3903118
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The 3903118 Hexagon Flange Head Cap Screw is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This screw is designed for use in commercial trucks, where it plays a role in securing various components, ensuring the structural integrity and operational reliability of the vehicle.

Basic Concepts of Hexagon Flange Head Cap Screws

A Hexagon Flange Head Cap Screw is a type of bolt characterized by its hexagonal head and a flange beneath the head. This design 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. These screws are commonly used in mechanical assemblies to secure components that require a high degree of stability and resistance to vibration.

Purpose and Role in Truck Operation

In the context of commercial trucks, the 3903118 Hexagon Flange Head Cap Screw serves to secure critical components, contributing to the overall functionality and reliability of the truck. It is often used in applications where components are subjected to significant stress and vibration, such as in the engine compartment or chassis. By providing a secure and stable connection, this screw helps maintain the integrity of the truck’s structure and ensures that components remain properly aligned and functional ².

Key Features

The 3903118 Hexagon Flange Head Cap Screw features a robust design that includes a hexagonal head for easy manipulation and a flange that enhances its load-bearing capabilities. It is typically made from high-strength materials, such as alloy steel, to ensure durability and resistance to wear. The screw’s design also includes features that enhance its performance in heavy-duty applications, such as a precision-machined thread that ensures a tight and secure fit ³.

Benefits

Using the 3903118 Hexagon Flange Head Cap Screw offers several benefits. Its high-strength material composition provides improved durability, making it suitable for use in demanding environments. The screw’s design also offers resistance to vibration, which is crucial in commercial trucks where components are constantly subjected to movement and stress. Additionally, the hexagonal head and flange design facilitate ease of installation and removal, allowing for efficient maintenance and repair procedures ⁴.

Troubleshooting and Maintenance

Common issues that may arise with the 3903118 Hexagon Flange Head Cap Screw include signs of wear, corrosion, or loosening. Regular inspection for these issues is recommended to ensure the screw remains in optimal condition. Maintenance practices should include cleaning the screw and its surrounding area to prevent corrosion, as well as periodically checking the torque to ensure it remains properly secured. In cases where corrosion or significant wear is observed, replacement of the screw may be necessary to maintain the integrity of the truck’s components ⁵.

Installation Guidelines

Proper installation of the 3903118 Hexagon Flange Head Cap Screw involves several steps to ensure a secure and lasting connection. Begin by cleaning the installation area to remove any debris or corrosion. Use a wrench or socket to insert the screw into the designated hole, ensuring it is aligned correctly. Gradually tighten the screw to the specified torque, using a torque wrench to achieve the correct tension without over-tightening, which could damage the screw or the component it is securing. It is also important to avoid cross-threading by ensuring the screw is properly aligned with the thread in the hole ⁶.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including diesel and natural gas engines, as well as related technologies. With a history spanning over a century, Cummins has established a reputation for innovation, quality, and reliability in the commercial truck industry. The company’s expertise in engine technology and components, including fasteners like the 3903118 Hexagon Flange Head Cap Screw, underscores its commitment to enhancing the performance and durability of commercial vehicles ⁷.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw Part 3903118

The Cummins part 3903118, a Hexagon Flange Head Cap Screw, is a versatile component designed to fit a variety of Cummins engines. This screw is integral to the assembly and maintenance of several engine models, ensuring secure fastening in critical applications.

ISB and ISBE Series Engines

The ISB and ISBE series engines, which include the ISB CM2150, ISB CM550, ISB6.7 CM2250, ISBE CM2150, and ISBE CM800, all utilize the 3903118 screw. These engines are known for their robust performance and are used in a variety of applications, from heavy-duty trucks to industrial machinery. The screw’s design allows for precise and reliable fastening, crucial for maintaining engine integrity under high stress.

ISC Series Engines

The ISC series engines, including the ISC CM2150, ISC CM554, ISC CM850, and ISC8.3 CM2250, also incorporate the 3903118 screw. These engines are typically found in agricultural and construction equipment, where durability and reliability are paramount. The screw’s flange head provides a large surface area for torque application, ensuring that the fasteners remain tight and secure during operation.

