3937181
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw, part number 3937181, is a crucial component in the maintenance and assembly of commercial trucks. Manufactured by Cummins, a prominent name in the industry, this screw is utilized in various applications within the truck industry, ensuring the secure fastening of components.

Basic Concepts of Hexagon Flange Head Cap Screws

A Hexagon Flange Head Cap Screw is distinguished by its hexagonal head and a flange beneath the head. This design facilitates efficient torque application and provides a larger bearing surface, which distributes the load more evenly ¹. In the automotive industry, flange head cap screws are commonly used for their ability to resist loosening under vibration and their ease of installation and removal ².

Purpose and Role in Truck Operation

The 3937181 Hexagon Flange Head Cap Screw is specifically designed for use in commercial trucks. It contributes to the secure fastening of various truck components, ensuring that parts remain firmly in place under operational stress. This screw is integral to the assembly and maintenance of truck components, providing a reliable fastening solution that can withstand the rigors of heavy-duty use ³.

Key Features

The 3937181 Hexagon Flange Head Cap Screw features a hexagonal head that allows for precise torque application using standard tools. The flange beneath the head provides an increased bearing surface, enhancing the screw’s ability to distribute loads evenly. Crafted from high-quality materials, this screw offers excellent resistance to corrosion and wear, ensuring durability and reliability in demanding environments.

Benefits

Using the 3937181 Hexagon Flange Head Cap Screw offers several advantages. Its design enhances fastening security, making it less prone to loosening under vibration. The ease of installation and removal simplifies maintenance procedures. Additionally, its resistance to corrosion ensures longevity, even in harsh operating conditions.

Installation and Usage

Proper installation of the 3937181 Hexagon Flange Head Cap Screw involves adhering to specified torque values to ensure secure fastening without over-tightening. Best practices include using the correct tools and ensuring that the screw is installed in a clean, undamaged thread. This screw is commonly applied in various truck maintenance and repair scenarios, providing a reliable fastening solution.

Troubleshooting and Maintenance

Common issues with the 3937181 Hexagon Flange Head Cap Screw may include loosening or corrosion. Regular inspection and maintenance can help identify and address these issues promptly. Ensuring that screws are tightened to the correct torque and protected from corrosive environments can enhance their performance and longevity.

Cummins: Manufacturer Overview

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its commitment to quality and innovation. With a diverse product range, Cummins has established a reputation for producing reliable and high-performance truck components. The company’s dedication to excellence is evident in its manufacturing processes and the durability of its products.

Compatibility with Cummins Engines

The Hexagon Flange Head Cap Screw, part number 3937181, is compatible with a wide range of Cummins engines, including small, medium, and large bore engines. This screw provides a secure fastening solution, ensuring that components remain tightly secured under various operational conditions.

Small Bore Engines

• B3.3
• B5.9 G
• B5.9 GAS PLUS CM556
• QSB3.3 CM2150
• QSB3.3 CM2250 EC

Medium Bore Engines

• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• ISB CM2150
• ISB CM550
• ISB CM850
• ISF3.8 CM2220 AN
• ISF3.8 CM2220 F103
• ISF3.8 CM2350 F109
• ISF4.5 CM2220 F123
• ISBE CM2150
• ISBE4 CM850

Large Bore Engines

• D4.0 CM2620 D103B
• F3.8 CM2350 F120B
• F3.8 F102
• F4.5 CM2620 F139B
• G8.3
• ISB (Chrysler)
• ISB/ISD4.5 CM2150 B119
• ISB6.7 CM2250

Role in Engine Systems

The 3937181 Hexagon Flange Head Cap Screw is integral in securing and maintaining the integrity of various components within engine systems. Its robust design ensures reliable fastening in high-stress environments.

Turbocharger and Compressor Systems

In turbocharger arrangements, this screw is utilized to secure the compressor housing to the turbine housing. It ensures that the components remain aligned and sealed, which is essential for efficient air compression and turbine operation.

Refrigerant and Air Intake Connections

For refrigerant systems, the screw plays a role in securing connections between the refrigerant lines and the compressor. This ensures a leak-free seal, which is vital for maintaining the system’s efficiency and preventing refrigerant loss.

In air intake systems, the screw is often used to mount the air intake components to the engine block or manifold. This secure attachment is necessary to withstand the vibrations and pressures generated during engine operation, ensuring a consistent airflow into the combustion chambers.

Gauge and Oil Level Monitoring

The screw is also employed in the installation of oil level gauges and other monitoring instruments. By securely fastening these gauges to the engine block or pan, it ensures accurate readings and reliable operation, which are essential for maintaining optimal engine performance and longevity.

Governor and Electronic Systems

In governor systems, the screw is used to attach the governor housing to the engine, ensuring precise control over engine speed and performance. Similarly, in electronic systems, it secures various sensors and components, maintaining their position and functionality amidst the dynamic conditions within the engine compartment.

Fuel Filter and Alternator Mounting

The screw is crucial in the mounting of fuel filters, ensuring they remain securely in place to filter fuel efficiently before it reaches the engine. Additionally, it is used in alternator mounting, providing a stable attachment that can endure the mechanical stresses and vibrations generated during engine operation.

Pan and Oil Systems

In oil systems, the screw is utilized to secure the oil pan to the engine block. This attachment is vital for containing the engine oil and ensuring it is available for lubrication under all operating conditions. The screw’s design helps in maintaining a tight seal, preventing oil leaks that could lead to engine damage.

Conclusion

The 3937181 Hexagon Flange Head Cap Screw is a versatile and reliable fastener that enhances the reliability and performance of various engine components by providing secure and stable attachments. Its compatibility with a wide range of Cummins engines and its robust design make it an essential component in the maintenance and operation of commercial trucks.