3680781
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by Part #3680781, is a specialized fastener produced by Cummins, a leading manufacturer in the automotive and heavy-duty truck industry. This screw is integral to various applications within heavy-duty trucks, ensuring secure fastening of critical components. Cummins’ reputation for quality and reliability underscores the significance of this part in maintaining the integrity and performance of truck systems.

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 provides additional surface area to distribute load and prevent the screw from sinking into the material. Within mechanical systems, these screws play a role in securing components that require both strength and stability ¹.

Purpose and Role in Truck Operation

This Cummins part serves a specific purpose in heavy-duty trucks by securing components that are subject to significant stress and vibration. It is commonly used in applications where a combination of high tensile strength and resistance to loosening is required. This screw secures engine components, chassis parts, and other critical assemblies, ensuring they remain firmly in place under operating conditions ².

Key Features

The 3680781 features a hexagonal head design that facilitates easy and precise tightening. The flange beneath the head enhances the screw’s load-bearing capacity and provides additional resistance against sinking into softer materials. Constructed from high-quality materials, this screw exhibits excellent durability and corrosion resistance, making it suitable for demanding environments ³.

Benefits

This part offers several advantages. Its robust design ensures durability under heavy loads and vibrations, which are common in heavy-duty truck applications. The flange contributes to enhanced stability and load distribution. Additionally, the screw’s ease of installation, combined with its reliable performance, makes it a preferred choice for securing critical components.

Installation Process

Proper installation of the 3680781 involves several steps to ensure optimal performance. Begin by selecting the appropriate size and grade of screw for the application. Use a wrench to tighten the screw to the specified torque, which can be found in the manufacturer’s guidelines. It is important to avoid over-tightening, as this can lead to damage. Regularly check the screw’s tightness during initial use to ensure it remains secure.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion. Regular inspection and maintenance are vital to ensure longevity and performance. If corrosion is detected, the affected area should be cleaned, and an appropriate anti-corrosion treatment applied. Loose screws should be re-tightened to the specified torque. In cases of significant wear or damage, replacement may be necessary to maintain system integrity.

Safety Considerations

When working with Hexagon Flange Head Cap Screws, it is important to observe several safety guidelines. Use the correct tools to avoid damaging the screw or the surrounding components. Ensure that all screws are tightened to the specified torque to prevent over-tightening, which can cause damage. Additionally, wear appropriate personal protective equipment (PPE) to safeguard against injuries during installation and maintenance procedures.

Cummins Overview

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 innovation, quality, and reliability in the automotive and heavy-duty truck industry. The company’s extensive product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of various applications.

Hexagon Flange Head Cap Screw (Part 3680781) in Cummins Engines

The Hexagon Flange Head Cap Screw, identified by part number 3680781, is a critical component in various Cummins engines. This screw is designed to provide a secure fastening solution, ensuring that engine components remain tightly secured during operation. The part’s design, featuring a hexagonal head and flange, allows for efficient torque application and distribution, which is essential for maintaining the integrity of engine assemblies.

Application in Cummins Engines

B5.6 CM2670 B152B, ISB5.9 CM2880 B110, ISB5.9 CM2880 B140, ISB5.9 CM2880 B149, QSB5.9 CM2880 B115

In these engines, the 3680781 screw is used in various applications, including securing engine covers, mounting brackets, and other critical components. Its robust design ensures that these parts remain firmly in place, even under the high stress and vibrations typical of engine operation.

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

These ISX and ISX15 series engines also utilize the 3680781 screw in several key areas. It is commonly found in the fastening of turbocharger components, exhaust systems, and other critical assemblies that require a reliable and durable connection.

QSX15 CM2250, QSX15 CM2250 ECF, QSX15 CM2350 X105

The QSX15 series engines incorporate the 3680781 screw in the fastening of various engine components, including those related to the fuel injection system and exhaust aftertreatment systems. Its use in these areas ensures that all parts are securely fastened, contributing to the overall performance and longevity of the engine.

X15 CM2350 X116B, X15 CM2350 X123B, X15 CM2450 X134B

In the X15 series engines, the 3680781 screw is used in the assembly of engine blocks, cylinder heads, and other structural components. Its ability to withstand high torque and stress makes it an ideal choice for these applications.

Z14 CM2670 Z103B

The Z14 series engine also benefits from the use of the 3680781 screw in various fastening applications. This includes securing components related to the engine’s cooling system and other critical assemblies that require a reliable fastening solution.

The consistent use of the 3680781 Hexagon Flange Head Cap Screw across these Cummins engines highlights its importance in maintaining the structural integrity and performance of the engine. Its design and material properties ensure that it can handle the demanding conditions of engine operation, providing a reliable fastening solution for critical engine components.

Role of Part 3680781 Hexagon Flange Head Cap Screw in Engine Systems

The part 3680781 Hexagon Flange Head Cap Screw is instrumental in securing and maintaining the integrity of various engine components. In the context of the cylinder block, this screw plays a significant role in fastening components that are essential for the structural stability and operational efficiency of the engine. By providing a robust connection, it ensures that the cylinder block remains securely in place, which is vital for the engine’s overall performance.

When it comes to the vibration damper, the Hexagon Flange Head Cap Screw is used to attach the damper to the crankshaft or the engine block. This attachment is essential for reducing the vibrations generated during the engine’s operation. The screw’s design allows for a tight and durable connection, which is necessary to effectively mitigate vibrations and ensure smooth engine operation.

In both applications, the screw’s flange head provides additional surface area for distribution of clamping force, enhancing the security of the connection and reducing the risk of loosening over time. This feature is particularly beneficial in high-stress environments typical of engine systems, where components are subject to constant vibration and thermal expansion.

Conclusion

The 3680781 Hexagon Flange Head Cap Screw is a critical component in the maintenance and operation of heavy-duty truck engines. Its robust design, ease of installation, and reliable performance make it an essential part for securing critical components under demanding conditions. Proper installation, regular maintenance, and adherence to safety guidelines are vital to ensure the longevity and performance of this Cummins part.