3686937
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3686937 and manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. This screw is significant due to its robust design and the reliability it offers in fastening various components within heavy-duty truck systems. Cummins, a renowned manufacturer in the automotive industry, ensures that this part meets stringent quality standards, making it a preferred choice for truck maintenance and assembly ¹.

Basic Concepts

Hexagon Flange Head Cap Screws are characterized by their hexagonal head, which allows for efficient torque application using standard tools, and a flange that provides additional surface area for distribution of clamping force. These screws are typically made from high-strength materials such as alloy steel, which enhances their durability and resistance to wear. In the automotive industry, they are commonly used to secure critical components that require both strength and stability, ensuring that assemblies remain intact under various operational stresses ².

Functionality and Operation

Within the context of a commercial truck, the Hexagon Flange Head Cap Screw operates by securely fastening components together. Its design allows it to withstand significant tensile and shear forces, which is vital for maintaining the structural integrity of truck assemblies. The screw’s hexagonal head facilitates easy installation and removal using a socket wrench, while the flange helps prevent the screw from pulling through the fastened materials ³.

Purpose and Role in Truck Operation

The 3686937 Hexagon Flange Head Cap Screw plays a specific role in the operation of a truck by securing various systems and assemblies. It is particularly important in applications where components are subject to vibration or dynamic loads, such as in the engine compartment or chassis. By providing a secure and stable connection, this screw contributes to the overall reliability and safety of the truck.

Key Features

The 3686937 Hexagon Flange Head Cap Screw features a hexagonal head that allows for precise torque application, a flange that enhances the distribution of clamping force, and a cap screw configuration that ensures a strong and secure fastening. These features collectively contribute to the screw’s performance and reliability, making it suitable for demanding applications in commercial trucks.

Benefits

This screw offers several benefits, including enhanced fastening strength due to its robust design, resistance to loosening under vibration, and ease of installation and removal. The flange feature also helps in distributing the clamping force more evenly, reducing the risk of damage to the fastened materials. Additionally, the high-strength material used in its construction ensures longevity and reliability in harsh operating conditions.

Installation and Usage Guidelines

For proper installation of the 3686937 Hexagon Flange Head Cap Screw, it is important to follow torque specifications provided by the manufacturer to ensure optimal clamping force without over-tightening. Recommended tightening procedures involve using a torque wrench to achieve the specified torque value, which helps in maintaining the integrity of the fastening. Best practices include inspecting the screw and the fastened components regularly to ensure continued performance and longevity.

Troubleshooting and Maintenance

Common issues with the 3686937 Hexagon Flange Head Cap Screw may include loosening, corrosion, or damage. Troubleshooting these issues involves checking for proper torque, ensuring that the screw and the fastened materials are free from corrosion, and inspecting for any signs of wear or damage. Maintenance tips include regular inspection and re-torquing as necessary, applying anti-seize compounds to prevent corrosion, and replacing screws that show signs of wear or damage to ensure continued reliability.

Cummins Overview

Cummins is a well-established manufacturer in the automotive industry, known for its commitment to quality and innovation in commercial truck components. With a rich history of producing reliable and high-performance parts, Cummins has built a reputation for excellence. The company’s dedication to advancing technology and maintaining rigorous quality standards ensures that its products, like the 3686937 Hexagon Flange Head Cap Screw, meet the demanding requirements of commercial truck applications.

Cummins Engine Compatibility with Part 3686937

The Hexagon Flange Head Cap Screw, part number 3686937, manufactured by Cummins, is designed to fit seamlessly within a variety of Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening and reliable performance.

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 Hexagon Flange Head Cap Screw for various critical applications. This part is essential in maintaining the structural integrity and operational efficiency of these engines.

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 Hexagon Flange Head Cap Screw. This part is used in specific areas of these engines to ensure proper assembly and secure fastening of components.

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, also rely on the Hexagon Flange Head Cap Screw for their assembly and maintenance. This part is crucial in maintaining the reliability and performance of these engines.

Role of Part 3686937 Hexagon Flange Head Cap Screw in Engine Systems

The part 3686937 Hexagon Flange Head Cap Screw is integral in securing various components within engine systems, ensuring stability and reliable performance.

Lubricating Oil Pump

In the lubricating oil pump, this screw is often used to fasten the pump housing to the engine block. This secure attachment is essential for maintaining the pump’s alignment and ensuring it operates efficiently to deliver oil to critical engine components. The screw’s hexagonal flange head provides a robust grip, reducing the likelihood of loosening under vibration.

Lubricating Pump Kit

When assembling a lubricating pump kit, the Hexagon Flange Head Cap Screw plays a role in attaching the pump’s various sub-components. This includes securing the pump cover, which houses the internal gears or rotors, to the pump body. Proper fastening is vital for maintaining the pump’s integrity and ensuring a leak-free operation.

Overhaul Kit

In an overhaul kit, this screw is commonly employed to reassemble the engine after maintenance. It is used to secure new or refurbished components, such as the pump housing or cover, back into place. The flange head design offers additional surface area for torque application, enhancing the screw’s effectiveness in withstanding operational stresses.

General Pump Applications

Across various pump applications within the engine system, the Hexagon Flange Head Cap Screw is utilized to fasten pump components securely. Whether it’s attaching the pump inlet or outlet fittings, or securing the pump drive mechanism, this screw ensures that all parts remain firmly in place, contributing to the pump’s overall efficiency and durability.

Lubricating Oil System

Within the broader lubricating oil system, this screw is instrumental in assembling and maintaining the system’s components. It is used to secure oil filters, pressure relief valves, and other ancillary components, ensuring they function correctly and contribute to the engine’s lubrication needs. The screw’s design allows for easy installation and removal, facilitating maintenance procedures.

Conclusion

The 3686937 Hexagon Flange Head Cap Screw is a critical component in the assembly and maintenance of Cummins engines, ensuring secure fastening and reliable performance across various engine systems. Its robust design, ease of installation, and resistance to loosening under vibration make it an essential part for maintaining the structural integrity and operational efficiency of commercial trucks.