ISL Series Engines

The ISL series engines, such as the ISL CM2150 and ISL CM554, are another group that uses the 3903118 screw. These engines are often used in on-highway and vocational applications, requiring components that can withstand significant mechanical stress. The screw’s design facilitates easy installation and removal, which is essential for efficient maintenance and repair.

ISF Series Engines

The ISF series engine, specifically the ISF2.8 CM2220 F129, also employs the 3903118 screw. This engine is typically used in medium-duty applications, where the screw’s reliability and strength are critical for maintaining engine performance and longevity.

B Series Engines

The B series engines, including the B3.3, B5.9, B5.9 G, B5.9 GAS PLUS CM556, and B6.7S, are another set of engines that utilize the 3903118 screw. These engines are often found in smaller commercial vehicles and industrial equipment, where the screw’s precision and durability are essential for reliable operation.

C Series Engines

The C series engines, such as the C GAS PLUS CM556 and C8.3 G, also incorporate the 3903118 screw. These engines are typically used in a variety of applications, from construction equipment to marine vessels, where the screw’s performance is critical for maintaining engine reliability.

ISB/ISD Series Engines

The ISB/ISD series engines, including the ISB/ISD4.5 CM2150 B119 and ISB/ISD6.7 CM2150 SN, also use the 3903118 screw. These engines are known for their versatility and are used in a wide range of applications, from heavy-duty trucks to industrial machinery. The screw’s design ensures that it can withstand the rigors of these demanding environments.

ISBE4 Series Engines

The ISBE4 series engine, specifically the ISBE4 CM850, also utilizes the 3903118 screw. This engine is typically used in medium-duty applications, where the screw’s reliability and strength are essential for maintaining engine performance and longevity.

The 3903118 Hexagon Flange Head Cap Screw is a critical component for many Cummins engines, providing the necessary strength and reliability for a variety of applications. Its design ensures that it can withstand the demanding conditions of engine operation, making it an essential part of the engine assembly and maintenance process.

Role of Part 3903118 Hexagon Flange Head Cap Screw in Engine Systems

The Hexagon Flange Head Cap Screw, identified by part number 3903118, is integral to the assembly and functionality of various engine systems. Its robust design ensures secure fastening in high-stress applications, making it suitable for a wide range of components.

Accessories

In the realm of engine accessories, this screw is often utilized to mount components such as alternators and fan drives. Its flange head provides additional surface area, enhancing the stability and reliability of these attachments.

Air Intake and Compressor Systems

For air intake systems, the screw secures connections and housings, ensuring airtight seals that are vital for optimal engine performance. In compressor systems, whether dealing with air or refrigerant, it fastens critical components, maintaining the integrity of the system under varying pressures.

Brake and Cooling Systems

In brake systems, the screw is employed to mount brake components, ensuring they remain firmly in place during operation. For cooling systems, it secures connections at the water inlet and outlet, as well as within engine oil and marine gear oil coolers, facilitating efficient heat exchange.

Fuel and Injection Systems

Within fuel control modules and injector plumbing, the screw plays a role in securing injectors and fuel lines. This ensures precise fuel delivery and maintains the integrity of the fuel system under high pressure.

Engine and Performance Components

The screw is also pivotal in engine installation kits, where it mounts the engine housing, thermostat, and other critical components. Its use in performance parts ensures that enhancements such as aftermarket air shutdown devices and exhaust recirculation systems are securely fastened.

Drive and Mounting Applications

For drive components like water pumps and fan drives, the screw provides the necessary fastening strength. Additionally, it is used in mounting applications for alternators and other rotating components, ensuring they operate smoothly and efficiently.

Conclusion

In summary, the 3903118 Hexagon Flange Head Cap Screw is a versatile fastener that enhances the reliability and performance of various engine systems through secure and stable component mounting. Its robust design and high-strength material composition make it suitable for demanding environments, ensuring the structural integrity and operational reliability of commercial trucks and engines.