3903112
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, Part #3903112 by Cummins, is a specialized fastener designed for use in commercial truck maintenance. Cummins, a renowned manufacturer in the automotive industry, produces this screw to meet the demanding requirements of heavy-duty applications. This screw is integral to ensuring the reliability and performance of commercial trucks, playing a significant role in various fastening applications across different truck components.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by its hexagonal head and flanged base. The hexagonal head allows for efficient torque application using standard tools, while the flange provides additional surface area to distribute load and prevent the screw from sinking into the material. This design ensures secure fastening and is particularly useful in applications where vibration and dynamic loads are common. The screw functions by threading into a pre-drilled hole, creating a strong and stable connection between components ¹.

Role in Truck Operation

The 3903112 Hexagon Flange Head Cap Screw plays a specific role in the operation and maintenance of commercial trucks. It is used in various applications, including securing engine components, attaching body panels, and fastening chassis parts. Its design ensures that critical components remain securely in place, even under the strenuous conditions encountered in commercial trucking. The screw’s ability to resist loosening due to vibration makes it ideal for these applications, contributing to the overall reliability and safety of the truck ².

Key Features

The 3903112 Hexagon Flange Head Cap Screw boasts several key features that enhance its performance in heavy-duty applications. Its hexagonal head design allows for easy and precise torque application, ensuring consistent fastening strength. The flange at the base of the screw provides additional stability and load distribution, preventing the screw from pulling through the material. Additionally, the screw is crafted from high-quality materials, offering excellent durability and resistance to corrosion, which is vital for withstanding the harsh environments often encountered in commercial trucking ³.

Benefits

The 3903112 Hexagon Flange Head Cap Screw offers several benefits that make it a preferred choice for commercial truck maintenance. Its design enhances fastening security, ensuring that components remain firmly in place under dynamic loads and vibrations. The flange characteristic provides added stability, reducing the risk of the screw pulling through the material. Furthermore, the screw’s material properties contribute to its durability, making it resistant to corrosion and capable of withstanding the rigors of heavy-duty applications ⁴.

Troubleshooting and Maintenance

To ensure the longevity and performance of the 3903112 Hexagon Flange Head Cap Screw, regular maintenance and troubleshooting practices are recommended. Inspecting the screw for signs of corrosion or damage can help identify potential issues before they lead to failure. If corrosion is detected, cleaning the affected area and applying a corrosion-resistant coating can help mitigate further damage. Additionally, ensuring that the screw is properly torqued during installation will help maintain its fastening strength and prevent loosening over time.

About Cummins

Cummins is a well-established manufacturer with a strong reputation in the automotive industry. Founded in 1919, Cummins has a long history of producing high-quality engine and power generation equipment. The company is known for its commitment to innovation, reliability, and customer satisfaction. Cummins’ extensive product line includes a variety of components designed to meet the needs of commercial trucking, construction, and other heavy-duty applications. Their dedication to producing durable and high-performance parts ensures that their products, like the 3903112 Hexagon Flange Head Cap Screw, are trusted by professionals in the industry.

Hexagon Flange Head Cap Screw (Part 3903112) in Cummins Engines

The Cummins Hexagon Flange Head Cap Screw, part number 3903112, is a critical component used in various Cummins engines. This part is integral in securing and maintaining the structural integrity of the engine’s components. Below is a detailed look at how this screw fits into different Cummins engines:

15N CM2380 M104B

The 15N CM2380 M104B engine utilizes the 3903112 screw to secure various components, ensuring that parts remain tightly fastened under operational stress.

4B3.9, 6B5.9, 6C8.3

These engines, including the 4B3.9, 6B5.9, and 6C8.3, incorporate the 3903112 screw in several key areas. This screw is essential for fastening components that are subject to high pressure and temperature, ensuring reliability and durability.

B4.5, B4.5 CM2350 B129B, B4.5 RGT

The B4.5 series, including variants like B4.5 CM2350 B129B and B4.5 RGT, use the 3903112 screw in multiple applications. This screw is crucial for maintaining the alignment and stability of engine parts, particularly in areas exposed to significant mechanical forces.

B5.6 CM2670 B152B, B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556

Engines such as B5.6 CM2670 B152B, B5.9 CM2670 B166C, B5.9 G, and B5.9 GAS PLUS CM556 rely on the 3903112 screw to secure various components. This screw is particularly important in areas where precise alignment and fastening are critical to engine performance and longevity.

B6.7 Series

The B6.7 series, including B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, and B6.7S, use the 3903112 screw extensively. This screw is vital for fastening components that experience high stress and thermal loads, ensuring the engine’s structural integrity is maintained.

C Series

The C series engines, such as C GAS PLUS CM556, incorporate the 3903112 screw in various applications. This screw is essential for securing parts that are critical to the engine’s operation and durability.

D4.0 CM2620 D103B

The D4.0 CM2620 D103B engine uses the 3903112 screw to secure components that are exposed to significant mechanical and thermal stresses, ensuring the engine’s reliability and performance.

F Series

The F series engines, including F2.8 CM2620 F135B, F3.8 CM2350 F120B, F3.8 CM2350 F128C, F3.8 CM2620 F137B, F3.8 F102, and F4.5 CM2620 F139B, utilize the 3903112 screw in multiple applications. This screw is crucial for maintaining the alignment and stability of engine parts, particularly in areas exposed to high pressure and temperature.

