3991306
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, specifically Part #3991306 by Cummins, is a significant component in the realm of commercial trucks. Cummins, a renowned manufacturer in the automotive industry, produces this screw, which is integral to the structural integrity and operational efficiency of trucks. This overview delves into the specifics of the Hexagon Flange Head Cap Screw, its design, functionality, and the role it plays in truck operations.

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 a larger bearing surface, distributing load more effectively. In mechanical systems, these screws are used to secure components, ensuring stability and alignment. The design of the Hexagon Flange Head Cap Screw facilitates both installation and removal, making it a preferred choice in various industrial applications.

Role in Truck Operation

The 3991306 Hexagon Flange Head Cap Screw by Cummins is specifically designed for use in commercial trucks. It plays a role in securing critical components, contributing to the overall structural integrity of the vehicle. Its application ranges from fastening engine components to securing chassis parts, ensuring that all elements remain firmly in place under various operational conditions. This screw is particularly important in environments where vibrations and dynamic loads are common, as it helps maintain the alignment and stability of truck components.

Key Features

The 3991306 Hexagon Flange Head Cap Screw boasts several key features that enhance its performance and reliability. Its hexagonal head design allows for precise torque application, reducing the risk of over-tightening or stripping. The flange at the base of the screw provides additional surface area, which helps in distributing the load more evenly across the fastened components. Additionally, the screw is crafted from high-quality materials, offering excellent resistance to corrosion and wear, which is crucial for longevity in demanding truck applications.

Benefits

The benefits of using the 3991306 Hexagon Flange Head Cap Screw are manifold. One of the primary advantages is enhanced fastening security. The combination of the hexagonal head and flange design ensures that the screw remains tightly in place, even under significant stress and vibration. This screw also offers ease of installation and removal, which is beneficial during maintenance procedures. Furthermore, its resistance to corrosion and wear contributes to the longevity of the fastening, reducing the need for frequent replacements.

Installation and Usage

Proper installation of the 3991306 Hexagon Flange Head Cap Screw is crucial for optimal performance. It is recommended to use the appropriate torque specifications provided by Cummins to ensure that the screw is neither under-tightened nor over-tightened. Best practices include using a torque wrench for accurate application and verifying that the flange is properly seated against the fastened component. Regular inspection during maintenance checks can help identify any signs of wear or loosening, ensuring continued reliability.

Troubleshooting and Maintenance

Common issues with the 3991306 Hexagon Flange Head Cap Screw may include loosening due to vibration or corrosion. Regular inspections during maintenance intervals can help identify these issues early. If corrosion is detected, it may be necessary to replace the screw to prevent further degradation. Additionally, ensuring that the screw is properly torqued during installation can mitigate the risk of loosening over time. Maintenance practices should include checking for any signs of wear or damage to both the screw and the fastened components.

Cummins Overview

Cummins is a well-established manufacturer with a strong reputation in the automotive and heavy-duty truck industries. The company has a history of innovation and commitment to quality, which is reflected in its product lineup. Cummins’ dedication to research and development ensures that its components, including the 3991306 Hexagon Flange Head Cap Screw, meet the highest standards of performance and reliability. Their focus on customer satisfaction and continuous improvement underscores their position as a leader in the industry.

Hexagon Flange Head Cap Screw 3991306 in Cummins Engines

The Cummins Hexagon Flange Head Cap Screw part number 3991306 is a critical component used in various Cummins engines. This screw is designed to provide a secure fastening solution, ensuring that components remain tightly secured under operational stresses. Below is a detailed description of how this part integrates with different Cummins engines:

4B3.9 and 6B5.9 Engines

In the 4B3.9 and 6B5.9 engines, the 3991306 screw is often used in applications where a robust and reliable fastening method is required. These engines, known for their durability and performance, benefit from the screw’s ability to maintain tight connections in high-stress environments.

6C8.3 and 8.3 Series Engines

The 6C8.3 and 8.3 series engines, including models like B3.9 G, B4.5, B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556, C GAS PLUS CM556, C8.3 G, G5.9, G5.9 CM558, G8.3, G8.3 CM558, GTA8.3 CM558, utilize the 3991306 screw in various applications. These engines often require precise fastening to ensure optimal performance and longevity. The screw’s design allows for easy installation and removal, which is crucial during maintenance and repair operations.

