3943933
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3943933, is a critical component manufactured by Cummins. This screw is essential in commercial truck maintenance, securing various components within the truck’s mechanical systems. Cummins, a renowned industry leader, ensures this part meets high standards of quality and performance.

Basic Concepts

A Hexagon Flange Head Cap Screw is a fastener characterized by its hexagonal head and flange. The hexagonal head allows for efficient tightening and loosening using a wrench or socket, providing a secure grip that minimizes the risk of cam-out. The flange, a flat, circular plate at the head’s base, distributes the load more evenly across the surface it contacts, reducing the likelihood of the screw pulling through the material. This design is particularly beneficial in applications where vibration and dynamic loads are common ¹.

Role in Truck Operation

The 3943933 Hexagon Flange Head Cap Screw plays a crucial role in truck operation by securing critical components in place. Its applications range from fastening engine parts to securing chassis components. By ensuring these parts remain firmly in place, the screw contributes to the structural integrity and performance of the truck. This is especially important in heavy-duty applications where components are subjected to significant stress and vibration ².

Key Features

The 3943933 Hexagon Flange Head Cap Screw is crafted from high-quality materials, typically a grade of steel that offers excellent strength and durability. Its threading is designed to provide a strong, secure hold, resistant to loosening under vibration. The screw’s unique design elements, such as the hexagonal head and flange, enhance its functionality by facilitating easy installation and removal while ensuring a secure fit ³.

Benefits

Using the 3943933 Hexagon Flange Head Cap Screw offers several advantages. The screw’s design improves fastening security, making it less likely to loosen over time compared to standard screws. Its resistance to vibration is particularly beneficial in the demanding environment of a commercial truck, where components are constantly subjected to movement and stress. Additionally, the ease of installation and removal simplifies maintenance procedures, allowing for quicker and more efficient repairs.

Troubleshooting and Maintenance

Common issues associated with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion in harsh environments. To troubleshoot these issues, it is important to ensure that the screw is tightened to the manufacturer’s recommended torque settings. Regular inspection routines should be established to check for signs of corrosion or damage. Maintenance tips include applying an anti-seize compound to the threads to prevent corrosion and using a torque wrench to ensure proper tightening.

About Cummins

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 commitment to excellence is evident in its rigorous manufacturing processes and continuous investment in research and development, ensuring that its components, like the 3943933 Hexagon Flange Head Cap Screw, meet the highest standards of performance and reliability.

Hexagon Flange Head Cap Screw 3943933 in Cummins Engines

The Hexagon Flange Head Cap Screw 3943933, manufactured by Cummins, is a critical component in various Cummins engine models. This screw is designed to secure flanges and other components, ensuring the structural integrity and operational efficiency of the engine.

ISC Series Engines

The ISC CM2150, ISC CM554, ISC CM850, and ISC8.3 CM2250 engines all utilize the 3943933 screw. These engines are part of the ISC series, known for their robust design and reliability in heavy-duty applications.

ISL Series Engines

Similarly, the ISL CM2150, ISL CM554, ISL G CM2180, ISL9 CM2150 SN, ISL9 CM2250, and ISL9.5 CM2880 L138 engines incorporate this screw. The ISL series is recognized for its high performance and efficiency, making it suitable for a variety of demanding applications.

L Series Engines

The L GAS PLUS CM556, L8.9, L8.9 CM2670 L134C, L8.9 L121, L8.9G CMOH2.0 L125B, L9 CM2670 L128B, and L9.5 L117 engines also feature the 3943933 screw. These engines are part of the L series, which is known for its versatility and adaptability across different industries.

QSC Series Engines

The QSC8.3 CM2880 C102, QSC8.3 CM554, and QSC8.3 CM850(CM2850) engines incorporate the 3943933 screw. The QSC series is designed for applications requiring high power and efficiency, making it a popular choice for various industrial uses.

G Series Engines

The G8.3, G8.3 CM558, and GTA8.3 CM558 engines utilize the 3943933 screw. These engines are part of the G series, which is known for its durability and performance in demanding environments.

This screw is integral to the assembly and maintenance of these engines, ensuring that all components are securely fastened and the engine operates smoothly.

Role of Part 3943933 Hexagon Flange Head Cap Screw in Engine Systems

The 3943933 Hexagon Flange Head Cap Screw is an essential fastening component utilized across various engine systems to ensure secure assembly and reliable operation. Its application spans multiple critical areas, contributing to the overall efficiency and durability of the engine.

Aftercooler

In the aftercooler system, the Hexagon Flange Head Cap Screw is employed to fasten components that facilitate the cooling of compressed air. This ensures that the connections remain tight, preventing any air leaks that could compromise the cooling efficiency and, consequently, the performance of the engine.

Air Crossover Connection

For the air crossover connection, this screw plays a role in securing the crossover pipe that links different air intake paths. A secure fit is vital to maintain consistent airflow distribution, which is essential for balanced engine performance and efficient combustion.

Exhaust Recirculation

In the Exhaust Gas Recirculation (EGR) system, the Hexagon Flange Head Cap Screw is used to attach components that reroute a portion of the exhaust gases back into the intake manifold. This helps in reducing nitrogen oxides emissions. The screw ensures that the EGR valve and associated piping are firmly attached, maintaining the integrity of the recirculation process.

Rocker Lever and Rocker Lever Assembly

Within the valve train mechanism, the Hexagon Flange Head Cap Screw is integral in assembling the rocker lever and rocker lever assembly. It secures the rocker arm to the valve stem and the engine block, ensuring precise valve operation. This is fundamental for maintaining proper valve timing and engine efficiency.

Upfit Kit

In upfit kits, which are used to add aftermarket equipment or modifications to the engine, the Hexagon Flange Head Cap Screw is often utilized to secure additional components. Whether it’s attaching a new air filter housing or securing an upgraded fuel injector, this screw ensures that all modifications are securely integrated into the engine system.

Conclusion

The 3943933 Hexagon Flange Head Cap Screw is a vital component in the maintenance and operation of commercial trucks and Cummins engines. Its design, featuring a hexagonal head and flange, ensures secure fastening and resistance to vibration, making it ideal for heavy-duty applications. Regular maintenance and proper tightening are essential to maximize its benefits and ensure the longevity and performance of the engine systems it supports.