158250
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw, Part #158250, is a specialized fastener produced by Cummins. This article provides an overview of its design, function, and application within commercial trucks.

Basic Concepts of Twelve Point Cap Screws

A Twelve Point Cap Screw is a type of bolt characterized by its twelve-sided head, which offers enhanced grip and reduced likelihood of cam-out during tightening compared to traditional hex cap screws ¹. This design allows for more efficient torque application and improved stability in high-stress applications.

Role and Function in Truck Operation

This Cummins part plays a role in securing various components within a truck’s engine and chassis. Its design ensures a secure fit, contributing to the overall structural integrity and performance of the vehicle ².

Key Features

• Twelve-sided head for improved grip and reduced cam-out
• High-strength material construction for durability
• Designed for use in high-stress applications
• Compatible with a variety of truck components

Benefits

• Enhanced torque application efficiency
• Improved stability and reduced risk of loosening
• Durable construction for long-term use
• Versatile application across different truck components

Troubleshooting and Maintenance

Regular inspection of Twelve Point Cap Screws is recommended to ensure they remain secure and free of damage. Signs of wear or loosening should be addressed promptly to maintain the integrity of the fastened components. Proper torque specifications should be followed during installation to prevent over-tightening or under-tightening ³.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a commitment to innovation and quality, Cummins serves customers in approximately 190 countries and territories through a network of distributors, dealers, and independent service providers.

Twelve Point Cap Screw 158250 in Cummins Engines

The Twelve Point Cap Screw 158250, manufactured by Cummins, is a critical component used across a variety of Cummins engine models. This screw is integral to the assembly and maintenance of these engines, ensuring secure fastening in various applications.

ISX Series Engines

The ISX series engines, including the ISX CM570, ISX CM870, ISX CM871, ISX15 CM2250, ISX15 CM2250 SN, and ISX15 CM2350 X101, utilize the Twelve Point Cap Screw 158250 in several key areas. These engines, known for their robust performance and reliability, require precise fastening to maintain structural integrity and operational efficiency. The screw is often used in the assembly of engine blocks, cylinder heads, and other critical components, ensuring that parts remain securely fastened under high stress conditions.

K Series Engines

In the K series engines, such as the K19, K38, and K50, the Twelve Point Cap Screw 158250 plays a similar role. These engines are designed for heavy-duty applications, and the screw’s strength and durability are essential for maintaining the structural integrity of the engine components. The screw is frequently used in the mounting and securing of various parts, including engine mounts and other critical assemblies.

KTA38 Series Engines

The KTA38GC CM558 engine also incorporates the Twelve Point Cap Screw 158250. This engine, designed for industrial applications, relies on the screw for secure fastening of components that are subjected to significant mechanical stress. The screw’s design ensures that parts remain tightly secured, contributing to the engine’s overall reliability and performance.

L10 Series Engines

The L10 series engines, including the L10 CELECT, L10 GAS, and L10 MECHANICAL, use the Twelve Point Cap Screw 158250 in various applications. These engines, known for their versatility and efficiency, require precise fastening to ensure optimal performance. The screw is used in the assembly of engine blocks, cylinder heads, and other critical components, ensuring that parts remain securely fastened under operational conditions.

QSK Series Engines

The QSK series engines, such as the QSK19 CM500, QSK38 CM2150 MCRS, QSK38 CM850 MCRS, QSK45 CM500, QSK50 CM2150 K107, QSK50 CM2150 MCRS, QSK50 CM2350 K108, QSK60 CM500, QSK60 CM850 MCRS, and QSK78 CM500, also utilize the Twelve Point Cap Screw 158250. These engines, designed for a range of applications from marine to industrial, require the screw for secure fastening of various components. The screw is used in the assembly of engine blocks, cylinder heads, and other critical parts, ensuring that the engine maintains its structural integrity and operational efficiency.

QSX15 Series Engines

The QSX15 CM2250 engine incorporates the Twelve Point Cap Screw 158250 in several key areas. This engine, designed for heavy-duty applications, relies on the screw for secure fastening of components that are subjected to significant mechanical stress. The screw’s design ensures that parts remain tightly secured, contributing to the engine’s overall reliability and performance.

Part 158250 Twelve Point Cap Screw Component Usage

This part is integral to the assembly and securement of various components within engine systems. Its application ensures the stability and proper functioning of the engine’s mechanical parts.

In the air starter system, this cap screw is used to fasten the starter motor securely to the engine block, ensuring efficient operation and minimizing vibrations during start-up.

For the bracket buttress, it plays a role in securing the bracket to the engine frame, providing a stable platform for other components to be mounted.

On the bulk parts list, it is often listed as a necessary fastener for various engine components, highlighting its versatility and widespread use.

In the clutch assembly, the Twelve Point Cap Screw is employed to secure the clutch housing to the flywheel, ensuring that the clutch operates smoothly and transfers power efficiently from the engine to the transmission.

For the clutch, rear, it is used to attach the rear clutch components to the engine, maintaining alignment and reducing wear on the clutch mechanism.

In dual starter systems, this cap screw is essential for mounting both starters to the engine, allowing for redundancy and ensuring the engine can be started under various conditions.

For flexplate mounting, it secures the flexplate to the flywheel, which is critical for the operation of automatic transmissions.

In the housing flywheel, the cap screw is used to attach the housing to the engine block, ensuring the flywheel operates within its designed parameters.

For the oil pan and pan oil systems, it is utilized to fasten the oil pan to the engine block, ensuring a secure seal and preventing oil leaks.

In plumbing, air starter applications, it secures various plumbing components, ensuring the air starter system functions correctly.

For the prelub air starter lb and primer, engine lubricating, it is used to attach lubricating components to the engine, ensuring proper lubrication during start-up.

On the rail, base, it secures the base rail to the engine frame, providing a stable foundation for other engine components.

In the starter and starter bracket mounting, it is crucial for attaching the starter motor and its bracket to the engine, ensuring reliable start-up performance.

For the starter motor and starter motor mounting, it secures the starter motor in place, allowing it to engage with the flywheel effectively.

In starter mounting and starter, mtg, it is used to fasten the starter to the engine, ensuring it remains in the correct position during operation.

For starting mounting motor, it secures the motor in its mounting position, ensuring it functions correctly during engine start-up.

In the stubshaft and subbase, it is used to attach these components to the engine, ensuring they operate within their designed parameters.

For support, front engine, it secures the front engine support structure, providing stability to the engine assembly.

In the vt903 short block kit, it is utilized to fasten various components within the short block, ensuring they are securely attached and function as intended.

Conclusion

The Twelve Point Cap Screw, Part #158250, is a vital component in the assembly and maintenance of Cummins engines. Its unique design and robust construction ensure secure fastening of critical engine components, contributing to the overall performance and reliability of the engine. Regular maintenance and proper installation are essential to maximize the benefits of this part.