3990127
Hexagon Flange Head Cap Screw
Cummins®

This article provides an overview of the Hexagon Flange Head Cap Screw, part number 3990127, manufactured by Cummins. This part is designed for use in commercial trucks and plays a significant role in various truck components.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by a hexagonal head and a flange below the head. The hexagonal head allows for easy tightening and loosening using a wrench or socket, while the flange provides additional surface area to distribute the load and prevent the screw from sinking into the material ¹.

Purpose and Function

The 3990127 Hexagon Flange Head Cap Screw is utilized in commercial trucks for securing various components. It is commonly used in applications where a combination of high tensile strength and resistance to loosening is required. The screw helps in maintaining the integrity of truck assemblies by providing a secure and stable connection ².

Key Features

• Hexagonal head for easy tool engagement
• Flange below the head to distribute load and prevent sinking
• High tensile strength suitable for heavy-duty applications
• Corrosion-resistant properties to ensure longevity in various environments

Benefits

• Enhanced security in fastening applications
• Improved load distribution due to the flange
• Durability and reliability in heavy-duty truck environments
• Resistance to corrosion, extending the service life of the fastener

Troubleshooting and Maintenance

Regular inspection of the Hexagon Flange Head Cap Screw is recommended to ensure it remains secure and free of corrosion. If loosening is detected, re-tightening with the appropriate torque specifications is advised. In cases of significant corrosion or damage, replacement of the screw may be necessary to maintain the integrity of the assembly ³.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. The company is known for its commitment to quality and innovation in the automotive and heavy-duty truck industries.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw Part 3990127

The Cummins Hexagon Flange Head Cap Screw part number 3990127 is a versatile component designed to fit various Cummins engines. This screw is engineered to provide a secure fastening solution in multiple engine applications, ensuring reliability and durability. Below is a detailed overview of the engines compatible with this part.

Cummins B-Series Engines

• B4.5 RGT
• B5.6 CM2670 B152B
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

Cummins ISB Engines

• ISB (Chrysler)
• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB5.9 CM2880 B110
• ISB5.9 CM2880 B140
• ISB5.9 CM2880 B149
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118

Cummins ISBE Engines

• ISBE CM2150
• ISBE CM800
• ISBE4 CM850

Cummins ISD Engines

• ISD4.5 CM2220 D108

Cummins QSB Engines

• QSB4.5 CM2250 EC

The part 3990127 is designed to meet the stringent requirements of Cummins engines, providing a reliable fastening solution across a wide range of engine models. Its compatibility with multiple engine series underscores its versatility and importance in maintaining the integrity and performance of Cummins engines.

Role of Part 3990127 Hexagon Flange Head Cap Screw in Engine Systems

The 3990127 Hexagon Flange Head Cap Screw is a versatile fastener utilized in various engine components to ensure secure and reliable connections. Its design allows for efficient torque application and resistance to loosening, making it suitable for high-stress environments within engine systems.

Assembly and Long Block Integration

In engine assemblies and long blocks, the 3990127 screw is often employed to fasten critical components such as the rocker lever assembly to the engine block. This ensures that the assembly remains firmly in place during operation, contributing to the overall stability and performance of the engine.

Rocker Lever and Support

The screw plays a significant role in securing the rocker lever to its support structure. This connection is vital for maintaining the precise alignment and operation of the rocker lever, which is responsible for transferring motion from the camshaft to the valves. The flange head of the screw provides additional surface area for torque application, reducing the risk of stripping or loosening over time.

Fuel Filter Attachment

In some engine designs, the 3990127 screw is used to attach the fuel filter to the engine block or fuel system components. This secure attachment is essential for maintaining the integrity of the fuel filtration system, ensuring clean fuel delivery to the engine’s combustion chambers.

Long Block Kit Applications

When assembling long block kits, the 3990127 screw is frequently used to fasten various components, including the rocker lever assembly and support structures. Its robust design ensures that these components remain securely attached throughout the engine’s operation, contributing to the longevity and reliability of the long block kit.

Summary of Component Usage

• Assembly: Secures components within the engine assembly, ensuring structural integrity.
• Long Block: Integral in fastening components in long block configurations.
• Rocker Lever: Attaches the rocker lever to its support, maintaining alignment and function.
• Fuel Filter: Used in securing the fuel filter to the engine or fuel system.
• Long Block Kit: Essential for assembling and securing components in long block kits.

Conclusion

The 3990127 Hexagon Flange Head Cap Screw’s reliable performance and secure fastening capabilities make it an indispensable component in various engine systems, contributing to the efficient and durable operation of the engine.