3940817
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3940817, is a component manufactured by Cummins, a leader in the automotive and heavy-duty truck industries. This screw is integral to the assembly and maintenance of heavy-duty trucks, ensuring the secure fastening of various components. Cummins’ reputation for quality and reliability underscores the importance of this part in demanding applications ¹.

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 tightening and loosening using a wrench, while the flange provides additional surface area to distribute the load and prevent the screw from pulling through the material. In mechanical systems, these screws are used to join components securely, ensuring structural integrity and proper function ².

Purpose and Role in Truck Operation

The 3940817 Hexagon Flange Head Cap Screw plays a specific role in heavy-duty trucks by fastening critical components that require robust and reliable connections. It is commonly used in applications where vibration resistance and load distribution are paramount, such as in engine mounts, chassis components, and various structural assemblies. The screw supports these systems by providing a secure and durable fastening solution ³.

Key Features

The 3940817 Hexagon Flange Head Cap Screw boasts several key features that enhance its performance and reliability. Its hexagonal head design allows for easy and precise tightening using standard tools. The flange beneath the head increases the surface area in contact with the fastened material, improving load distribution and reducing the risk of pull-through. Additionally, the screw is crafted from high-quality materials, ensuring durability and resistance to corrosion and wear.

Benefits

The advantages of using the 3940817 Hexagon Flange Head Cap Screw include enhanced durability, superior resistance to vibration, and ease of installation. The screw’s design and material properties contribute to its longevity, making it a reliable choice for heavy-duty applications. Its resistance to vibration ensures that fastened components remain secure under dynamic conditions, while the ease of installation simplifies maintenance and repair processes.

Installation and Usage

Proper installation of the 3940817 Hexagon Flange Head Cap Screw involves adhering to specific torque specifications to ensure a secure and lasting connection. It is recommended to use a torque wrench to achieve the manufacturer’s specified torque values, which vary depending on the application and material being fastened. Best practices include cleaning the fastening area to remove debris and ensuring that the screw is aligned correctly before tightening.

Maintenance and Troubleshooting

To maintain the 3940817 Hexagon Flange Head Cap Screw and ensure its longevity, regular inspections are recommended. Look for signs of corrosion, wear, or loosening, and address any issues promptly. Common troubleshooting methods include re-torquing the screw to the specified value or replacing it if damage is detected. Proper maintenance practices help prevent failures and ensure the continued reliability of the fastened components.

Safety Considerations

When working with the 3940817 Hexagon Flange Head Cap Screw, it is important to observe safety practices to protect oneself and others. This includes wearing appropriate personal protective equipment, such as gloves and safety glasses, to prevent injury from sharp edges or flying debris. Additionally, ensure that the work area is clean and free from hazards, and follow all manufacturer guidelines for handling and installation.

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 a strong reputation for innovation, quality, and reliability in the automotive and heavy-duty truck industries. The company’s extensive product range and commitment to customer satisfaction make it a trusted partner for professionals in these sectors.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw 3940817

The Cummins part 3940817, a Hexagon Flange Head Cap Screw, is designed to fit seamlessly with a variety of Cummins engines, ensuring robust and reliable fastening. This part is engineered to meet the stringent requirements of Cummins’ engine systems, providing durability and ease of use.

Engine Compatibility

6B5.9, ISB CM550, ISL CM554, QSB5.9 44 CM550

These engines, which include the 6B5.9, ISB CM550, ISL CM554, and QSB5.9 44 CM550, are part of Cummins’ lineup of high-performance diesel engines. The 3940817 screw is specifically designed to fit these engines, providing a secure fastening solution for various components. Its hexagonal flange head allows for easy tightening and removal, making maintenance and repairs more efficient.

ISC CM554, QSC8.3 CM554, QSL9 CM554

The ISC CM554, QSC8.3 CM554, and QSL9 CM554 engines are also compatible with the 3940817 screw. These engines are known for their reliability and efficiency, and the use of this screw ensures that all components are securely fastened, contributing to the overall performance and longevity of the engine.

L8.9, L8.9 L121, L9.5 L117

The L8.9, L8.9 L121, and L9.5 L117 engines are another set of Cummins engines that benefit from the use of the 3940817 screw. This part is engineered to fit these engines perfectly, providing a reliable fastening solution that meets the demands of these robust engines.

Each of these engines, whether part of the 6B5.9, ISB, ISC, ISL, QSB, QSC, QSL, L8.9, or L9.5 series, relies on the 3940817 screw for critical fastening applications. Its design ensures that it can withstand the operational stresses of these engines, providing a secure and durable fastening solution.

Role of Part 3940817 Hexagon Flange Head Cap Screw in Engine Systems

The part 3940817 Hexagon Flange Head Cap Screw is instrumental in securing and maintaining the integrity of various engine components. Its design allows for efficient torque transfer and reliable fastening, which is essential for the optimal performance and durability of engine systems.

Camshaft Assembly

In the camshaft assembly, the Hexagon Flange Head Cap Screw is used to secure the camshaft bearings and sprockets. This ensures that the camshaft remains aligned and operates smoothly, which is vital for the precise timing of valve operations. Proper fastening prevents any misalignment that could lead to increased wear or failure of the camshaft components.

Connecting Rod and Piston

For the connecting rod and piston assembly, this screw plays a role in securing the connecting rod cap to the rod body. This connection is under significant stress during engine operation, and the screw must withstand high loads to maintain the structural integrity of the assembly. Reliable fastening ensures that the piston moves smoothly within the cylinder, contributing to efficient combustion and power delivery.

Cylinder Head

In the cylinder head, the Hexagon Flange Head Cap Screw is often used to secure various components such as valve springs, rocker arms, and other ancillary parts. This ensures that these components remain in place and function correctly under the high temperatures and pressures within the combustion chamber. Proper securing of these parts is essential for maintaining compression and preventing leaks.

Fuel Injector and Plumbing

The screw is also utilized in the fuel injector and its plumbing. It secures the injector to the cylinder head and ensures that the fuel delivery system remains intact. This is important for consistent fuel delivery and combustion, directly impacting engine performance and efficiency. Additionally, it helps in maintaining the sealing integrity of the fuel lines, preventing any leaks that could affect engine operation.

General Application in Engine Parts

Across various engine parts, the Hexagon Flange Head Cap Screw is a common fastening solution due to its robust design and ease of use. It is employed in scenarios where high torque and secure fastening are required, ensuring that engine components remain firmly in place under operating conditions. This contributes to the overall reliability and performance of the engine system.

Conclusion

The 3940817 Hexagon Flange Head Cap Screw is a critical component in the assembly and maintenance of heavy-duty trucks and Cummins engines. Its design, featuring a hexagonal head and flange, ensures efficient tightening, load distribution, and resistance to pull-through. The screw’s durability, resistance to vibration, and ease of installation make it a reliable choice for demanding applications. Proper installation, maintenance, and adherence to safety practices are essential for maximizing the performance and longevity of this Cummins part.