3900629
Hexagon Flange Head Cap Screw
Cummins®

This article provides an overview of the Hexagon Flange Head Cap Screw, part number 3900629, manufactured by Cummins. It covers the basic concepts, purpose, key features, benefits, and maintenance suggestions for this component, which is commonly used in commercial trucks.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of fastener characterized by a hexagonal head and a flanged base. The hexagonal head allows for easy tightening and loosening using a wrench or socket, while the flange provides additional surface area for load distribution and prevents the screw from being driven too far into the material ¹.

Purpose and Function

The 3900629 Hexagon Flange Head Cap Screw by Cummins is designed for use in commercial trucks. It plays a role in securing various components and assemblies within the truck’s structure. This screw is often used in applications where a combination of high tensile strength and resistance to loosening is required ².

Key Features

• Hexagonal head for easy tool engagement.
• Flanged base for load distribution and prevention of over-driving.
• Manufactured from high-strength materials to ensure durability under heavy loads.
• Designed for use in demanding commercial truck applications.

Benefits

• Provides secure fastening in high-stress applications.
• Offers resistance to loosening due to vibrations commonly experienced in truck operations.
• Enhances the structural integrity of truck components.
• Easy to install and remove using standard tools ³.

Troubleshooting and Maintenance

Regular inspection of Hexagon Flange Head Cap Screws is recommended to ensure they remain tight and have not corroded. If corrosion is detected, the affected screws should be replaced to maintain the integrity of the fastening. Additionally, using the correct torque specifications during installation helps prevent over-tightening or under-tightening, which can lead to screw failure or loosening over time ⁴.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. The company is known for its commitment to quality and innovation in the automotive and heavy-duty truck industries.

Hexagon Flange Head Cap Screw 3900629 in Cummins Engines

The Hexagon Flange Head Cap Screw 3900629, manufactured by Cummins, is a critical component in various Cummins engine models. This part is designed to secure different engine parts, ensuring structural integrity and operational efficiency. Below is a detailed breakdown of how this screw fits into specific Cummins engines:

15N CM2380 M104B

The 3900629 screw is utilized in the 15N CM2380 M104B engine for fastening various components, ensuring that parts remain tightly secured during operation.

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

In the 4B3.9, 6B5.9, and 6C8.3 engines, the screw is employed in several applications, including securing engine covers and other critical assemblies.

B3.3, B3.9 G, B4.5, B4.5 CM2350 B129B, B4.5 RGT, B5.6 CM2670 B152B, B5.9 CM2670 B166C, B5.9 G, B5.9 GAS PLUS CM556

The 3900629 screw is integral to the B3.3, B3.9 G, B4.5, B4.5 CM2350 B129B, B4.5 RGT, B5.6 CM2670 B152B, B5.9 CM2670 B166C, B5.9 G, and B5.9 GAS PLUS CM556 engines. It is used to fasten various engine components, ensuring that parts remain securely attached under operational stress.

B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, B6.7S, C GAS PLUS CM556

In the B6.7 CM2350 B135B, B6.7 CM2670 B153B, B6.7 CM2670 B164C, B6.7 G CMOH6.0 B125, B6.7S, and C GAS PLUS CM556 engines, the 3900629 screw is used for securing multiple engine parts, including covers and other structural components.

D4.0 CM2620 D103B, F2.8 CM2620 F135B, F3.8 CM2350 F120B, F3.8 CM2350 F128C, F3.8 CM2620 F137B

For the D4.0 CM2620 D103B, F2.8 CM2620 F135B, F3.8 CM2350 F120B, F3.8 CM2350 F128C, and F3.8 CM2620 F137B engines, the 3900629 screw is essential for fastening various engine components, ensuring that parts remain securely attached during operation.

Each of these engines relies on the 3900629 screw to maintain the structural integrity and operational efficiency of the engine components it secures.

Role of Part 3900629 Hexagon Flange Head Cap Screw in Engine Systems

The Part 3900629 Hexagon Flange Head Cap Screw is an essential fastening component utilized in various engine systems to ensure secure and reliable connections. Its application spans across multiple critical areas within the engine assembly, contributing to the overall integrity and functionality of the engine.

