3901249
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, Part #3901249 by Cummins, is a specialized fastener designed for use in commercial truck applications. Cummins, a well-respected manufacturer in the industry, produces this screw to meet the demanding requirements of heavy-duty truck operations. This part is integral to ensuring the secure fastening of various components within these vehicles.

Basic Concepts

The Hexagon Flange Head Cap Screw is characterized by its hexagonal head and flange design. The hexagonal head allows for efficient torque application using standard tools, ensuring secure fastening ¹. The flange, a flat, circular plate at the head’s base, distributes the load more evenly across the surface, reducing the risk of damage to the fastened material. Within mechanical systems, this screw operates by providing a strong, vibration-resistant connection between components, which is vital for the integrity and performance of the truck ².

Role in Truck Operation

In the context of heavy-duty truck operations, the 3901249 Hexagon Flange Head Cap Screw serves multiple purposes. It is commonly used in applications where secure and durable fastening is required, such as in the attachment of engine components, chassis parts, and other critical assemblies. Its design ensures that it can withstand the high stresses and vibrations inherent in truck operations, maintaining a reliable connection over time ³.

Key Features

The primary features of the 3901249 Hexagon Flange Head Cap Screw include its hexagonal head design, which facilitates easy and precise torque application. The flange at the head’s base enhances load distribution, minimizing the risk of surface damage. Additionally, the screw is typically made from high-strength materials, such as alloy steel, to ensure durability and resistance to corrosion. These attributes contribute to the screw’s performance and longevity in demanding environments ¹.

Benefits

The 3901249 Hexagon Flange Head Cap Screw offers several advantages. Its design provides improved fastening security, making it less susceptible to loosening due to vibrations, which are common in truck operations. The flange also ensures enhanced load distribution, reducing the stress on the fastened material. These features collectively contribute to the overall reliability and performance of the truck’s components ².

Troubleshooting and Maintenance

Common issues associated with Hexagon Flange Head Cap Screws include corrosion and loosening due to vibrations. Regular inspection and maintenance are recommended to ensure optimal performance. This includes checking for signs of corrosion, ensuring proper torque settings during installation, and replacing screws that show signs of wear or damage. Adhering to these practices helps maintain the integrity of the fastening system and extends the lifespan of the screws ³.

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 has established a strong reputation in the commercial truck industry for producing high-quality, reliable components. Their product range includes engines, powertrain components, and aftermarket parts, all designed to meet the rigorous demands of heavy-duty applications.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw Part 3901249

The Cummins part 3901249, a Hexagon Flange Head Cap Screw, is designed to fit a variety of Cummins engines. This part is integral in securing various components within the engine assembly, ensuring structural integrity and operational efficiency. Below is a detailed breakdown of the engines that are compatible with this specific part.

B Series Engines

• B3.9
• B4.5
• B4.5 RGT
• B5.6 CM2670 B152B
• B5.9
• B5.9 CM2670 B166C
• B5.9 G
• B5.9 GAS PLUS CM556
• B6.7 CM2350 B135B
• B6.7 CM2670 B153B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125
• B6.7S

C Series Engines

• C GAS PLUS CM556

G Series Engines

• G5.9
• G5.9 CM558

F Series Engines

• F3.8 CM2350 F120B
• F3.8 CM2620 F137B
• F3.8 F102
• F4.5 CM2620 F139B
• F4.5 CM2620 F141C

D Series Engines

• D4.0 CM2620 D103B

4B and 6B Series Engines

• 4B3.9
• 6B5.9

C8 Series Engines

• C8.3 G

The Hexagon Flange Head Cap Screw part 3901249 is engineered to meet the stringent requirements of Cummins engines, ensuring reliable performance and durability. Its compatibility across a wide range of engine models underscores its versatility and importance in maintaining the structural integrity of these engines.

Role of Part 3901249 Hexagon Flange Head Cap Screw in Engine Systems

The Hexagon Flange Head Cap Screw (part 3901249) is instrumental in securing various components within engine systems, ensuring stability and efficient operation. Its application spans across multiple subsystems, each requiring precise fastening to maintain performance and safety.

Accessories and Electrical Components

In the realm of accessories and electrical components, the Hexagon Flange Head Cap Screw is used to mount sensors, gauges, and wiring harnesses. For instance, it secures the alternator wiring harness to the engine block, ensuring a stable electrical connection. Similarly, it fastens accessory support brackets, which hold various sensors and gauges in place, allowing for accurate engine monitoring.

Fuel System and Plumbing

Within the fuel system, this screw plays a significant role in attaching the fuel filter to its housing. It ensures that the filter remains securely in place, preventing any leaks or disruptions in the fuel supply. Additionally, it is used in the plumbing of the cylinder block and fuel supply lines, providing a tight seal that is essential for maintaining fuel pressure and flow.

Engine Instrumentation and Support Structures

For engine instrumentation, the screw is vital in mounting engine instrument panels and generator components. It ensures that these instruments are firmly attached, allowing for precise readings and reliable data collection. In terms of support structures, it secures the housing support mounting and rock shield support, contributing to the overall structural integrity of the engine.

Cooling and Exhaust Systems

In the cooling system, the Hexagon Flange Head Cap Screw is employed to fasten the radiator and aftercooler components. This ensures efficient heat dissipation and maintains the optimal operating temperature of the engine. In the exhaust system, it secures the muffler and other components, ensuring a secure fit that prevents exhaust leaks and reduces noise emissions.

Front and Rear Gear Train Accessories

The screw is also used in the front gear and rear gear train accessories, where it secures drive components and ensures smooth operation of the gear train. This is essential for transmitting power efficiently from the engine to the drivetrain.

Crankcase and Breather Systems

In the crankcase and breather systems, the Hexagon Flange Head Cap Screw is utilized to attach the cleaner air mounting and crankcase breather components. This helps in maintaining a clean crankcase environment and efficient ventilation, which is crucial for engine longevity.

Front Gear and Drive Components

Lastly, in the front gear and drive components, the screw ensures that all moving parts are securely fastened. This is important for maintaining the alignment and performance of the engine’s moving components.

Overall, the Hexagon Flange Head Cap Screw (part 3901249) is a versatile fastener that plays a key role in the assembly and operation of various engine systems, ensuring both stability and efficiency.

Conclusion

The 3901249 Hexagon Flange Head Cap Screw by Cummins is a critical component in the assembly and maintenance of heavy-duty truck engines. Its design, featuring a hexagonal head and flange, ensures secure and durable fastening across a wide range of applications. The screw’s compatibility with various Cummins engine models underscores its versatility and importance in maintaining the structural integrity and operational efficiency of these engines. Regular maintenance and proper installation practices are essential to ensure the longevity and reliability of this part.