3681390
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3681390, is a component manufactured by Cummins, a well-established name in the commercial truck industry. This screw is integral to the mechanical systems of commercial trucks, ensuring secure fastening and reliable performance in various applications.

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 torque application using standard tools, while the flange provides additional surface area to distribute load and prevent the screw from sinking into the material. In a truck’s mechanical system, this screw is used to secure components, ensuring they remain firmly in place under operational stress ¹.

Purpose and Role in Truck Operation

The 3681390 Hexagon Flange Head Cap Screw plays a significant role in the operation of a truck by securing critical components. It is commonly used in applications where high torque and secure fastening are required, such as in the engine, transmission, and chassis assemblies. Its design ensures that components remain fixed, contributing to the overall stability and performance of the truck ².

Key Features

The 3681390 Hexagon Flange Head Cap Screw features a hexagonal head that allows for easy and precise torque application. The flange beneath the head provides additional surface area, enhancing the screw’s ability to distribute load and resist sinking. Additionally, the screw is typically made from high-strength materials, ensuring durability and resistance to wear and tear ³.

Benefits

The 3681390 Hexagon Flange Head Cap Screw offers several benefits. Its hexagonal head design allows for efficient and consistent torque application, reducing the risk of over-tightening or under-tightening. The flange enhances the screw’s load-bearing capacity and prevents it from loosening over time. Furthermore, the high-strength material composition ensures enhanced durability, making it suitable for demanding applications in commercial trucks.

Installation and Usage

Proper installation of the 3681390 Hexagon Flange Head Cap Screw is crucial for ensuring its effectiveness. It should be installed using the appropriate torque settings to avoid over-tightening, which can lead to damage, or under-tightening, which can compromise security. Best practices include using a torque wrench to achieve the recommended torque specifications and ensuring that the screw is aligned correctly with the component it is securing.

Troubleshooting and Maintenance

Common issues with the 3681390 Hexagon Flange Head Cap Screw may include loosening over time or corrosion. Regular inspection and maintenance can help identify and address these issues promptly. If loosening is detected, the screw should be re-tightened to the recommended torque specifications. In cases of corrosion, the affected area should be cleaned, and the screw may need to be replaced to ensure continued reliability.

Cummins Overview

Cummins is a reputable manufacturer with a long-standing history in the commercial truck industry. Known for its commitment to quality and innovation, Cummins produces a wide range of components designed to enhance the performance and reliability of commercial vehicles. The company’s dedication to excellence is reflected in its products, including the 3681390 Hexagon Flange Head Cap Screw, which is engineered to meet the demanding requirements of truck applications.

Hexagon Flange Head Cap Screw (Part 3681390) Compatibility with Cummins Engines

The Hexagon Flange Head Cap Screw, part number 3681390, manufactured by Cummins, is a versatile component designed to fit various Cummins engines. This screw is integral in securing different parts and assemblies within the engine, ensuring structural integrity and operational efficiency.

B6.7S, ISB/ISD4.5 CM2150 B119, ISB/ISD6.7 CM2150 SN, ISBE CM2150, ISBE4 CM850

These engines, part of the Cummins lineup, utilize the 3681390 screw in various applications. The screw’s design allows it to securely fasten components, ensuring that parts remain tightly secured under operational stresses. This is particularly important in maintaining the alignment and stability of engine parts, contributing to the overall performance and longevity of the engine.

ISX CM570, L9.3 L105

The ISX CM570 and L9.3 L105 engines also benefit from the use of the 3681390 screw. In these engines, the screw is often used in critical areas where high torque and durability are required. Its flange head design provides a larger surface area for torque application, making it ideal for securing heavy-duty components.

QSB5.9 CM850, QSK60 CM500, QSK60 CM850 MCRS

The QSB5.9 CM850, QSK60 CM500, and QSK60 CM850 MCRS engines incorporate the 3681390 screw in their design. This screw is used in various applications, including securing engine covers, brackets, and other structural components. Its robust construction ensures that these parts remain firmly in place, even under high operational loads.

QSK95 CM2350 K111, QSK95 CM2350 K113

The QSK95 CM2350 K111 and QSK95 CM2350 K113 engines also feature the 3681390 screw. In these engines, the screw is used in applications that require high precision and strength. Its design allows for easy installation and removal, making it a practical choice for maintenance and repair tasks.

QSL9.3 CM2880 L113, QST30 CM2350 T101, QST30 CM552

The QSL9.3 CM2880 L113, QST30 CM2350 T101, and QST30 CM552 engines utilize the 3681390 screw in several key areas. This screw is particularly useful in applications where vibration resistance and durability are critical. Its flange head design provides a stable and secure fastening solution, ensuring that components remain tightly secured under varying operational conditions.

X15 CM2350 X123B

The X15 CM2350 X123B engine also incorporates the 3681390 screw in its design. This screw is used in various applications, including securing engine covers and brackets. Its robust construction and ease of use make it an ideal choice for maintaining the structural integrity of the engine.

Role of Part 3681390 Hexagon Flange Head Cap Screw in Engine Systems

The part 3681390 Hexagon Flange Head Cap Screw is integral in securing various components within engine systems, ensuring stability and proper function.

In the aftercooler system, this screw is used to fasten the aftercooler to its mounting brackets, ensuring it remains securely in place during operation.

For the air crossover connection, the screw plays a role in attaching the crossover pipe to the engine block or manifold, maintaining a sealed and stable connection.

In the air intake connection, it is employed to secure the intake pipe to the engine, ensuring a tight fit that prevents air leaks.

The belt tensioner relies on this screw to maintain the correct tension on the drive belt, which is essential for the operation of ancillary components like the alternator and water pump.

In the engine lubricating primer system, the screw is used to attach the primer to the engine, ensuring it can effectively prime the lubrication system before startup.

For the fuel control module, this screw helps in securing the module to the engine, ensuring it remains in the correct position for accurate fuel delivery.

The hand hole cover is fastened using this screw, providing easy access to the engine’s internal components for maintenance and inspection.

In injector plumbing, the screw is utilized to secure injector lines and fittings, ensuring there are no leaks in the fuel system.

For the intake connection mounting, it is used to attach the intake system to the engine, ensuring a secure and leak-free connection.

The lubricating oil filter housing is often secured with this screw, ensuring the filter is properly mounted and sealed.

In the oil pan, this screw is used to attach various brackets and components to the pan, ensuring they remain in place during engine operation.

For the raw water pump, the screw is employed to secure the pump to its mounting location, ensuring it operates efficiently without shifting.

In the service kit, this screw may be included to replace worn or damaged fasteners, ensuring all components are securely attached.

For turbocharger plumbing, the screw is used to secure turbocharger lines and fittings, maintaining a sealed and stable connection.

In the water inlet connection, it is utilized to attach the water inlet pipe to the engine, ensuring a secure and leak-free connection.

Finally, for the water pump, this screw is used to secure the pump to its mounting location, ensuring it operates efficiently and remains in place.

Conclusion

The 3681390 Hexagon Flange Head Cap Screw is a critical component in the maintenance and operation of Cummins engines. Its design and features make it suitable for a wide range of applications, ensuring the secure fastening of various engine components. Proper installation and maintenance of this screw are essential for the reliable performance of commercial trucks.