3921742
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3921742, is a component manufactured by Cummins, a renowned name in the automotive and heavy-duty truck industry. This screw is significant in commercial trucks due to its robust design and reliable performance. Cummins, known for its high-quality automotive components, ensures that this screw meets the demanding requirements of truck operations ¹.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by its hexagonal head and flanged base. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area to distribute load and prevent the screw from sinking into the material. In mechanical systems, this screw is used to secure components together, ensuring stability and integrity under various operational conditions ².

Purpose and Role in Truck Operation

This Cummins part plays a specific role in the operation of a truck by securing critical components that are subject to vibration and stress. Its applications range from fastening engine parts to securing chassis components. The screw’s design ensures that it remains tightly in place, contributing to the overall reliability and safety of the truck ³.

Key Features

The 3921742 boasts several key features that enhance its performance. Its hexagonal head design allows for precise torque application, reducing the risk of over-tightening or stripping. The flange characteristic provides additional stability by distributing the load more evenly. Additionally, the screw is made from high-quality materials that offer excellent resistance to corrosion and wear, ensuring longevity in harsh operating environments.

Benefits

The benefits of using the 3921742 include enhanced stability in fastening applications, improved torque application due to its hexagonal head, and resistance to loosening over time. These features contribute to the screw’s reliability and durability, making it a preferred choice for critical truck components.

Installation and Usage

Proper installation of the 3921742 is crucial for its performance. It is recommended to use the appropriate torque settings to ensure the screw is tightened to the manufacturer’s specifications without over-tightening. This screw is suitable for various application scenarios where secure fastening is required, such as in engine assemblies and chassis components.

Troubleshooting and Maintenance

Common issues with the 3921742 may include loosening due to vibration or corrosion over time. Regular inspection and maintenance can help identify these issues early. If loosening is detected, re-tightening to the recommended torque settings is advised. Additionally, applying an anti-corrosion coating can help extend the screw’s lifespan in corrosive environments.

Cummins Overview

Cummins is a well-established manufacturer with a long history of producing high-quality automotive components. The company is known for its commitment to innovation and excellence, ensuring that its products, including the 3921742, meet the rigorous demands of commercial truck applications. Cummins’ reputation for quality and reliability makes it a trusted name in the industry.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw Part 3921742

The Cummins Hexagon Flange Head Cap Screw part number 3921742 is a versatile component designed to fit a variety of Cummins engines. This screw is integral in securing various parts within the engine assembly, ensuring structural integrity and operational efficiency. Here is a detailed look at the compatibility of this screw with different Cummins engines:

Cummins ISB Series

• ISB CM550
• ISB CM554
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• ISBE CM800
• ISG11 CM2880 G108
• ISG12 CM2880 G107
• ISG12 G CMOH6.0 G111
• ISL CM554
• ISL9 CM2150 SN
• ISZ13 CM2150 Z105

The ISB series engines, including the ISB CM550, ISB CM554, and others, utilize the 3921742 screw in various applications. This screw is often used in securing cylinder heads, engine blocks, and other critical components, ensuring that these parts remain tightly fastened under high operational stresses.

Cummins ISC Series

• ISC CM554
• ISC CM850

The ISC series engines, such as the ISC CM554 and ISC CM850, also benefit from the use of the 3921742 screw. This screw is typically employed in securing components such as turbochargers, intake manifolds, and other auxiliary parts, providing the necessary stability and durability.

Cummins ISF Series

• ISF2.8 CM2220 F129

The ISF2.8 CM2220 F129 engine incorporates the 3921742 screw in its assembly. This screw is used in securing various engine components, ensuring that the engine operates smoothly and efficiently.

Cummins QSB Series

• QSB5.9 44 CM550
• QSB5.9 CM2880 B139
• QSB5.9 CM550
• QSB5.9 CM850

The QSB5.9 series engines, including the QSB5.9 44 CM550 and QSB5.9 CM2880 B139, use the 3921742 screw in various applications. This screw is crucial in securing engine blocks, cylinder heads, and other vital parts, ensuring the engine’s structural integrity.

Cummins QSC Series

• QSC8.3 CM554
• QSC9 CM2250/QSL9 CM2250

The QSC8.3 CM554 and QSC9 CM2250/QSL9 CM2250 engines also utilize the 3921742 screw. This screw is used in securing various components, ensuring the engine’s operational efficiency and durability.

Cummins L8.9G CMOH2.0 L125B

The L8.9G CMOH2.0 L125B engine incorporates the 3921742 screw in its assembly. This screw is used in securing critical components, ensuring the engine’s structural integrity and operational efficiency.

Hexagon Flange Head Cap Screw (Part 3921742) Component Usage

The Hexagon Flange Head Cap Screw, identified by part number 3921742, is a versatile fastener utilized in various components of engine systems. Its primary role is to securely fasten components together, ensuring structural integrity and proper function of the engine system.

Key Applications:

1. Adapter and Front Drive Assembly:

   • The screw is used to attach the adapter to the front drive assembly, ensuring a stable connection that can withstand the dynamic forces generated during engine operation.

2. Air Assembly Cleaner Arrangement:

   • In the air assembly cleaner arrangement, the screw secures components that are essential for maintaining clean air intake, which is vital for optimal engine performance.

3. Turbocharger and Cylinder Block:

   • Within the turbocharger system, the screw fastens critical components, ensuring that the turbocharger operates efficiently. Similarly, in the cylinder block, it secures parts that are integral to the engine’s combustion process.

4. Marine Gear Oil Cooler:

   • The screw is employed in the marine gear oil cooler to maintain the structural integrity of the cooler, which is essential for dissipating heat from the gear oil.

5. Electronic Control Module Wiring Harness:

   • It secures the electronic control module wiring harness in place, ensuring that electrical connections remain intact and function correctly.

6. Fuel Filter and Oil Level Gauge:

   • The screw is used to fasten the fuel filter, ensuring it remains securely in place to filter contaminants from the fuel. Additionally, it secures the oil level gauge, which is crucial for monitoring the engine’s oil levels.

7. Throttle Lever and Drain Location:

   • In the throttle lever arrangement, the screw ensures the lever is securely attached, allowing for precise control of the engine’s throttle. It also secures components at the drain location, facilitating efficient fluid drainage.

8. Engine Control Module and Auxiliary Pump Plumbing:

   • The screw is integral in fastening the engine control module, ensuring it remains securely in place. It also secures components in the auxiliary pump plumbing, maintaining the integrity of the pump system.

9. Injector Plumbing and Exhaust Recirculation:

   • In injector plumbing, the screw ensures that injectors are securely fastened, which is essential for precise fuel delivery. It also plays a role in securing components in the exhaust recirculation system, helping to reduce emissions.

10. Turbocharger Plumbing:

    • The screw is used in turbocharger plumbing to secure fittings and connections, ensuring that the turbocharger system operates efficiently and reliably.

Conclusion

The Hexagon Flange Head Cap Screw (part 3921742) is a critical component in maintaining the structural and functional integrity of various engine systems. Its applications across different components highlight its importance in ensuring the engine operates smoothly and efficiently.