3903331
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3903331, is a component manufactured by Cummins, a leader in the commercial vehicle industry. This screw is significant in the maintenance and operation of commercial trucks, providing a reliable fastening solution that ensures the integrity of various mechanical assemblies.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and a flange beneath the head. The hexagonal head allows for efficient torque application using standard tools, while the flange distributes the load over a larger area, reducing the risk of the screw pulling through the material ¹. In mechanical systems, these screws are used to secure components that require a high degree of stability and resistance to vibration.

Purpose and Role in Truck Operation

The 3903331 Hexagon Flange Head Cap Screw plays a specific role in the operation and maintenance of commercial trucks. It is commonly used in applications where components need to be securely fastened, such as in engine assemblies, transmission systems, and chassis structures. Its design ensures that critical parts remain firmly in place, even under the dynamic conditions experienced by commercial trucks.

Key Features

The 3903331 Hexagon Flange Head Cap Screw features a hexagonal head that facilitates easy and precise tightening with standard tools. The flange beneath the head provides additional surface area for load distribution, enhancing the screw’s effectiveness. Made from high-quality materials, this screw offers excellent durability and resistance to corrosion, making it suitable for the demanding environments encountered in commercial trucking.

Benefits

Using the 3903331 Hexagon Flange Head Cap Screw in truck maintenance offers several benefits. The screw’s design enhances fastening security, ensuring that components remain firmly attached. Its resistance to vibration reduces the likelihood of loosening over time, which is crucial in the dynamic environment of a commercial truck ². Additionally, the ease of installation and removal simplifies maintenance procedures, allowing for quicker and more efficient repairs.

Installation and Usage

Proper installation of the 3903331 Hexagon Flange Head Cap Screw is vital to ensure optimal performance and longevity. It is recommended to follow torque specifications provided by the manufacturer to achieve the correct tension without over-tightening, which could damage the screw or the surrounding material. Using the appropriate tools and techniques will help maintain the screw’s integrity and ensure reliable fastening.

Troubleshooting and Maintenance

Common issues with the 3903331 Hexagon Flange Head Cap Screw may include loosening or corrosion. Regular inspection and maintenance can help identify and address these problems early. If loosening is detected, re-tightening to the specified torque is recommended. In cases of corrosion, cleaning the affected area and applying a suitable anti-corrosion treatment can help prolong the screw’s lifespan and ensure continued reliable performance.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emission solutions. With a history of innovation and a commitment to quality, Cummins serves the commercial vehicle industry with products that enhance performance, efficiency, and reliability. The company’s extensive product range and dedication to customer satisfaction make it a trusted partner in the maintenance and operation of commercial trucks.

Cummins Engine Part 3903331: Hexagon Flange Head Cap Screw

The Cummins part 3903331, a Hexagon Flange Head Cap Screw, is a component used across various Cummins engine models. This part is designed to secure different engine parts together, ensuring the integrity and functionality of the engine assembly.

Application in Cummins Engines

4B3.9 and 6B5.9 Engines

The Hexagon Flange Head Cap Screw 3903331 is utilized in both the 4B3.9 and 6B5.9 engines. These engines, while differing in displacement and power output, share common design principles that necessitate the use of this particular screw. The screw’s flange head provides a broad surface area for torque application, which is crucial for maintaining the tight and secure connections required in these engines.

6C8.3 Engine

In the 6C8.3 engine, the Hexagon Flange Head Cap Screw 3903331 plays a pivotal role in securing various components. Given the 6C8.3 engine’s larger displacement and higher power output compared to the 4B3.9 and 6B5.9, the screw’s robust design is particularly beneficial. It ensures that the increased stress and load within the engine do not compromise the integrity of the connections.

Importance of the Hexagon Flange Head Cap Screw

The design of the Hexagon Flange Head Cap Screw 3903331 is optimized for high-stress environments typical of engine assemblies. The flange head allows for a larger contact area, distributing the load more evenly and reducing the risk of stripping or damage under high torque. This feature is particularly important in engines where precise and reliable fastening is critical to performance and longevity.

Compatibility and Usage

The Hexagon Flange Head Cap Screw 3903331 is engineered to fit seamlessly with the design specifications of the Cummins 4B3.9, 6B5.9, and 6C8.3 engines. Its compatibility ensures that it can be used across these models without modification, providing a standardized solution for securing engine components.

The screw’s application extends to various parts of the engine, including but not limited to, securing engine covers, brackets, and other structural components. Its use in these engines underscores its importance in maintaining the structural integrity and operational efficiency of the engine assembly.

Role of Part 3903331 Hexagon Flange Head Cap Screw in Engine Systems

The part 3903331 Hexagon Flange Head Cap Screw is instrumental in ensuring the secure assembly and reliable operation of various engine components. Its design and functionality contribute significantly to the integrity and performance of the engine system.

Turbocharger Arrangement

In turbocharger systems, the Hexagon Flange Head Cap Screw is often used to fasten the turbocharger to the engine block or exhaust manifold. This secure attachment is vital for maintaining the alignment and stability of the turbocharger, which is essential for efficient airflow and turbo response. The screw’s flange head provides additional surface area for a tighter seal, reducing the risk of leaks and ensuring that the turbocharger operates within optimal parameters.

Plumbing Connections

When it comes to engine plumbing, such as coolant or oil lines, the Hexagon Flange Head Cap Screw plays a key role in securing fittings and hoses. Its flange head design allows for a more robust connection, which is particularly important in high-pressure systems. This ensures that there are no loose connections that could lead to leaks, maintaining the integrity of the fluid pathways and ensuring consistent engine performance.

Fuel System Components

In fuel systems, the Hexagon Flange Head Cap Screw is used to secure fuel injectors, fuel rails, and other critical components. The secure fastening provided by this screw helps maintain the precise alignment needed for fuel delivery, which is essential for combustion efficiency and engine performance. Additionally, the flange head offers extra resistance against vibration, which is common in fuel systems, thereby enhancing the durability of the connections.

Turbocharger Location

The precise location of the turbocharger is another area where the Hexagon Flange Head Cap Screw is beneficial. Whether the turbocharger is mounted on the exhaust manifold or within the engine bay, this screw ensures that it remains firmly in place. This is particularly important in high-performance engines where the turbocharger is subjected to significant stress and heat. The secure attachment provided by the screw helps prevent movement or shifting, which could otherwise lead to decreased efficiency or even failure of the turbocharger.

Conclusion

The 3903331 Hexagon Flange Head Cap Screw is a versatile and reliable component that enhances the functionality and durability of various engine systems. Its application in turbocharger arrangements, plumbing connections, fuel systems, and turbocharger locations underscores its importance in maintaining the overall performance and reliability of the engine.