4990909
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw, identified by Part #4990909, is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This component is integral to the assembly and maintenance of commercial trucks, ensuring secure and reliable connections in various mechanical systems.

Basic Concepts of Twelve Point Cap Screws

A Twelve Point Cap Screw is a type of fastener characterized by its hexagonal socket head, which provides a larger contact area compared to traditional hex-head screws. This design allows for more torque to be applied without rounding off the head, making it suitable for high-stress applications ¹. Unlike other cap screws, the twelve-point design reduces the likelihood of cam-out, where the tool slips out of the fastener head during tightening. These screws are commonly used in mechanical assemblies where high torque and secure fastening are required.

Purpose and Role in Truck Operation

This part plays a significant role in the operation of commercial trucks by securing critical components and assemblies. It is designed to withstand high levels of stress and vibration, ensuring that parts remain firmly attached under demanding conditions. This contributes to the overall functionality and reliability of the vehicle, as loose or improperly secured components can lead to mechanical failures and safety hazards.

Key Features

This Cummins part is engineered with several key features that enhance its performance and durability. Its twelve-point design allows for greater torque application without the risk of rounding the head. The screw is typically made from high-strength materials, such as alloy steel, which provides excellent resistance to wear and corrosion. Additionally, the screw may feature a zinc-plated or other protective coating to further enhance its longevity in harsh environments.

Benefits

The advantages of using the 4990909 Twelve Point Cap Screw include improved torque application, resistance to loosening, and enhanced load distribution. The twelve-point design allows for more efficient torque transfer, reducing the likelihood of stripping or cam-out. This results in a more secure fastening solution, which is particularly important in applications where vibrations and dynamic loads are present. The material composition and protective coatings also contribute to the screw’s durability, ensuring long-term performance in demanding conditions.

Installation and Usage

Proper installation of this part is crucial for optimal performance and longevity. It is recommended to use the appropriate torque specifications provided by the manufacturer to ensure that the screw is tightened to the correct level without over-torquing. Using the correct socket tool is also important to avoid damage to the screw head. Additionally, it is advisable to periodically inspect the fastener for signs of wear or loosening, especially in high-vibration environments.

Troubleshooting and Maintenance

Common issues with Twelve Point Cap Screws may include loosening due to vibration, corrosion, or wear. To address these issues, regular inspections should be conducted to ensure that all fasteners are secure. If corrosion is detected, the affected area should be cleaned, and a protective coating reapplied if necessary. In cases where wear is evident, the screw should be replaced to maintain the integrity of the assembly. Proper maintenance practices, such as using the correct torque settings and protective coatings, can help prolong the lifespan of the component.

Cummins: Manufacturer Overview

Cummins Inc. is a globally recognized leader in the design, manufacture, and distribution of diesel and natural gas engines, as well as related technologies. With a history spanning over a century, Cummins has established a strong reputation for producing high-quality, reliable components for the commercial truck industry. The company’s extensive product range includes engines, filtration systems, powertrain components, and aftermarket parts, all designed to meet the rigorous demands of commercial transportation. Cummins’ commitment to innovation, quality, and customer satisfaction makes it a trusted source for truck components, including the 4990909 Twelve Point Cap Screw.

Cummins Twelve Point Cap Screw in Engine Applications

The Twelve Point Cap Screw, part number 4990909, manufactured by Cummins, is a critical component in various engine assemblies. This screw is designed to provide robust fastening capabilities, ensuring secure connections in high-stress environments typical of engine operations.

B3.3 Engine Group

In the B3.3 engine series, the Twelve Point Cap Screw 4990909 is utilized in several key areas. Its primary function is to secure various engine components, ensuring they remain tightly fastened under operational conditions. This screw is often found in applications where it must withstand significant mechanical stress and thermal variations, maintaining the integrity of the engine’s structure.

The precision engineering of the Twelve Point Cap Screw ensures it can handle the dynamic forces encountered in engine environments, contributing to the overall reliability and performance of the B3.3 engines. Its use in critical assemblies highlights its importance in maintaining the engine’s operational efficiency and longevity.

Role of Part 4990909 Twelve Point Cap Screw in Engine Systems

In the intricate world of engine systems, the part 4990909 Twelve Point Cap Screw serves as a fundamental component, ensuring the secure assembly and reliable operation of various engine parts. Its application spans across multiple components, contributing to the overall performance and durability of the engine.

Connecting Rod and Piston Assembly

The connecting rod and piston assembly is a dynamic part of the engine, converting the linear motion of the piston into rotational motion of the crankshaft. The Twelve Point Cap Screw, part 4990909, is often utilized in this assembly to secure the connecting rod to the crankshaft. This secure fastening is essential for maintaining the precise alignment and balance necessary for smooth engine operation. The screw’s design allows for efficient torque application, reducing the risk of loosening under the high stresses and vibrations encountered during engine operation.

Injector Plumbing

In fuel injection systems, precise fuel delivery is paramount for engine performance and efficiency. The Twelve Point Cap Screw plays a role in securing components within the injector plumbing, such as fuel rail mounting brackets and injector hold-down clamps. Its use ensures that the fuel injectors are held firmly in place, preventing leaks and ensuring consistent fuel delivery under varying engine loads and speeds. The screw’s twelve-point design offers enhanced grip, reducing the likelihood of cam-out during tightening or removal, which is particularly beneficial in the confined spaces often found in engine compartments.

General Parts and Performance Enhancements

Beyond specific applications, part 4990909 is widely used throughout engine systems for general fastening purposes. Whether securing performance parts like cold air intakes, exhaust manifolds, or turbocharger components, the Twelve Point Cap Screw provides a reliable solution. Its application in performance parts is particularly noteworthy, as these components are often subjected to extreme conditions. The screw’s robust design and resistance to loosening under vibration contribute to the longevity and performance of these parts, allowing engines to operate at their peak efficiency.

Conclusion

In summary, the part 4990909 Twelve Point Cap Screw is a versatile and essential component in engine systems, facilitating secure assembly and reliable operation across a wide range of applications. Its role in connecting rod and piston assemblies, injector plumbing, and various performance parts underscores its importance in maintaining engine performance and durability.