3903240
Twelve Point Cap Screw
Cummins®

The 3903240 Twelve Point Cap Screw, manufactured by Cummins, is a specialized fastener designed for use in commercial truck applications. Cummins, a well-established name in the automotive industry, is known for its commitment to quality and innovation. This particular cap screw is significant due to its role in ensuring the structural integrity and operational efficiency of commercial trucks.

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 better torque application and reduces the risk of cam-out, where the fastener slips out of the driving tool ¹. In the automotive industry, twelve point cap screws are commonly used in applications requiring high strength and resistance to loosening, such as in engine components, chassis assemblies, and other critical areas.

Purpose and Role in Truck Operation

The 3903240 Twelve Point Cap Screw serves a specific purpose in the context of commercial trucks. It is utilized in areas where high tensile strength and resistance to vibration are required. By securely fastening components, it contributes to the overall functionality and safety of the vehicle. Its application ensures that critical parts remain firmly in place, even under the demanding conditions typical of commercial truck operations.

Key Features

The 3903240 Twelve Point Cap Screw features a robust design that includes a twelve-sided socket head, which enhances torque application and reduces the likelihood of stripping. It is made from high-quality materials, typically alloy steel, which provides excellent durability and resistance to corrosion. The screw’s design also includes a smooth shank and precise threading, ensuring a secure fit and reliable performance over time ².

Benefits

Using the 3903240 Twelve Point Cap Screw offers several benefits. Its design allows for improved torque application, making it easier to achieve the required tightening specifications without damaging the fastener or the surrounding components. The resistance to loosening ensures that fastened parts remain secure, even under vibration and dynamic loads. Additionally, its durability in harsh operating conditions contributes to the longevity and reliability of the truck’s components.

Installation Guidelines

Proper installation of the 3903240 Twelve Point Cap Screw is crucial for optimal performance and safety. Begin by ensuring the mating surfaces are clean and free of debris. Use a torque wrench to apply the specified torque, which should be referenced from the manufacturer’s guidelines. It is important to follow the recommended tightening sequence to avoid distortion of the components being fastened. Additionally, using a lubricant compatible with the fastener material can facilitate installation and reduce the risk of galling ³.

Troubleshooting and Maintenance

Common issues with twelve point cap screws include loosening due to vibration and corrosion. Regular inspection and maintenance can help identify and address these issues promptly. If loosening is detected, re-torque the fastener to the specified value. In cases of corrosion, cleaning the affected area and applying a suitable anti-corrosive treatment can help prolong the life of the fastener. Additionally, ensuring that all fasteners are of the correct grade and size for the application will contribute to continued reliable performance.

Cummins: A Brief Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a history spanning over a century, Cummins has established a strong reputation for quality, reliability, and innovation in the commercial truck industry. The company’s commitment to excellence is evident in its wide range of products, which are designed to meet the demanding requirements of commercial applications. Cummins’ dedication to advancing technology and improving efficiency underscores its position as a trusted manufacturer in the automotive sector ⁴.

Twelve Point Cap Screw 3903240 in Cummins Engines

The 3903240 Twelve Point Cap Screw, manufactured by Cummins, is a critical component in several of their engine models. This screw is designed to provide secure fastening in various engine applications, ensuring the integrity and reliability of the engine’s assembly.

6C8.3

In the 6C8.3 engine, the 3903240 screw is utilized in several key areas to maintain the structural integrity of the engine components. Its twelve-point design allows for efficient torque application, which is crucial for the high-stress environments within the engine.

ISM CM570 and QSM11 CM570

Both the ISM CM570 and QSM11 CM570 engines benefit from the use of the 3903240 screw. These engines, known for their robust performance, require reliable fastening solutions to handle the demanding conditions they operate under. The screw’s design ensures that it can withstand the torque and stress typical in these applications.

ISM CM570/870

The ISM CM570/870 engine incorporates the 3903240 screw in its construction, leveraging its strength and precision to secure various engine parts. This engine model, which combines the features of both the ISM CM570 and ISM 870, relies on the screw to maintain the alignment and stability of its components.

L10 CELECT and L10 MECHANICAL

The L10 CELECT and L10 MECHANICAL engines utilize the 3903240 screw in their design. These engines, known for their versatility and efficiency, require reliable fastening solutions to ensure the longevity and performance of their components. The screw’s twelve-point design provides a secure fit, which is essential for the operational integrity of these engines.

M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL

The M11 CELECT, M11 CELECT PLUS, and M11 MECHANICAL engines all incorporate the 3903240 screw in their assembly. These engines, which are designed for a range of applications, rely on the screw to secure various parts, ensuring that the engine operates smoothly and efficiently. The screw’s design allows for precise torque application, which is critical in maintaining the structural integrity of these engines.

Role of Part 3903240 Twelve Point Cap Screw in Engine Systems

Mounting Applications

The 3903240 Twelve Point Cap Screw is instrumental in securing various components to the engine block or chassis. Its design allows for a firm and reliable connection, which is essential for maintaining the structural integrity of the engine system. In mounting applications, this screw ensures that components such as brackets, sensors, and auxiliary systems are held in place with precision. The twelve-point head provides enhanced grip and reduces the risk of cam-out, making it ideal for high-torque applications where stability is paramount.

Starting Motor Integration

In the context of the starting motor, the 3903240 Twelve Point Cap Screw plays a significant role in attaching the motor to the engine block. This secure attachment is vital for the efficient operation of the starting system. The screw’s robust design ensures that the starting motor remains firmly in position, even under the stress of repeated use. This reliability is essential for consistent engine startups, contributing to the overall performance and durability of the engine system.

Conclusion

The 3903240 Twelve Point Cap Screw is a critical component in the operation and maintenance of commercial trucks and Cummins engines. Its robust design, high-quality materials, and precise engineering ensure reliable performance in demanding applications. Proper installation and maintenance are essential to maximize the benefits of this Cummins part, contributing to the overall efficiency and safety of the vehicle.