4381251
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw, specifically Part #4381251 by Cummins, is a specialized fastener designed for use in commercial trucks. Cummins, a renowned manufacturer of diesel engines and related components, produces this screw to meet the demanding requirements of heavy-duty applications. This screw is integral to ensuring the reliability and performance of various truck components.

Basic Concepts

Hexagon Flange Head Cap Screws are characterized by their hexagonal head and flange feature. 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 the material. In the automotive industry, these screws are commonly used for fastening components that require high strength and resistance to vibration, such as engine mounts, chassis parts, and body panels ¹.

Purpose and Role in Truck Operation

This Cummins part plays a significant role in the operation of commercial trucks by securing critical components and systems. It is often used in applications where both high tensile strength and resistance to loosening are required. These applications include fastening engine components, transmission parts, and various chassis elements. The screw ensures that these components remain securely in place, even under the rigors of heavy-duty use ².

Key Features

The 4381251 Hexagon Flange Head Cap Screw features a hexagonal head that facilitates easy and precise torque application. The flange at the base of the head provides additional bearing surface, which helps in distributing the load and preventing the screw from pulling through the material. The screw is typically made from high-strength materials such as alloy steel, which offers excellent durability and resistance to corrosion. The threading specifications are designed to ensure a secure fit and optimal performance in demanding environments ³.

Benefits

This part offers several benefits that make it suitable for heavy-duty truck applications. Its design provides enhanced fastening strength, ensuring that components remain securely attached under various operating conditions. The flange feature helps in resisting loosening due to vibration, which is common in truck operations. Additionally, the material composition and threading specifications contribute to the screw’s durability, making it resistant to wear and corrosion in demanding truck environments ⁴.

Installation Guidelines

Proper installation of the 4381251 Hexagon Flange Head Cap Screw is crucial for ensuring secure and reliable fastening. The following guidelines should be followed:

1. Clean the Surface: Ensure that the surface where the screw will be installed is clean and free of debris.
2. Use the Correct Tool: Employ a hexagonal socket or wrench that matches the size of the screw head to apply torque.
3. Apply Torque Specifications: Follow the manufacturer’s torque specifications to avoid over-tightening or under-tightening.
4. Check Alignment: Ensure that the screw is aligned properly with the hole to prevent cross-threading.
5. Inspect the Installation: After installation, inspect the screw to ensure it is securely fastened and the flange is in proper contact with the surface.

Troubleshooting and Maintenance

Common issues with the 4381251 Hexagon Flange Head Cap Screw may include loosening, corrosion, or damage. To address these issues:

• Loosening: Re-tighten the screw to the specified torque. If frequent loosening occurs, inspect for vibrations or movement in the fastened components.
• Corrosion: Clean the screw and surrounding area. Applying a corrosion-resistant coating can help prevent future issues.
• Damage: Inspect the screw for signs of wear or damage. Replace the screw if necessary to maintain secure fastening.

Regular maintenance, such as periodic inspection and re-torqueing, can help prolong the service life of the screw and ensure continued reliable performance.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes diesel and natural gas engines, as well as related technologies. Founded in 1919, Cummins has built a reputation for innovation, quality, and reliability. The company’s product portfolio includes engines, filtration systems, powertrain-related components, and emission solutions. Cummins is recognized for its commitment to customer satisfaction and its role in powering a more prosperous world.

Application in Cummins Engines

QSK45 CM500 and QSK60 CM500

In the QSK45 CM500 and QSK60 CM500 engines, the Hexagon Flange Head Cap Screw is utilized in various applications where a robust and reliable fastening solution is required. This includes securing engine components, ensuring that the engine’s internal parts remain tightly bound during operation. The screw’s design allows for easy installation and removal, which is crucial during routine maintenance and repairs.

QSK60 CM850 MCRS

For the QSK60 CM850 MCRS engine, the Hexagon Flange Head Cap Screw plays a pivotal role in maintaining the engine’s structural integrity. Given the higher power output and more complex design of the QSK60 CM850 MCRS, the screw’s ability to withstand higher stresses and torques is essential. It is used in critical areas where the engine’s performance and longevity depend on the precision and durability of the fastening.

Importance of the Hexagon Flange Head Cap Screw

The Hexagon Flange Head Cap Screw is designed to provide a secure and stable connection between engine components. Its flange head allows for a larger bearing surface, distributing the load more evenly and reducing the risk of stripping or damage to the screw. This design is particularly important in high-stress environments, such as those found in heavy-duty engines.

Installation and Maintenance

Proper installation of the Hexagon Flange Head Cap Screw is crucial to ensure the engine operates efficiently and reliably. Technicians must follow the manufacturer’s guidelines for torque specifications and tightening sequences to avoid over-tightening, which can damage the screw or the engine components it secures. Regular maintenance checks should include inspecting the screws for signs of wear, corrosion, or loosening, ensuring they remain in optimal condition throughout the engine’s lifecycle.

Role of Part 4381251 Hexagon Flange Head Cap Screw in Engine Systems

In the intricate assembly of engine systems, the 4381251 Hexagon Flange Head Cap Screw serves a significant role in ensuring the secure attachment and stability of various components.

Exhaust Manifold

The exhaust manifold is a vital component in the engine system, responsible for collecting exhaust gases from the engine’s cylinders and directing them into the exhaust pipe. The Hexagon Flange Head Cap Screw is utilized to fasten the manifold to the engine block. This secure attachment is essential for maintaining the integrity of the exhaust system, ensuring that exhaust gases are efficiently channeled away from the engine. The flange head design of the screw provides additional surface area for a tighter and more reliable fit, reducing the risk of leaks and enhancing overall performance.

Hexagon Head Cap Screw

The Hexagon Head Cap Screw, often used interchangeably with the Hexagon Flange Head Cap Screw in certain applications, plays a role in fastening various engine components together. Whether securing engine covers, attaching brackets, or fastening other critical parts, these screws are designed to withstand high levels of stress and vibration. Their hexagonal head allows for easy tightening and loosening using a wrench or socket, ensuring that components remain firmly in place under the demanding conditions of engine operation.

Conclusion

The 4381251 Hexagon Flange Head Cap Screw is integral to the secure and efficient operation of engine systems. Its application in components like the exhaust manifold and its use as a general fastening solution underscores its importance in maintaining the structural integrity and performance of the engine.