202159
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw Part #202159 by Cummins is a specialized fastener designed for use in commercial truck operations. This part is integral to the assembly and maintenance of various truck components, ensuring secure and reliable connections. Its design and construction are tailored to meet the demanding requirements of heavy-duty applications.

Basic Concepts of Twelve Point Cap Screws

A twelve point cap screw is a type of fastener characterized by its hexagonal socket head, which allows for torque application using a socket wrench. This design provides a larger contact area compared to traditional hex-head screws, reducing the risk of cam-out and enabling higher torque application. Unlike other fasteners, twelve point cap screws offer enhanced resistance to loosening due to their unique geometry. The design typically includes a fully threaded shank, which allows for secure fastening into pre-tapped holes ¹.

Role of the 202159 Twelve Point Cap Screw in Truck Operations

This Cummins part plays a significant role in the assembly and maintenance of commercial truck components. It is commonly used in applications where high torque and secure fastening are required, such as in engine mounts, transmission housings, and chassis components. By providing a robust and reliable connection, this screw contributes to the overall durability and performance of the truck ².

Key Features

The 202159 Twelve Point Cap Screw is constructed from high-strength alloy steel, ensuring durability and resistance to wear. It features a fine thread type, which allows for precise adjustments and secure fastening. The screw’s twelve-point design enhances torque application efficiency and reduces the likelihood of stripping or cam-out during installation. Additionally, the screw is coated with a corrosion-resistant finish to maintain performance in various environmental conditions ³.

Benefits

Using the 202159 Twelve Point Cap Screw offers several advantages in heavy-duty applications. Its design allows for improved torque application, ensuring that components are securely fastened. The resistance to loosening provided by the twelve-point geometry enhances the reliability of the connections. Furthermore, the high-strength material and corrosion-resistant coating contribute to the screw’s durability, making it suitable for long-term use in demanding environments.

Troubleshooting and Maintenance

Common issues with twelve point cap screws may include corrosion, stripping, or loosening over time. To address these issues, regular inspection and maintenance are recommended. Ensuring that screws are properly torqued during installation can prevent loosening. In cases of corrosion, cleaning the affected area and reapplying a corrosion-resistant coating can restore performance. If a screw becomes stripped, it may need to be replaced to maintain secure fastening.

About Cummins

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 name in the commercial truck industry. The company is committed to innovation and quality, continually developing advanced solutions to meet the evolving needs of its customers. Cummins’ dedication to excellence is reflected in its comprehensive range of truck components, including the 202159 Twelve Point Cap Screw.

Compatibility with Cummins Engines

This part is designed to fit a variety of Cummins engines, providing robust fastening solutions across different engine models. Below are the engine series and models compatible with the Twelve Point Cap Screw 202159:

ISM Series Engines

• ISM CM570
• ISM CM570/870
• ISM CM876
• ISM11 CM876 SN

K Series Engines

• K19
• K38
• K50

KTA19 Series Engines

• KTA19GC

L10 Series Engines

• L10 CELECT
• L10 GAS
• L10 MECHANICAL

M11 Series Engines

• M11 CELECT
• M11 CELECT PLUS
• M11 MECHANICAL

N14 Series Engines

• N14 CELECT
• N14 G
• N14 MECHANICAL

NH/NT Series Engines

• NH/NT 855

QSK Series Engines

• QSK19 CM2350 K105
• QSK19 CM2350 K114
• QSK19 CM500
• QSK19 CM850 MCRS
• QSK38 CM2150 MCRS
• QSK38 CM850 MCRS

Role of Part 202159 Twelve Point Cap Screw in Engine Systems

This part is integral to the secure assembly and operation of various engine components. It is utilized in the attachment of the starting motor to its mounting, ensuring a stable and reliable connection that is essential for the motor’s function during engine start-up.

In the context of base rail mounting, this cap screw plays a significant role in securing the base rails to the engine frame. This is vital for maintaining the structural integrity and alignment of the engine components during operation.

For the drive and engine barring mechanisms, the Twelve Point Cap Screw is employed to fasten the drive components, ensuring they remain in place and function correctly during the barring process, which is important for engine maintenance and turnover.

The fan drive arrangement and fan hub mounting also benefit from the use of this cap screw. It secures the fan mounting hub to the fan support and flywheel housing, ensuring efficient airflow management within the engine system.

In the assembly of the flywheel housing and its variants (such as Flywheel Housing No 1 and Flywheel Mounting Housing), the Twelve Point Cap Screw is used to attach these components securely to the engine, contributing to the smooth operation of the flywheel and, by extension, the engine’s rotational dynamics.

The lever and rocker mechanisms within the engine system are also fastened using this cap screw, ensuring these components can operate with precision and reliability.

For the magnetic mounting switch and other mounting applications, such as the starting motor and starter motor mounting, the Twelve Point Cap Screw provides the necessary tension and security to ensure these components can perform their intended functions without failure.

In dual barring mechanisms and dual starters, the cap screw is essential for maintaining the correct alignment and operation of these complex systems, which are critical for engine start-up and maintenance procedures.

Lastly, in the electric system kit, the Twelve Point Cap Screw is used in various mounting applications to ensure the electrical components are securely fastened, contributing to the overall reliability and safety of the engine’s electrical system.

Conclusion

The 202159 Twelve Point Cap Screw by Cummins is a critical component in the assembly and maintenance of commercial truck and engine systems. Its design, featuring a twelve-point geometry and high-strength material, ensures secure and reliable fastening in demanding applications. Regular maintenance and proper installation practices are essential to maximize the performance and longevity of this part.