3678514
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw, identified by part number 3678514, is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This screw is integral to the maintenance and operation of commercial trucks, providing secure fastening solutions that contribute to the overall reliability and performance of truck components.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt 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 distributes the load and prevents the screw from sinking into the material. In the context of truck components, this screw is used to secure various parts, ensuring they remain firmly in place under operational stress.

Purpose and Role in Truck Operation

The 3678514 Hexagon Flange Head Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is commonly used in applications where secure fastening is required, such as attaching brackets, panels, and other structural components. Its design ensures that these parts remain securely fastened, contributing to the structural integrity and performance of the truck. The screw’s ability to withstand high levels of stress and vibration makes it particularly suitable for use in heavy-duty applications.

Key Features

The 3678514 Hexagon Flange Head Cap Screw features a hexagonal flange head design, which provides a larger surface area for wrench application, facilitating easier and more secure tightening. It is typically made from high-strength materials, such as alloy steel, which enhances its durability and resistance to wear and corrosion. The screw’s threaded shaft ensures a strong grip, while the flange head helps distribute the load and prevent damage to the fastened material.

Benefits

Using the 3678514 Hexagon Flange Head Cap Screw offers several benefits. Its design provides improved fastening security, reducing the risk of loosening under vibration or stress. The hexagonal head allows for efficient installation and removal, while the flange head helps prevent the screw from sinking into the material. Additionally, the high-strength material composition ensures long-lasting performance and reliability.

Installation and Usage

Proper installation of the 3678514 Hexagon Flange Head Cap Screw is vital to ensure optimal performance and longevity. It should be installed using the appropriate torque specifications to achieve the correct tension without over-tightening, which could lead to damage. Best practices include using a torque wrench to apply the recommended torque and ensuring that the screw is aligned properly with the fastened components. Regular inspection and maintenance can help identify any issues early and ensure continued reliable performance.

Troubleshooting and Maintenance

Common issues with the 3678514 Hexagon Flange Head Cap Screw may include loosening due to vibration or corrosion over time. Regular inspection and maintenance can help identify these issues early. If loosening is detected, the screw should be re-tightened to the specified torque. In cases of corrosion, the affected area should be cleaned, and the screw may need to be replaced to ensure continued reliability. Proper storage and handling can also help prevent issues and prolong the screw’s lifespan.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes diesel and natural gas engines, as well as related technologies. With a history spanning over a century, Cummins has established itself as a trusted name in the commercial truck industry. The company is known for its commitment to quality, innovation, and customer satisfaction, providing reliable and high-performance components that meet the demanding requirements of commercial truck applications.

Hexagon Flange Head Cap Screw (Part 3678514) in Cummins Engines

The Hexagon Flange Head Cap Screw, identified by part number 3678514, is a critical component in various Cummins engines. This screw is integral to the assembly and maintenance of several engine models, ensuring secure fastening and alignment of components.

ISX Series Engines

• ISX CM570
• ISX CM870
• ISX CM871
• ISX15 CM2250
• ISX15 CM2250 SN
• ISX15 CM2350 X101

The ISX series engines, including the ISX CM570, ISX CM870, ISX CM871, ISX15 CM2250, ISX15 CM2250 SN, and ISX15 CM2350 X101, utilize the 3678514 screw in various applications. These engines are known for their robust performance and reliability, and the screw plays a vital role in maintaining the integrity of the engine’s structure.

QSX Series Engines

• QSX15 CM2250
• QSX15 CM2250 ECF
• QSX15 CM2350 X105

The QSX15 CM2250, QSX15 CM2250 ECF, and QSX15 CM2350 X105 engines also incorporate the 3678514 screw. These engines are designed for heavy-duty applications, and the screw’s precision and strength are essential for the proper functioning of the engine’s components.

QSB Series Engines

• QSB4.5 CM850 (CM2850)

The QSB4.5 CM850 (CM2850) engine uses the 3678514 screw in its assembly. This engine is known for its versatility and efficiency, and the screw’s role in securing various parts is crucial for its performance.

QSM Series Engines

• QSM11 CM570

The QSM11 CM570 engine also employs the 3678514 screw. This engine is designed for medium-duty applications, and the screw’s reliability ensures the engine’s components are securely fastened.

X15 Series Engines

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

The X15 series engines, including the X15 CM2350 X116B, X15 CM2350 X123B, and X15 CM2450 X134B, incorporate the 3678514 screw in their design. These engines are engineered for high-performance applications, and the screw’s precision fastening is essential for maintaining the engine’s structural integrity.

The 3678514 Hexagon Flange Head Cap Screw is a testament to Cummins’ commitment to quality and durability. Its use across various engine models underscores its importance in ensuring the engines’ reliability and performance.

Role of Part 3678514 Hexagon Flange Head Cap Screw in Engine Systems

The part 3678514 Hexagon Flange Head Cap Screw is integral to the assembly and securement of various engine components. Its design allows for a robust fastening solution that can withstand the high stresses and vibrations typical in engine environments.

Base Rail

In the context of the base rail, the Hexagon Flange Head Cap Screw ensures that the rail is firmly attached to the engine block or frame. This securement is vital for maintaining the structural integrity of the engine, as the base rail often supports other components and contributes to the overall stability of the engine assembly.

Captive Washer Cap Screw

When used in conjunction with captive washer cap screws, the Hexagon Flange Head Cap Screw enhances the sealing and load-distribution capabilities. The captive washer helps in evenly distributing the clamping force, reducing the risk of component deformation and ensuring a tight seal, which is essential for preventing leaks and maintaining efficiency.

Exhaust Outlet Connection

For the exhaust outlet connection, this screw plays a role in securing the connection between the engine and the exhaust system. A secure fit is necessary to prevent exhaust leaks, which can lead to performance issues and increased emissions. The flange head of the screw provides additional surface area for a tighter seal, enhancing the reliability of the exhaust system.

Flywheel Housing

In the flywheel housing, the Hexagon Flange Head Cap Screw is used to attach the housing to the engine block. This connection is subject to significant rotational forces, and the screw’s design helps in withstanding these forces while maintaining a secure fit. Proper securement of the flywheel housing is essential for the smooth operation of the engine’s rotational components.

Product Installation Package

Within a product installation package, the Hexagon Flange Head Cap Screw is often included to facilitate the assembly of various engine components. Its versatility allows it to be used in multiple applications throughout the engine, making it a valuable component in ensuring that all parts are correctly and securely fastened during installation.

Conclusion

The 3678514 Hexagon Flange Head Cap Screw is a critical component in the assembly and maintenance of Cummins engines. Its robust design and high-strength material composition ensure reliable performance and secure fastening of engine components. Proper installation and maintenance of this screw are essential for the continued reliability and efficiency of Cummins engines.