206881
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw, identified by part number 206881, is a specialized fastener produced by Cummins, a leading manufacturer in the automotive and heavy-duty truck industry. This screw is integral to heavy-duty truck applications, providing secure fastening and contributing to the overall structural integrity of the vehicle.

Basic Concepts of Twelve Point Cap Screws

A Twelve Point Cap Screw is a type of fastener that features a twelve-sided head, as opposed to the six-sided head of standard hex cap screws. This design allows for a greater contact area between the screw and the driving tool, which can enhance torque application and reduce the risk of cam-out ¹. In the automotive industry, twelve point cap screws are commonly used in applications where high torque and secure fastening are required.

Purpose and Role in Truck Operation

The 206881 Twelve Point Cap Screw plays a specific role in heavy-duty trucks by securing various components and contributing to the structural integrity of the vehicle. It is designed to withstand significant stress and vibration, ensuring that critical parts remain firmly in place under demanding conditions ³.

Key Features

The 206881 Twelve Point Cap Screw is characterized by its twelve-sided head, which provides a larger contact area compared to standard hex cap screws. It is typically made from high-strength materials, such as alloy steel, to ensure durability and resistance to wear. The screw’s design also includes features that enhance its performance in truck applications, such as a precise thread pitch and a robust construction ⁴.

Benefits

Using a Twelve Point Cap Screw offers several advantages. The increased contact area between the screw and the driving tool allows for improved torque application, reducing the likelihood of cam-out during installation. This design also enhances fastening security, ensuring that components remain securely attached even under significant stress and vibration ¹.

Installation Considerations

Proper installation of the 206881 Twelve Point Cap Screw is crucial to ensure optimal performance. It is important to follow torque specifications provided by the manufacturer to avoid over-tightening, which can lead to damage, or under-tightening, which can compromise fastening security. Best practices include using the correct driving tool and ensuring that the screw is installed in a clean, undamaged thread ².

Troubleshooting and Maintenance

Common issues with Twelve Point Cap Screws can include loosening due to vibration or corrosion. Regular inspection and maintenance can help identify and address these issues before they lead to more significant problems. If a screw appears loose, it should be re-tightened to the specified torque. In cases of corrosion, the affected area should be cleaned, and the screw may need to be replaced if damage is severe ³.

Compatibility and Applications

The 206881 Twelve Point Cap Screw is typically used in various applications within heavy-duty trucks, including securing engine components, transmission parts, and chassis elements. It is important to ensure compatibility with other components to maintain the integrity of the fastening system ⁴.

Cummins: A Brief Overview

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 reputation for quality, reliability, and innovation in the automotive and heavy-duty truck industry. The company’s product range includes engines, powertrain components, and aftermarket parts, all designed to meet the demanding requirements of modern transportation.

Twelve Point Cap Screw 206881 in Cummins Engines

The Twelve Point Cap Screw 206881, manufactured by Cummins, is a critical component in several of their engine models. This screw is integral to the assembly and maintenance of these engines, ensuring structural integrity and proper function.

K19 Series

The K19 engine series incorporates the Twelve Point Cap Screw 206881 in various applications. This screw is used to secure components within the engine, maintaining alignment and stability during operation.

KTA19GC Series

In the KTA19GC engines, the Twelve Point Cap Screw 206881 is utilized in both standard and CM558 configurations. This screw is essential for fastening parts that require high torque and precision, ensuring the engine’s components remain tightly secured under operational stresses.

QSK19 Series

The QSK19 engines, including models CM2350 K105, CM500, CM850 MCRS, and the QSK19G, all feature the Twelve Point Cap Screw 206881. This screw is used in multiple locations throughout these engines, from securing the cylinder heads to fastening other critical components. Its design allows for effective load distribution and ease of assembly.

Each of these engines relies on the Twelve Point Cap Screw 206881 for its robust and reliable performance, highlighting the importance of this component in Cummins’ engine design.

Role of Part 206881 Twelve Point Cap Screw in Engine Systems

The Part 206881 Twelve Point Cap Screw is instrumental in securing various components within engine systems, ensuring stability and efficient operation. Its application spans across several key areas:

• Damper and Pulley Mounting: This screw is utilized to firmly attach dampers and pulleys, which are essential for maintaining the balance and smooth operation of the engine. Proper mounting is necessary to prevent excessive vibrations and ensure the longevity of these components.

• Damper Mounting: In scenarios where dampers are individually mounted, the Twelve Point Cap Screw provides the necessary tension to keep the damper in place, absorbing vibrations effectively and protecting other engine parts from wear and tear.

• Kit 3-Groove Crank Pulley: When assembling a 3-groove crank pulley kit, these screws play a role in securing the pulley to the crankshaft, ensuring that the pulley operates within the designed parameters and contributes to the engine’s overall efficiency.

• Kit 4-14 Inch #1 Clutch Housing: For clutch housing assemblies, the screw is employed to fasten the housing securely, which is vital for the transmission of power from the engine to the drivetrain without slippage or failure.

• Mounting Damper and Pulley: In applications where both dampers and pulleys are mounted together, the Twelve Point Cap Screw ensures a tight and secure fit, which is essential for the synchronized operation of these components.

• Mounting Damper Vibration: Specifically designed to address vibration issues, these screws are used in mounting arrangements where minimizing vibration is paramount to engine performance and durability.

• Mounting Vibration Damper: Similar to the above, these screws are critical in vibration damper setups, where they help in absorbing and dissipating vibrations, thus protecting sensitive engine components.

• Mtg. Vibration Damper: In general mounting applications involving vibration dampers, the screw ensures that the damper is correctly positioned and tensioned, contributing to a stable engine operation.

• Vibration Damper Arrangement: Within complex vibration damper arrangements, these screws are used to secure multiple components, ensuring that the damper system functions as a cohesive unit to mitigate engine vibrations.

• Vibration Damper Magtronic: In magtronic systems, where magnetic properties are utilized to enhance damping effects, the screw ensures that all components are securely fastened, allowing the system to operate efficiently.

Overall, the Part 206881 Twelve Point Cap Screw is a versatile fastener that enhances the reliability and performance of engine systems by securely mounting and tensioning various components.

Conclusion

The 206881 Twelve Point Cap Screw is a critical component in heavy-duty truck and engine applications, providing secure fastening and contributing to the structural integrity of the vehicle. Its unique design, high-strength materials, and precise engineering make it an essential part in Cummins’ engine models, ensuring reliable performance and durability under demanding conditions.