3900626
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by Part #3900626, is a component manufactured by Cummins, a renowned name in the automotive industry. This screw is integral to the assembly and maintenance of commercial trucks, ensuring secure fastening in various applications. Cummins is recognized for its commitment to producing high-quality components that enhance the performance and reliability of commercial vehicles.

Basic Concepts

Hexagon Flange Head Cap Screws are designed with a hexagonal head and a flange that provides a larger bearing surface. This design allows for efficient torque application and reduces the risk of the screw head stripping during installation or removal. In the automotive industry, these screws are commonly used for fastening metal components, providing a secure and durable connection. Their design ensures that they can withstand significant stress and vibration, making them suitable for heavy-duty applications ¹.

Purpose and Role in Truck Operation

The 3900626 Hexagon Flange Head Cap Screw plays a specific role in the operation of commercial trucks by securing critical components in place. It is used in applications where a strong, vibration-resistant fastening solution is required. By providing a secure attachment, this screw contributes to the overall functionality and performance of the vehicle, ensuring that components remain firmly in place under various operating conditions ².

Key Features

The 3900626 Hexagon Flange Head Cap Screw features a hexagonal flange head, which offers several advantages. The hexagonal shape allows for easy installation and removal using standard tools, while the flange provides additional surface area to distribute the load and prevent the screw from digging into the material. The screw is made from high-quality materials, ensuring durability and resistance to corrosion. Its thread specifications are designed to provide a strong and secure fastening solution ³.

Benefits

The 3900626 Hexagon Flange Head Cap Screw offers several benefits. Its design enhances fastening strength, making it suitable for applications where high stress and vibration are present. The screw’s corrosion-resistant properties ensure longevity, even in harsh environments. Additionally, the ease of installation provided by the hexagonal head and flange design saves time and effort during maintenance and repair procedures.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion. Regular inspection and maintenance can help identify these issues early. To ensure optimal performance and longevity, it is recommended to check the screws periodically for signs of wear or corrosion. If any issues are detected, the affected screws should be replaced to maintain the integrity of the fastening.

Installation Procedures

Proper installation of the 3900626 Hexagon Flange Head Cap Screw is crucial for achieving secure fastening. Begin by ensuring the mating surfaces are clean and free of debris. Use the appropriate tool to install the screw, applying the specified torque to achieve the desired clamping force. It is important to follow torque specifications to avoid over-tightening, which can damage the screw or the material being fastened. Best practices include using a torque wrench for precise application and ensuring that the screw is installed perpendicular to the surface.

Safety Considerations

When working with Hexagon Flange Head Cap Screws, it is important to follow safety precautions to prevent accidents and ensure personal safety. Always wear appropriate personal protective equipment, such as gloves and safety glasses, to protect against injury. Use the correct tools for installation and removal to avoid damaging the screw or the surrounding components. Additionally, be mindful of the torque applied to prevent over-tightening, which can lead to stripped threads or component failure.

Cummins Overview

Cummins is a well-established manufacturer in the automotive industry, known for its high-quality components and engines. With a history of innovation and commitment to excellence, Cummins has built a reputation for producing reliable and durable parts for commercial vehicles. Their focus on quality and performance ensures that their components, including the 3900626 Hexagon Flange Head Cap Screw, meet the demanding requirements of heavy-duty applications.

Hexagon Flange Head Cap Screw 3900626 in Cummins Engines

The Cummins Hexagon Flange Head Cap Screw part number 3900626 is a critical component used in various Cummins engine models. This screw is designed to secure different parts within the engine, ensuring structural integrity and operational efficiency. Below is a detailed description of how this part fits into specific Cummins engines:

Engines Utilizing 3900626

• 15N CM2380 M104B
• 4B3.9
• 6B5.9
• 6C8.3
• B4.5
• B4.5 CM2350 B129B
• B5.6 CM2670 B152B
• 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 GAS PLUS CM556
• C8.3 G
• F2.8 CM2620 F135B
• F3.8 CM2620 F137B
• F4.5 CM2620 F139B
• G5.9
• G5.9 CM558
• G8.3
• G8.3 CM558
• GTA8.3 CM558

Application in Specific Engine Models

The 3900626 screw is used in several Cummins engines, often in applications where it secures critical engine components. Here’s a breakdown of its usage in specific engine models:

• 15N CM2380 M104B: This screw is used to secure the engine’s valve cover, ensuring a tight seal and preventing oil leaks.
• 4B3.9, 6B5.9, 6C8.3: These engines utilize the 3900626 screw for fastening various internal components, including the cylinder head and engine block.
• B4.5, B4.5 CM2350 B129B: The screw is employed to secure the turbocharger and other auxiliary components.
• B5.6 CM2670 B152B, B5.9 CM2670 B166C: These engines use the screw to fasten the intake manifold and other critical parts.
• B5.9 G, B5.9 GAS PLUS CM556: The screw is used in securing the engine’s exhaust manifold and other related parts.
• B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C: These engines use the screw for fastening the cylinder head and other internal components.
• B6.7 G CMOH6.0 B125, B6.7S: The screw is used to secure the fuel injection system and other critical parts.
• C GAS PLUS CM556: This engine uses the screw to fasten the engine’s turbocharger and other auxiliary components.
• C8.3 G: The screw is used for securing the engine’s valve cover and other related parts.
• F2.8 CM2620 F135B, F3.8 CM2620 F137B, F4.5 CM2620 F139B: These engines use the screw to fasten the engine’s intake manifold and other internal components.
• G5.9, G5.9 CM558, G8.3, G8.3 CM558, GTA8.3 CM558: These engines utilize the screw for securing the engine’s cylinder head and other critical parts.

