4389734
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 4389734 and manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. This screw is integral to the assembly and maintenance of various truck components, ensuring both the structural integrity and operational efficiency of the vehicle. Cummins, a well-respected name in the automotive industry, produces this part with a focus on durability and performance, making it a reliable choice for heavy-duty applications ¹.

Basic Concepts

Hexagon Flange Head Cap Screws are characterized by their hexagonal head, which provides a larger surface area for torque application, and a flange that prevents the screw from being driven too far into the material. These screws are commonly used in the automotive industry for their ability to secure components firmly while distributing load stresses more evenly compared to standard cap screws. Their design allows for efficient tightening and reduced risk of cam-out, making them suitable for a variety of applications where secure fastening is required ².

Purpose and Role in Truck Operation

The 4389734 Hexagon Flange Head Cap Screw plays a specific role in commercial truck operations by securing critical components and ensuring structural integrity. It is often used in applications where vibrations and dynamic loads are common, such as in the fastening of engine components, chassis parts, and other structural elements. By providing a robust connection, this screw helps maintain the alignment and stability of various truck systems, contributing to overall vehicle performance and safety ³.

Key Features

The 4389734 Hexagon Flange Head Cap Screw features a hexagonal flange head that enhances torque application and reduces the likelihood of the screw head stripping during installation. It is typically made from high-strength materials such as alloy steel, which offers excellent resistance to wear and corrosion. The screw’s thread specifications are designed to provide a strong, secure hold, while the flange helps distribute load stresses and prevents the screw from sinking into the material. These features collectively contribute to the screw’s performance and reliability in demanding applications.

Benefits

One of the primary advantages of the 4389734 Hexagon Flange Head Cap Screw is its enhanced fastening strength. The hexagonal flange head allows for greater torque application without risking damage to the screw or the surrounding material. Additionally, the design resists loosening over time, even under dynamic conditions, ensuring a lasting connection. Its compatibility with various applications in commercial trucks makes it a versatile choice for maintenance and repair tasks.

Installation Guidelines

Proper installation of the 4389734 Hexagon Flange Head Cap Screw involves several steps to ensure secure and efficient fastening. Begin by selecting the appropriate drill bit to create a pilot hole, which should be slightly smaller than the screw’s diameter. Use a torque wrench to tighten the screw to the manufacturer’s specified torque settings, ensuring that it is neither over-tightened nor under-tightened. Recommended tools include a socket wrench with a hexagonal socket that matches the screw’s head size. Following these guidelines will help achieve a secure connection and prolong the screw’s lifespan.

Troubleshooting and Maintenance

Common issues with the 4389734 Hexagon Flange Head Cap Screw include corrosion, stripping, and loosening. Regular inspection for signs of wear or damage is recommended to identify potential problems early. If corrosion is detected, cleaning the affected area and applying a corrosion-resistant coating can help prevent further degradation. In cases of stripping, replacing the screw is often the best solution. To address loosening, re-tightening the screw to the proper torque specification or using a thread locker can be effective. Routine maintenance will help ensure the screw remains functional and reliable.

Cummins Overview

Cummins Inc. is a globally recognized leader in the design, manufacture, and distribution of engines, filtration, and power generation products. Founded in 1919, the company has a long-standing reputation for innovation and quality in the automotive industry. Cummins offers a wide range of products designed to meet the demanding requirements of commercial and industrial applications, including a variety of fasteners like the 4389734 Hexagon Flange Head Cap Screw. Their commitment to excellence and customer satisfaction underscores the reliability and performance of their products.

Hexagon Flange Head Cap Screw 4389734 in Cummins Engines

The Hexagon Flange Head Cap Screw 4389734, manufactured by Cummins, is a critical component in several of their engine models. This part is integral to the assembly and operation of the engines, ensuring structural integrity and proper functioning.

QSK19 CM2350 K105 and QSK19 CM2350 K114

The QSK19 CM2350 K105 and QSK19 CM2350 K114 engines utilize the 4389734 screw in various applications. These engines are part of Cummins’ QSK series, known for their reliability and performance in demanding environments. The screw is used in the assembly of critical components, ensuring that parts are securely fastened and aligned. Its design allows for easy installation and removal, which is crucial during maintenance and repair operations.

QSK50 CM2350 K108

In the QSK50 CM2350 K108 engine, the 4389734 screw plays a vital role in securing certain engine components. This engine is part of Cummins’ QSK series, designed for heavy-duty applications. The screw’s flange head provides a larger surface area for better torque application, which is essential for maintaining the structural integrity of the engine under high stress conditions.

QST30 CM2350 T101

The QST30 CM2350 T101 engine also incorporates the 4389734 screw in its construction. This engine is another variant in Cummins’ QST series, known for its robust design and efficiency. The screw is used in areas where a strong and reliable fastening solution is required, ensuring that the engine components remain securely attached during operation.

Grouping of Engines

The engines QSK19 CM2350 K105 and QSK19 CM2350 K114 can be grouped together due to their similar design and application. Both engines benefit from the 4389734 screw in maintaining the structural integrity of their components. Similarly, the QSK50 CM2350 K108 and QST30 CM2350 T101 engines, while part of different series, also utilize this screw for securing critical parts, highlighting its versatility and importance across different engine models.

Role of Part 4389734 Hexagon Flange Head Cap Screw in Engine Systems

The part 4389734 Hexagon Flange Head Cap Screw is integral to the assembly and maintenance of various engine components, particularly in the aftertreatment systems. This screw is designed to provide a secure and reliable fastening solution, ensuring that components remain firmly in place under the demanding conditions of engine operation.

Application in Aftertreatment Devices

In aftertreatment devices, the 4389734 Hexagon Flange Head Cap Screw is commonly used to attach critical components such as catalytic converters, diesel particulate filters (DPFs), and selective catalytic reduction (SCR) systems. These components are essential for reducing emissions and ensuring that the engine meets environmental regulations. The screw’s robust design helps maintain the integrity of these attachments, preventing loosening due to vibrations and thermal expansion.

Securing the Aftertreatment Device

The aftertreatment device itself often consists of multiple sub-components that need to be securely fastened together. The 4389734 screw plays a significant role in this process by providing a strong and durable connection. Its hexagonal flange head allows for easy tightening and loosening using standard tools, ensuring that maintenance procedures are straightforward and efficient.

Integration with Engine Systems

Beyond the aftertreatment device, the 4389734 screw is also utilized in various other engine systems where secure fastening is required. For instance, it is often employed in the attachment of sensor housings, fuel injector mounts, and exhaust manifold components. These applications benefit from the screw’s ability to withstand high temperatures and corrosive environments, ensuring long-term reliability.

Enhancing System Performance

By providing a dependable fastening solution, the 4389734 Hexagon Flange Head Cap Screw contributes to the overall performance and durability of engine systems. Its use in aftertreatment devices and other critical components helps maintain the structural integrity and operational efficiency of the engine, ultimately leading to improved performance and reduced maintenance requirements.

Conclusion

The 4389734 Hexagon Flange Head Cap Screw is a vital component in the assembly and maintenance of commercial truck engines, particularly in Cummins’ engine models. Its robust design, ease of installation, and reliable performance make it an essential part for ensuring the structural integrity and operational efficiency of various engine components. Proper installation, regular maintenance, and timely troubleshooting are key to maximizing the lifespan and effectiveness of this critical fastener.