3900469
Hexagon Head Cap Screw
Cummins®

The Cummins part number 3900469, a Hexagon Head Cap Screw, is integral to the assembly and maintenance of commercial trucks. This screw ensures secure fastening in various applications, maintaining the integrity and functionality of truck components.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is characterized by its hexagonal socket head, allowing efficient tightening and loosening with a hex key or socket wrench. The hexagonal shape resists cam-out, ensuring the tool remains engaged with the screw head during use. These screws are commonly used where a flush or countersunk finish is required, as the head design allows for minimal protrusion above the fastened surface ¹.

Role of the 3900469 Hexagon Head Cap Screw in Truck Operation

This Cummins part is utilized in various applications within commercial trucks. It secures components and assemblies, ensuring parts remain firmly in place under operational stresses. Common uses include fastening engine components, chassis parts, and other critical assemblies where vibration and load are significant factors. The screw’s design and material properties make it suitable for these demanding applications ².

Key Features

The 3900469 features several key attributes that enhance its performance and durability. It is typically made from high-strength steel, providing the necessary tensile strength to withstand significant loads. The screw has a fully threaded design, allowing it to engage fully with the mating part, which enhances fastening security. Additionally, it may feature special coatings or treatments, such as zinc plating or black oxide, to improve corrosion resistance and extend service life in harsh environments ³.

Benefits

This part offers several benefits in commercial truck applications. Its design ensures improved fastening security, reducing the risk of component loosening due to vibration. The material and coatings used enhance its durability, allowing it to perform reliably in demanding truck environments. Furthermore, the hexagonal head design facilitates easy and efficient tightening and loosening, contributing to streamlined maintenance procedures.

Troubleshooting and Maintenance

Common issues associated with Hexagon Head Cap Screws include loosening, corrosion, and damage. To address these problems, regular inspection and maintenance are recommended. If screws show signs of loosening, they should be re-tightened to the specified torque. Corrosion can be mitigated by ensuring that screws are properly coated and by applying protective treatments as needed. Damaged screws should be replaced to maintain the integrity of the fastened components. Regular maintenance practices, such as cleaning and lubricating screw interfaces, can also help ensure optimal performance.

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 expertise in diesel engines and related technologies, Cummins is committed to providing high-quality components for the commercial truck industry. Their products are designed to meet the rigorous demands of heavy-duty applications, ensuring reliability and performance in various operating conditions.

Hexagon Head Cap Screw 3900469 in Cummins Engines

The Cummins Hexagon Head Cap Screw part number 3900469 is a critical component in various Cummins engine models. This screw is designed to secure different parts within the engine, ensuring structural integrity and proper functioning. Below is a detailed look at how this part integrates with specific Cummins engines:

4B3.9 and QSB3.9 30 CM550

The 4B3.9 and QSB3.9 30 CM550 engines utilize the 3900469 screw in several applications. This includes securing the engine block, cylinder heads, and various other components that require a reliable fastening solution. The screw’s design ensures that these parts remain tightly fastened under the high stress and vibration conditions typical of diesel engines.

6B5.9 and QSB5.9 30 CM550

In the 6B5.9 and QSB5.9 30 CM550 engines, the 3900469 screw is used extensively in the assembly of the engine block and cylinder heads. Its robust construction is essential for maintaining the alignment and stability of these critical components, ensuring the engine operates smoothly and efficiently.

6C8.3 and C8.3 G

The 6C8.3 and C8.3 G engines also benefit from the use of the 3900469 screw. This part is integral in securing the engine’s internal and external components, providing the necessary strength and durability to withstand the operational demands of these engines.

B4.5, B5.9 G, and B5.9 GAS PLUS CM556

For the B4.5, B5.9 G, and B5.9 GAS PLUS CM556 engines, the 3900469 screw is used in various applications, including the fastening of the engine block and other structural components. Its precision and reliability make it an ideal choice for these engines, ensuring that all parts are securely held in place.

ISB CM550, ISX CM570, and ISX CM870

In the ISB CM550, ISX CM570, and ISX CM870 engines, the 3900469 screw plays a crucial role in maintaining the integrity of the engine’s components. This includes securing the engine block, cylinder heads, and other parts that require a dependable fastening solution. The screw’s design ensures that these components remain tightly fastened, even under the high stress and vibration conditions typical of these powerful engines.

The 3900469 screw is a testament to Cummins’ commitment to quality and reliability, providing a dependable fastening solution across a wide range of their engine models.

Role of Part 3900469 Hexagon Head Cap Screw in Engine Systems

The part 3900469 Hexagon Head Cap Screw is instrumental in securing various components within engine systems, ensuring stability and proper function.

Alternator Location

In the alternator location setup, this screw is used to firmly attach the alternator to its mounting bracket. This secure attachment is essential for maintaining the alternator’s alignment and ensuring it operates efficiently to generate electrical power for the vehicle.

Compressor and Refrigerant System

Within the compressor and refrigerant system, the Hexagon Head Cap Screw plays a significant role in securing the compressor to its mounting points. This ensures that the compressor remains stable during operation, which is vital for the efficient compression of refrigerant and the overall performance of the air conditioning system.

Engine Installation

During engine installation, this screw is often used to attach various components to the engine block or frame. Its robust design ensures that these components remain securely in place, even under the high vibrations and stresses encountered during engine operation.

Lever and Rocker Mounting

In systems involving levers and rockers, such as those found in valvetrains, the Hexagon Head Cap Screw is used to mount these components securely. This ensures precise and reliable operation of the valvetrain, which is essential for the engine’s combustion process.

Alternator Mounting

Similar to its role in the alternator location, this screw is also critical in the alternator mounting process. It ensures that the alternator is held firmly in place, allowing it to spin smoothly and generate the necessary electrical power without wobbling or misalignment.

Refrigerant Compressor Spacer and Fan

In applications involving refrigerant compressor spacers and fans, the Hexagon Head Cap Screw is used to maintain the correct spacing and alignment. This is particularly important in ensuring that the fan operates efficiently and that the refrigerant compressor functions without interference from adjacent components.

Fan Pilot

Finally, in the fan pilot system, this screw is used to secure the fan pilot in place. This ensures that the fan pilot operates correctly, contributing to the overall cooling efficiency of the engine.

Overall, the part 3900469 Hexagon Head Cap Screw is a versatile and reliable component that plays a significant role in the secure and efficient operation of various engine systems.

Conclusion

The Cummins part number 3900469, a Hexagon Head Cap Screw, is a critical component in the assembly and maintenance of commercial trucks and various Cummins engine models. Its robust design, material properties, and key features ensure secure fastening and reliable performance in demanding applications. Regular maintenance and proper use of this part contribute to the overall efficiency and longevity of truck and engine systems.