4903481
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 4903481, is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This screw is integral to the assembly and maintenance of various components within commercial trucks, ensuring secure and reliable fastening solutions.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by its hexagonal head and flanged base. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area to distribute load and prevent the screw from sinking into softer materials. This design is particularly effective in fastening applications where high strength and stability are required ¹.

Purpose and Role in Truck Operation

This Cummins part plays a significant role in the operation and maintenance of commercial trucks. It is used to secure various components, ensuring they remain firmly in place under operational stresses. This screw is often found in critical areas such as engine mounts, chassis assemblies, and other structural components where reliability and durability are paramount ².

Key Features

The 4903481 Hexagon Flange Head Cap Screw features a hexagonal head that facilitates easy and precise tightening with common tools. The flange at the base of the screw head provides additional bearing surface, enhancing the screw’s ability to withstand loads and resist loosening. Additionally, the screw is crafted from high-quality materials, ensuring it can endure the rigors of commercial truck environments ³.

Benefits

This part offers several advantages. Its design enhances fastening security by providing a larger contact area and better load distribution. The screw’s resistance to vibration helps maintain tight connections in dynamic environments. Furthermore, the hexagonal head allows for straightforward installation and removal, reducing the time and effort required during maintenance procedures.

Installation Procedures

To ensure optimal performance and longevity, the 4903481 Hexagon Flange Head Cap Screw should be installed following these steps:

1. Clean the installation area to remove any debris or contaminants.
2. Align the screw with the designated hole, ensuring proper orientation.
3. Use a torque wrench to tighten the screw to the manufacturer’s specified torque settings.
4. Verify the screw is secure and the flange is flush with the surface.

Common Applications

The 4903481 Hexagon Flange Head Cap Screw is commonly used in various applications within commercial trucks. These include securing engine components, chassis assemblies, and other critical structural parts. Its versatility and reliability make it a preferred choice for many fastening needs in the industry.

Troubleshooting and Maintenance

Regular inspection and maintenance of the 4903481 Hexagon Flange Head Cap Screw can help identify and address common issues such as loosening or corrosion. If loosening is detected, re-tighten the screw to the specified torque. In cases of corrosion, clean the affected area and consider applying a corrosion-resistant coating to prevent further degradation.

Safety Considerations

When working with the 4903481 Hexagon Flange Head Cap Screw, it is important to follow safety guidelines to protect personnel and ensure the integrity of the truck. Use appropriate personal protective equipment (PPE), such as gloves and safety glasses. Ensure all tools are in good condition and rated for the task. Follow proper lifting and handling techniques to avoid injury.

Cummins Overview

Cummins is a renowned manufacturer with a rich history in the commercial truck industry. The company offers a wide range of products, including engines, powertrain components, and aftermarket parts. Cummins is known for its commitment to quality, innovation, and customer satisfaction, making it a trusted name in the industry.

Hexagon Flange Head Cap Screw (Part 4903481) Compatibility with Cummins Engines

The Cummins part number 4903481, a Hexagon Flange Head Cap Screw, is designed to fit a variety of Cummins engines. This screw is integral in securing various components within the engine assembly, ensuring structural integrity and operational efficiency. Below is a detailed breakdown of the engines that this part is compatible with, grouped for clarity.

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250
• ISC9 CM2250/QSL9 CM2250
• QSC8.3 CM554
• QSC8.3 CM850 (CM2850)
• QSC9 CM2250/QSL9 CM2250
• QSL8.9 CM2150 L141
• QSL9 CM2250
• QSL9 CM2350 L102
• QSL9 CM554
• QSL9 CM850 (CM2850)

ISL Series Engines

• ISL CM2150
• ISL CM554
• ISL9 CM2150 SN
• ISL9 CM2250
• ISL9.5 CM2880 L138

ISX Series Engines

• ISX12 CM2350 X102
• ISX12/ISX11.9 CM2250
• ISX15 CM2250

ISV (Nissan)

• ISV (Nissan)

ISZ Series Engines

• ISZ13 CM2150 Z105

QSK Series Engines

• QSK60 G CM2358 K110

This part is engineered to meet the rigorous demands of Cummins engines, providing reliable fastening in critical applications. Whether securing engine covers, brackets, or other structural components, the Hexagon Flange Head Cap Screw ensures that the engine operates smoothly and efficiently.

Role of Part 4903481 Hexagon Flange Head Cap Screw in Engine Systems

The part 4903481 Hexagon Flange Head Cap Screw is integral to the assembly and functionality of various engine components. Its design allows for secure fastening, ensuring that components remain firmly in place under the high stresses and vibrations typical in engine operation.

Aftertreatment Device

In aftertreatment devices, the Hexagon Flange Head Cap Screw is used to secure components such as catalytic converters and diesel particulate filters. This ensures that these components remain stable and do not shift during operation, which is essential for maintaining efficient emissions control.

Cam Housing Module

Within the cam housing module, this screw plays a role in fastening the module to the engine block. This secure attachment is vital for maintaining the precise alignment of the camshaft, which is necessary for the proper timing of valve operations.

Connecting Rod and Piston

The screw is employed in the assembly of connecting rods to pistons. This connection must be robust to withstand the reciprocating forces generated during engine operation, ensuring smooth and reliable piston movement.

Control Linkage Lever

For control linkage levers, the Hexagon Flange Head Cap Screw provides a strong and durable connection point. This is important for the accurate and consistent operation of various engine controls, such as those for the throttle or fuel injection systems.

Fuel Injection Pump

In fuel injection pumps, this screw is used to secure components within the pump housing. This ensures that all parts remain in their correct positions, which is essential for the precise delivery of fuel to the engine cylinders.

Fuel Pump and Fuel Pump Assembly

The screw is crucial in the assembly of fuel pumps and their mounting to the engine. It ensures that the pump remains securely in place, which is necessary for consistent fuel pressure and flow.

Fuel Pump Body and Fuel Pump Mounting

Within the fuel pump body and its mounting, the screw provides a reliable fastening solution. This is important for maintaining the structural integrity of the fuel pump and ensuring it operates within specified parameters.

Injector Plumbing

In injector plumbing systems, the screw is used to secure fittings and connections. This ensures that the fuel lines remain intact and do not leak, which is essential for maintaining fuel system integrity and performance.

Performance Parts

For performance parts, such as upgraded turbochargers or intercoolers, the screw offers a strong and secure fastening method. This is important for withstanding the increased stresses and temperatures associated with performance enhancements.

Turbocharger and Turbocharger Plumbing

In turbochargers and their plumbing, the screw is used to secure various components, such as the turbine housing or compressor cover. This ensures that all parts remain firmly in place, which is vital for the turbocharger’s efficiency and durability.

XPI JV Components

Within XPI JV components, including those for Cummins HD, Cummins MR, Scania HD, and Texas systems, the screw is used to secure critical components. This ensures that the high-pressure fuel systems operate reliably under extreme conditions.

Conclusion

By providing a secure and durable fastening solution, the part 4903481 Hexagon Flange Head Cap Screw plays a significant role in the reliable operation and performance of these engine systems. Its design and features make it a critical component in the assembly and maintenance of commercial truck engines, ensuring that all components remain firmly in place under operational stresses.