4026355
Captive Washer Cap Screw
Cummins®

The Captive Washer Cap Screw, identified by Part #4026355 and manufactured by Cummins, is a specialized fastener designed for use in heavy-duty truck maintenance. Cummins, a well-established name in the automotive and heavy-duty truck industry, produces this component to meet the rigorous demands of truck assembly and maintenance. This screw is integral to ensuring the secure fastening of various components within heavy-duty trucks, contributing to the overall reliability and performance of the vehicle.

Basic Concepts

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer, which is held in place by a protrusion or step on the screw’s shank. This design ensures that the washer remains attached to the screw, preventing loss during installation and providing consistent and reliable fastening. The 4026355 Captive Washer Cap Screw by Cummins is engineered with precision to function effectively within a truck’s assembly, offering a streamlined solution for fastening applications ¹.

Purpose and Role

The 4026355 Captive Washer Cap Screw plays a significant role in the operation and maintenance of heavy-duty trucks by securely fastening components and assemblies. Its design allows for efficient and reliable connections, which are vital for the structural integrity and performance of the truck. This screw is commonly used in applications where consistent pressure distribution and secure fastening are required, such as in engine components, chassis parts, and various mechanical assemblies ².

Key Features

The 4026355 Captive Washer Cap Screw boasts several key features that enhance its functionality and durability. These include a precision-machined shank for accurate threading, a captive washer that ensures consistent pressure distribution, and a corrosion-resistant coating that extends the screw’s lifespan in harsh environments. The design of the screw also incorporates a hex-shaped head for easy installation and removal using standard tools ³.

Benefits

Utilizing the 4026355 Captive Washer Cap Screw offers several advantages. It improves assembly efficiency by eliminating the need for separate washers, reducing the risk of washer loss, and streamlining the fastening process. The integrated washer enhances the security of fastened components by providing uniform pressure distribution, which is crucial for maintaining the integrity of truck assemblies. Additionally, the durable construction and corrosion-resistant coating contribute to potential cost savings over time by reducing the need for frequent replacements.

Installation Process

Proper installation of the 4026355 Captive Washer Cap Screw involves several steps to ensure optimal performance and longevity. Begin by selecting the appropriate drill bit size for the pilot hole, ensuring it matches the screw’s diameter. Drill the pilot hole at the desired location, taking care to maintain perpendicular alignment. Next, insert the screw into the pilot hole and use a torque wrench to tighten it to the manufacturer’s specified torque settings. Avoid over-tightening, as this can damage the screw or the fastened components. Regularly inspect the screw for signs of wear or corrosion and replace it if necessary to maintain secure fastening.

Troubleshooting and Maintenance

Common issues with the 4026355 Captive Washer Cap Screw may include loosening over time, corrosion, or damage to the screw or washer. To address these issues, regularly inspect the screw and surrounding components for signs of wear or corrosion. If loosening is detected, re-tighten the screw to the specified torque settings. In cases of significant corrosion or damage, replace the screw with a new one to ensure continued secure fastening. Maintaining a clean and dry environment around the screw can also help prevent corrosion and extend its lifespan.

Compatibility and Applications

The 4026355 Captive Washer Cap Screw is designed for use in a variety of applications within heavy-duty trucks. It is commonly employed in engine components, chassis parts, and mechanical assemblies where secure and reliable fastening is required. When selecting this screw for a specific application, consider the material compatibility, environmental conditions, and mechanical stresses the screw will encounter to ensure optimal performance and longevity.

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 extensive product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of heavy-duty applications. Cummins’ commitment to excellence and customer satisfaction has made it a trusted name in the industry.

Captive Washer Cap Screw 4026355 in Cummins Engines

The Captive Washer Cap Screw 4026355, manufactured by Cummins, is a critical component in several of their engine models. This part is designed to secure various engine parts, ensuring stability and integrity during operation. Here is a breakdown of how this part integrates with different Cummins engine models:

G855 Series

• G855
• G855 CM558
• GTA855 CM558 (CM2358)

In the G855 series, the Captive Washer Cap Screw 4026355 is utilized to fasten components that require a secure and reliable connection. This includes securing engine mounts, brackets, and other structural elements that are crucial for maintaining the engine’s alignment and performance.

N14 Series

• N14 CELECT PLUS
• N14 G
• N14 MECHANICAL

For the N14 series engines, the 4026355 part plays a pivotal role in fastening various parts of the engine. It is commonly used in securing the engine block, cylinder heads, and other critical components that need to be tightly fastened to ensure optimal engine performance and longevity.

NH/NT 855 Series

• NH/NT 855

In the NH/NT 855 engines, the Captive Washer Cap Screw 4026355 is employed to secure several engine parts, including those that are integral to the engine’s operation and structural integrity. This part ensures that all fastened components remain stable under operational stresses.

QSN14 CM876 N103

For the QSN14 CM876 N103 engine, the 4026355 part is used to fasten various engine components that require a high level of security and precision. This includes parts that are critical to the engine’s overall performance and reliability.

The Captive Washer Cap Screw 4026355 is a versatile component that is essential for maintaining the structural integrity and performance of these Cummins engines. Its application across various engine models underscores its importance in ensuring that all fastened parts remain secure and stable during operation.

Role of Part 4026355 Captive Washer Cap Screw in Engine Systems

The 4026355 Captive Washer Cap Screw is integral to the secure assembly and maintenance of various engine components. It is specifically designed to provide a reliable fastening solution that ensures components remain firmly in place under the demanding conditions of engine operation.

Fuel System Integration

In the fuel system, the 4026355 Captive Washer Cap Screw is used to mount the fuel filter bracket. This secure attachment is essential for maintaining the structural integrity of the fuel filter, ensuring it remains stable and correctly aligned within the engine bay. The screw’s design prevents the washer from falling out, which enhances the reliability of the connection.

Oil System Applications

Within the oil system, this screw plays a significant role in the assembly of the oil pan and its associated components. It is employed in the mounting of the oil pan, ensuring that it is securely fastened to the engine block. This is particularly important during engine vibrations and high-performance scenarios, where the oil pan must remain stable to prevent oil leaks and maintain proper lubrication.

Additionally, the 4026355 Captive Washer Cap Screw is utilized in the oil pan service kit. During maintenance or repair procedures, this screw ensures that all components of the oil pan are correctly reassembled, providing a leak-proof seal and maintaining the efficiency of the oil circulation system.

Plumbing and Structural Support

Beyond its use in fuel and oil systems, the 4026355 Captive Washer Cap Screw is also vital in the plumbing of various engine components. It secures connections that are critical for the flow of fluids within the engine, ensuring that all plumbing is tight and free from leaks.

Conclusion

In summary, the 4026355 Captive Washer Cap Screw is a versatile and reliable fastening component that enhances the performance and durability of engine systems by ensuring secure and stable connections across a range of critical applications. Its integration into various Cummins engine models underscores its importance in maintaining the structural integrity and operational efficiency of heavy-duty trucks.