3900679
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, Part #3900679 by Cummins, is a specialized fastener designed for use in commercial truck maintenance. Cummins, a renowned manufacturer in the automotive industry, produces this screw to meet the demanding requirements of heavy-duty applications. This screw is integral to ensuring the reliability and efficiency of commercial trucks, playing a significant role in various fastening applications across different truck components.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flange feature. The hexagonal head allows for secure 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 enhances the screw’s functionality in fastening applications, making it suitable for high-stress environments such as those found in commercial trucks.

Role in Truck Operation

This Cummins part plays a specific role in the operation and maintenance of commercial trucks. It is used in various truck components where secure and durable fastening is required. Applications include attaching brackets, securing panels, and fastening engine components. The screw’s design ensures that it can withstand the vibrations and stresses associated with truck operation, contributing to the overall reliability and safety of the vehicle.

Key Features

This part boasts several key features that enhance its performance and durability. Its hexagonal head design allows for easy and precise tightening and loosening, reducing the risk of damage to the screw or surrounding components. The flange feature provides additional stability and load distribution, preventing the screw from pulling through the material. Additionally, the screw is made from high-quality materials that offer excellent resistance to corrosion and wear, ensuring long-lasting performance in demanding environments.

Benefits

This Cummins part offers several benefits that make it an ideal choice for commercial truck applications. Its design provides improved fastening security, reducing the risk of loosening over time. The ease of installation and removal simplifies maintenance procedures, saving time and effort. Furthermore, the screw’s resistance to corrosion and wear ensures that it maintains its performance even in harsh operating conditions, contributing to the longevity and reliability of the truck.

Troubleshooting and Maintenance

To ensure the longevity and optimal performance of this part, regular maintenance and troubleshooting are necessary. Common issues may include corrosion, wear, or loosening. Inspecting the screw regularly for signs of damage or wear can help identify potential problems early. If corrosion is detected, cleaning the screw and applying a corrosion-resistant coating can help prevent further damage. Ensuring that the screw is properly tightened during installation can also reduce the risk of loosening over time.

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 is committed to quality and innovation in the automotive industry. The company offers a wide range of products designed to meet the needs of various industries, including commercial trucking. Cummins’ dedication to excellence ensures that their products, such as the 3900679 Hexagon Flange Head Cap Screw, deliver reliable performance and durability in demanding applications.

Compatibility with Cummins Engines

The Cummins Hexagon Flange Head Cap Screw part number 3900679 is designed to fit a variety of Cummins engines, ensuring secure fastening in various applications. Here is a detailed breakdown of its compatibility with the listed engines:

15N CM2380 M104B

This engine benefits from the 3900679 screw in securing components that require a reliable and robust fastening solution.

4B3.9, 6B5.9, 6C8.3, B4.5, B4.5 CM2350 B129B, B4.5 RGT, B5.6 CM2670 B152B, B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556

These engines, which include a range of smaller and medium-sized models, utilize the 3900679 screw for fastening various parts, ensuring durability and ease of assembly.

B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, B6.7S

The 3900679 screw is compatible with these larger B6.7 series engines, providing the necessary strength and stability for critical engine components.

C GAS PLUS CM556, C8.3 G

These engines, which are part of the Cummins GAS PLUS series, also benefit from the 3900679 screw, ensuring secure fastening in demanding conditions.

D4.0 CM2620 D103B, F2.8 CM2620 F135B, F3.8 CM2350 F120B, F3.8 CM2350 F128C, F3.8 CM2620 F137B, F3.8 F102, F4.5 CM2620 F139B

The 3900679 screw is also suitable for these engines, providing a reliable fastening solution for various components within these models.

The 3900679 screw is engineered to meet the stringent requirements of Cummins engines, ensuring compatibility and performance across a wide range of engine types.

Role of Part 3900679 Hexagon Flange Head Cap Screw in Engine Systems

The Hexagon Flange Head Cap Screw (part 3900679) is integral in securing various components within engine systems, ensuring stability and proper function. Its application spans across multiple assemblies and systems, providing essential fastening solutions.

Aftercooler Assembly and Plumbing

In the aftercooler assembly and aftercooler water plumbing, the Hexagon Flange Head Cap Screw is used to secure the aftercooler to the engine block or other mounting points. This ensures efficient cooling of the compressed air, which is vital for optimal engine performance. Additionally, it plays a role in the assembly aftercooler, where it helps maintain the structural integrity of the assembly, preventing leaks and ensuring efficient operation.

Belt Tensioner and Idler Pulley

For the belt tensioner and idler pulley, the screw is employed to secure these components in place. Proper tensioning of belts is essential for the efficient transfer of power to various engine components, such as the fan drive and fuel pump. The screw ensures that the tensioner and pulley remain fixed, allowing for consistent belt tension and reliable operation.

Cylinder Block Cover and Engine Control Module Plumbing

The cylinder block cover relies on the Hexagon Flange Head Cap Screw to maintain a secure seal, protecting internal components from contaminants. In the engine control module plumbing, the screw is used to fasten plumbing components, ensuring there are no leaks in the system that could affect engine performance.

Engine Cooling System and Heat Exchanger

Within the engine cooling system, the screw is vital for securing the heat exchanger and other cooling components. This ensures efficient heat dissipation, maintaining optimal engine temperatures. The screw also plays a role in the keel cooler plumbing, securing connections and ensuring the system operates without leaks.

Fuel System Components

In the fuel system, the Hexagon Flange Head Cap Screw is used in the fuel filter, fuel pump, and fuel pump coupling. It ensures these components are securely mounted, preventing vibrations that could lead to fuel delivery issues.

Refrigerant Compressor and Starting Motor Mounting

For the refrigerant compressor mounting and starting motor mounting, the screw provides the necessary fastening strength. This is essential for the reliable operation of the compressor and the starting motor, ensuring they function correctly under various operating conditions.

Thermostat Housing and Water Pump

The thermostat housing and thermostat top level assembly housing utilize the screw to maintain a secure fit, preventing coolant leaks. Similarly, in the water pump, the screw ensures the pump is firmly attached, allowing for efficient coolant circulation throughout the engine.

Additional Applications

The screw is also found in the oil level gauge location, performance parts, priming pump, heat shield, and exhaust recirculation systems. In each of these applications, it provides the necessary fastening strength to ensure components remain securely in place, contributing to the overall reliability and performance of the engine system.

Conclusion

The Hexagon Flange Head Cap Screw (part 3900679) by Cummins is a critical component in the maintenance and operation of commercial trucks and various Cummins engines. Its design, featuring a hexagonal head and flange, ensures secure and durable fastening across a wide range of applications. The screw’s resistance to corrosion and wear, along with its ease of installation and removal, makes it an ideal choice for demanding environments. Regular maintenance and proper tightening during installation are essential to ensure the longevity and optimal performance of this part. Cummins’ commitment to quality and innovation ensures that the 3900679 screw delivers reliable performance and durability in heavy-duty applications.