3906655
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3906655, is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This part is significant for its role in securing various components within commercial trucks, ensuring both the integrity and efficiency of the vehicle’s operation. Cummins, known for its robust and reliable engine and component manufacturing, provides this screw as part of its extensive range of high-quality automotive parts ¹.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by its hexagonal head and flange feature. The hexagonal head allows for efficient tightening and loosening using a wrench or socket, while the flange provides additional surface area to distribute the load and prevent the screw from pulling through the material. This design is particularly effective in fastening applications where high torque and secure attachment are required. The screw’s threading engages with the internal threads of a nut or directly into a pre-tapped hole, creating a strong and durable connection ².

Role in Truck Operation

In the context of a commercial truck, the 3906655 serves multiple purposes. It is utilized in fastening critical components such as engine mounts, transmission housings, and chassis parts. Its design ensures that these components remain securely attached under the demanding conditions of heavy-duty truck operation. The screw’s ability to withstand high torque and resist loosening is vital for maintaining the structural integrity and performance of the truck ³.

Key Features

The 3906655 boasts several key features that enhance its functionality and reliability. Its hexagonal head design allows for easy and precise tightening using standard tools. The flange feature provides additional bearing surface, which helps in distributing the load and preventing the screw from pulling through the material. The screw is typically made from high-strength steel, ensuring durability and resistance to wear. Additionally, the threading is designed to provide a strong and secure connection, capable of withstanding significant stress and vibration.

Benefits

The 3906655 offers several benefits that make it suitable for heavy-duty applications. Its design enhances fastening security, ensuring that components remain firmly attached even under extreme conditions. The flange feature contributes to resistance against loosening, which is crucial in dynamic environments where vibrations are common. Furthermore, the material composition and threading design contribute to the screw’s durability, making it a reliable choice for long-term use in commercial trucks.

Troubleshooting and Maintenance

To ensure the longevity and performance of the 3906655, regular maintenance and proper installation practices are recommended. Common issues such as loosening can often be addressed by re-tightening the screw to the manufacturer’s specified torque settings. Inspecting the screw and surrounding components for signs of wear or damage is also important. If corrosion is detected, cleaning the affected area and applying a suitable anti-corrosion treatment can help prevent further degradation. Additionally, using the correct tools and techniques during installation will help avoid damage to the screw or the fastened components.

About Cummins

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 producing reliable and high-performance components for the commercial truck industry. The company’s product range includes engines, powertrain components, and aftermarket parts, all designed to meet the rigorous demands of heavy-duty applications. Cummins’ commitment to innovation and quality has made it a trusted name among fleet operators and maintenance professionals.

Cummins Engine Part 3906655: Hexagon Flange Head Cap Screw

The Cummins part number 3906655, a Hexagon Flange Head Cap Screw, is a critical component in the assembly and maintenance of various Cummins engines. This part is designed to provide a secure fastening solution, ensuring that engine components remain tightly secured under operational stresses.

Application in Cummins Engines

The Hexagon Flange Head Cap Screw is utilized across multiple Cummins engine models, ensuring a standardized approach to fastening in these engines. Here are some of the engines where this part is integral:

• 6C8.3: This engine benefits from the precision and reliability of the 3906655 screw in securing various engine components. The screw’s design allows for efficient torque application, which is crucial for maintaining the integrity of engine assemblies.

• Other Cummins Engines: While the 6C8.3 is highlighted, the 3906655 screw is also applicable in other Cummins engines. Its design and material properties make it suitable for a wide range of engine types, ensuring consistent performance and durability.

Importance in Engine Assembly

The Hexagon Flange Head Cap Screw is essential for several reasons:

• Secure Fastening: The screw provides a robust fastening solution, preventing loosening under operational conditions.
• Ease of Installation: The hexagonal head allows for easy torque application with standard tools, streamlining the assembly process.
• Durability: Made from high-quality materials, this screw withstands the harsh conditions within engine compartments, ensuring longevity and reliability.

By incorporating the 3906655 screw, Cummins ensures that engine components are securely fastened, contributing to the overall performance and reliability of the engines.

Role of Part 3906655 Hexagon Flange Head Cap Screw in Engine Systems

The 3906655 is integral in securing various components within engine systems. Its design allows for efficient fastening and reliable performance under high stress and vibration conditions commonly found in engine operations.

Cylinder Block

In the cylinder block, the Hexagon Flange Head Cap Screw is used to fasten components such as cylinder head covers, oil pans, and valve covers. These screws ensure a tight seal, preventing oil leaks and maintaining the integrity of the lubrication system. They also secure critical sensors and wiring harnesses that are essential for engine monitoring and control.

Engine Block

Within the engine block, these screws play a role in attaching ancillary components like the intake manifold, exhaust manifold, and fuel injectors. Their flanged head design provides additional surface area for distribution of clamping force, reducing the risk of stripping or damage to the engine block material.

Short Block

For the short block, the Hexagon Flange Head Cap Screw is employed to secure the crankshaft, connecting rod bearings, and main bearings. This ensures that all rotating components are held firmly in place, contributing to the smooth operation and longevity of the engine.

Short Block 6C, 6Cart, and 6Cta

In configurations such as the short block 6C, 6Cart, and 6Cta, these screws are used to fasten cylinder head assemblies and secure the camshaft in place. They also help in mounting the timing chain or belt covers, ensuring precise timing and reliable engine performance.

Short Engine Kit

In a short engine kit, the Hexagon Flange Head Cap Screw is vital for assembling and securing various sub-components. This includes attaching the oil pump, securing the flywheel, and fastening the balance shaft, all of which are necessary for the balanced and efficient operation of the engine.

Conclusion

The 3906655 Hexagon Flange Head Cap Screw is a critical component in the assembly and maintenance of Cummins engines and commercial trucks. Its design, featuring a hexagonal head and flange, ensures secure fastening, ease of installation, and durability under demanding conditions. Regular maintenance and proper installation practices are essential to ensure the longevity and performance of this part. Cummins’ commitment to quality and innovation is evident in the reliable performance of the 3906655, making it a trusted component in the commercial truck industry.