3900633
Hexagon Flange Head Cap Screw
Cummins®

The Cummins Hexagon Flange Head Cap Screw (Part #3900633) is a specialized fastener designed for use in commercial truck applications, particularly in heavy-duty trucks. This part is integral to the mechanical systems of these vehicles, providing secure fastening and contributing to the overall structural integrity and performance.

Basic Concepts and Functionality

The Hexagon Flange Head Cap Screw is characterized by its unique design, which includes a hexagonal head, a flange beneath the head, and a threaded shank. The hexagonal head allows for easy tightening and loosening using a wrench or socket, ensuring precise torque application ⁴. The flange serves to distribute the load more evenly across the surface it contacts, reducing the risk of damage to the fastened material. Typically, these screws are made from high-strength materials such as alloy steel, which provide durability and resistance to environmental factors like corrosion and wear ¹.

Purpose and Application

In truck operations, the 3900633 Hexagon Flange Head Cap Screw plays a significant role in securing various components. It is used in applications where high tensile strength and resistance to vibration are required. By ensuring that components remain firmly in place, this screw contributes to the structural integrity of the truck. Its application is vital in areas subjected to significant stress and dynamic loads, such as engine mounts, chassis components, and other critical assemblies ².

Key Features

Several key features distinguish the 3900633 Hexagon Flange Head Cap Screw:

• Flange Design: The flange beneath the head helps in distributing the load, which minimizes the risk of the screw pulling through the material.
• Hexagonal Head: This design allows for efficient and secure tightening using standard tools, ensuring that the correct torque is applied.
• Material Properties: Constructed from high-strength alloy steel, the screw offers excellent durability and resistance to corrosion, making it suitable for harsh operating conditions ³.

Benefits

Using the 3900633 Hexagon Flange Head Cap Screw provides several advantages:

• Improved Fastening Security: The design ensures a secure hold, reducing the likelihood of component failure.
• Ease of Installation and Removal: The hexagonal head allows for straightforward installation and removal, facilitating maintenance procedures.
• Resistance to Vibration Loosening: The screw’s design and material properties help it withstand vibrations, which are common in heavy-duty truck operations.
• Longevity in Harsh Conditions: Its corrosion-resistant properties ensure longevity even in demanding environments.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include corrosion, over-tightening, and thread damage. Regular inspection is recommended to identify any signs of wear or damage. Proper torque application is crucial to avoid over-tightening, which can lead to thread stripping or material damage. Maintenance practices should include cleaning the screw and its surroundings to prevent corrosion and ensuring that all fasteners are periodically checked for tightness ⁴.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history of innovation and a strong commitment to quality, Cummins has established itself as a trusted name in the automotive and heavy-duty truck industries. The company’s expertise in diesel engines and related technologies underscores its dedication to providing reliable and efficient solutions for its customers.

Cummins Hexagon Flange Head Cap Screw 3900633 Compatibility

The Cummins Hexagon Flange Head Cap Screw part number 3900633 is designed to fit a variety of Cummins engines, ensuring secure fastening and reliable performance. Here is a detailed overview of its compatibility with different engine models:

15N CM2380 M104B

The 3900633 screw is compatible with the 15N CM2380 M104B engine, providing a robust solution for securing various components within this engine model.

4B3.9 and 6B5.9

This screw fits seamlessly with both the 4B3.9 and 6B5.9 engines, offering a reliable fastening option for critical engine parts.

6C8.3 and C8.3 G

The 3900633 screw is also suitable for the 6C8.3 and C8.3 G engines, ensuring that all fastened components remain securely in place.

B3.9 G and B4.5 Series

The screw is compatible with the B3.9 G engine and the B4.5 series, which includes B4.5, B4.5 CM2350 B129B, and B4.5 RGT. This ensures that all these engines can benefit from the secure fastening provided by the 3900633 screw.

B5.6 CM2670 B152B and B5.9 Series

The 3900633 screw fits the B5.6 CM2670 B152B engine and the B5.9 series, which includes B5.9, B5.9 CM2670 B166C, B5.9 G, and B5.9 GAS PLUS CM556. This compatibility ensures secure fastening across these engine models.

