2874787
Twelve Point Cap Screw
Cummins®

The Cummins Part #2874787 Twelve Point Cap Screw is a specialized fastener designed for use in commercial trucks. Its purpose is to provide secure and reliable fastening in various truck components, ensuring the integrity and performance of critical systems. This part is particularly valued for its enhanced design features, which offer improved functionality compared to standard fasteners ¹.

Basic Concepts of Twelve Point Cap Screws

A twelve point cap screw is a type of fastener that features twelve sides instead of the six found on standard hex cap screws. This design allows for a greater contact area between the screw and the driving tool, which can result in more efficient torque application and reduced risk of cam-out ². The operation of a twelve point cap screw is similar to that of a standard hex cap screw, involving the use of a compatible wrench to drive the screw into place.

Purpose and Role in Truck Operation

This Cummins part plays a role in the operation of commercial trucks by providing secure fastening in various components. It is commonly used in applications where high torque and reliable fastening are required, such as in engine mounts, transmission components, and chassis assemblies. The screw’s design helps to ensure that these critical components remain securely fastened under the demanding conditions encountered in commercial truck operation ³.

Key Features

The Twelve Point Cap Screw 2874787 features a twelve-sided head design, which offers several advantages over standard hex cap screws. The screw is typically made from high-strength materials, such as alloy steel, to ensure durability and resistance to wear. Additionally, the screw may feature a corrosion-resistant coating to enhance its performance in harsh environments. Unique characteristics of this screw include its ability to accept higher torque without cam-out and its improved resistance to stripping.

Benefits of Using Twelve Point Cap Screws

Using twelve point cap screws offers several benefits. The increased number of sides allows for more efficient torque application, reducing the likelihood of cam-out during installation. This results in a more secure fastening, which is particularly important in applications where vibrations and dynamic loads are present. Additionally, the design of twelve point cap screws can help to minimize the risk of stripping, ensuring a longer service life for the fastener.

Installation Guidelines

Proper installation of the 2874787 involves several steps. First, ensure that the mating surfaces are clean and free of debris. Use a compatible twelve point socket or wrench to drive the screw into place, applying torque gradually to avoid over-tightening. It is recommended to use a torque wrench to achieve the specified torque value, ensuring consistent and reliable fastening. Follow the manufacturer’s guidelines for torque settings to prevent damage to the screw or the component being fastened.

Troubleshooting Common Issues

Common issues associated with twelve point cap screws include stripping and seizing. Stripping can occur if excessive torque is applied during installation, while seizing may result from corrosion or galling. To troubleshoot stripping, ensure that the correct torque value is being used and that the screw is made from a material suitable for the application. To address seizing, regularly inspect the fastener for signs of corrosion and apply a suitable lubricant if necessary.

Maintenance Tips

Regular maintenance of twelve point cap screws is important to ensure longevity and reliable performance. Inspect the screws periodically for signs of wear, corrosion, or loosening. Re-torque the screws as needed to maintain the specified torque value, especially after periods of heavy use or exposure to harsh conditions. Keeping the mating surfaces clean and free of debris will also help to prevent issues such as seizing and ensure a secure fastening.

Cummins 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 itself as a trusted provider of high-quality components for the commercial truck industry. The company is committed to innovation and excellence, continually developing new technologies and solutions to meet the evolving needs of its customers. Cummins’ dedication to quality and performance is evident in its wide range of products, including the Cummins Part #2874787 Twelve Point Cap Screw.

Twelve Point Cap Screw 2874787 in Cummins Engines

The Twelve Point Cap Screw 2874787, manufactured by Cummins, is a critical component in several of their engine models. This screw is utilized in the ISM CM570 and ISM CM570/870 engines, where it plays a vital role in securing various parts together, ensuring structural integrity and operational efficiency.

In the ISM CM876 and ISM11 CM876 SN engines, the screw is similarly essential, providing the necessary fastening for components that are subject to high stress and vibration. The M11 CELECT and M11 CELECT PLUS engines also incorporate this screw, highlighting its importance in maintaining the precision and reliability of these advanced engine systems.

For the M11 MECHANICAL engine, the Twelve Point Cap Screw 2874787 is used in key areas to ensure that all parts are securely fastened, contributing to the overall performance and durability of the engine.

Lastly, in the QSM11 CM570 engine, this screw is integral to the assembly process, ensuring that all components are properly aligned and secured, which is crucial for the engine’s optimal functioning.

Part 2874787 Twelve Point Cap Screw Component Usage

Mounting Applications

The part 2874787 Twelve Point Cap Screw is instrumental in securing various mounting components within engine systems. Its design allows for a firm and reliable connection, ensuring that the mounting brackets, plates, and other structural elements remain in place under operational stress. This screw is often used to fasten mounting points for sensors, fuel injectors, and other peripheral components that require precise alignment and stability. The twelve-point head provides enhanced grip and reduces the risk of cam-out, which is essential for maintaining the integrity of the mounting system.

Starting Motor Integration

In the context of the starting motor, the part 2874787 Twelve Point Cap Screw plays a significant role in assembling and securing the motor to the engine block. It is used to fasten the starter motor housing, ensuring that it is properly aligned with the flywheel or flexplate. This secure attachment is vital for the efficient transfer of torque from the starter motor to the engine, facilitating smooth and reliable engine starts. Additionally, the screw helps in maintaining electrical connections by ensuring that the starter motor’s terminals are held firmly in place, reducing the risk of loose connections that could lead to starting issues.

Conclusion

The Cummins Part #2874787 Twelve Point Cap Screw is a critical component in the commercial truck industry, offering enhanced functionality and reliability compared to standard fasteners. Its unique design features, such as the twelve-sided head and high-strength materials, make it suitable for demanding applications in engine mounts, transmission components, and chassis assemblies. Proper installation, regular maintenance, and adherence to manufacturer guidelines are essential to ensure the longevity and performance of this part in commercial truck operations.