4938699
Studded Flange Cap Screw
Cummins®

The 4938699 Studded Flange Cap Screw is a component manufactured by Cummins, a well-established name in the commercial truck industry. This screw is designed for use in commercial trucks, where it plays a role in securing various components and ensuring the structural integrity of the vehicle.

Basic Concepts

A Studded Flange Cap Screw is a type of fastener that features a threaded stud on one end and a flange on the other. This design allows it to be used in mechanical assemblies where a nut cannot be used on the opposite side of the material being fastened. In the context of a truck’s component system, the studded flange cap screw serves to securely attach parts that require a strong, permanent connection ¹.

Purpose and Role in Truck Operation

This Cummins part is integral to the operation of a truck by securing and maintaining the integrity of various components. It is often used in applications where vibrations and dynamic loads are present, ensuring that parts remain firmly in place under operating conditions. This screw helps in maintaining the alignment and functionality of critical truck components, contributing to the overall safety and performance of the vehicle ².

Key Features

The 4938699 is characterized by several key features that enhance its performance and durability. Its design includes a studded end that threads into a tapped hole, and a flange that provides a large bearing surface to distribute the load and prevent the screw from pulling through the material. The material composition typically includes high-strength steel, which offers resistance to corrosion and wear. Additionally, the screw may have a unique coating or treatment to further improve its durability in harsh environments ³.

Benefits

Utilizing the 4938699 offers several advantages. Its robust design and material composition contribute to improved reliability and enhanced performance in demanding truck applications. Over time, the durability of this screw can lead to potential cost savings by reducing the frequency of replacements and maintenance.

Installation Process

Installing the 4938699 requires careful attention to ensure a secure fit. The process involves threading the stud into a pre-tapped hole and tightening it to the manufacturer’s specified torque. Proper tools, such as a torque wrench, are necessary to achieve the correct tension without over-tightening, which could damage the screw or the component it is securing. Best practices include cleaning the mating surfaces and ensuring that the flange is seated properly against the component to maximize the bearing surface and load distribution.

Troubleshooting and Maintenance

Common issues with the 4938699 may include loosening due to vibrations or corrosion in the threads. Regular inspections can help identify these problems early. Maintenance practices such as applying a thread locker during installation and periodic re-torqueing can prolong the screw’s lifespan and ensure optimal performance. If corrosion is detected, cleaning the affected area and reapplying a protective coating may be necessary.

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 commercial truck industry. The company’s product range includes engines, powertrain components, and aftermarket parts, all of which are designed to meet the rigorous demands of commercial transportation.

Studded Flange Cap Screw 4938699 in Cummins Engines

The 4938699, manufactured by Cummins, is a critical component in several of their engine models. This part is designed to secure flanges and other components, ensuring a tight and reliable connection. Here’s how it fits into various Cummins engines:

B6.7 Series

• B6.7 CM2350: This engine utilizes the 4938699 screw for securing various flanges, ensuring the integrity of connections within the engine’s cooling and exhaust systems.
• QSB6.7 CM2250: In this model, the screw is used to fasten components in the exhaust system, maintaining the structural integrity of the engine.
• QSB6.7 CM2350 B105: Similar to the CM2250, this engine also employs the 4938699 screw for securing flanges, particularly in areas that require high durability and resistance to vibrations.

B135B Series

• B135B: This engine model uses the 4938699 screw to fasten critical components, ensuring that all connections are secure and reliable, which is essential for the engine’s performance.

ISB (Chrysler)

• ISB (Chrysler): Although not a Cummins engine, the ISB model from Chrysler incorporates the 4938699 screw in its design. This part is used to secure various flanges, ensuring the engine’s components remain tightly fastened.

QSB6.7 M CM2250

• QSB6.7 M CM2250: This engine model also relies on the 4938699 screw for securing flanges, particularly in the exhaust system, where durability and resistance to high temperatures are crucial.

The 4938699 Studded Flange Cap Screw is integral to the assembly and maintenance of these engines, ensuring that all flanges and connected components are securely fastened, which is vital for the engine’s overall performance and longevity.

Role of Part 4938699 Studded Flange Cap Screw in Engine Systems

The 4938699 is integral in securing various components within engine systems, ensuring both structural integrity and operational efficiency.

In the breather system, this screw is used to fasten the breather cover, which is essential for maintaining proper pressure within the crankcase. It allows for the release of gases while preventing contaminants from entering the system.

Within the crankcase, the screw plays a role in attaching the crankcase cover. This cover protects the internal components and helps in maintaining the crankcase’s sealed environment, which is vital for the engine’s lubrication system.

For the valve hardware kit, the 4938699 screw is employed to secure valve components, ensuring they remain in place under the high stresses and temperatures encountered during engine operation.

In the assembly of a long block, this screw is utilized to attach various covers and housings, contributing to the overall stability and alignment of the engine’s internal parts.

The screw is also found in plumbing applications related to the engine, where it secures fittings and connections, ensuring there are no leaks in fluid systems such as coolant or oil circuits.

For the crankcase breather system, the screw is used to attach the recirculation valve, which helps in managing the flow of gases and maintaining optimal engine performance.

In exhaust systems, particularly those equipped with a turbocharger, the 4938699 screw is crucial for securing turbocharger components, ensuring they withstand the high pressures and temperatures generated during operation.

Overall, the 4938699 Studded Flange Cap Screw is a versatile fastener that enhances the reliability and performance of various engine components.

Conclusion

The 4938699 Studded Flange Cap Screw is a critical component in the commercial truck industry, particularly in Cummins engines. Its robust design, high-strength material composition, and versatile applications make it essential for securing various components within engine systems. Proper installation, maintenance, and understanding of its role in engine operation are vital for ensuring the longevity and performance of commercial trucks.