3921851
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw, specifically Part #3921851 by Cummins, is a component designed for use in commercial trucks. Cummins, a well-established manufacturer in the automotive industry, produces this screw to meet the demanding requirements of heavy-duty applications. This part plays a role in ensuring the structural integrity and operational efficiency of various truck components.

Basic Concepts of Hexagon Flange Head Cap Screw

A Hexagon Flange Head Cap Screw is characterized by its hexagonal head and a flange beneath the head. This design allows for secure fastening and provides a larger surface area for distribution of clamping force. Typically, these screws are made from materials such as alloy steel or stainless steel, chosen for their strength and resistance to corrosion. In the automotive industry, they are commonly used to fasten components that require high tensile strength and resistance to vibration ¹.

Purpose and Role in Truck Operation

The 3921851 Hexagon Flange Head Cap Screw is specifically engineered for use in commercial trucks. It serves to securely fasten critical components, ensuring they remain in place under the dynamic and often harsh conditions encountered in trucking operations. By providing a stable and reliable connection, this screw contributes to the overall safety and performance of the truck ².

Key Features

The 3921851 Hexagon Flange Head Cap Screw features a hexagonal head, which allows for efficient tightening using a wrench or socket. The flange beneath the head distributes the clamping force over a larger area, reducing the risk of damage to the fastened material. Additionally, the screw is designed with precision to ensure compatibility with various truck components, enhancing its versatility and reliability in heavy-duty applications.

Benefits

Using the 3921851 Hexagon Flange Head Cap Screw offers several advantages. Its design provides improved fastening security, making it less likely to loosen over time, even under vibration. The material used in its construction ensures durability and resistance to corrosion, which is vital in the demanding environment of commercial trucking. Furthermore, the flange head design helps in distributing the load more evenly, reducing the stress on the fastened components.

Installation Considerations

Proper installation of the 3921851 Hexagon Flange Head Cap Screw is crucial for its performance and longevity. It is important to follow torque specifications provided by the manufacturer to ensure the screw is tightened to the correct level without over-tightening, which could lead to damage. Alignment with the fastened components should be precise to ensure even distribution of clamping force. Compatibility with other components must also be verified to prevent issues during operation.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws may include loosening due to vibration or corrosion. Regular inspection and maintenance can help identify these issues early. If a screw appears loose, it should be re-tightened to the specified torque. In cases of corrosion, the affected screw may need to be replaced to ensure continued reliability. Proper lubrication and protection against environmental factors can also extend the lifespan of these screws.

Cummins: Manufacturer Overview

Cummins Inc. is a renowned manufacturer with a long-standing reputation in the automotive industry. The company is known for its commitment to producing high-quality components that meet the rigorous demands of commercial applications. Cummins’ history of innovation and dedication to excellence ensures that their products, like the 3921851 Hexagon Flange Head Cap Screw, are reliable and perform well under challenging conditions ³.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw (Part 3921851)

The Cummins Hexagon Flange Head Cap Screw (Part 3921851) is a versatile component designed to fit a variety of Cummins engines. This part is engineered to provide a secure and reliable fastening solution, ensuring proper assembly and operation of the engine components.

4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines, both part of the Cummins B Series, benefit from the use of the Hexagon Flange Head Cap Screw. This screw is particularly useful in securing various engine components, ensuring that they remain tightly fastened during operation. Its design allows for easy installation and removal, making maintenance and repairs more efficient.

6C8.3 and QSB5.9 44 CM550 Engines

Similarly, the 6C8.3 and QSB5.9 44 CM550 engines also utilize the Hexagon Flange Head Cap Screw. This part is critical in maintaining the structural integrity of these engines, particularly in areas where high torque and vibration are common. The screw’s flange head provides a larger surface area for better torque distribution, enhancing the overall performance and longevity of the engine.

ISB CM550, ISC CM850, and QSC8.3 CM850 (CM2850) Engines

The ISB CM550, ISC CM850, and QSC8.3 CM850 (CM2850) engines are part of the Cummins C Series. The Hexagon Flange Head Cap Screw is essential in these engines for securing various components, including those in the cylinder head and engine block. Its design ensures that these parts remain securely fastened, even under the high-stress conditions typical of these engines.

