3901408
Hexagon Head Cap Screw
Cummins®

The Cummins 3901408 Hexagon Head Cap Screw is a specialized fastener designed for use in commercial trucks. Cummins, a prominent manufacturer in the commercial trucking industry, produces a range of components that ensure the reliability and efficiency of heavy-duty vehicles. This part is integral to the assembly and maintenance of these trucks, providing secure fastening in various applications.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is characterized by its hexagonal head, which allows for efficient torque application using a wrench or socket. The design ensures a snug fit and reduces the risk of cam-out during tightening. These screws are commonly used in applications requiring strong, permanent fastening, as their threaded shank provides a secure grip within the material being joined.

Purpose of the 3901408 Hexagon Head Cap Screw in Truck Operation

This Cummins part plays a role in the assembly and maintenance of commercial trucks by securing various components. It is utilized in engine assemblies, chassis construction, and other areas where reliable fastening is required. Its design ensures that critical parts remain securely attached, contributing to the overall stability and performance of the vehicle.

Key Features

The 3901408 features a hexagonal head that facilitates easy and precise torque application. It is composed of high-quality materials, typically including alloy steel, which provides strength and durability. The screw has a specific thread type that ensures a secure grip, and it may include additional features such as a countersunk head for flush installation or a coating to enhance corrosion resistance.

Benefits

This part offers several benefits, including improved torque application due to its hexagonal head design. Its material composition and thread type contribute to resistance against loosening, even in dynamic environments. Additionally, the screw is designed to withstand the harsh operating conditions typical of commercial trucking, ensuring longevity and reliable performance.

Installation Guidelines

Proper installation of the 3901408 involves several steps to ensure a secure and reliable fastening. Begin by selecting the appropriate wrench or socket to match the hexagonal head. Apply the screw to the designated location, ensuring that the material being joined is properly aligned. Gradually tighten the screw to the specified torque, using a torque wrench to achieve the recommended setting. This process helps prevent over-tightening, which can lead to damage, and under-tightening, which can result in an insecure fastening.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening and corrosion. To identify these problems, regularly inspect the screws for signs of movement or rust. If loosening is detected, re-tighten the screw to the specified torque. In cases of corrosion, consider replacing the screw to maintain the integrity of the fastening. Regular maintenance, including cleaning and lubrication where appropriate, can help prolong the lifespan of the screw and ensure continued reliable performance.

Cummins: Manufacturer Overview

Cummins Inc. is a leading manufacturer in the commercial trucking industry, known for its commitment to quality and innovation. Founded in 1919, Cummins has a long history of producing reliable and efficient components for heavy-duty vehicles. The company offers a wide range of products, including engines, powertrains, and aftermarket parts, all designed to meet the demanding requirements of commercial trucking. Cummins’ reputation for excellence is built on its dedication to engineering excellence and customer satisfaction, making it a trusted name in the industry.

3901408 Compatibility with Cummins Engines

This Cummins part is a versatile component designed to fit a range of Cummins engines. It is engineered to provide secure fastening in various engine applications, ensuring the integrity and stability of engine components.

Engine Compatibility

The 3901408 screw is compatible with the following engines:

• 4B3.9
• 6B5.9
• 6C8.3
• B3.9 G
• B5.9 G
• B5.9 GAS PLUS CM556
• C GAS PLUS CM556
• C8.3 G
• G5.9
• G5.9 CM558
• G8.3
• ISB5.9G CM2180

Grouping by Engine Series

B Series Engines

• B3.9 G
• B5.9 G
• B5.9 GAS PLUS CM556

C Series Engines

• C GAS PLUS CM556
• C8.3 G

G Series Engines

• G5.9
• G5.9 CM558
• G8.3

ISB Series Engines

• ISB5.9G CM2180

Other Engines

• 4B3.9
• 6B5.9
• 6C8.3

The 3901408 screw is designed to meet the stringent requirements of Cummins engines, ensuring reliable performance and durability in demanding environments.

Role of 3901408 in Engine Systems

The 3901408 is integral to the assembly and maintenance of various engine components. Its primary function is to provide secure fastening, ensuring that parts remain firmly in place under the dynamic conditions of engine operation.

Housing

In the engine housing, the 3901408 screw is used to attach panels and covers. This ensures that the housing remains intact, protecting internal components from external contaminants and maintaining the structural integrity of the engine.

Flywheel

The flywheel is a key component in the engine’s drive system, and the 3901408 screw plays a role in securing the flywheel to the crankshaft. This connection is vital for smooth operation, as it helps in maintaining the flywheel’s alignment and balance, which are essential for consistent engine performance.

Panel

Engine panels, which often cover various components for protection and aerodynamic purposes, are fastened using the 3901408 screw. This ensures that panels remain securely in place, reducing the risk of panel displacement during engine operation.

Noise Reduction

In noise reduction systems, the 3901408 screw is employed to attach vibration dampeners and insulation materials. These attachments help in minimizing engine noise and vibrations, contributing to a quieter and more efficient engine operation.

Support Structures

Support structures within the engine, such as brackets and mounts, utilize the 3901408 screw to ensure stability. These structures are essential for maintaining the positional accuracy of moving parts, which is fundamental for the engine’s reliable performance.

Front Engine Components

In the front engine area, the 3901408 screw is used to secure components such as the front cover, sensors, and accessory brackets. This ensures that these components remain fixed, allowing for precise operation and integration with other engine systems.

Overall, the 3901408 Hexagon Head Cap Screw is a versatile fastener that contributes to the secure assembly and efficient operation of various engine components.

Conclusion

The Cummins 3901408 Hexagon Head Cap Screw is a critical component in the assembly and maintenance of commercial trucks and various engine systems. Its design and material composition ensure reliable fastening, contributing to the overall stability and performance of the vehicle. Proper installation and maintenance of this part are essential for ensuring longevity and reliable performance in demanding environments.