3412921
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, specifically part #3412921 by Cummins, is a vital component in commercial truck applications. This screw is designed to provide secure fastening in various truck assemblies, ensuring the integrity and reliability of the vehicle’s components. Its robust construction and specialized design make it a preferred choice for heavy-duty applications where durability and performance are paramount.

Basic Concepts

The Hexagon Flange Head Cap Screw is characterized by its unique design, which includes a hexagonal socket and a flange head. The hexagonal socket allows for easy installation and removal using a hex key, while the flange head provides a larger bearing surface that distributes the load more evenly, reducing the risk of damage to the fastened material. In the automotive industry, these screws are commonly used in applications requiring strong, vibration-resistant fastening solutions ¹.

Purpose and Function

This Cummins part plays a significant role in the assembly and maintenance of truck components. It is used to secure various parts, ensuring they remain firmly in place under the demanding conditions of commercial truck operations. This screw helps maintain the structural integrity of the truck, contributing to overall safety and performance. Its design allows it to withstand high levels of stress and vibration, making it ideal for use in engines, transmissions, and other critical systems ².

Key Features

The 3412921 Hexagon Flange Head Cap Screw boasts several key features that enhance its performance and durability. It is typically made from high-strength materials such as alloy steel, which provides excellent resistance to wear and corrosion. The screw features a coarse thread type, which offers superior holding power and ease of installation. Additionally, the flange design of the head ensures that the load is distributed evenly, minimizing the risk of stripping or damaging the fastened material. These features collectively contribute to the screw’s reliability and longevity in heavy-duty applications ³.

Benefits

The 3412921 Hexagon Flange Head Cap Screw offers several benefits that make it a valuable component in commercial truck applications. Its design provides improved fastening security, ensuring that components remain securely in place even under extreme conditions. The ease of installation and removal using a hex key simplifies maintenance procedures, reducing downtime. Furthermore, the screw’s resistance to vibration and loosening ensures that it maintains a tight hold over time, enhancing the overall reliability of the truck’s components ⁴.

Troubleshooting and Maintenance

To ensure the longevity and reliable performance of the 3412921 Hexagon Flange Head Cap Screw, it is important to address common issues promptly. Regular inspection for signs of wear, corrosion, or damage is recommended. If a screw appears loose or damaged, it should be replaced to prevent further complications. Additionally, using the correct torque specifications during installation helps prevent over-tightening, which can lead to stripping or breakage. Proper maintenance practices, such as keeping the screw and surrounding areas clean and free of debris, also contribute to its longevity.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a rich history dating back to 1919, Cummins has established itself as a trusted name in the commercial vehicle industry. The company is renowned for its expertise in diesel engines and related technologies, consistently delivering high-quality, innovative solutions that meet the demanding needs of its customers. Cummins’ commitment to quality and innovation is evident in its wide range of products, including the 3412921 Hexagon Flange Head Cap Screw, which exemplifies the company’s dedication to excellence in the automotive and heavy-duty truck sectors.

Cummins Engine Compatibility with Part 3412921

The Hexagon Flange Head Cap Screw, part number 3412921, manufactured by Cummins, is a critical component used in various engine models. This part is integral to the assembly and maintenance of several Cummins engines, ensuring secure fastening and reliable performance. Below is a detailed description of how this part fits within different engine models:

ISX Series Engines

• ISX CM570
• ISX CM870
• ISX CM871
• ISX15 CM2250
• ISX15 CM2250 SN
• ISX15 CM2350 X101

The ISX series engines, including the CM570, CM870, CM871, CM2250, CM2250 SN, and CM2350 X101, utilize the Hexagon Flange Head Cap Screw for various applications. This screw is typically used in securing components such as valve covers, oil pans, and other critical assemblies, ensuring that these parts remain tightly fastened and properly aligned.

QSX Series Engines

• QSX15 CM2250
• QSX15 CM2250 ECF
• QSX15 CM2350 X105

In the QSX series engines, the Hexagon Flange Head Cap Screw is employed in similar roles as in the ISX series. These engines, including the CM2250, CM2250 ECF, and CM2350 X105, rely on this screw to maintain the integrity of their assemblies, ensuring that all parts are securely fastened and properly aligned.

Other Cummins Engines

• 6B5.9
• ISM CM876
• QSB5.9 44 CM550
• X12 CM2670 X121B
• X13 CM2670 X122B
• X15 CM2350 X116B
• X15 CM2350 X123B
• X15 CM2450 X134B

The Hexagon Flange Head Cap Screw is also used in other Cummins engines such as the 6B5.9, ISM CM876, QSB5.9 44 CM550, X12 CM2670 X121B, X13 CM2670 X122B, X15 CM2350 X116B, X15 CM2350 X123B, and X15 CM2450 X134B. In these engines, the screw is essential for securing various components, ensuring that the engine operates smoothly and efficiently.

Hexagon Flange Head Cap Screw (Part 3412921) Usage in Engine Systems

The Hexagon Flange Head Cap Screw, identified by part number 3412921, is integral to the assembly and operation of various engine components. Its design and functionality make it suitable for several applications within engine systems.

Alternator Mounting

In alternator mounting applications, the Hexagon Flange Head Cap Screw secures the alternator to the engine block or mounting bracket. This ensures the alternator remains firmly in place, allowing it to generate electricity efficiently without vibrations that could lead to performance issues or damage.

Cylinder Block

When used in the cylinder block, this screw plays a role in attaching various accessories and components to the block. It provides a strong and reliable connection, which is essential for the structural integrity of the engine. This includes securing items such as sensors, brackets, and other auxiliary components that are vital for the engine’s operation.

Front Gear Housing

In the front gear housing, the Hexagon Flange Head Cap Screw is employed to fasten the housing to the engine frame or other supporting structures. This connection is important for maintaining the alignment and stability of the gear housing, which is critical for the transmission of power from the engine to other parts of the vehicle.

Water Pump Drive

For the water pump drive, this screw is used to attach the water pump to the engine block or front cover. Ensuring a tight and secure fit is important for the proper functioning of the water pump, which circulates coolant through the engine to prevent overheating. A secure attachment helps maintain the efficiency of the cooling system and prevents leaks that could lead to engine damage.

Conclusion

The 3412921 Hexagon Flange Head Cap Screw by Cummins is a critical component in commercial truck applications, offering robust fastening solutions that ensure the integrity and reliability of truck components. Its unique design, key features, and benefits make it an essential part for heavy-duty applications, contributing to the overall safety and performance of the vehicle.