3901235
Hexagon Head Cap Screw
Cummins®

The 3901235 Hexagon Head Cap Screw, manufactured by Cummins, is a specialized fastener designed for use in commercial truck applications. Cummins, a well-established name in the commercial truck industry, produces this screw to meet the demanding requirements of heavy-duty truck operations. This part is significant due to its robust design and reliable performance, which contribute to the overall efficiency and safety of truck assemblies.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of fastener characterized by its hexagonal head, which allows for efficient tightening and loosening using a wrench or socket. The design of the cap screw includes a threaded shank that extends through the components being joined, and a head that distributes the clamping force over a larger area. Cap screws are commonly used in mechanical assemblies where high tensile strength and secure fastening are required. They are often employed in applications where vibration resistance is crucial, such as in the automotive and heavy-duty truck industries ¹.

Purpose of the 3901235 Hexagon Head Cap Screw in Truck Operations

This Cummins part plays a specific role in the operation and maintenance of commercial trucks. It is utilized in various truck assemblies where secure and durable fastening is necessary. Common applications include fastening engine components, securing chassis parts, and attaching body panels. The screw’s design ensures that it can withstand the stresses and vibrations encountered in truck operations, providing reliable performance over time.

Key Features

The 3901235 Hexagon Head Cap Screw boasts several key features that enhance its effectiveness and durability in truck applications. These include:

• Material Composition: The screw is typically made from high-strength alloy steel, which provides excellent tensile strength and resistance to wear and corrosion ².
• Thread Type: It features a coarse thread, which allows for quick and secure fastening. The thread design also contributes to the screw’s resistance to loosening under vibration.
• Head Design: The hexagonal head is designed to prevent cam-out, ensuring that the screw can be tightened and loosened with minimal risk of the wrench slipping.

These features collectively contribute to the screw’s ability to maintain a secure fastening in demanding truck applications.

Benefits

Using the 3901235 Hexagon Head Cap Screw offers several benefits:

• Enhanced Fastening Security: The screw’s design and material properties ensure a strong and secure connection between components.
• Resistance to Vibration: The coarse thread and high-strength material provide excellent resistance to loosening due to vibration, which is common in truck operations.
• Ease of Installation and Removal: The hexagonal head allows for efficient tightening and loosening, reducing the time and effort required during installation and maintenance.

Installation Guidelines

Proper installation of the 3901235 Hexagon Head Cap Screw is crucial for optimal performance and longevity. Follow these guidelines:

1. Prepare the Components: Ensure that the surfaces to be joined are clean and free of debris.
2. Align the Screw: Position the screw so that it aligns with the pre-drilled holes in the components.
3. Use the Correct Tool: Employ a wrench or socket that fits the hexagonal head snugly to avoid slippage.
4. Apply Torque: Tighten the screw to the recommended torque specification using a torque wrench. This ensures that the screw is secured properly without over-tightening, which could damage the components or the screw itself.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration and corrosion. To troubleshoot these problems:

• Check for Looseness: Regularly inspect the screws for signs of loosening and re-tighten as necessary.
• Protect Against Corrosion: Apply a corrosion-resistant coating or use screws made from stainless steel in environments where corrosion is a concern ³.
• Replace Damaged Screws: If a screw shows signs of wear or damage, replace it promptly to maintain the integrity of the fastening.

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 high-quality, reliable components. The company’s commitment to innovation and customer satisfaction makes it a trusted source for truck components, including the 3901235 Hexagon Head Cap Screw.

Compatibility with Cummins Engines

This Cummins part is designed to be compatible with a range of Cummins engines. It is a critical component in various engine assemblies, ensuring secure fastening and stability. Below is a detailed breakdown of its compatibility with specific Cummins engine models:

4B3.9 and 6B5.9 Engines

The 4B3.9 and 6B5.9 engines are part of Cummins’ lineup of industrial and marine engines. The 3901235 screw is used in these engines for securing various components, including engine mounts, brackets, and other structural parts. Its robust design ensures that these components remain tightly fastened under operational stresses.

B3.9 G, B5.9 G, and G5.9 Engines

The B3.9 G, B5.9 G, and G5.9 engines are another set of Cummins engines where the 3901235 screw is utilized. These engines are typically found in agricultural and construction equipment. The screw’s application in these engines includes securing the engine block, cylinder heads, and other critical parts, ensuring the engine’s integrity and performance.

B5.9 GAS PLUS CM556 and ISB5.9G CM2180 Engines

The B5.9 GAS PLUS CM556 and ISB5.9G CM2180 engines are high-performance models used in heavy-duty applications. The 3901235 Hexagon Head Cap Screw is integral in these engines for fastening components that are subjected to high loads and stresses. Its use in these engines ensures that all parts are securely held together, contributing to the engine’s overall reliability and durability.

Role of Part 3901235 Hexagon Head Cap Screw in Engine Systems

This part is integral to the assembly and maintenance of various engine components. Its primary function is to secure and fasten parts together, ensuring they remain in place under the operational stresses of an engine.

Gauge Assembly

In the gauge assembly, the Hexagon Head Cap Screw is used to mount the gauge to the engine’s housing. This secure attachment ensures that the gauge remains stable and accurately measures parameters such as temperature, pressure, or other vital metrics. The screw’s hexagonal head allows for precise torque application, which is essential for maintaining the gauge’s calibration and reliability.

Oil Level Sensor

For the oil level sensor, the Hexagon Head Cap Screw plays a key role in attaching the sensor to the engine block or oil pan. This secure fastening is vital for the sensor to provide accurate readings of the oil level. Proper installation ensures that the sensor can withstand vibrations and maintain consistent contact with the oil, leading to reliable performance and timely alerts for oil changes or top-ups.

Oil Pan

In the oil pan assembly, the Hexagon Head Cap Screw is employed to attach various components such as baffles, drain plugs, and mounting brackets. These screws ensure that all parts of the oil pan are firmly in place, preventing leaks and ensuring the oil pan can effectively contain and circulate oil throughout the engine. The robust nature of the Hexagon Head Cap Screw is particularly beneficial in this application, where durability and resistance to loosening are paramount.

Oil Filter Housing

The oil filter housing also benefits from the use of the Hexagon Head Cap Screw. It secures the housing to the engine block, ensuring a tight seal that prevents oil leaks. The screw’s design allows for easy installation and removal, facilitating routine maintenance and filter changes without compromising the integrity of the seal.

Conclusion

Overall, the 3901235 Hexagon Head Cap Screw is a versatile and reliable component that enhances the functionality and durability of various engine systems. Its application across different assemblies underscores its importance in maintaining the overall performance and safety of the engine.