ISL9 CM2150 SN, QSK45 CM500, QSK60 CM500, and QSK60 CM850 MCRS Engines

The ISL9 CM2150 SN, QSK45 CM500, QSK60 CM500, and QSK60 CM850 MCRS engines are part of the Cummins K Series. These engines benefit from the use of the Hexagon Flange Head Cap Screw in several critical areas. The screw is used to secure components that are subject to high stress and vibration, ensuring that the engine operates smoothly and efficiently.

QSK60G, QST30 CM552, and QSX15 CM2250 ECF Engines

The QSK60G, QST30 CM552, and QSX15 CM2250 ECF engines are part of the Cummins QSK Series. The Hexagon Flange Head Cap Screw is integral to these engines, providing a reliable fastening solution for various components. Its design ensures that these parts remain securely fastened, even in the demanding environments these engines operate in.

QSK95 CM2350 K111 Engine

The QSK95 CM2350 K111 engine is another member of the Cummins K Series. The Hexagon Flange Head Cap Screw is used in this engine to secure components that are subject to high stress and vibration. Its design ensures that these parts remain securely fastened, contributing to the overall reliability and performance of the engine.

Each of these engines relies on the Hexagon Flange Head Cap Screw to maintain the integrity and performance of their critical components. The screw’s design and material ensure that it can withstand the demanding conditions these engines operate under, providing a reliable fastening solution.

Hexagon Flange Head Cap Screw (Part 3921851) Component Usage

The Hexagon Flange Head Cap Screw (Part 3921851) is integral to the assembly and maintenance of various engine components. Its robust design ensures secure fastening, which is essential for the reliable operation of the engine system.

Accessories and Wiring

In the realm of accessories and wiring, this screw is often employed to secure wiring harnesses and electronic control module wiring. Its flange head provides additional surface area, enhancing the screw’s grip and reducing the risk of loosening over time. This is particularly important in the Electronic Control Module (ECM) wiring, where secure connections are paramount for accurate engine performance monitoring and control.

Aftercooler and Air Heater Starting

For the aftercooler and air heater starting components, the Hexagon Flange Head Cap Screw ensures that these parts are firmly attached to the engine. This is vital for maintaining the efficiency of the aftercooling process, which is essential for reducing the temperature of the compressed air from the turbocharger. Similarly, in the air heater starting system, secure fastening ensures that the heater elements remain in place, providing consistent and reliable starting performance in cold conditions.

Turbocharger and Camshaft Gear

In turbocharger applications, this screw is used to attach the turbocharger to the engine block or manifold. The flange head design allows for a more distributed load, which is beneficial in high-stress environments like those found in turbocharged engines. Additionally, in the camshaft gear arrangement, the screw ensures that the gear cover and front gear are securely fastened, maintaining the precise timing necessary for optimal engine performance.

Doser and Fluid Systems

For components like the fluid doser and associated plumbing, the Hexagon Flange Head Cap Screw plays a role in securing the doser to the engine and ensuring that fluid lines are properly attached. This is important for the consistent delivery of fluids, whether for cooling, lubrication, or emissions control purposes.

Air Cleaner and Valve Systems

In the air cleaner assembly, this screw is used to secure the cover and ensure that the air filter is properly housed. This is essential for maintaining the cleanliness of the air entering the engine, which directly impacts performance and longevity. Similarly, in valve systems, particularly the fuel shutoff valve, secure fastening is necessary to prevent leaks and ensure that the valve operates correctly under all conditions.

Overall, the Hexagon Flange Head Cap Screw (Part 3921851) is a versatile and reliable component that enhances the integrity and performance of various engine systems. Its application across different components underscores its importance in maintaining the overall functionality and efficiency of the engine.

Conclusion

The Hexagon Flange Head Cap Screw (Part 3921851) by Cummins is a critical component in the assembly and maintenance of commercial truck engines. Its robust design, material strength, and versatile application make it essential for ensuring the structural integrity and operational efficiency of various engine components. Proper installation, regular maintenance, and understanding its role in different engine systems are key to maximizing the performance and longevity of this Cummins part.