3685747
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Cummins 3685747 Hexagon Flange Head Cap Screw is a specialized fastener designed for heavy-duty truck applications. This screw ensures secure attachment of various components within the truck’s structure and engine system. Its robust design and high-quality materials make it suitable for demanding conditions encountered in heavy-duty trucking.

Basic Concepts

A Hexagon Flange Head Cap Screw is characterized by its hexagonal head and a flange beneath the head. The hexagonal head allows for efficient tightening and loosening using a wrench or socket, while the flange provides a larger bearing surface that helps distribute the load and prevent the screw from sinking into the material it is fastening. This design is particularly useful in applications where vibration and dynamic loads are common ¹.

Purpose and Role in Truck Operation

This Cummins part plays a significant role in the operation and maintenance of heavy-duty trucks. It is used in various applications, including securing engine components, attaching body panels, and fastening chassis parts. Its design ensures a secure and stable connection, which is vital for the safe and efficient operation of the truck. The screw’s ability to withstand high loads and resist loosening due to vibration makes it an ideal choice for these applications ².

Key Features

The 3685747 features a hexagonal head that allows for easy and precise tightening using standard tools. The flange beneath the head provides additional surface area, enhancing the screw’s load-bearing capacity and preventing it from embedding into the material. The screw is typically made from high-strength steel, which offers excellent durability and resistance to wear and corrosion. These features contribute to the screw’s functionality and longevity in heavy-duty applications ³.

Benefits

Using this part in truck applications offers several benefits. The screw’s design enhances fastening security, ensuring that components remain firmly attached even under dynamic loads and vibrations. Its ease of installation and removal simplifies maintenance procedures, reducing downtime. Additionally, the screw’s resistance to corrosion and wear prolongs its service life, providing long-term reliability in demanding environments.

Installation and Usage

Proper installation of the 3685747 is crucial for ensuring a secure and lasting fastening. It is recommended to use the appropriate torque specifications provided by the manufacturer to avoid over-tightening or under-tightening. Using the correct tools, such as a torque wrench, ensures that the screw is tightened to the optimal level. Following best practices, such as cleaning the mating surfaces and using thread lubricant where applicable, can further enhance the installation process.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion. Regular inspection and maintenance can help identify and address these issues promptly. If a screw shows signs of loosening, it should be re-tightened to the specified torque. Corrosion can be mitigated by using screws made from corrosion-resistant materials and applying protective coatings where necessary. Proper maintenance practices, such as keeping the fastening areas clean and free of debris, can prolong the lifespan of the screw and ensure optimal performance.

Safety Considerations

When working with Hexagon Flange Head Cap Screws, it is important to follow safety guidelines to prevent accidents and ensure personal safety. Using the correct tools and following manufacturer recommendations are essential practices. Additionally, wearing appropriate personal protective equipment, such as gloves and safety glasses, can protect 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 itself as a trusted name in the automotive and heavy-duty truck industry. The company is committed to quality and innovation, continually developing advanced technologies and solutions to meet the evolving needs of its customers. Cummins’ dedication to excellence is reflected in its wide range of high-performance components, including the 3685747 Hexagon Flange Head Cap Screw.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw (Part 3685747)

The Hexagon Flange Head Cap Screw, part number 3685747, manufactured by Cummins, is a versatile component designed to fit various engines within the Cummins engine lineup. This screw is engineered to provide a secure fastening solution in applications where a robust and reliable connection is essential.

Cummins Medium-Duty Engines

The part 3685747 is compatible with several medium-duty engines, including:

• B6.7 CM2670 B153B
• D4.0 CM2620 D103B
• Z14 CM2670 Z103B

These engines are often used in a variety of applications, from construction equipment to agricultural machinery, where durability and performance are paramount.

Cummins Heavy-Duty Engines

For heavy-duty applications, the Hexagon Flange Head Cap Screw is suitable for:

• ISBE4 CM850
• QSB6.7 CM850 (CM2850)
• QSB7 CM2880 B117

These engines are typically found in large trucks, buses, and industrial machinery, demanding high strength and reliability from their components.

Cummins High-Output Engines

In high-output scenarios, the part 3685747 is also used with:

• QSK19 CM2350 K105
• QSK60 G CM2358 K110
• QSK60G
• QST30 CM2350 T101

These engines are often utilized in power generation, marine, and other demanding environments where peak performance and longevity are critical.

The Hexagon Flange Head Cap Screw is engineered to meet the stringent requirements of Cummins engines, ensuring compatibility and performance across a wide range of applications. Its design allows for easy installation and removal, making it a practical choice for maintenance and repair tasks.

Hexagon Flange Head Cap Screw in Engine Systems

The part 3685747 is integral to the assembly and functionality of various engine components. Its role is to provide secure fastening, ensuring that components remain firmly in place under the demanding conditions of engine operation.

Aftercooler

In the aftercooler system, the Hexagon Flange Head Cap Screw is used to fasten the aftercooler to its mounting brackets. This secure attachment is essential for maintaining the structural integrity of the aftercooler, allowing it to effectively cool the compressed air from the turbocharger before it enters the engine cylinders.

Exhaust Temperature Control Arrangement

For the exhaust temperature control arrangement, these screws are employed to attach temperature sensors and control valves. Accurate and secure fastening ensures that the sensors provide reliable data and that the control valves operate correctly, maintaining optimal exhaust temperatures and protecting the engine from overheating.

Turbocharger Arrangement

Within the turbocharger arrangement, the Hexagon Flange Head Cap Screw is utilized to secure the turbocharger to the engine block and exhaust manifold. This fastening is vital for withstanding the high pressures and temperatures generated during operation, ensuring the turbocharger functions efficiently to boost engine performance.

Engine Block and Cylinder

On the engine block and cylinder components, these screws are used to attach various covers and brackets. This includes securing cylinder head covers and valve covers, which are critical for maintaining the engine’s sealed environment and protecting internal components from contaminants.

Engine Lifting Bracket

The engine lifting bracket relies on the Hexagon Flange Head Cap Screw for secure attachment to the engine block. This ensures that the bracket can safely support the engine’s weight during maintenance or replacement procedures, providing a stable and reliable lifting point.

Power Take-Off Assembly

In the power take-off (PTO) assembly, these screws are used to fasten the PTO housing and related components. Secure fastening is necessary to ensure the PTO can transmit power efficiently from the engine to auxiliary equipment, such as hydraulic pumps or generators.

Raw Water Pump

For the raw water pump, the Hexagon Flange Head Cap Screw is used to attach the pump housing and impeller. This secure attachment is essential for maintaining the pump’s structural integrity and ensuring it can effectively circulate cooling water through the engine, preventing overheating.

Valve and Exhaust Temperature Control

Finally, in valve and exhaust temperature control systems, these screws are used to fasten various components, including valve covers and temperature control modules. Secure fastening ensures these systems operate correctly, maintaining engine efficiency and protecting against potential damage from extreme temperatures.

Conclusion

The Cummins 3685747 Hexagon Flange Head Cap Screw is a critical component in heavy-duty truck and engine applications. Its robust design, ease of use, and compatibility with various Cummins engines make it an essential part for ensuring secure and reliable fastening in demanding environments. Proper installation, maintenance, and adherence to safety guidelines are vital for maximizing the performance and longevity of this part.