3871379
Hexagon Jam 1/2-20 Nut
Cummins®

The Hexagon Jam 1/2-20 Nut, identified by part number 3871379, is a component manufactured by Cummins, a well-established name in the automotive industry. This part is significant in the realm of commercial truck maintenance due to its role in securing various components and ensuring the structural integrity of the vehicle.

Purpose and Function

This Cummins part serves a role in the operation of commercial trucks by fastening components securely. It is designed to lock onto a primary nut, preventing loosening due to vibration or other dynamic forces encountered during operation. This function is important for maintaining the integrity and safety of the truck’s components, ensuring they remain firmly in place under various driving conditions ¹.

Key Features

This part is characterized by its hexagonal shape, which allows for efficient tightening and loosening using standard wrenches. Its jam nut design includes a split or serrated underside that bites into the primary nut, enhancing the security of the fastening. The thread size of 1/2-20 indicates that it has a major diameter of 1/2 inch and 20 threads per inch, making it suitable for a wide range of applications within commercial trucks ².

Benefits

Using 3871379 offers several advantages. Its design provides enhanced security in fastening applications, significantly reducing the risk of loosening over time. The nut’s resistance to vibration-induced loosening ensures that critical components remain securely fastened, contributing to the overall durability and reliability of the truck. Additionally, its construction allows it to withstand the rigors of heavy-duty environments, making it a durable choice for commercial applications ³.

Installation and Usage

Proper installation of 3871379 is key to ensuring optimal performance. It should be installed by first securing the primary nut to the desired tightness, followed by the jam nut. Torque specifications should be adhered to, typically found in the vehicle’s maintenance manual or provided by the manufacturer, to ensure the nuts are tightened to the correct level without over-tightening, which could lead to damage. Regular checks should be performed to ensure the nuts remain secure, especially after the truck has been subjected to heavy use or harsh conditions ⁴.

Maintenance and Troubleshooting

Maintaining 3871379 involves regular inspection for signs of wear, corrosion, or damage. Common issues such as corrosion can be mitigated by applying a corrosion-resistant coating or lubricant during installation. If stripping occurs, it may be necessary to replace the nut to ensure the fastening remains secure. Troubleshooting should involve checking for proper torque and ensuring that the jam nut is correctly seated against the primary nut.

Compatibility and Applications

3871379 is commonly used in various applications within commercial trucks, including securing engine components, chassis parts, and other critical systems. Its versatility and reliability make it a preferred choice for fastening applications where vibration and dynamic loads are a concern.

Manufacturer - Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, related technologies, and complete power systems. With a strong reputation in the automotive industry, Cummins is committed to producing high-quality components that meet the demanding requirements of commercial and industrial applications. 3871379 is a testament to Cummins’ dedication to quality and reliability in the components it produces.

Conclusion

In summary, the Hexagon Jam 1/2-20 Nut (part number 3871379) plays a significant role in the maintenance and operation of commercial trucks. Its design and features ensure secure fastening of components, contributing to the vehicle’s durability and reliability. Proper installation, maintenance, and understanding of its applications are crucial for maximizing the benefits of this Cummins part.