4026812
Studded Flange Cap Screw
Cummins®

The Studded Flange Cap Screw (Part #4026812) is a specialized fastener produced by Cummins, designed for use in heavy-duty commercial trucks. This article provides an overview of this Cummins part, its purpose, key features, benefits, and maintenance suggestions.

Basic Concepts

A Studded Flange Cap Screw is a type of fastener that includes a threaded stud with a flange at one end and a cap screw at the other. It is used to secure components that require a high degree of stability and resistance to vibration. The flange provides additional surface area for mounting, while the stud ensures a secure connection ¹.

Purpose and Function

The 4026812 Studded Flange Cap Screw plays a role in securing various components within a truck’s engine and chassis. It is commonly used in applications where high tensile strength and resistance to loosening are required. The screw helps maintain the integrity of critical connections, ensuring that components remain firmly in place under operating conditions ².

Key Features

• Studded Design: Provides enhanced holding power and resistance to vibration.
• Flange: Offers additional mounting surface area for improved stability.
• High Tensile Strength: Capable of withstanding significant loads and stresses.
• Corrosion Resistance: Often coated or made from materials that resist corrosion, ensuring longevity in various environments.
• Threaded Construction: Allows for easy installation and removal using standard tools.

Benefits

• Reliability: Ensures secure fastening in high-stress applications.
• Durability: Designed to withstand the rigors of heavy-duty truck operations.
• Ease of Use: Simple to install and remove, facilitating maintenance and repairs.
• Versatility: Suitable for a wide range of applications within the truck’s engine and chassis.

Troubleshooting and Maintenance

• Inspection: Regularly inspect the Studded Flange Cap Screw for signs of wear, corrosion, or damage.
• Tightening: Ensure that the screw is properly tightened to the manufacturer’s specifications to maintain secure connections.
• Replacement: Replace the screw if it shows signs of significant wear or damage to prevent failure.
• Lubrication: Apply an appropriate lubricant to the threads during installation to facilitate easier future removal and to reduce the risk of seizing ³.

Compatibility with Cummins Engines

The Studded Flange Cap Screw 4026812, manufactured by Cummins, is a critical component designed to secure flanges in various engine configurations. This part is integral to the assembly and maintenance of several Cummins engines, ensuring the integrity of the engine’s structure and the proper sealing of components.

Engine Families and Models

• 15N Series

  • 15N CM2380 M104B

• B5.6 Series

  • B5.6 CM2670 B152B

• D4.0 Series

  • D4.0 CM2620 D103B

• F4.5 Series

  • F4.5 CM2620 F139B

• ISL9 Series

  • ISL9 CM2150 SN

• ISX Series

  • ISX CM570
  • ISX CM870
  • ISX CM871
  • ISX12 CM2350 X102
  • ISX12 G CM2180 EJ
  • ISX12/ISX11.9 CM2250
  • ISX15 CM2250
  • ISX15 CM2250 SN
  • ISX15 CM2350 X101

• ISZ Series

  • ISZ13 CM2150 Z105

• L8.9G Series

  • L8.9G CMOH2.0 L125B

• QSC Series

  • QSC9 CM2250/QSL9 CM2250

• QSF Series

  • QSF2.8 CM2880 F105
  • QSF2.8 CM2880 F114

• QSL Series

  • QSL9 CM2250
  • QSL9 CM2350 L102

• QSM Series

  • QSM11 CM570

• QST Series

  • QST30 CM2350 T101

• QSX Series

  • QSX11.9 CM2250 ECF
  • QSX15 CM2250

This Cummins part is utilized across these diverse engine models to maintain the structural integrity of flange connections, ensuring that the engine components remain securely fastened and properly aligned. This screw is essential for the assembly and maintenance of these engines, contributing to their overall performance and longevity.

Role of Part 4026812 Studded Flange Cap Screw in Engine Systems

The part 4026812 Studded Flange Cap Screw is integral in securing and maintaining the integrity of various engine components. Its applications span across multiple systems, ensuring efficient operation and durability.

Air and Exhaust Systems

In the exhaust recirculation air arrangement, the Studded Flange Cap Screw secures connections, ensuring a sealed and efficient recirculation of exhaust gases. This helps in reducing emissions and improving engine performance. Similarly, in the air intake connection, it ensures a tight seal, preventing air leaks that could affect engine efficiency.

Turbocharger and Breather Systems

For the turbocharger, the screw is used in critical connections, maintaining the turbocharger’s efficiency by ensuring no air or exhaust leaks. In the breather and crankcase systems, it secures components, allowing for proper ventilation and pressure regulation within the engine.

Compressor and Refrigerant Systems

In compressor applications, the Studded Flange Cap Screw is vital for securing refrigerant lines and connections. This ensures the refrigerant system operates without leaks, maintaining the efficiency of the cooling process.

Cooling and Lubrication Systems

The screw plays a role in the cooler and engine oil systems by securing connections in the oil filter cooler and oil pan. This ensures consistent oil flow and pressure, which is essential for engine lubrication and cooling.

Fuel Systems

In the fuel pump drive and fuel control module, the screw secures critical components, ensuring the fuel system delivers consistent pressure and flow. This is essential for engine performance and reliability.

Structural and Accessory Mounting

The Studded Flange Cap Screw is also used in various mounting applications, such as the intake manifold, starting motor, and rear gear train accessory. These mountings are crucial for the structural integrity and proper functioning of these components.

Plumbing and Upfit Kits

In plumbing applications, such as the cabin heater and crankcase breather, the screw ensures secure connections, preventing leaks and maintaining system efficiency. In upfit kits, it is used to secure additional components, ensuring they are properly integrated into the engine system.

Additional Applications

The screw is also utilized in the air intake manifold, drive connections, and primer fuel system to secure and maintain the integrity of these components. This ensures the engine operates smoothly and efficiently.

Conclusion

The 4026812 Studded Flange Cap Screw is a critical component in the maintenance and operation of heavy-duty commercial trucks. Its robust design, high tensile strength, and corrosion resistance make it suitable for a wide range of applications within the engine and chassis. Regular inspection, proper tightening, and timely replacement are essential for ensuring the longevity and reliability of this part. By understanding its role and importance, technicians and operators can better maintain the integrity of their vehicles, leading to improved performance and durability.