3903940
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Cummins 3903940 Hexagon Flange Head Cap Screw is a specialized fastener designed for use in commercial trucks. It is engineered to provide secure and reliable fastening in various truck components, ensuring the integrity and performance of critical systems. This screw is particularly valued in the trucking industry for its robust design and dependable performance under demanding conditions.

Basic Concepts

Hexagon Flange Head Cap Screws are characterized by their hexagonal head and flanged base, which offer enhanced grip and resistance to loosening. These screws are commonly used in mechanical assemblies where high torque and secure fastening are required. The flange provides additional surface area for distribution of clamping force, reducing the risk of the screw pulling through the material ¹.

Purpose and Role in Truck Operation

The 3903940 Hexagon Flange Head Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is utilized in various truck components, including engine mounts, transmission housings, and chassis assemblies. By providing a secure and stable connection, this screw helps maintain the structural integrity and performance of these components, contributing to the overall reliability of the truck ².

Key Features

The Cummins 3903940 Hexagon Flange Head Cap Screw features a hexagonal flange head design, which allows for easy tightening and loosening using standard tools. It is manufactured from high-quality materials to ensure durability and resistance to corrosion. The screw also has precise threading specifications to provide a strong and secure fastening solution ³.

Benefits

The 3903940 Hexagon Flange Head Cap Screw offers several advantages. Its design enhances fastening security, reducing the likelihood of loosening over time. The flange head provides additional grip, making it easier to install and remove the screw. Additionally, its compatibility with various truck components ensures versatile application across different systems ⁴.

Installation Guidelines

Proper installation of the 3903940 Hexagon Flange Head Cap Screw is crucial for optimal performance. Begin by ensuring the mating surfaces are clean and free of debris. Use a torque wrench to tighten the screw to the specified torque settings, which can be found in the truck’s maintenance manual. It is recommended to use a socket wrench for installation to avoid damaging the hexagonal head ⁵.

Maintenance Tips

To ensure the longevity and performance of the 3903940 Hexagon Flange Head Cap Screw, periodic inspection and maintenance are necessary. Regularly check for signs of loosening or corrosion. If any issues are detected, tighten the screw to the recommended torque specifications or replace it if necessary. Keeping the screw and surrounding areas clean will also help prevent corrosion and ensure reliable operation ¹.

Troubleshooting Common Issues

Common issues with the 3903940 Hexagon Flange Head Cap Screw include loosening, corrosion, and damage. If the screw becomes loose, re-tighten it to the specified torque. Corrosion can be addressed by cleaning the screw and applying a corrosion-resistant coating. If the screw is damaged, it should be replaced to maintain the integrity of the fastening ².

Safety Considerations

When working with the 3903940 Hexagon Flange Head Cap Screw, it is important to observe safety precautions. Use appropriate personal protective equipment, such as gloves and safety glasses, to protect against injury. Ensure proper handling and storage of the screws to prevent damage. Dispose of any damaged or unused screws according to local regulations ³.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a strong reputation in the commercial truck industry, Cummins offers a wide range of products designed to deliver reliable performance and efficiency. The company’s commitment to innovation and quality ensures that its components, including the 3903940 Hexagon Flange Head Cap Screw, meet the demanding requirements of commercial trucking applications ⁴.

Compatibility with Cummins Engines

The Cummins part number 3903940, a Hexagon Flange Head Cap Screw, is designed to fit seamlessly with a variety of Cummins engine models. This screw is integral in securing components within the engine assembly, ensuring both stability and reliability.

4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines benefit from the use of the 3903940 screw in several critical applications. These engines, known for their robust performance, require precise fastening solutions to maintain operational integrity. The screw’s design ensures a secure fit, which is crucial for the longevity and efficiency of these engines ⁵.

B3.9 G, B5.9 G, and G5.9 Engines

The B3.9 G, B5.9 G, and G5.9 engines also utilize the 3903940 screw in various configurations. These engines are part of a series that emphasizes durability and power. The screw’s flange head and hexagonal shape provide a strong grip, essential for the demanding conditions these engines operate under ¹.

B5.9 GAS PLUS CM556 and G5.9 CM558 Engines

For the B5.9 GAS PLUS CM556 and G5.9 CM558 engines, the 3903940 screw is a key component in the assembly process. These engines are equipped with advanced features that require precise fastening to function optimally. The screw’s design ensures that all parts are securely fastened, contributing to the overall performance and reliability of the engine ².

ISB5.9G CM2180 Engine

The ISB5.9G CM2180 engine, a high-performance model, also incorporates the 3903940 screw in its construction. This engine is designed for heavy-duty applications, and the screw’s robust design is essential for maintaining the structural integrity of the engine under extreme conditions ³.

Role in Engine Systems

The 3903940 Hexagon Flange Head Cap Screw is integral in securing various components within engine systems, ensuring stability and efficient operation.

Lever Systems

In lever systems, the Hexagon Flange Head Cap Screw is used to fasten the lever to its pivot point. This secure attachment is essential for the lever’s function, which often involves transmitting force or motion within the engine. The screw’s design allows for a firm grip, minimizing the risk of loosening under vibrational stress, which is common in engine environments ⁴.

Rocker Systems

Within rocker systems, the Hexagon Flange Head Cap Screw plays a significant role in attaching the rocker arm to its support structure. The rocker arm is a pivotal component that converts the linear motion of the engine’s pushrods into the rotational motion needed to open and close the valves. The screw ensures that the rocker arm remains firmly in place, allowing for precise and consistent valve operation. This is particularly important in high-performance engines where timing and valve operation directly impact engine efficiency and power output ⁵.

Conclusion

The Cummins 3903940 Hexagon Flange Head Cap Screw is a versatile and essential component for a range of Cummins engines, ensuring that each engine operates at peak efficiency and reliability. Its robust design, secure fastening capability, and compatibility with various engine components make it a critical part in maintaining the structural integrity and performance of commercial trucks.