3920780
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw (Part #3920780) by Cummins is a specialized fastener designed for use in commercial trucks, particularly in heavy-duty applications. This screw ensures the secure attachment of various components within the truck’s structure, contributing to both the vehicle’s durability and operational efficiency.

Basic Concepts

The Hexagon Flange Head Cap Screw is characterized by its hexagonal head, which allows for efficient torque application using standard tools, and a flange that provides additional surface area for distribution of clamping force. Typically, these screws are manufactured from high-strength materials such as alloy steel, which offer superior tensile strength and resistance to wear ¹. Within mechanical assemblies, the screw functions by securely fastening components together, ensuring that they remain in place under various operational stresses.

Purpose and Function

In the context of truck operations, the 3920780 Hexagon Flange Head Cap Screw serves to fasten critical components, contributing to the structural integrity and performance of the vehicle. It is often used in applications where high clamping force is required, such as in the attachment of engine components, chassis parts, and other heavy-duty assemblies. By providing a secure and stable connection, this screw helps maintain the alignment and functionality of these components, which is vital for the overall performance and safety of the truck ².

Key Features

The 3920780 Hexagon Flange Head Cap Screw features a hexagonal head that allows for easy and precise application of torque using common tools like wrenches or sockets. The flange at the base of the head provides an increased bearing surface, which helps distribute the clamping force more evenly across the fastened components. Additionally, the cap screw design ensures a smooth, uninterrupted thread that engages fully with the mating part, enhancing the security of the fastening.

Benefits

Using the 3920780 Hexagon Flange Head Cap Screw offers several advantages. Its design enhances fastening security, making it less likely for the screw to loosen over time, even under vibration or dynamic loads commonly experienced in truck operations. The flange also provides additional resistance to loosening, further ensuring the stability of the fastened components. Moreover, the hexagonal head allows for straightforward installation and removal, facilitating maintenance and repair processes ³.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws may include corrosion, galling, or stripping of the threads. To troubleshoot these problems, it is important to regularly inspect the screws for signs of wear or damage. Maintenance practices such as applying an appropriate anti-seize compound during installation can help prevent corrosion and galling. Additionally, using the correct torque specifications ensures that the screws are tightened to the proper level, reducing the risk of stripping or over-tightening.

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 itself as a trusted name in the diesel engine and related technologies market. The company is committed to quality and innovation, consistently delivering reliable and high-performance products to meet the demanding needs of the automotive industry.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw Part 3920780

The Cummins part 3920780, a Hexagon Flange Head Cap Screw, is designed to be compatible with a variety of Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening in various applications.

Cummins 4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines are part of Cummins’ lineup of smaller, high-performance engines. The Hexagon Flange Head Cap Screw 3920780 is used in these engines to secure components that require a robust and reliable fastening solution. This part’s design ensures that it can withstand the operational stresses of these engines.

Cummins B4.5, B5.9, and B5.9 G Engines

The B4.5, B5.9, and B5.9 G engines are mid-range engines known for their versatility and efficiency. The Hexagon Flange Head Cap Screw 3920780 is utilized in these engines to fasten various parts, ensuring that the components remain securely in place under operational conditions.

Cummins B5.9 GAS PLUS CM556 and B5.9 GAS PLUS CM556 Engines

These engines, specifically designed for gas applications, benefit from the Hexagon Flange Head Cap Screw 3920780. This part is used to secure components that are critical to the engine’s performance and longevity, ensuring that the fastening remains secure even under the unique stresses of gas operation.

Cummins G5.9 and G5.9 CM558 Engines

The G5.9 and G5.9 CM558 engines are part of Cummins’ larger engine family. The Hexagon Flange Head Cap Screw 3920780 is used in these engines to fasten various components, providing the necessary strength and reliability to maintain the integrity of the engine’s structure.

Cummins ISB3.9 CM2220 B107 and ISB5.9 CM2880 B127 Engines

These engines are known for their durability and efficiency. The Hexagon Flange Head Cap Screw 3920780 is used in these engines to secure components that require a high level of fastening strength, ensuring that the engine operates smoothly and reliably.

Cummins ISB5.9G CM2180 and ISBE CM800 Engines

The ISB5.9G CM2180 and ISBE CM800 engines are part of Cummins’ lineup of high-performance engines. The Hexagon Flange Head Cap Screw 3920780 is used in these engines to fasten components that are critical to the engine’s performance, providing the necessary strength and reliability to maintain the engine’s integrity.

Cummins QSB3.9 30 CM550, QSB3.9 CM2880 B138, QSB5.9 30 CM550, QSB5.9 CM2880 B139, and QSB5.9G Engines

The QSB series engines are known for their versatility and efficiency. The Hexagon Flange Head Cap Screw 3920780 is used in these engines to secure components that require a high level of fastening strength, ensuring that the engine operates smoothly and reliably. This part’s design ensures that it can withstand the operational stresses of these engines, providing the necessary strength and reliability to maintain the engine’s integrity.

Role of Part 3920780 Hexagon Flange Head Cap Screw in Engine Systems

In the intricate assembly of engine systems, the part 3920780 Hexagon Flange Head Cap Screw serves as a vital fastening component, ensuring the secure attachment of various critical elements.

Clutch Assembly

Within the clutch assembly, this screw plays a significant role in maintaining the structural integrity by securing the clutch cover to the flywheel. This ensures that the clutch operates smoothly, transmitting power from the engine to the transmission efficiently.

Rear Cylinder Head

In the rear cylinder head, the Hexagon Flange Head Cap Screw is employed to fasten the head to the engine block. This secure attachment is essential for maintaining the seal around the combustion chamber, ensuring optimal compression and efficient combustion.

Fuel Supply Tube

The screw is also utilized in the fuel supply tube system, where it secures the tube to the engine block or fuel rail. This attachment is vital for maintaining the integrity of the fuel delivery system, ensuring a consistent and reliable fuel supply to the engine.

Engine Control Module (ECM)

In the Engine Control Module (ECM) mounting, the Hexagon Flange Head Cap Screw ensures that the ECM is securely fastened to its designated location. This is important for the stability and protection of the ECM, which is responsible for controlling various engine functions.

Long Block Assembly

During the assembly of the long block, which includes the cylinder block, crankshaft, pistons, and other essential components, this screw is used to secure various parts together. Its role is to maintain the alignment and structural integrity of the long block, ensuring smooth engine operation.

Performance Parts

In performance parts, such as upgraded cylinder heads or performance fuel systems, the Hexagon Flange Head Cap Screw is often used to secure these components. Its robust design ensures that these high-performance parts remain securely in place, even under increased stress and higher operating conditions.

Plumbing and Fuel Systems

In the engine’s plumbing and fuel systems, this screw is used to secure fuel lines, coolant hoses, and other fluid pathways. This ensures that these systems remain leak-free and operate efficiently, contributing to the overall performance and reliability of the engine.

Conclusion

By understanding the role of the part 3920780 Hexagon Flange Head Cap Screw in these various engine components, engineers and mechanics can appreciate its importance in maintaining the structural integrity and operational efficiency of the engine system.