B6.7 Series

The screw is compatible with the B6.7 series engines, which include B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, and B6.7S. This ensures that all these engines can utilize the 3900633 screw for reliable fastening.

C GAS PLUS CM556

The 3900633 screw is also compatible with the C GAS PLUS CM556 engine, providing a secure fastening solution for this model.

D4.0 CM2620 D103B

This screw fits the D4.0 CM2620 D103B engine, ensuring that all fastened components remain securely in place.

F2.8 CM2620 F135B

The 3900633 screw is compatible with the F2.8 CM2620 F135B engine, providing a reliable fastening option for this model.

F3.8 Series

The screw fits the F3.8 series engines, which include F3.8 CM2350 F120B, F3.8 CM2350 F128C, F3.8 CM2620 F137B, and F3.8 F102. This compatibility ensures that all these engines can benefit from the secure fastening provided by the 3900633 screw.

This comprehensive compatibility ensures that the Cummins Hexagon Flange Head Cap Screw part number 3900633 can be used across a wide range of Cummins engine models, providing a reliable and secure fastening solution for various components.

Role of Part 3900633 Hexagon Flange Head Cap Screw in Engine Systems

The part 3900633 Hexagon Flange Head Cap Screw is instrumental in securing and maintaining the integrity of various components within engine systems. Its robust design ensures reliable fastening in high-stress environments.

Air Transfer Tube

In the air transfer tube system, the Hexagon Flange Head Cap Screw is used to secure connections, ensuring airtight seals that are vital for efficient airflow to the engine.

Alternator Mounting and Support Kit

For alternator mounting, this screw plays a key role in attaching the alternator to the engine block or bracket, providing the necessary stability and vibration resistance.

Belt Tensioner Kit

Within the belt tensioner kit, it is employed to fasten the tensioner assembly, ensuring proper belt tension which is essential for the operation of auxiliary components like the alternator and water pump.

Bosch Injection Pump

In the Bosch injection pump setup, the screw is utilized to secure the pump to the engine, maintaining alignment and stability crucial for precise fuel delivery.

Charge Air Cooler Kit

For the charge air cooler kit, it secures the cooler to the engine bay, ensuring it remains firmly in place despite the vibrations and thermal expansions experienced during operation.

Valve Cover and Drive Alternator

On the valve cover and drive alternator, the screw ensures these components are tightly fastened, preventing oil leaks and ensuring smooth operation of the alternator.

Full Flow Oil Filter and Front Gear Housing

It is also used in attaching the full flow oil filter and front gear housing, critical for maintaining oil flow and gear integrity within the engine.

Oil Level Gauge and Rear Gear Housing

The screw secures the oil level gauge and rear gear housing, ensuring accurate oil level readings and stable gear operation.

Injector Plumbing and Fuel Filter Location

In injector plumbing and at the fuel filter location, it ensures all connections are secure, preventing leaks and maintaining fuel system integrity.

Intake Connection Mounting

For intake connection mounting, the screw provides a stable attachment point, ensuring the intake system remains securely in place.

Oil Cooler Housing and Oil Pan

It is instrumental in fastening the oil cooler housing and oil pan, crucial for maintaining the structural integrity and sealing of these components.

Fuel Drain and Turbocharger Plumbing

In fuel drain and turbocharger plumbing, the screw ensures all connections are tight, preventing leaks and ensuring efficient turbocharger operation.

Lubricating Oil and Vacuum Pump

For lubricating oil and vacuum pump systems, it secures these components, ensuring they operate within the required parameters for engine performance.

Short Block and Short Engine Kit

In the short block and short engine kit, the screw is used to fasten various components, ensuring the structural integrity of the engine assembly.

Thermostat Housing and Turbocharger Arrangement

Finally, in the thermostat housing and turbocharger arrangement, it ensures these components are securely attached, contributing to efficient engine cooling and turbocharger performance.

Conclusion

The Cummins Hexagon Flange Head Cap Screw (Part #3900633) is a critical component in the maintenance and operation of heavy-duty truck engines. Its unique design, high-strength material, and compatibility with a wide range of Cummins engines make it an indispensable part for ensuring secure fastening and reliable performance in demanding environments.