3686745
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3686745 and manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. Cummins, a well-established name in the automotive industry, produces this screw to meet the rigorous demands of heavy-duty applications. This screw is integral to ensuring the structural integrity and reliable operation of various truck components.

Basic Concepts

Hexagon Flange Head Cap Screws are characterized by their hexagonal head, which provides a larger surface area for torque application, reducing the risk of cam-out during installation ¹. These screws are designed to distribute clamping force evenly, which is crucial for maintaining secure connections in automotive applications. They are commonly used in the assembly of engine components, chassis parts, and other critical truck systems where durability and reliability are paramount.

Purpose and Role in Truck Operation

The 3686745 Hexagon Flange Head Cap Screw plays a significant role in the operation of commercial trucks by securing various components that are subject to high stress and vibration. Its applications include fastening engine blocks, transmission housings, and other structural elements. The screw’s design ensures that these connections remain tight and secure, contributing to the overall stability and performance of the truck.

Key Features

The 3686745 Hexagon Flange Head Cap Screw features a hexagonal flange head, which allows for efficient torque application and reduces the likelihood of stripping during installation. It is typically made from high-strength materials such as alloy steel, which provides excellent durability and resistance to wear ². The screw’s threading specifications are designed to ensure a secure fit, with precise pitch and depth to accommodate various applications.

Benefits

One of the primary advantages of the 3686745 Hexagon Flange Head Cap Screw is its enhanced durability, which is critical in the demanding environment of commercial trucking. The material composition offers superior resistance to corrosion, ensuring long-term reliability even in harsh conditions ³. Additionally, the design of the screw facilitates ease of installation, allowing for quick and secure fastening without the need for specialized tools.

Installation Process

Proper installation of the 3686745 Hexagon Flange Head Cap Screw involves several steps to ensure a secure and lasting connection. Begin by cleaning the mating surfaces to remove any debris or contaminants. Use a torque wrench to apply the specified torque value, ensuring that the screw is tightened to the manufacturer’s recommendations. It is important to avoid over-tightening, which can lead to damage, and to check the connection periodically to ensure it remains secure.

Troubleshooting and Maintenance

Common issues with the 3686745 Hexagon Flange Head Cap Screw may include loosening due to vibration or corrosion. Regular inspection and maintenance are recommended to identify any signs of wear or damage. If corrosion is detected, the affected areas should be cleaned, and a corrosion-resistant coating may be applied. In cases where the screw has loosened, re-tightening to the specified torque value is necessary to maintain a secure connection.

Compatibility and Applications

The 3686745 Hexagon Flange Head Cap Screw is designed to be compatible with a wide range of truck models and components. Its versatility makes it suitable for various operating conditions, from standard road use to more demanding off-road environments. Ensuring compatibility with specific truck models and components is important to achieve optimal performance and longevity.

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 reputation for quality and innovation in the automotive industry. The company’s product offerings include a comprehensive range of components and systems designed to meet the needs of commercial trucking and other heavy-duty applications. Cummins’ commitment to excellence is reflected in the design and performance of the 3686745 Hexagon Flange Head Cap Screw.

Hexagon Flange Head Cap Screw 3686745 Compatibility with Cummins Engines

The Hexagon Flange Head Cap Screw part number 3686745, manufactured by Cummins, is a critical component that fits seamlessly with a range of Cummins engines. This screw is designed to provide robust fastening in various engine applications, ensuring secure connections and reliable performance.

ISX15 Series

• ISX15 CM2250
• ISX15 CM2250 SN
• ISX15 CM2350 X101

The ISX15 series engines benefit from the use of the 3686745 screw in several key areas. Its flange head design allows for easy alignment and installation, while the hexagon socket provides a secure grip for torque application. This screw is particularly useful in maintaining the integrity of engine components that require precise fastening.

QSX15 Series

• QSX15 CM2250
• QSX15 CM2250 ECF
• QSX15 CM2350 X105

In the QSX15 series, the 3686745 screw is employed in various engine assemblies. Its design ensures that it can withstand the operational stresses of these engines, providing a dependable fastening solution. The screw’s compatibility with the QSX15 series is crucial for maintaining the structural integrity of the engine components.

X15 Series

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

The X15 series engines also utilize the 3686745 screw in multiple applications. This screw’s ability to provide a strong and reliable fastening solution is essential for the proper functioning of these engines. Its use in the X15 series ensures that engine components remain securely fastened, contributing to the overall performance and longevity of the engine.

Hexagon Flange Head Cap Screw in Engine Systems

The part 3686745 Hexagon Flange Head Cap Screw is integral in securing and maintaining the structural integrity of various engine components.

Block Assembly

In the block assembly, this screw plays a significant role in fastening components that require a robust and secure connection. It is often used to attach brackets, mounts, and other accessories to the engine block. The flange head design ensures that the screw sits flush with the surface, providing a stable and even distribution of force. This is particularly important in the block assembly where vibrations and thermal expansions are common. The screw’s design helps in minimizing the risk of loosening over time, ensuring that all attached components remain firmly in place.

Cylinder Head Attachment

When it comes to the cylinder head, the Hexagon Flange Head Cap Screw is employed to secure the head to the engine block. This connection is vital for maintaining the seal between the head and the block, which is essential for proper engine function. The flange head of the screw provides additional surface area for contact, enhancing the seal and reducing the likelihood of leaks. Additionally, the hexagonal shape of the screw head allows for easy and secure tightening using standard tools, ensuring that the cylinder head is fastened to the precise torque specifications required for optimal engine performance.

Conclusion

The 3686745 Hexagon Flange Head Cap Screw is a critical component in the operation and maintenance of commercial trucks, particularly those equipped with Cummins engines. Its design, featuring a hexagonal flange head and high-strength material composition, ensures durability, ease of installation, and reliable performance in demanding environments. Proper installation, regular maintenance, and compatibility with specific engine models are essential for maximizing the benefits of this Cummins part.