153581
Twelve Point Cap Screw
Cummins®

The Cummins Twelve Point Cap Screw, Part #153581, is a specialized fastener designed for use in commercial trucks. This component is integral to the maintenance and operation of trucks, ensuring that various parts and assemblies remain securely fastened under demanding conditions. Its design and functionality are tailored to meet the rigorous requirements of heavy-duty applications, contributing to the overall reliability and performance of commercial vehicles ¹.

Basic Concepts of Twelve Point Cap Screws

A Twelve Point Cap Screw is a type of fastener characterized by its twelve-sided head, which provides a larger contact area compared to traditional six-point screws. This design allows for more torque to be applied without the risk of rounding off the corners, which can occur with six-point screws under high stress. The twelve-point design also facilitates easier and more precise tightening and loosening, reducing the likelihood of damage to the screw head during use ².

Role of the 153581 Twelve Point Cap Screw in Truck Operation

This Cummins part plays a significant role in the operation and maintenance of commercial trucks. It is commonly used in applications where high torque and resistance to loosening are required, such as in engine components, chassis assemblies, and other critical areas. Its precise fit and secure fastening help maintain the integrity of truck structures and systems, ensuring safe and efficient operation ³.

Key Features

The 153581 Twelve Point Cap Screw is crafted from high-quality materials, typically a grade of steel that offers excellent strength and durability. Its thread pitch is designed to provide optimal engagement with mating components, ensuring a secure and stable connection. Unique design elements, such as a corrosion-resistant coating, enhance its performance in various environmental conditions, contributing to its longevity and reliability in truck applications.

Benefits

Using this part in truck applications offers several benefits. Its design allows for improved torque application, making it less prone to stripping under high loads. The twelve-point head provides enhanced security against loosening, which is crucial in dynamic and vibrating environments like those found in commercial trucks. Additionally, its resistance to corrosion ensures that it maintains its integrity over time, reducing the need for frequent replacements.

Troubleshooting and Maintenance

Common issues with the 153581 Twelve Point Cap Screw may include signs of wear, corrosion, or failure due to excessive torque or environmental factors. Regular inspection for these signs is recommended to ensure the screw’s continued reliability. Maintenance practices should include cleaning and applying a protective coating to prevent corrosion, as well as ensuring that torque settings are adhered to during installation to avoid over-tightening.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history of innovation and quality, Cummins has established itself as a trusted name in the commercial truck industry. The company’s commitment to excellence is evident in its wide range of components, including the 153581 Twelve Point Cap Screw, which is designed to meet the high standards required for heavy-duty applications.

Compatibility with Cummins Engines

The Twelve Point Cap Screw 153581 is designed to fit a variety of Cummins engines, ensuring stability and reliability during operation. Here is a detailed look at its compatibility across different engine models:

G855 Series

• G855
• G855 CM558
• KTA19GC CM558

GTA Series

• GTA38 G CMEICS G116C
• GTA855 CM558 (CM2358) G101

ISX and ISZ Series

• ISX CM570
• ISZ13 CM2150 Z105

K Series

• K19
• K38
• K50

N14 Series

• N14 CELECT
• N14 CELECT PLUS
• N14 G
• N14 MECHANICAL

NH/NT 855

• NH/NT 855

QSK Series

• QSK19 CM2350 K114
• QSK19 CM2350 K144G
• QSK19 CM500
• QSK19 CM850 MCRS
• QSK19G
• QSK38 CM2150 MCRS
• QSK38 CM850 MCRS
• QSK45 CM500
• QSK50 CM2150 K107

Component Usage

The 153581 Twelve Point Cap Screw is a versatile fastener that plays a significant role in securing various components within engine systems. Its design allows for efficient torque application and resistance to loosening, making it suitable for a range of applications.

Applications in Engine Systems

Starter Systems

In 12-volt Delco starters and other electrical starting accessories, this screw is used to secure the starter motor mounting. This ensures that the starter remains firmly in place during operation, providing reliable starting performance.

Air Starter Mounting

For air starters, the screw is employed in the air starter mounting to attach the starter to the engine. This secure attachment is essential for the efficient operation of the air starter system.

Buttress Bracket and Dual Barring Mechanisms

The buttress bracket, which supports dual barring mechanisms, often utilizes the Twelve Point Cap Screw to ensure structural integrity. This is particularly important in dual starter systems where multiple starters are used for enhanced engine starting capabilities.

Engine Barring Drive and Mounting Brackets

In engine barring drives and engine mounting brackets, the screw helps to maintain the alignment and stability of the engine components. This is vital for the smooth operation of the engine barring drive, which is used to rotate the engine prior to starting.

Fan and Flywheel Assemblies

For fan mounting and fan shaft mounting brackets, the Twelve Point Cap Screw provides a secure connection that can withstand the vibrations and forces generated during engine operation. Similarly, in flywheel housing and flywheel assemblies, the screw ensures that the flywheel remains securely attached to the engine, contributing to consistent engine performance.

Fuel Transfer Pump and Rear Cover Plate

The screw is also utilized in the mounting of fuel transfer pumps, ensuring that the pump is securely fastened to the engine system. Additionally, it is used in the attachment of the rear cover plate to the engine, providing a sealed and secure enclosure for the engine components.

Starter Motor and Mounting Accessories

In starter motor mounting and various starter mounting accessories, the Twelve Point Cap Screw plays a key role in securing the starter motor to the engine. This is essential for the reliable operation of the starting motor and ensures that it can deliver the necessary torque to start the engine.

Conclusion

Overall, the 153581 Twelve Point Cap Screw is an integral component in the assembly and maintenance of various engine systems, providing the necessary security and stability for optimal performance.