3940195
Hexagon Flange Head Cap Screw
Cummins®

The 3940195 Hexagon Flange Head Cap Screw, manufactured by Cummins, is a significant component in the maintenance and assembly of commercial trucks. This screw is designed to provide reliable fastening solutions in various truck applications. Understanding its role, features, and proper usage is vital for maintaining the integrity and performance of truck components.

Basic Concepts of Hexagon Flange Head Cap Screws

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flange beneath the head. The hexagonal head allows for efficient torque application using standard tools, while the flange provides a larger bearing surface, distributing the load more evenly and reducing the risk of the screw sinking into the material. In the automotive industry, these screws are commonly used for securing components that require a high degree of stability and resistance to vibration ¹.

Purpose and Role in Truck Operation

This Cummins part plays a specific role in the operation and maintenance of commercial trucks. It is used to fasten various components, ensuring they remain securely in place under operational stresses. This screw contributes to the assembly and maintenance of truck parts by providing a robust and durable fastening solution that can withstand the rigors of heavy-duty use.

Key Features

The 3940195 boasts several key features that enhance its performance and durability. Its hexagonal head design allows for easy and efficient torque application, while the flange beneath the head provides additional stability by distributing the load over a larger area. The screw is made from high-quality materials, ensuring it can withstand significant stress and corrosion, which are common in commercial truck environments ².

Benefits

Using the 3940195 offers several benefits. The design allows for improved torque application, ensuring that components are securely fastened. The flange characteristic provides resistance to loosening, which is crucial in environments where vibrations are common. Additionally, the enhanced load distribution contributes to the overall reliability and safety of truck operations by reducing the risk of component failure.

Installation Guidelines

Proper installation of the 3940195 is crucial for ensuring a secure and lasting fastening. The installation process involves using the appropriate tools, such as a torque wrench, to apply the recommended torque settings. It is important to follow best practices, such as ensuring the mating surfaces are clean and free of debris, to achieve the best results. Detailed guidelines should be consulted for specific torque values and installation steps.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening and damage. Identifying these issues early can prevent more significant problems. Troubleshooting may involve checking for proper torque application and inspecting the screw and mating surfaces for wear or corrosion. Regular maintenance, such as re-torquing screws and inspecting for signs of wear, can prolong the lifespan of the screws and ensure continued performance.

Cummins: A Brief Overview

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its commitment to quality and innovation. With a rich history of producing reliable and high-performance components, Cummins plays a significant role in ensuring the efficiency and durability of commercial trucks. Their dedication to excellence is evident in the design and manufacturing of parts like the 3940195.

Hexagon Flange Head Cap Screw 3940195 in Cummins Engines

The 3940195, manufactured by Cummins, is a critical component in various Cummins engine models. This screw is designed to secure different parts within the engine assembly, ensuring structural integrity and operational efficiency.

ISB Series Engines

In the ISB series, this screw is utilized in the following models:

• ISB CM550
• ISB CM850
• ISB/ISD6.7 CM2150 SN

The 3940195 screw plays a vital role in maintaining the alignment and fastening of various engine components, contributing to the overall performance and durability of these engines.

ISBE Series Engines

The ISBE series engines also benefit from this screw, specifically in:

• ISBE CM800
• ISBE4 CM850

Here, the screw is integral in securing parts that require precise fastening, ensuring that the engine operates smoothly and efficiently.

QSB Series Engines

In the QSB series, the 3940195 screw is used in:

• QSB4.5 CM850 (CM2850)
• QSB5.9 44 CM550
• QSB5.9 CM850

This screw is essential for maintaining the structural integrity of these engines, particularly in securing components that are subject to high stress and vibration.

Each of these engines relies on the 3940195 screw to ensure that all fastened parts remain secure, which is crucial for the engine’s performance and longevity.

Role of Part 3940195 Hexagon Flange Head Cap Screw in Engine Systems

In engine systems, the 3940195 is instrumental in ensuring the secure attachment and stability of various components. Specifically, it plays a significant role in the assembly and functionality of the rocker lever and rocker lever assembly.

Rocker Lever

The rocker lever is a pivotal component in the valve train of an engine. It acts as a mechanical lever that transfers motion from the camshaft to the valves, ensuring precise timing and efficient operation. The Hexagon Flange Head Cap Screw is used to fasten the rocker lever to its mounting point on the engine block or cylinder head. This secure attachment is essential for maintaining the alignment and operational integrity of the rocker lever. The flange head of the screw provides additional surface area for torque application, reducing the risk of stripping and ensuring a robust connection.

Rocker Lever Assembly

The rocker lever assembly encompasses the rocker lever along with other associated components such as the pushrods, fulcrum, and any additional linkage required for valve actuation. The Hexagon Flange Head Cap Screw is utilized in multiple points within this assembly to secure various parts together. Its design allows for easy installation and removal, facilitating maintenance and adjustments. The flange head also aids in distributing the clamping force more evenly, which is particularly beneficial in high-stress areas where the assembly undergoes significant mechanical loads during engine operation.

Conclusion

In summary, the 3940195 Hexagon Flange Head Cap Screw is a fundamental fastener in engine systems, providing the necessary stability and secure attachment for critical components like the rocker lever and rocker lever assembly. Its design enhances both the durability and reliability of these assemblies, contributing to the overall performance and longevity of the engine.