4348946
Twelve Point Cap Screw
Cummins®

The 4348946 Twelve-Point Cap Screw, manufactured by Cummins, is a specialized fastener designed for use in commercial truck maintenance and operation. Cummins, a well-established name in the commercial truck industry, produces this component to meet the demanding requirements of heavy-duty applications. This part is integral to ensuring the reliability and performance of commercial trucks, playing a significant role in various mechanical assemblies.

Basic Concepts of Twelve-Point Cap Screws

A twelve-point cap screw is a type of fastener characterized by its hexagonal head with twelve points, as opposed to the six points found on traditional hex cap screws. This design allows for a greater contact area between the wrench and the screw head, which can enhance torque application and reduce the risk of cam-out during tightening ¹. Twelve-point cap screws are often used in applications where precision and high torque are required, providing a more secure fastening solution compared to other types of fasteners.

Purpose and Role in Truck Operation

The 4348946 Twelve-Point Cap Screw is specifically designed to play a role in the operation and maintenance of commercial trucks. It is typically used in applications where high torque and secure fastening are necessary, such as in engine components, transmission systems, and chassis assemblies. The screw’s design ensures that it can withstand the rigors of heavy-duty use, providing a reliable fastening solution in critical areas of the truck.

Key Features

The 4348946 Twelve-Point Cap Screw features a robust design that includes a twelve-point head for enhanced torque application and reduced cam-out risk. It is made from high-strength materials, ensuring durability under heavy-duty conditions ². The screw’s design also includes features that prevent loosening, such as a prevailing torque feature, which helps maintain secure fastening over time.

Benefits

Using the 4348946 Twelve-Point Cap Screw in truck applications offers several benefits. Its design allows for improved torque application, ensuring that components are securely fastened. The screw’s resistance to loosening helps maintain the integrity of mechanical assemblies, reducing the need for frequent re-tightening. Additionally, its durability under heavy-duty conditions ensures long-lasting performance, contributing to the overall reliability of the truck.

Installation Guidelines

Proper installation of the 4348946 Twelve-Point Cap Screw is crucial for ensuring secure and effective fastening. Follow these guidelines for installation:

1. Ensure the mating surface is clean and free of debris.
2. Use the appropriate wrench to engage the twelve-point head, applying torque evenly to avoid cross-threading.
3. Torque the screw to the manufacturer’s specified torque value to ensure proper fastening without over-tightening.
4. Verify the screw is securely fastened and check for any signs of loosening after initial use.

Troubleshooting and Maintenance

Common issues with twelve-point cap screws include corrosion, stripping, and loosening. To address these issues:

• Regularly inspect screws for signs of corrosion and clean as necessary to prevent further degradation.
• Replace any screws that show signs of stripping or damage to maintain secure fastening.
• Periodically check torque values to ensure screws remain properly tightened, especially after exposure to harsh conditions or heavy use.

Cummins: Manufacturer 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 strong reputation in the commercial truck industry for producing reliable and high-performance components. The company’s product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of heavy-duty applications ³.

Twelve-Point Cap Screw Part 4348946 in Cummins Engines

The Twelve-Point Cap Screw part number 4348946 is a critical component in various Cummins engines, ensuring secure fastening and stability. This part is integral to the assembly and maintenance of the VTA903, CM2250, and V105 engines.

VTA903 and CM2250 Engines

In the VTA903 and CM2250 engines, the 4348946 cap screw is utilized in several key areas. It is often employed in the engine’s head assembly, securing the cylinder head to the engine block. This ensures that the combustion chamber is properly sealed, which is vital for maintaining engine efficiency and performance. Additionally, the screw is used in various other components, such as the intake and exhaust manifolds, where it helps to maintain the structural integrity of these parts.

V105 Engine

For the V105 engine, the 4348946 cap screw plays a similar role. It is used in the engine’s head assembly, securing the cylinder head to the engine block. This is crucial for maintaining the proper sealing of the combustion chamber. Furthermore, the screw is employed in the mounting of various engine components, including the turbocharger and other ancillary parts, ensuring that these components remain securely fastened and aligned.

Common Usage Across Engines

Across the VTA903, CM2250, and V105 engines, the 4348946 cap screw is a versatile component. Its twelve-point design provides a better grip and more even distribution of torque, which is essential for maintaining the integrity of the engine’s components. This screw is often used in high-stress areas where reliable fastening is critical to the engine’s operation and longevity.

Part 4348946 Twelve-Point Cap Screw Component Usage

The part 4348946 Twelve-Point Cap Screw is integral in securing various components within engine systems, ensuring stability and reliability.

Manifold Applications

In manifold assemblies, the Twelve-Point Cap Screw is employed to fasten the manifold to the engine block. This secure attachment is essential for maintaining the integrity of the manifold, which routes exhaust gases from the cylinders to the exhaust system. The screw’s design allows for precise torque application, ensuring a leak-free seal that is vital for optimal engine performance. Additionally, it helps in withstanding the high temperatures and pressures present in the manifold, contributing to the overall durability of the assembly.

Water Pump Integration

Within water pump systems, the Twelve-Point Cap Screw plays a significant role in attaching the water pump housing to the engine block. This connection is fundamental for the proper functioning of the cooling system, as it ensures that the water pump can effectively circulate coolant throughout the engine. The screw’s robust construction and precise fit prevent any potential leaks, which could lead to overheating and subsequent engine damage. Furthermore, it aids in maintaining the alignment of the water pump impeller, ensuring efficient coolant flow and consistent engine temperature regulation.

Conclusion

The 4348946 Twelve-Point Cap Screw is a critical component in the maintenance and operation of commercial trucks, particularly in Cummins engines. Its design and features ensure secure fastening, durability, and resistance to loosening, contributing to the overall reliability and performance of the truck. Proper installation and maintenance of this part are essential for ensuring the longevity and efficiency of the vehicle.