3966976
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, specifically part #3966976 manufactured by Cummins, is a vital component in commercial truck applications. This screw plays a significant role in ensuring the structural integrity and operational efficiency of various truck components. Its design and functionality are tailored to meet the demanding requirements of heavy-duty applications, making it a cornerstone in the assembly and maintenance of commercial vehicles.

Basic Concepts

Hexagon Flange Head Cap Screws are characterized by their hexagonal head and flanged design. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area to distribute the load and prevent the screw from sinking into the material. These screws are commonly used in mechanical assemblies where high tensile strength and resistance to loosening are required. Their design ensures secure fastening in applications subjected to significant stress and vibration ¹.

Purpose and Function

The 3966976 Hexagon Flange Head Cap Screw is specifically designed for use in commercial trucks. It serves to fasten critical components, contributing to the overall structural integrity and operational efficiency of the vehicle. By securely holding parts together, this screw helps maintain the alignment and functionality of truck components, ensuring they operate within specified parameters even under strenuous conditions.

Key Features

The 3966976 Hexagon Flange Head Cap Screw features a hexagonal flange head, which provides a robust interface for tool engagement and load distribution. The screw is typically made from high-strength materials, such as alloy steel, to withstand the rigors of heavy-duty applications. Its threading specifications are designed to ensure a tight and secure fit, minimizing the risk of loosening over time. The flange head also enhances the screw’s ability to resist rotational forces, further securing the fastened components.

Benefits

Using the 3966976 Hexagon Flange Head Cap Screw offers several advantages. The design of the screw enhances fastening security, making it less prone to loosening due to vibration, a common issue in commercial trucks. The material composition ensures durability, allowing the screw to withstand the high stresses and loads encountered in heavy-duty applications. Additionally, the flange head provides added stability, distributing the load more effectively and reducing the risk of damage to the fastened materials.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include corrosion, wear, and loosening. Regular inspection and maintenance are recommended to ensure longevity and reliable performance. If corrosion is detected, the affected area should be cleaned, and a corrosion-resistant coating may be applied. Worn screws should be replaced to maintain the integrity of the fastening. To prevent loosening, it is advisable to use lock washers or thread-locking compounds. Proper torque settings should be adhered to during installation to ensure the screw is tightened to the manufacturer’s specifications ².

About Cummins

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 is committed to quality and innovation in the automotive and engine manufacturing industry. The company’s extensive product range includes components and systems designed to meet the demanding requirements of commercial and industrial applications, ensuring reliability and performance in various environments.

Compatibility with Cummins Engines

The Cummins Hexagon Flange Head Cap Screw part number 3966976 is a versatile component designed to fit a variety of Cummins engines. This screw is integral in securing various parts within the engine assembly, ensuring that components remain tightly fastened and properly aligned. Here is a detailed look at the engines with which this part is compatible:

4B3.9, 6B5.9, 6C8.3, B3.3, B3.9 G, B4.5, B4.5 CM2350 B129B, B4.5 RGT, B5.9 G, B5.9 GAS PLUS CM556

These engines, ranging from the 4B3.9 to the 6C8.3, benefit from the use of the 3966976 screw in their assembly. This screw is often used in securing various engine covers, housings, and other structural components, ensuring that the engine operates smoothly and efficiently.

C GAS PLUS CM556, C8.3 G, F2.8 CM2620 F135B, F3.8 CM2350 F120B, F3.8 CM2350 F128C, F3.8 F102, F4.5 CM2620 F141C

The 3966976 screw is also compatible with the C GAS PLUS CM556 and C8.3 G engines. Additionally, it fits well with the F2.8 CM2620 F135B, F3.8 CM2350 F120B, F3.8 CM2350 F128C, F3.8 F102, and F4.5 CM2620 F141C engines. These engines often require precise fastening solutions to maintain the integrity of their components, and this screw provides the necessary strength and durability.

G5.9, G5.9 CM558, G8.3, G8.3 CM558, GTA8.3 CM558

The 3966976 screw is also suitable for the G5.9, G5.9 CM558, G8.3, G8.3 CM558, and GTA8.3 CM558 engines. These engines typically have complex assemblies that necessitate reliable fastening solutions, and this screw is designed to meet those needs.

ISB CM550, ISB/ISD4.5 CM2150 B119, ISB4.5 CM2350 B104

Lastly, the 3966976 screw is compatible with the ISB CM550, ISB/ISD4.5 CM2150 B119, and ISB4.5 CM2350 B104 engines. These engines often require robust fastening solutions to ensure that all components remain securely in place, and this screw provides the necessary reliability and strength.

Role of Part 3966976 Hexagon Flange Head Cap Screw in Engine Systems

The Hexagon Flange Head Cap Screw (part number 3966976) is instrumental in securing various components within engine systems, ensuring their stability and proper function. Its applications span across multiple critical areas:

Aftercooler and Air Transfer Tube

In the aftercooler system, this screw is utilized to fasten the aftercooler to its mounting points, ensuring a secure fit that allows for efficient cooling of the compressed air. Similarly, in the air transfer tube arrangement, it plays a role in attaching the tube securely, maintaining the integrity of the air pathway from the turbocharger to the engine.

Alternator and Fuel Filter Mounting

For alternator mounting, the Hexagon Flange Head Cap Screw is essential in securing the alternator to the engine block or its designated mounting bracket. This ensures the alternator operates efficiently without vibrations that could affect its performance. In fuel filter mounting, it secures the filter housing, ensuring a leak-free connection and stable filtration of fuel before it reaches the engine.

Turbocharger and Valve Cover

Within the turbocharger arrangement, this screw is used to attach the turbocharger housing to the engine, ensuring a tight seal and efficient operation. On the valve cover, it secures the cover to the engine block, preventing oil leaks and ensuring the valve train components are protected.

Charge Air Cooler Kit and Air Intake Manifold

In the charge air cooler kit, the screw is employed to attach the cooler to its mounting points, facilitating efficient cooling of the intake air. For the air intake manifold, it secures the manifold to the engine, ensuring a proper seal and efficient air distribution to the cylinders.

Oil System Components

The Hexagon Flange Head Cap Screw is also pivotal in the oil system, securing components such as the oil filter, oil filter cooler, and oil level gauge. It ensures these components are firmly attached, allowing for accurate oil level readings and efficient oil filtration.

Thermostat Housing and Rocker Lever

In the thermostat housing, this screw secures the housing to the engine, ensuring the thermostat operates within the correct temperature range. For the rocker lever, it ensures the lever is securely attached to the engine block, allowing for precise valve operation.

Full Flow Oil Filter and Lubricating Oil Filter Kit

For the full flow oil filter and lubricating oil filter kit, the screw is used to secure the filter housing, ensuring efficient oil filtration and protection of engine components.

Front Gear Cover and Doser

In the front gear cover, it secures the cover to the engine, protecting the front gears and ensuring they operate smoothly. For the doser, it secures the doser to its mounting points, ensuring accurate dosing of fluids or additives.

Fuel Pump and Short Block Kit

In fuel pump applications, the screw secures the pump to its mounting bracket, ensuring stable fuel delivery. Within the short block kit, it is used to secure various components, ensuring the engine block is assembled correctly and operates efficiently.

Conclusion

The Hexagon Flange Head Cap Screw (part 3966976) is a versatile component that plays a significant role in securing and maintaining the integrity of various engine system components, contributing to the overall efficiency and reliability of the engine.