120688
Hexagon Head Cap Screw
Cummins®

The Cummins 120688 Hexagon Head Cap Screw is a specialized fastener designed for heavy-duty truck applications. It ensures components remain securely fastened under demanding conditions, contributing to the structural integrity and functionality of these vehicles.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw features a hexagonal head for easy tightening and loosening with a wrench or socket. These screws are favored in mechanical assemblies for their even distribution of clamping force, which maintains the integrity of joined parts. The hexagonal head provides a firm grip, reducing slippage during installation or removal ¹.

Purpose of the Cummins 120688 Hexagon Head Cap Screw

This Cummins part is utilized in various application areas within heavy-duty trucks, including engine mounts and chassis components. It is designed to withstand rigorous demands, ensuring critical components remain securely fastened ².

Key Features

The 120688 boasts several key features enhancing its performance and durability. These include a robust material composition, a specific thread type for a secure fit, and a head design facilitating easy installation and removal. Precision machining and heat treatment processes further enhance its strength and reliability ³.

Benefits

This part offers improved fastening strength, resistance to vibration loosening, and compatibility with various truck components, making it ideal for heavy-duty applications.

Installation and Usage Guidelines

Proper installation is crucial for a secure fastening. Guidelines recommend using a torque wrench to achieve specified torque settings, ensuring optimal clamping force without over-tightening. Cleaning mating surfaces is also recommended to remove debris or contaminants.

Troubleshooting and Maintenance

Common issues include loosening due to vibration and corrosion. Troubleshooting steps involve inspecting for wear or damage and reapplying appropriate torque. Maintenance tips include regular inspection for corrosion or wear and ensuring proper lubrication.

Safety Considerations

When working with this part, it is important to follow safety guidelines, including proper handling, storing in a dry location, using personal protective equipment, and ensuring a clean work area.

Cummins Overview

Cummins Inc. is a global power leader known for its quality and innovation in the automotive and heavy-duty truck industry. The company’s comprehensive range of truck components, including the 120688 Hexagon Head Cap Screw, is designed for reliable performance and durability in demanding applications.

Understanding the Role of Part 120688 Hexagon Head Cap Screw in Engine Systems

This part is integral to the assembly and secure functioning of various engine components across multiple systems. Its application ensures parts remain firmly in place under operational stress.

Alternator Systems

In alternator systems, this screw secures the alternator to its mounting bracket and maintains the structural integrity of the alternator’s attachment to the engine.

Base Parts and EBM: Pump

For base parts, this screw fastens base plates or frames supporting various engine components. In the context of the EBM, these screws mount the pump securely, ensuring efficient operation without vibrations.

Lube Oil and Lubricating Systems

In the lube oil system, this screw secures components such as filters, sensors, and housings. This is particularly important in the lubricating oil pump and lubricating pump mounting, where secure fastening ensures smooth and reliable operation.

Fan and Cooling Systems

For the fan bracket mounting and fan hub, these screws ensure that fan components are tightly secured, maintaining correct airflow through the engine, which is crucial for cooling and overall engine performance.

Oil Pump

In the oil pump system, this screw secures the pump housing and other related components, ensuring consistent and pressurized lubricant delivery, which is essential for engine longevity and performance.

Conclusion

The Cummins 120688 Hexagon Head Cap Screw is a versatile and essential component in the assembly and maintenance of heavy-duty truck engines. Its robust design and key features ensure secure fastening and reliable performance across various engine systems.