3918567
Twelve Point Cap Screw
Cummins®

The 3918567 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 producing high-quality components that enhance the performance and reliability of vehicles. This particular cap screw is integral to various truck systems, ensuring secure and durable fastening solutions.

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 six-point screws. This design allows for better torque application and reduces the risk of cam-out, where the tool slips out of the screw head during tightening. The twelve-point configuration also offers enhanced resistance to stripping, making it suitable for high-torque applications ¹.

Purpose of the 3918567 Twelve Point Cap Screw

The 3918567 Twelve Point Cap Screw plays a significant role in the operation of commercial trucks. It is used in various applications where secure and reliable fastening is required. This includes attaching critical components such as engine mounts, transmission housings, and chassis parts. The screw ensures that these components remain firmly in place, contributing to the overall stability and performance of the truck ².

Key Features

The 3918567 Twelve Point Cap Screw features a robust design that includes a hexagonal socket head for improved torque application. It is made from high-strength materials, typically alloy steel, which provides excellent durability and resistance to wear. The screw’s surface may be treated with a corrosion-resistant coating to enhance its longevity in harsh environments. Additionally, the precise threading ensures a secure fit and reduces the likelihood of loosening over time ³.

Benefits

The advantages of using the 3918567 Twelve Point Cap Screw include improved torque application due to its twelve-point design, which allows for higher torque without the risk of cam-out. Its resistance to stripping ensures that it can withstand the rigors of heavy-duty applications. The durable material composition and corrosion-resistant coating contribute to its longevity, making it a reliable choice for commercial truck fastening needs ⁴.

Installation and Usage

Proper installation of the 3918567 Twelve Point Cap Screw is crucial for ensuring a secure fit. It is recommended to use a torque wrench to apply the appropriate torque settings, which are typically specified by the manufacturer. This ensures that the screw is tightened to the correct level without over-tightening, which could damage the screw or the components being fastened. Following best practices for installation, such as cleaning the mating surfaces and using the correct tools, will help achieve a secure and lasting connection ⁵.

Troubleshooting and Maintenance

Common issues with the 3918567 Twelve Point Cap Screw may include loosening due to vibration or corrosion. Regular inspection and maintenance can help identify these issues early. If loosening is detected, re-tightening the screw to the specified torque settings is recommended. In cases of corrosion, cleaning the affected areas and applying a corrosion-resistant coating can help prolong the service life of the screw. Proper maintenance practices, such as routine checks and timely replacements, will ensure the continued reliability of the fastening solution ⁶.

Cummins Overview

Cummins is a renowned manufacturer with a long-standing reputation in the automotive industry. The company is known for its commitment to producing high-quality components that enhance the performance and reliability of vehicles. With a history of innovation and excellence, Cummins continues to be a trusted name in the production of automotive parts, including fasteners like the 3918567 Twelve Point Cap Screw ⁷.

Compatibility with Cummins Engines

The 3918567 Twelve Point Cap Screw is a versatile component designed to fit a variety of Cummins engines. This screw is engineered to provide robust fastening solutions, ensuring secure connections in various engine assemblies. Below is a detailed overview of its compatibility with specific Cummins engine models:

6C8.3 Series

• 6C8.3: This engine model benefits from the 3918567 cap screw in its assembly, ensuring critical components are tightly secured.

C GAS PLUS Series

• C GAS PLUS CM556: The 3918567 screw is integral in the assembly of this model, providing reliable fastening for its components.

C8.3 Series

• C8.3 G: This engine utilizes the 3918567 cap screw to maintain structural integrity and secure various parts.

G8.3 Series

• G8.3: The 3918567 screw is a key component in the assembly of the G8.3 engine, ensuring all parts are firmly attached.

ISC Series

• ISC CM2150: The 3918567 screw is used in the assembly of the ISC CM2150 engine, providing essential fastening for its components.
• ISC CM554: This engine model also incorporates the 3918567 cap screw to ensure secure connections.
• ISC CM850: The 3918567 screw is used in the assembly of the ISC CM850 engine, ensuring all parts are tightly fastened.

ISL Series

• ISL CM554: The 3918567 screw is used in the assembly of the ISL CM554 engine, providing reliable fastening for its components.
• ISL9 CM2150 SN: This engine model utilizes the 3918567 cap screw to ensure secure connections.

QSC8.3 Series

• QSC8.3 CM554: The 3918567 screw is used in the assembly of the QSC8.3 CM554 engine, ensuring all parts are firmly attached.
• QSC8.3 CM850 (CM2850): This engine model incorporates the 3918567 cap screw to provide reliable fastening for its components.

QSL8.9 Series

• QSL8.9 CM2150 L141: The 3918567 screw is used in the assembly of the QSL8.9 CM2150 L141 engine, ensuring secure connections.

QSL9 Series

• QSL9 CM2350 L102: The 3918567 screw is used in the assembly of the QSL9 CM2350 L102 engine, providing reliable fastening for its components.
• QSL9 CM554: This engine model utilizes the 3918567 cap screw to ensure secure connections.
• QSL9 CM850 (CM2850): The 3918567 screw is used in the assembly of the QSL9 CM850 (CM2850) engine, ensuring all parts are firmly attached.

The 3918567 Twelve Point Cap Screw is a critical component in the assembly of these Cummins engines, ensuring that all parts are securely fastened and the engines operate efficiently.

Role of 3918567 Twelve Point Cap Screw in Engine Systems

In the intricate assembly of engine systems, the 3918567 Twelve Point Cap Screw serves as a vital fastening component. Its primary function is to securely attach various components, ensuring the structural integrity and operational efficiency of the engine.

Attachment of Components

The Twelve Point Cap Screw is instrumental in the attachment of several key components within the engine system. It is commonly used to fasten the starting motor to its designated mounting points. This secure attachment is essential for the proper alignment and function of the starting motor, which is responsible for initiating the engine’s operation.

Starting Motor Mounting

In the context of starting motor mounting, the Twelve Point Cap Screw plays a significant role. It ensures that the starting motor is firmly mounted to the engine block or other supporting structures. This secure mounting is necessary to withstand the vibrations and stresses generated during engine start-up and operation. The screw’s design allows for a tight and durable connection, minimizing the risk of loosening over time.

General Mounting Applications

Beyond the starting motor, the Twelve Point Cap Screw is also utilized in various other mounting applications within the engine system. It is employed to attach sensors, brackets, and other auxiliary components to the engine block or chassis. This versatility makes it a preferred choice for engineers and mechanics when a reliable and robust fastening solution is required.

Ensuring Structural Integrity

The use of the Twelve Point Cap Screw in these applications contributes to the overall structural integrity of the engine system. By providing a strong and secure connection between components, it helps maintain the precise alignment and positioning necessary for optimal engine performance. This, in turn, enhances the reliability and durability of the engine, ensuring it operates efficiently under a wide range of conditions.

Conclusion

The 3918567 Twelve Point Cap Screw is a critical component in the assembly and maintenance of Cummins engines and commercial truck systems. Its robust design, high-strength material, and corrosion-resistant properties make it an ideal choice for secure and durable fastening solutions. Proper installation, regular maintenance, and timely replacements are essential to ensure the continued reliability and performance of the engine system.