The 3903112 screw is a versatile and essential component in Cummins engines, ensuring that critical parts are securely fastened and aligned, contributing to the overall reliability and performance of the engine.

Hexagon Flange Head Cap Screw (Part 3903112) Component Usage

The Hexagon Flange Head Cap Screw, identified by part number 3903112, is a versatile fastener utilized in various engine systems to ensure secure and reliable connections. Its application spans across multiple components, contributing to the overall integrity and functionality of the engine.

Accumulator

In the accumulator system, the Hexagon Flange Head Cap Screw is employed to fasten the mounting brackets, ensuring the accumulator remains securely in place. This is essential for maintaining the structural stability of the accumulator, which is vital for its role in storing and regulating hydraulic pressure.

Air Intake Connection

For the air intake connection, this screw is used to secure the intake manifold to the engine block. A stable connection here is important for efficient airflow into the engine, directly influencing combustion efficiency and overall engine performance.

Air Shutdown Device

The air shutdown device, which controls the airflow to the engine in certain conditions, relies on the Hexagon Flange Head Cap Screw to attach its housing to the engine. This ensures that the device operates correctly without any risk of detachment.

Alternator Support

In alternator support systems, the screw is critical for attaching the alternator to its mounting bracket. This secure attachment is necessary for the alternator to function properly, providing the electrical power needed for the engine’s operation.

Auxiliary Cooling Vent

For the auxiliary cooling vent, the screw is used to fasten the vent housing, ensuring it remains in the correct position to facilitate effective cooling of engine components.

Charge Air Bypass Arrangement

In the charge air bypass arrangement, the screw secures the bypass valve, allowing for precise control over the airflow to the turbocharger, which is essential for optimal engine performance under varying conditions.

Compressor Mounting Parts

The compressor mounting parts utilize the Hexagon Flange Head Cap Screw to ensure the compressor is firmly attached to the engine. This is important for the compressor’s efficiency in compressing air for the engine’s intake system.

Engine Cooling System

Within the engine cooling system, the screw is used to secure components such as the thermostat housing and the oil filter cooler head. These connections are vital for maintaining the engine’s temperature within safe operating limits.

Exhaust Connection Bracket

For the exhaust connection bracket, the screw ensures a secure attachment of the exhaust manifold to the engine block, which is crucial for the efficient expulsion of exhaust gases.

Exhaust Outlet Connection

Similarly, at the exhaust outlet connection, the screw is used to fasten the exhaust pipe to the manifold, ensuring a tight seal to prevent exhaust leaks.

Front Gear Train Accessory Mounting

In front gear train accessory mounting, the screw secures accessories such as the alternator and power steering pump to the engine, ensuring they operate efficiently and without risk of detachment.

Fuel Plumbing

For fuel plumbing, the screw is utilized to secure fuel lines and fittings, ensuring a leak-free connection that is essential for safe and efficient fuel delivery to the engine.

Fuel Pump Lubrication Plumbing

In fuel pump lubrication plumbing, the screw ensures that lubrication lines are securely attached, which is important for the longevity and performance of the fuel pump.

Intercooler

The intercooler system uses the screw to secure the intercooler to its mounting brackets, ensuring it remains in the correct position for effective cooling of the compressed air before it enters the engine.

On Board Spares Kit and Repower Kit

These kits often include the Hexagon Flange Head Cap Screw for various applications, such as securing additional components or accessories that may be added during engine maintenance or upgrades.

Long Block

In the assembly of a long block, the screw is used to secure various components to the engine block, ensuring a stable and reliable engine structure.

Mounting Kit

The mounting kit utilizes the screw to secure various engine components to their respective mounts, ensuring they remain in place during engine operation.

Pressure Regulator Valve

For the pressure regulator valve, the screw is used to secure the valve housing, ensuring it operates correctly to regulate pressure within the engine system.

Service Kit

Service kits may include the Hexagon Flange Head Cap Screw for use in maintaining or repairing various engine components, ensuring they are securely fastened during and after service.

Thermostat Housing Plumbing

In thermostat housing plumbing, the screw secures the thermostat housing to the engine, which is essential for regulating the engine’s temperature.

Tube Kit

The tube kit uses the screw to secure tubing connections, ensuring a leak-free and stable system for fluid transfer within the engine.

Turbocharger

For turbocharger applications, the screw is used to secure the turbocharger to its mounting bracket, ensuring it operates efficiently to increase engine performance.

Wiring Retainer Bracket

Finally, the wiring retainer bracket utilizes the screw to secure wiring harnesses in place, ensuring they remain organized and protected within the engine compartment.

Conclusion

The 3903112 Hexagon Flange Head Cap Screw by Cummins is a critical component in the maintenance and operation of commercial trucks and various Cummins engines. Its unique design, featuring a hexagonal head and flanged base, ensures secure fastening and stability under dynamic loads and vibrations. The screw’s high-quality materials provide excellent durability and corrosion resistance, making it suitable for heavy-duty applications. Regular maintenance and proper installation practices are essential to ensure the screw’s longevity and performance. Cummins’ reputation for producing reliable and high-performance parts further underscores the trust professionals place in this essential fastener.