4022821
Captive Washer Cap Screw
Cummins®

The Captive Washer Cap Screw, specifically Part #4022821 by Cummins, is a specialized fastener designed for heavy-duty truck applications. Cummins, a well-established manufacturer in the automotive industry, produces this component to meet the rigorous demands of heavy-duty trucking. This screw plays a role in ensuring the reliability and durability of truck assemblies.

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 on the underside of the screw head. This design ensures that the washer remains attached to the screw, preventing loss during installation and providing consistent pressure distribution across the fastened components. In mechanical assemblies, these screws are used to secure parts together while maintaining a uniform load and preventing damage to the surfaces being joined ¹.

Purpose of the 4022821 Captive Washer Cap Screw

This Cummins part is designed to secure various components within a truck, contributing to the structural integrity of the assembly. It plays a role in fastening parts that are subject to vibration and dynamic loads, ensuring that connections remain secure under operating conditions. This screw is particularly useful in applications where access for maintenance is limited, as its design reduces the risk of washer loss.

Key Features

The 4022821 Captive Washer Cap Screw features a robust design with a built-in washer that is held captive by a protrusion under the screw head. It is typically made from high-strength materials to withstand the demanding conditions of heavy-duty truck environments. The screw’s thread design ensures a secure fit, while the captive washer provides consistent pressure distribution, enhancing the overall performance of the fastening system ².

Benefits

Using the 4022821 Captive Washer Cap Screw offers several advantages. Its design simplifies the installation process by eliminating the need to handle a separate washer, reducing the risk of loss and ensuring a more efficient assembly. The integrated washer enhances the screw’s ability to distribute pressure evenly, improving the reliability of the fastened connection. Additionally, the high-strength material composition contributes to the screw’s durability, making it suitable for long-term use in heavy-duty applications.

Installation Process

To install the 4022821 Captive Washer Cap Screw, begin by ensuring that the surfaces to be joined are clean and free of debris. Align the screw with the designated hole and use a torque wrench to tighten it to the manufacturer’s specified torque settings. This ensures that the screw is properly secured without over-tightening, which could damage the components or the screw itself. Regular inspection during installation can help identify any issues early on, ensuring a secure and lasting connection.

Common Applications

This part is commonly used in various systems within heavy-duty trucks, including engine components, transmission assemblies, and chassis structures. Its versatility makes it suitable for applications where secure fastening is critical, such as in the attachment of brackets, panels, and other structural elements. The screw’s design and material properties make it an ideal choice for these demanding applications.

Troubleshooting and Maintenance

To maintain the performance of the 4022821 Captive Washer Cap Screw, regular inspection is recommended. Look for signs of wear, corrosion, or loosening, which may indicate the need for re-tightening or replacement. Proper torque settings during installation and periodic checks can help prolong the service life of the screw. In case of damage or failure, replacement with an identical screw is advised to ensure continued reliability and performance.

Manufacturer Overview - Cummins

Cummins is a renowned manufacturer in the automotive industry, particularly known for its heavy-duty truck components. With a rich history of innovation and quality, Cummins offers a wide range of products designed to meet the demanding requirements of commercial vehicles. The company’s reputation for reliability and performance makes its components, including the 4022821 Captive Washer Cap Screw, a preferred choice for professionals in the field.

Captive Washer Cap Screw 4022821 in Cummins Engines

The Captive Washer Cap Screw 4022821 is a critical component in several Cummins engine models, ensuring secure fastening and stability. This part is integral to the assembly and maintenance of the engines, providing a reliable connection between various parts.

ISM CM570 and ISM CM570/870

In the ISM CM570 and ISM CM570/870 engines, the Captive Washer Cap Screw 4022821 is used to secure components that require precise alignment and stability. These engines are known for their robust performance and reliability, and the use of this screw ensures that the engine’s internal components remain tightly fastened, contributing to the overall durability and efficiency of the engine.

ISM CM876 and ISM11 CM876 SN

For the ISM CM876 and ISM11 CM876 SN engines, the Captive Washer Cap Screw 4022821 plays a similar role in maintaining the structural integrity of the engine. These engines are designed for heavy-duty applications, and the secure fastening provided by this screw is essential for withstanding the stresses and demands of such environments.

QSM11 CM570

In the QSM11 CM570 engine, the Captive Washer Cap Screw 4022821 is utilized to ensure that various engine components are held firmly in place. This engine is engineered for high performance and reliability, and the use of this screw helps maintain the precision and stability required for optimal engine operation.

Each of these engines benefits from the use of the Captive Washer Cap Screw 4022821, ensuring that the engine components remain securely fastened and aligned, contributing to the overall performance and longevity of the engine.

Role of Part 4022821 Captive Washer Cap Screw in Engine Systems

The 4022821 Captive Washer Cap Screw is instrumental in ensuring the secure assembly and operation of various engine components.

In the arrangement of engine components, this screw plays a significant role by providing a reliable fastening solution that keeps parts in their designated positions. This is particularly important in maintaining the structural integrity and alignment of components during engine operation.

For lifting operations, whether it involves moving the engine for maintenance or installation, the 4022821 screw ensures that attached components remain firmly in place, reducing the risk of detachment or misalignment.

When it comes to the cover of the engine, this screw is often used to secure covers that protect internal components from debris and environmental factors. Its design helps in creating a sealed environment, which is essential for the engine’s performance and longevity.

In the context of hand holes, which are access points for maintenance, the 4022821 screw is utilized to secure covers or panels. This ensures that these access points can be easily opened and closed without the risk of losing screws, which could potentially cause damage if ingested by the engine.

For mounting components, such as the air intake manifold, the 4022821 screw provides a strong and secure attachment point. This is vital for the manifold’s function in directing air into the engine cylinders, ensuring efficient combustion.

Similarly, in the intake manifold itself, this screw is used to fasten various sub-components, ensuring that the manifold remains intact and functions correctly under the stresses of engine operation.

Overall, the 4022821 Captive Washer Cap Screw is a versatile and reliable component that contributes to the secure and efficient operation of multiple engine systems.

Conclusion

The 4022821 Captive Washer Cap Screw by Cummins is a critical component in heavy-duty truck applications, providing secure fastening and stability in various engine systems. Its robust design, high-strength materials, and integrated washer make it an ideal choice for demanding environments. Regular maintenance and proper installation are essential to ensure the longevity and reliability of this part.