Access Hole Cover

In the access hole cover system, the Hexagon Flange Head Cap Screw is employed to fasten the cover securely in place. This ensures that the access points remain sealed and protected from contaminants, maintaining the engine’s operational efficiency.

Aftercooler Water Plumbing

For the aftercooler water plumbing, these screws are used to secure fittings and connections. This helps in maintaining the structural integrity of the plumbing system, ensuring consistent coolant flow and effective aftercooling of the compressed air.

Air Cleaner Mounting

The air cleaner mounting system utilizes these screws to attach the air cleaner housing to the engine block. This secure attachment is vital for preventing air leaks and ensuring that the air intake system functions correctly.

Alternator Mounting

In alternator mounting, the Hexagon Flange Head Cap Screws are critical for securing the alternator to the engine. This ensures stable operation of the alternator, which is essential for generating electrical power for the engine’s electrical systems.

Block and Short Block

Within the engine block and short block assemblies, these screws are used to fasten various components such as sensors, brackets, and other auxiliary parts. This helps in maintaining the structural stability of the engine block.

Bracket Actuator Mounting

For bracket actuator mounting, these screws provide the necessary tension and security to hold actuators in place. This is important for the precise operation of various engine controls and systems.

Charge Air Bypass Arrangement

In the charge air bypass arrangement, the screws are used to secure bypass valves and associated components. This ensures that the bypass system operates efficiently, managing the flow of charge air as required.

Compressor Air Inlet Arrangement

The compressor air inlet arrangement uses these screws to secure air inlet components. This is essential for maintaining a sealed and efficient air intake pathway to the compressor.

Compressor Coolant Arrangement

For the compressor coolant arrangement, these screws fasten coolant passages and fittings. This ensures that the coolant system remains intact, providing effective cooling to the compressor.

Engine Coolant Vent

In the engine coolant vent system, these screws are used to secure vent components. This helps in maintaining the integrity of the venting system, allowing for proper pressure release and coolant management.

Engine Instrument Panel

The engine instrument panel assembly utilizes these screws to secure gauges and sensors. This ensures that all instrumentation is firmly in place, providing accurate readings and data.

Exhaust Gas Temperature Sensor

For the exhaust gas temperature sensor, these screws are used to mount the sensor securely in the exhaust system. This ensures accurate temperature readings, which are crucial for engine management.

Exhaust Outlet Connection

In the exhaust outlet connection, these screws secure the exhaust components. This is important for maintaining a sealed exhaust system, ensuring efficient emission control and performance.

Fuel Filter and Fuel Filter Location

The fuel filter and its location within the engine system use these screws to secure the filter housing. This ensures that the fuel filter remains in place, providing clean fuel to the engine.

Fuel Filter Plumbing

For fuel filter plumbing, these screws are used to secure fuel lines and fittings. This ensures that the fuel delivery system remains intact, providing consistent fuel flow.

Fuel Pump

In the fuel pump assembly, these screws secure the pump to its mounting bracket. This is essential for the stable operation of the fuel pump, ensuring reliable fuel delivery.

Fuel Shutoff Valve Kit

The fuel shutoff valve kit uses these screws to secure the valve components. This ensures that the shutoff mechanism operates correctly, providing safe and controlled fuel management.

Rear Gear Train Accessory Drive

For the rear gear train accessory drive, these screws are used to secure drive components. This ensures that the accessory drive system operates smoothly, powering various engine accessories.

Throttle Control Bracket

In the throttle control bracket system, these screws secure the throttle control components. This is important for maintaining precise throttle control, which is essential for engine performance.

Turbocharger Plumbing

The turbocharger plumbing system utilizes these screws to secure turbocharger components and fittings. This ensures that the turbocharger system remains intact, providing efficient boost management.

Valve Cover Arrangement

Finally, in the valve cover arrangement, these screws are used to secure the valve cover to the engine block. This ensures that the valve cover remains sealed, protecting the valve train components from contaminants.

Conclusion

The 3900629 Hexagon Flange Head Cap Screw by Cummins is a versatile and robust component essential for maintaining the structural integrity and operational efficiency of various engine systems in commercial trucks. Its design features, such as the hexagonal head and flanged base, provide secure fastening and resistance to loosening, making it suitable for high-stress applications. Regular maintenance and proper installation techniques are crucial to ensure the longevity and reliability of this critical component.