3680866
Hexagon Flange Head Cap Screw
Cummins®

The 3680866 Hex Flange Head Cap Screw is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This screw is designed for use in various fastening applications within commercial trucks, ensuring secure and reliable connections in critical components.

Basic Concepts

A Hex Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flanged base. The hexagonal head allows for easy 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. Mechanically, it functions by converting torque applied to the head into axial force, which secures the components together ¹.

Purpose and Role in Truck Operation

In the context of commercial trucks, the 3680866 Hex Flange Head Cap Screw plays a significant role in the assembly and maintenance of various truck components. It is used to fasten parts that require a high degree of stability and resistance to vibration, such as engine mounts, chassis components, and body panels. By providing a secure connection, it contributes to the overall structural integrity and performance of the truck ².

Key Features

The 3680866 Hex Flange Head Cap Screw features a hex-shaped head, which allows for efficient torque application using standard tools. The flange design enhances the screw’s ability to distribute load and resist pull-out, making it suitable for applications where high fastening strength is required. Additionally, its cap screw functionality ensures a clean, flush installation, reducing the risk of damage to connected surfaces.

Benefits

Using the 3680866 Hex Flange Head Cap Screw offers several benefits. Its design provides improved fastening strength, making it less likely to loosen over time, even under vibration and dynamic loads. The ease of installation and removal is enhanced by the hex head, allowing for quick and efficient fastening processes. Furthermore, the flange helps to distribute the load more evenly, reducing the risk of material deformation.

Installation and Usage

Proper installation of the 3680866 Hex Flange Head Cap Screw involves using the correct torque specifications to ensure a secure fastening without over-tightening, which could damage the screw or the connected components. Recommended tools include a torque wrench and a suitable socket or wrench for the hex head. Following best practices, such as cleaning the mating surfaces and ensuring proper alignment, will help achieve a lasting and secure connection.

Troubleshooting and Maintenance

Common issues with the 3680866 Hex Flange Head Cap Screw may include loosening due to vibration or corrosion over time. Regular inspection and maintenance, such as tightening screws to the specified torque and applying anti-corrosion coatings, can help prolong the screw’s lifespan and ensure optimal performance. If corrosion is detected, cleaning the affected area and reapplying protective coatings is recommended.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history of innovation and quality, Cummins has established a strong reputation in the commercial truck industry. The company is committed to delivering reliable and efficient components that meet the demanding requirements of commercial vehicle applications. Cummins’ focus on quality and innovation ensures that their products, including the 3680866 Hex Flange Head Cap Screw, are designed to provide durable and high-performance solutions for the trucking industry ³.

Hex Flange Head Cap Screw (Part 3680866) in Cummins Engines

The Hex Flange Head Cap Screw (part number 3680866) is a critical component in various Cummins engine models, ensuring secure fastening and structural integrity. This screw is designed to withstand high stress and torque, making it suitable for use in demanding engine environments.

ISX Series Engines

• ISX CM570
• ISX CM870
• ISX CM871
• ISX12 CM2350 X102
• ISX12 G CM2180 EJ
• ISX12/ISX11.9 CM2250
• ISX15 CM2250
• ISX15 CM2250 SN
• ISX15 CM2350 X101

In the ISX series engines, the Hex Flange Head Cap Screw is used in various applications, including securing engine covers, mounting brackets, and other critical components. Its robust design ensures that these parts remain tightly fastened under the high operational stresses these engines experience.

QSX Series Engines

• QSX11.9 CM2250 ECF
• QSX15 CM2250
• QSX15 CM2250 ECF
• QSX15 CM2350 X105

Similar to the ISX series, the QSX engines also utilize the Hex Flange Head Cap Screw for securing various engine components. The screw’s ability to maintain a tight hold under high torque and stress conditions is crucial for the longevity and reliability of these engines.

X15 Series Engines

• X15 CM2350 X116B
• X15 CM2350 X123B
• X15 CM2450 X134B

In the X15 series engines, the Hex Flange Head Cap Screw is employed in several key areas, including the fastening of engine covers and other structural components. Its design ensures that these parts remain securely fastened, contributing to the overall durability and performance of the engine.

Role of Part 3680866 Hex Flange Head Cap Screw in Engine Systems

In the intricate assembly of engine systems, the part 3680866 Hex Flange Head Cap Screw serves as a fundamental fastening component, ensuring the secure attachment and alignment of various engine components.

Cylinder Block

Within the cylinder block, the Hex Flange Head Cap Screw is utilized to fasten critical components such as the cylinder head, ensuring a tight seal and proper alignment. This secure attachment is essential for maintaining the integrity of the combustion chamber and preventing any potential leaks that could compromise engine performance.

Front Gear Housing

In the front gear housing, the Hex Flange Head Cap Screw plays a significant role in securing the timing gears and chains. This ensures precise timing and synchronization of the engine’s valve and piston movements, which is vital for efficient engine operation and longevity.

Rear Gear Housing

Similarly, in the rear gear housing, the Hex Flange Head Cap Screw is employed to fasten components such as the camshaft and crankshaft gears. This secure attachment is necessary for maintaining the correct rotational alignment and timing, which directly impacts the engine’s overall performance and reliability.

The Hex Flange Head Cap Screw’s robust design and secure fastening capabilities make it an indispensable component in the assembly and maintenance of engine systems, contributing to the seamless operation and durability of the engine.

Conclusion

The 3680866 Hex Flange Head Cap Screw is a vital component in the commercial truck industry, particularly in Cummins engines. Its design and features ensure secure fastening and structural integrity in various engine components, contributing to the overall performance and reliability of the engine. Proper installation, maintenance, and understanding of its role in engine systems are essential for maximizing the benefits of this Cummins part.