ISB Series Engines

The ISB series engines, such as ISB CM550, ISB3.9 CM2220 B107, ISB5.9 CM2880 B127, ISB5.9G CM2180, incorporate the 3991306 screw in several key areas. These engines are known for their efficiency and power, and the screw’s ability to provide a secure fastening is essential for maintaining the integrity of critical components.

ISC Series Engines

In the ISC series engines, including ISC CM2150, ISC CM554, ISC CM850, and ISC8.3 CM2250, the 3991306 screw is used in various applications. These engines are designed for heavy-duty use, and the screw’s strength and reliability make it an ideal choice for securing components under heavy loads.

ISL Series Engines

The ISL series engines, such as ISL CM2150 and ISL CM554, also benefit from the use of the 3991306 screw. These engines are known for their durability and performance, and the screw’s ability to provide a secure fastening is crucial for maintaining the integrity of the engine’s components.

The 3991306 screw’s compatibility across these various engine models highlights its versatility and importance in ensuring the reliable operation of Cummins engines.

Role of Part 3991306 Hexagon Flange Head Cap Screw in Engine Systems

The 3991306 Hexagon Flange Head Cap Screw is a versatile fastener utilized in various engine components to ensure secure assembly and reliable operation. Its application spans across multiple critical areas within the engine system, contributing to the overall integrity and performance of the engine.

Crankcase Breather

In the crankcase breather system, the 3991306 screw is employed to fasten components that allow for the release of pressure built up within the crankcase. This helps in maintaining optimal pressure levels, which is essential for the efficient operation of the engine.

Cylinder Block

Within the cylinder block, this screw plays a role in securing various attachments and accessories. It ensures that all components are firmly in place, which is vital for the structural stability of the block and the precision of the engine’s operation.

Engine Mounting

For engine mounting, the 3991306 screw is used to attach the engine to the vehicle’s frame. This secure attachment is necessary for absorbing vibrations and ensuring that the engine remains stable during operation.

Flywheel Housing

In the flywheel housing, this screw is critical for fastening the housing to the engine. It ensures that the flywheel is properly aligned and secured, which is important for the smooth transfer of power from the engine to the transmission.

Flywheel Housing Mounting

Similarly, in the context of flywheel housing mounting, the screw is used to secure the housing to other engine components. This ensures that the flywheel housing remains in the correct position, contributing to the efficient operation of the engine.

Flywheel

When it comes to the flywheel itself, the 3991306 screw may be used in the attachment of the flywheel to the crankshaft or other components. This secure attachment is essential for the flywheel’s role in storing rotational energy and smoothing out the power delivery of the engine.

Housing

In general housing applications, this screw is used to fasten various engine housings, ensuring that they are securely in place. This is important for protecting internal components and maintaining the structural integrity of the engine.

Fuel Shutoff Valve

For the fuel shutoff valve, the 3991306 screw is utilized to secure the valve in place. This ensures that the valve operates correctly, allowing for the precise control of fuel flow to the engine.

Housing Flywheel Mounting and Housing Mounting Flywheel

In both housing flywheel mounting and housing mounting flywheel applications, this screw is essential for securing the housing to the flywheel or vice versa. This secure attachment is necessary for the proper functioning of the flywheel and the overall engine system.

Radiator Mounting

In radiator mounting, the 3991306 screw is used to attach the radiator to the engine or vehicle frame. This secure attachment is necessary for the radiator’s role in cooling the engine and maintaining optimal operating temperatures.

Rear Cover

Finally, in the rear cover of the engine, this screw is used to secure the cover in place. This is important for protecting internal components and ensuring the structural integrity of the engine.

Throughout these applications, the 3991306 Hexagon Flange Head Cap Screw demonstrates its importance in securing and maintaining the structural integrity and operational efficiency of various engine components.

Conclusion

The 3991306 Hexagon Flange Head Cap Screw by Cummins is a critical component in the automotive industry, particularly in commercial trucks and various Cummins engines. Its design, featuring a hexagonal head and flanged base, ensures efficient torque application and effective load distribution. The screw’s high-quality materials provide excellent resistance to corrosion and wear, contributing to its longevity and reliability in demanding applications. Proper installation and regular maintenance are essential for optimal performance, ensuring that the screw remains securely in place under operational stresses. Cummins’ commitment to quality and innovation is evident in the design and functionality of this part, underscoring its importance in the reliable operation of commercial trucks and engines.