3922953
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw (Part #3922953) by Cummins is a specialized fastener designed for use in commercial truck maintenance. It plays a role in ensuring the integrity and functionality of truck components by providing secure and reliable fastening solutions. This screw is integral to maintaining the structural and operational integrity of various truck parts, contributing to the overall efficiency and safety of commercial vehicles.

Basic Concepts of Twelve Point Cap Screws

A twelve point cap screw is a type of fastener that features a twelve-sided head instead of the more common six-sided (hexagonal) head found on standard cap screws. This design allows for a greater contact area between the screw head and the driving tool, which can enhance torque application and reduce the risk of cam-out—a situation where the driving tool slips out of the screw head ¹. The twelve-point design also provides more engagement points, which can improve the screw’s resistance to loosening over time.

Purpose and Role in Truck Operation

This Cummins part serves a specific purpose in the context of commercial trucks. It is used to fasten various components securely, ensuring that parts remain in place under the demanding conditions of truck operation. This screw contributes to the overall operation and maintenance of truck components by providing a reliable fastening solution that can withstand high levels of stress and vibration.

Key Features

The Twelve Point Cap Screw (Part #3922953) is characterized by several key features that enhance its performance and durability. Its twelve-sided head design allows for better torque application and reduced risk of cam-out. The screw is typically made from high-strength materials, such as alloy steel, to ensure it can withstand the rigors of commercial truck use. Additionally, it may feature a coated surface to resist corrosion and improve longevity.

Benefits

This part offers several benefits that make it a preferred choice for commercial truck maintenance. Its design allows for improved torque application, which can lead to more secure fastening. The reduced risk of cam-out ensures that the screw can be tightened and loosened with greater ease and reliability. Furthermore, the enhanced fastening security provided by the twelve-point head helps to prevent loosening over time, which is crucial for maintaining the integrity of truck components.

Installation and Usage Guidelines

Proper installation of the Twelve Point Cap Screw (Part #3922953) is vital to ensure optimal performance. It should be installed using the appropriate driving tool to engage all twelve points on the screw head. Recommended torque settings should be followed to avoid over-tightening, which can damage the screw or the component being fastened. Best practices include using a torque wrench to achieve the specified torque and ensuring that the screw is installed in a clean, undamaged thread to maximize holding power ².

Troubleshooting and Maintenance

Common issues with the Twelve Point Cap Screw (Part #3922953) may include loosening over time or damage to the screw head. Troubleshooting steps can involve checking for proper torque settings and ensuring that the screw is installed in the correct orientation. Regular maintenance, such as inspecting for signs of wear or corrosion, can help prolong the lifespan and effectiveness of the screw. If damage is detected, replacement may be necessary to maintain the integrity of the fastened components.

Cummins: A Brief 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 a reputation for quality and innovation in the commercial truck industry. The company is committed to providing reliable and durable components that meet the demanding requirements of commercial vehicle applications. Cummins’ product range includes a variety of engine and component solutions designed to enhance the performance and efficiency of trucks and other heavy-duty equipment.

Twelve Point Cap Screw 3922953 Compatibility with Cummins Engines

The Twelve Point Cap Screw part number 3922953, manufactured by Cummins, is a versatile component designed to fit a wide range of Cummins engines. This screw is integral in securing various parts and assemblies within the engine, ensuring structural integrity and operational efficiency.

Cummins B Series Engines

The Twelve Point Cap Screw 3922953 is compatible with several models in the Cummins B Series, including:

• B5.9
• B5.9 G
• B5.9 GAS PLUS CM556

These engines often require precise fastening solutions to maintain their operational standards, and the 3922953 screw is engineered to meet these needs.

Cummins ISB Series Engines

The ISB series engines, known for their reliability and performance, also utilize the 3922953 screw in various models:

• ISB CM2150
• ISB CM550
• ISB CM850
• ISB/ISD6.7 CM2150 SN
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118

These engines are used in a variety of applications, from heavy-duty trucks to industrial machinery, and the 3922953 screw ensures that all components are securely fastened.

Cummins ISBE Series Engines

The ISBE series, which includes:

• ISBE CM2150
• ISBE4 CM850

also benefit from the use of the 3922953 screw. These engines are designed for high-performance applications, and the screw’s strength and precision are crucial for maintaining engine integrity.

Cummins ISC Series Engines

The ISC series engines, which are known for their durability and efficiency, include:

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

The 3922953 screw is used across these models to ensure that all parts are securely fastened, contributing to the engine’s overall performance and longevity.

Cummins ISL Series Engines

The ISL series engines, which are widely used in various applications, include:

• ISL CM2150
• ISL CM554
• ISL9 CM2150 SN
• ISL9 CM2250

These engines require reliable fastening solutions, and the 3922953 screw is designed to provide the necessary strength and precision.

Cummins QSB Series Engines

The QSB series engines, which are known for their versatility and performance, include:

• QSB5.9 30 CM550
• QSB5.9 44 CM550
• QSB6.7 CM850 (CM2850)

The 3922953 screw is compatible with these engines, ensuring that all components are securely fastened, which is essential for maintaining engine performance and reliability.

The Twelve Point Cap Screw 3922953 is a critical component in the assembly and maintenance of these Cummins engines, providing the necessary strength and precision to ensure that all parts are securely fastened.

Role of Part 3922953 Twelve Point Cap Screw in Engine Systems

Drive System Integration

In the drive system, this part is utilized to secure various components that contribute to the efficient transfer of power from the engine to the wheels. This includes fastening critical elements such as the driveshaft, differential housing, and transmission mounts. By providing a robust and reliable connection, it ensures that these components remain securely in place under the dynamic loads and vibrations experienced during operation.

Fan Assembly Application

Within the fan assembly, this part plays a significant role in maintaining the structural integrity of the system. It is employed to attach the fan blades to the fan hub, ensuring that the blades remain firmly positioned and operate efficiently to provide adequate cooling for the engine. Additionally, it secures the fan shroud and other supporting structures, which are essential for directing airflow and enhancing the overall cooling performance of the engine compartment.

Turbocharger Component Fastening

In turbocharger applications, this part is instrumental in assembling and securing various turbocharger components. It is used to fasten the turbine housing to the compressor housing, ensuring a leak-free seal that is vital for maintaining the turbocharger’s efficiency. Furthermore, it secures the turbocharger to the engine block or exhaust manifold, providing the necessary stability to withstand the high-pressure and high-temperature environments in which turbochargers operate. This reliable fastening is essential for the turbocharger to function correctly and enhance the engine’s performance by increasing air intake and overall power output.

Conclusion

The Twelve Point Cap Screw (Part #3922953) by Cummins is a critical component in the maintenance and operation of commercial trucks. Its unique design and robust construction make it an essential part for securing various engine components, ensuring the structural and operational integrity of the vehicle. Proper installation, regular maintenance, and understanding its role in different engine systems are key to maximizing the effectiveness of this part in commercial truck applications.