4947933
Twelve Point Cap Screw
Cummins®

The 4947933 Twelve Point Cap Screw is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This cap screw is designed for use in various applications within commercial trucks, providing reliable fastening solutions that contribute to the overall performance and durability of the vehicle.

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 increased torque application and reduced risk of cam-out during tightening. Unlike traditional hex cap screws, which have six points, twelve point cap screws offer a denser arrangement of points, enhancing their resistance to stripping and providing a more secure fit. These screws are commonly used in mechanical assemblies where high torque and secure fastening are required ¹.

Purpose of the 4947933 Twelve Point Cap Screw in Truck Operation

The 4947933 Twelve Point Cap Screw plays a role in the operation and maintenance of commercial trucks by securing critical components and assemblies. It is often used in applications where high torque is necessary, such as in engine mounts, transmission housings, and chassis components. The screw ensures that parts remain firmly in place, contributing to the structural integrity and performance of the truck.

Key Features of the 4947933 Twelve Point Cap Screw

The 4947933 Twelve Point Cap Screw is designed with several features that make it suitable for heavy-duty applications. Its thread design provides a strong grip, while the twelve-point head shape allows for higher torque application without the risk of cam-out. The material composition, typically a high-strength alloy, ensures durability and resistance to corrosion, making it ideal for the demanding environments encountered in commercial trucking.

Benefits of Using the 4947933 Twelve Point Cap Screw

The 4947933 Twelve Point Cap Screw offers several advantages. Its design allows for increased torque application, which is beneficial in applications where secure fastening is critical. The twelve-point head provides enhanced resistance to stripping, reducing the likelihood of damage during installation or removal. Additionally, the screw’s design offers improved security against loosening, ensuring that fastened components remain in place over time.

Installation Guidelines

Proper installation of the 4947933 Twelve Point Cap Screw is important for optimal performance and longevity. To install, ensure that the mating threads are clean and free of debris. Use a torque wrench to apply the specified torque, avoiding over-tightening, which can damage the threads or the fastener. It is also advisable to apply a thread locker to prevent loosening due to vibration.

Troubleshooting Common Issues

Common issues with twelve point cap screws include corrosion, over-tightening, and thread damage. To address corrosion, regularly inspect the fastener and surrounding components, and apply a corrosion-resistant coating if necessary. Over-tightening can be prevented by using a torque wrench and following the manufacturer’s torque specifications. Thread damage can be minimized by ensuring that the mating threads are clean and by avoiding cross-threading during installation ².

Maintenance Tips

Regular maintenance of the 4947933 Twelve Point Cap Screw can prolong its life and ensure continued performance. Inspect the screw and surrounding components for signs of wear or corrosion during routine maintenance checks. Clean the fastener and mating surfaces to remove any debris or contaminants. Re-torque the screw periodically to ensure that it remains securely fastened, especially in applications subject to vibration or dynamic loads.

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 reliability in the commercial truck industry. The company offers a wide range of products, including engines, powertrains, and aftermarket parts, designed to meet the demanding requirements of commercial trucking applications.

Twelve Point Cap Screw (Part 4947933) in Cummins Engines

The Twelve Point Cap Screw, identified by part number 4947933, is a critical component in the assembly and maintenance of several Cummins engines. This part is specifically designed to provide robust fastening solutions, ensuring that various engine components are securely held in place.

Cummins B3.3 Engine

In the Cummins B3.3 engine, the Twelve Point Cap Screw is utilized in several key areas. Its high strength and precise threading ensure that engine parts such as the cylinder head, intake manifold, and exhaust manifold are tightly secured. This helps maintain the integrity of the engine’s structure and performance.

Cummins QSB3.3 CM2150 and QSB3.3 CM2250 EC Engines

For the Cummins QSB3.3 CM2150 and QSB3.3 CM2250 EC engines, the Twelve Point Cap Screw (4947933) plays a similar role. These engines, known for their reliability and efficiency, require precise fastening to ensure optimal operation. The cap screw is used in the assembly of the engine block, cylinder head, and other critical components. Its design allows for easy installation and removal, which is crucial during routine maintenance and repairs.

The Twelve Point Cap Screw is essential in these engines due to its ability to withstand high levels of stress and torque. This ensures that the engine components remain securely fastened under various operating conditions, contributing to the overall durability and performance of the engine.

Role of Part 4947933 Twelve Point Cap Screw in Engine Systems

In engine systems, the part 4947933 Twelve Point Cap Screw is instrumental in ensuring the secure assembly and reliable operation of various components.

Housing Assembly

Within the housing, the Twelve Point Cap Screw is utilized to fasten critical elements that contribute to the structural integrity of the engine. It secures the housing to the engine block, ensuring that all internal components are held in precise alignment. This alignment is essential for the efficient transfer of power and the reduction of vibrations, which can otherwise lead to wear and potential failure of the engine components.

Flywheel Attachment

The flywheel is another component where the Twelve Point Cap Screw plays a significant role. It is used to attach the flywheel to the crankshaft, ensuring a robust connection that can withstand the high torque and rotational forces generated during engine operation. This secure attachment is vital for the smooth operation of the engine, as it directly impacts the engine’s ability to start, idle, and accelerate smoothly.

The use of a Twelve Point Cap Screw in these applications provides enhanced torque application capabilities, reducing the risk of cam-out and ensuring that the fastener remains tight under dynamic engine conditions ³.

Conclusion

The 4947933 Twelve Point Cap Screw is a vital component in the assembly and maintenance of commercial trucks and Cummins engines. Its design, featuring a twelve-point head and high-strength alloy composition, ensures secure fastening and resistance to corrosion. Proper installation, regular maintenance, and troubleshooting of common issues are essential for the longevity and performance of this Cummins part. By understanding the role and benefits of the Twelve Point Cap Screw, technicians and engineers can ensure the reliable operation of commercial trucks and engines.