3558921
Hexagon Head Cap Screw
Cummins®

The Hexagon Head Cap Screw, Part #3558921, manufactured by Cummins, is a specialized fastener designed for use in heavy-duty truck components. This screw is integral to ensuring the secure assembly of various truck parts, contributing to the overall reliability and performance of the vehicle.

Basic Concepts of Hexagon Head Cap Screws

Hexagon Head Cap Screws are a type of fastener characterized by a hexagonal head, which allows for efficient tightening and loosening using a wrench or socket. These screws function by providing a strong, threaded connection between components, distributing load and preventing movement. In the automotive industry, they are commonly used for their durability and ease of installation in applications requiring secure fastening ¹.

Purpose of the 3558921 Hexagon Head Cap Screw in Truck Operation

The 3558921 Hexagon Head Cap Screw plays a specific role in the operation of heavy-duty trucks by securely fastening critical components. Its design ensures that parts remain firmly in place under various operating conditions, which is vital for the safe and efficient performance of the truck. Secure fastening is particularly important in heavy-duty applications where vibrations and loads can cause components to loosen over time ².

Key Features of the 3558921 Hexagon Head Cap Screw

The 3558921 Hexagon Head Cap Screw features a robust design with a hexagonal head for easy manipulation with tools. It is composed of high-strength materials, ensuring durability and resistance to wear. Additionally, the screw may have unique attributes such as a corrosion-resistant coating, which enhances its performance in harsh environments typical of heavy-duty truck operations ³.

Benefits of Using the 3558921 Hexagon Head Cap Screw

Using the 3558921 Hexagon Head Cap Screw offers several benefits, including improved reliability due to its strong fastening capabilities. The screw’s design allows for ease of installation, reducing downtime during maintenance. Its resistance to wear and corrosion contributes to the longevity of truck components, ensuring they perform optimally over extended periods.

Installation and Usage Guidelines

Proper installation of the 3558921 Hexagon Head Cap Screw involves several steps to ensure a secure and effective fastening. Begin by aligning the screw with the designated hole in the component. Use a wrench or socket to tighten the screw to the recommended torque specification, which ensures the screw is adequately secured without over-tightening. Follow best practices for installation to maintain the integrity of the fastening.

Troubleshooting Common Issues

Common issues with the 3558921 Hexagon Head Cap Screw may include loosening, corrosion, or damage. To address these problems, first, inspect the screw and surrounding components for signs of wear or damage. If corrosion is present, clean the affected area and apply a corrosion-resistant treatment. In cases of damage, replace the screw with a new one to maintain secure fastening. Regular inspections can help identify and resolve issues before they lead to more significant problems.

Maintenance Tips

To prolong the lifespan of the 3558921 Hexagon Head Cap Screw, perform regular inspections to check for signs of wear, corrosion, or loosening. Clean the screw and surrounding areas to remove dirt and debris that can contribute to corrosion. Applying a lubricant to the threads can also help prevent seizing and make future removal easier. These maintenance practices ensure the screw continues to perform reliably over time.

Cummins: A Brief Overview

Cummins Inc. is a renowned manufacturer in the automotive and heavy-duty truck industry, known for its commitment to quality and innovation. The company offers a wide range of products, including engines, filtration systems, and aftermarket parts. Cummins’ reputation for producing reliable and high-performance components makes it a trusted name in the industry, ensuring that parts like the 3558921 Hexagon Head Cap Screw meet the demanding requirements of heavy-duty applications.

Hexagon Head Cap Screw 3558921 Compatibility with Cummins Engines

The Hexagon Head Cap Screw part number 3558921, manufactured by Cummins, is a versatile component designed to fit a variety of Cummins engines. This screw is integral in securing various parts and assemblies within the engine, ensuring structural integrity and operational efficiency.

Cummins Medium-Duty Engines

• 6B5.9: This engine benefits from the screw’s secure fastening capabilities in several critical applications.
• B5.9 G: The screw is used in specific mounting and fastening tasks within this engine model.
• C GAS PLUS CM556: The part is utilized in securing components that require precise alignment and stability.
• C8.3 G: The screw aids in fastening parts that are subject to high stress and vibration.
• QSB5.9 44 CM550: This engine incorporates the screw in various fastening applications, ensuring parts remain securely in place.
• QSC8.3 CM554: The screw is used to secure components that need to withstand high temperatures and pressures.

