is also found in air cleaner and crankcase breather plumbing, where it ensures that all connections are tight, promoting efficient airflow and preventing contaminants from entering the engine.

Additionally, in systems involving corrosion resistors and front engine support, the screw helps in maintaining the structural integrity of these components, ensuring they withstand the operational stresses of the engine environment.

Conclusion

The Cummins 3254405 Hexagon Head Cap Screw is a vital component in the assembly and maintenance of heavy-duty trucks and Cummins engines. Its robust design, high-strength material, and ease of use make it an essential fastener for securing various components under demanding conditions. Proper installation, regular maintenance, and adherence to safety practices ensure the longevity and reliability of this critical part.