This comprehensive application of the 3900626 screw across various Cummins engines highlights its importance in maintaining the structural integrity and operational efficiency of these engines.

Role of Part 3900626 Hexagon Flange Head Cap Screw in Engine Systems

The part 3900626 Hexagon Flange Head Cap Screw is instrumental in securing and maintaining the integrity of various engine components. Its robust design ensures reliable fastening in high-stress environments, making it a preferred choice for several critical applications.

Aftercooler Water Plumbing

In the aftercooler water plumbing system, the Hexagon Flange Head Cap Screw is used to secure fittings and connections. This ensures a leak-free system, maintaining efficient cooling of the compressed air before it enters the engine.

Air Intake Heater

For the air intake heater, this screw plays a role in attaching the heater elements and housing. Proper fastening is essential to ensure the heater operates within specified parameters, providing optimal air temperature for combustion.

Alternator Mounting

When mounting the alternator, the Hexagon Flange Head Cap Screw secures the alternator to the engine block or bracket. This ensures stable operation and prevents vibrations that could lead to electrical issues.

Brace and Harnesses

In brace and harness applications, these screws are used to fasten support structures and electrical harnesses. This maintains the structural integrity and proper alignment of components, ensuring reliable performance.

Brace Assembly Harness

Similarly, in brace assembly harnesses, the screw secures various brackets and supports, contributing to the overall stability and safety of the engine assembly.

Charge Air Cooler Kit

Within the charge air cooler kit, the screw is employed to attach the cooler to the engine and plumbing. This ensures efficient heat exchange and optimal air temperature for the combustion process.

Compressor Water Outlet Tube

The screw secures the compressor water outlet tube, ensuring a tight seal and preventing leaks. This is vital for maintaining the efficiency of the compressor and the overall engine performance.

Electronic Control Module Harness

In the electronic control module harness, the screw fastens the harness to the engine or chassis. This ensures secure and reliable electrical connections, which are critical for the engine’s electronic systems.

Fuel Control Module

For the fuel control module, the screw is used to attach the module to its mounting location. This ensures stable and secure operation, crucial for precise fuel delivery.

Fuel Filter

The screw secures the fuel filter in place, ensuring it remains firmly attached during engine operation. This is important for maintaining clean fuel supply and engine efficiency.

Fuel Shutoff Valve

In the fuel shutoff valve, the screw is used to attach the valve to its housing. This ensures reliable operation and prevents fuel leaks, enhancing safety and performance.

Fuel System Accessories

Various fuel system accessories, such as pumps and sensors, are secured using this screw. This ensures these components remain in place and function correctly.

Fuel Transfer Pump

The screw is used to mount the fuel transfer pump, ensuring it operates efficiently and reliably within the fuel system.

Hardware Kit

In hardware kits, the screw is a common component used for various fastening applications throughout the engine system.

Injector

For injectors, the screw secures the injector to the engine block or manifold. This ensures proper alignment and sealing, critical for fuel injection accuracy.

Lever and Throttle Adapter

The screw is used to attach levers and throttle adapters, ensuring these components operate smoothly and reliably.

Lubricating Oil Filter Head

Securing the lubricating oil filter head with this screw ensures a tight seal, preventing oil leaks and maintaining efficient filtration.

Manual Engine Control System

In manual engine control systems, the screw fastens various components, ensuring they remain securely in place during operation.

Mounting Transducer

The screw is used to mount transducers, ensuring they are correctly positioned for accurate readings and reliable performance.

Oil Pan

Securing the oil pan with this screw ensures it remains firmly attached, preventing oil leaks and maintaining engine lubrication.

Product Installation Package

In product installation packages, the screw is often included for various fastening needs during the installation process.

Throttle Lever

The screw secures the throttle lever, ensuring it operates smoothly and reliably, contributing to precise engine control.

Turbocharger

For turbochargers, the screw is used to attach the turbocharger to the engine, ensuring stable and secure operation.

Turbocharger Kit

In turbocharger kits, the screw is employed to fasten various components, ensuring the turbocharger system functions efficiently.

Water Inlet Connection

Finally, the screw secures the water inlet connection, ensuring a leak-free system and efficient water flow for engine cooling.

Conclusion

The 3900626 Hexagon Flange Head Cap Screw is a vital component in the maintenance and operation of Cummins engines. Its robust design and reliable performance make it suitable for a wide range of applications, ensuring the structural integrity and efficiency of various engine systems. Proper installation, regular maintenance, and adherence to safety guidelines are essential to maximize the benefits of this screw in heavy-duty applications.