3968959
Hexagon Flange Head Cap Screw
Cummins®

The Cummins Hexagon Flange Head Cap Screw (Part #3968959) is a component utilized in commercial truck applications, particularly in heavy-duty trucks. This part plays a role in securing various components within the truck’s mechanical assemblies. Cummins Inc., the manufacturer, is recognized in the industry for its diesel engines and related technologies, providing a range of products designed for durability and performance ¹.

Basic Concepts

The Hexagon Flange Head Cap Screw is characterized by its hexagonal head, which allows for wrench accessibility, and a flange that provides increased surface contact. This design helps in the distribution of clamping force across a larger area, which is beneficial for securing components that experience significant stress or vibration. The screw is typically made from materials such as alloy steel, which offer the necessary strength and corrosion resistance for heavy-duty applications ².

Purpose and Function

In truck operations, the 3968959 secures components and contributes to the structural integrity of the truck. It is used in applications where a strong, vibration-resistant fastening solution is required. The screw’s design ensures that components remain firmly in place, even under the dynamic conditions experienced by heavy-duty trucks ³.

Key Features

The 3968959 features a hexagonal head that allows for easy installation and removal using standard wrenches. The flange provides a larger contact area, which helps in distributing the clamping force more evenly. The cap screw design ensures a snug fit, which is important for maintaining the integrity of the fastened components.

Benefits

Using a Hexagon Flange Head Cap Screw offers several advantages. The flange design improves load distribution, which can help prevent damage to the fastened components. The screw’s resistance to loosening is enhanced by the flange, which reduces the risk of fastener failure. Additionally, the ease of installation and removal facilitates maintenance and repair processes.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include corrosion and stripping. To mitigate these problems, regular inspection and maintenance are recommended. This includes checking for signs of corrosion and ensuring that the screws are tightened to the manufacturer’s specified torque settings. In environments where corrosion is a concern, using screws made from corrosion-resistant materials or applying protective coatings can be beneficial.

Manufacturer Information

Cummins Inc. is a company with a history of innovation in the diesel engine and related technologies market. The company offers a wide range of products designed for various applications, with a commitment to quality and performance. Cummins’ reputation is built on its ability to provide reliable and efficient solutions for the transportation industry, including components like the 3968959.

Compatibility with Cummins Engines

The Hexagon Flange Head Cap Screw, part number 3968959, manufactured by Cummins, is a versatile component designed to fit a variety of Cummins engines. This screw is integral in securing various parts and assemblies within the engine system, ensuring structural integrity and operational efficiency.

ISB Series Engines

• ISB CM2150
• ISB5.9 CM2880 B149
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISX12 CM2350 X102
• ISX12 G CM2180 EJ
• ISX12/ISX11.9 CM2250
• ISZ13 CM2150 Z105

ISC Series Engines

• ISC8.3 CM2250
• ISL9 CM2250

ISF Series Engines

• ISF3.8 CM2220 AN

ISG Series Engines

• ISG11 CM2880 G108
• ISG12 CM2880 G107
• ISG12 G CMOH6.0 G111

QSB Series Engines

• QSB4.5 CM2250 EC
• QSB5.9 CM850
• QSB6.7 CM2250
• QSB6.7 CM850(CM2850)
• QSB7 CM2880 B117

QSC Series Engines

• QSC8.3 CM850(CM2850)
• QSC9 CM2250/QSL9 CM2250

QSF Series Engines

• QSF3.8 CM2350 F107
• QSF3.8 CM2880 F112

This comprehensive compatibility ensures that the 3968959 is a reliable choice for securing parts across a wide range of Cummins engines.

Applications in Engine Systems

The Hexagon Flange Head Cap Screw (Part 3968959) is a versatile fastener employed across various engine systems to ensure secure and reliable connections. Its application spans multiple components, contributing to the overall integrity and performance of the engine.

Air Intake System

In the air intake system, the screw is utilized to fasten the air intake connection to the air intake manifold. This secure attachment ensures that the airflow into the engine is consistent and unimpeded, which is essential for optimal combustion efficiency.

Electrical and Accessory Mounting

For the alternator, this part plays a significant role in both the alternator mounting and alternator support. It provides the necessary tension and stability to keep the alternator firmly in place, ensuring efficient power generation and reduced vibration during operation.

Cooling System Components

In the cooling system, the screw is employed in the engine oil cooler and thermostat housing. These applications help maintain the structural integrity of these components, ensuring they can withstand the thermal stresses and pressures associated with engine operation.

Front Engine Components

The front engine guard and front gear cover also benefit from the use of this screw. It secures these components, protecting internal engine parts from debris and ensuring that the gear cover remains sealed to prevent oil leaks.

Fuel System

Within the fuel system, the Hexagon Flange Head Cap Screw is used in the fuel transfer pump and intake connection mounting. This ensures that the fuel lines and connections remain secure, facilitating consistent fuel delivery to the engine.

Oil Management

For oil management components like the oil level gauge and oil pan, this screw provides the necessary fastening strength. It ensures that these components are securely attached, preventing oil leaks and maintaining accurate oil level readings.

Valve Train

In the valve train, the screw is used to secure the rocker lever, ensuring that the valve operation remains precise and reliable. This is vital for maintaining proper valve timing and engine performance.

Turbocharging

In turbocharged engines, the screw is part of the turbocharger arrangement, helping to secure the turbocharger to the engine. This ensures that the turbocharger operates efficiently, contributing to increased engine power and performance.

Water Pump

Finally, in the water pump drive, the Hexagon Flange Head Cap Screw ensures that the water pump is securely attached to the engine. This is essential for maintaining consistent coolant flow, which is critical for engine temperature regulation.

Conclusion

Overall, the Hexagon Flange Head Cap Screw (Part 3968959) is a fundamental component in ensuring the secure and reliable operation of various engine systems. Its widespread application underscores its importance in maintaining engine performance and durability.