Cummins Heavy-Duty Engines

• 4B3.9: The screw is employed in fastening parts that are critical to the engine’s performance and durability.
• 6C8.3: This engine uses the screw in several fastening applications, ensuring that components remain securely attached.
• ISB CM550: The screw is utilized in securing parts that require high strength and durability.
• ISC CM554: The part is used in fastening components that are subject to significant mechanical stress.
• ISL CM554: The screw aids in securing parts that need to maintain their position under varying operational conditions.
• ISM CM570: The screw is used in fastening applications that require high precision and reliability.
• ISX CM570: This engine incorporates the screw in several critical fastening tasks, ensuring parts remain securely attached.
• QSK45 CM500: The screw is used in fastening components that need to withstand high operational stresses.
• QSK60 CM500: The part is utilized in securing parts that require high strength and durability.

Cummins High-Horsepower Engines

• K38: The screw is used in fastening parts that are critical to the engine’s performance and durability.
• K50: This engine employs the screw in several fastening applications, ensuring components remain securely attached.

Cummins Medium-Duty and Heavy-Duty Engines

• L10 CELECT: The screw is used in fastening parts that require high strength and durability.
• L10 GAS: This engine incorporates the screw in several critical fastening tasks, ensuring parts remain securely attached.
• M11 CELECT: The screw is utilized in securing components that need to withstand high operational stresses.
• M11 CELECT PLUS: The part is used in fastening applications that require high precision and reliability.
• M11 MECHANICAL: The screw aids in securing parts that need to maintain their position under varying operational conditions.
• N14 CELECT PLUS: This engine uses the screw in several fastening applications, ensuring that components remain securely attached.
• N14 MECHANICAL: The screw is employed in fastening parts that are critical to the engine’s performance and durability.

Cummins Industrial Engines

• NH/NT 855: The screw is used in fastening parts that require high strength and durability.

The Hexagon Head Cap Screw 3558921 is a critical component in maintaining the structural integrity and operational efficiency of these Cummins engines. Its use across a wide range of engine models underscores its versatility and importance in the engine assembly process.

Role of Part 3558921 Hexagon Head Cap Screw in Various Components

Air Compressor and Air Compressor Kit

This Cummins part is utilized in the construction and maintenance of air compressors and air compressor kits. It secures various components within the assembly, ensuring stability and proper function of the compressor. This screw is integral in attaching the compressor’s housing to its base, maintaining alignment and preventing vibrations during operation.

QE Unloader Series Assemblies

In the QE Unloader Series Assemblies, including the QE Unloader, QE Unloader SER, and QE Unloader SERV, the Hexagon Head Cap Screw plays a significant role. It is employed to fasten the unloader valve to the compressor head, ensuring a secure connection that is vital for the regulation of air pressure. The screw’s design allows for easy adjustment and maintenance, contributing to the overall efficiency of the unloader system.

Compressor Conversion Kit

Within the Compressor Conversion Kit, the Hexagon Head Cap Screw is used to attach and secure various components that are essential for converting the compressor to different specifications or functions. This includes fastening adapter plates, mounting brackets, and other critical parts that facilitate the conversion process.

Head Assemblies

Across different head assemblies such as HD/B, HD/C, HD/M, HD/STD, QE/B, QE/C, QE/M, and QE/STD, the Hexagon Head Cap Screw is a common fastening element. It is responsible for securing the head to the compressor body, ensuring a tight seal and proper alignment. This is essential for the efficient operation of the compressor, as any misalignment or looseness can lead to performance issues or damage.

QE Head Assembly

In the QE Head Assembly, the Hexagon Head Cap Screw is used to secure the head to the compressor, ensuring that all internal components are properly aligned and sealed. This assembly is particularly sensitive to the fastening method, as it directly impacts the compressor’s ability to maintain pressure and deliver consistent performance.

Overall, the Hexagon Head Cap Screw (Part 3558921) is a versatile and essential component in the assembly and maintenance of various air compressor systems. Its role in securing and aligning critical parts ensures the reliability and efficiency of the compressor.

Conclusion

The 3558921 Hexagon Head Cap Screw is a vital component in the assembly and maintenance of heavy-duty truck components and various air compressor systems. Its robust design, ease of installation, and resistance to wear and corrosion make it an essential part for ensuring the reliability and performance of these systems. Proper installation, regular maintenance, and timely replacement are key to maximizing the lifespan and effectiveness of this Cummins part.