4991519
Regular Hexagon Nut
Cummins®

The 4991519 Regular Hexagon Nut, manufactured by Cummins, is a specialized fastener designed for use in commercial truck applications. Cummins, a well-established name in the industry, produces a range of high-quality components that contribute to the reliability and performance of commercial vehicles. This part plays a role in ensuring the secure assembly of various truck components, thereby contributing to the overall efficiency and safety of the vehicle ¹.

Basic Concepts of Regular Hexagon Nuts

A regular hexagon nut is a type of fastener characterized by its six-sided shape. This design allows for efficient tightening and loosening using standard hexagonal wrenches, which can engage with multiple sides of the nut simultaneously. The hexagonal shape provides several advantages over other nut shapes, including more consistent torque application and reduced likelihood of the wrench slipping off during use. This design is particularly beneficial in high-stress environments such as those found in commercial trucks ².

Purpose and Role in Truck Operation

The 4991519 Regular Hexagon Nut serves a specific purpose in the operation of commercial trucks. It is used to secure various components, ensuring that they remain firmly in place under the dynamic conditions experienced during truck operation. By providing a stable and reliable fastening solution, this nut contributes to the integrity of the truck’s structure and the safety of its operation. Its role is vital in maintaining the alignment and functionality of critical truck parts ³.

Key Features

The 4991519 Regular Hexagon Nut is distinguished by several key features that enhance its performance and durability. It is composed of high-strength materials, ensuring it can withstand the rigors of commercial truck use. The thread size is designed to match specific applications, providing a secure fit that resists loosening over time. Additionally, any unique design elements incorporated into this nut further contribute to its effectiveness in demanding environments.

Benefits

Using the 4991519 Regular Hexagon Nut offers several benefits. Its design allows for improved load distribution, which is crucial in applications where components are subject to significant stress. The nut’s resistance to loosening ensures that assemblies remain secure, reducing the risk of failure. Furthermore, its compatibility with standard hexagonal wrenches simplifies installation and maintenance, making it a practical choice for commercial truck applications.

Installation Guidelines

Proper installation of the 4991519 Regular Hexagon Nut is crucial for ensuring a secure fit. Begin by selecting the appropriate wrench size to match the nut’s hexagonal shape. Apply the nut to the corresponding bolt or stud, ensuring it is aligned correctly. Tighten the nut using a torque wrench, adhering to the specified torque settings to avoid over-tightening or under-tightening. Follow best practices for tightening, such as using a crisscross pattern for multi-bolt applications, to ensure even load distribution.

Troubleshooting and Maintenance

Common issues with regular hexagon nuts include loosening over time and damage from corrosion or wear. To troubleshoot these problems, regularly inspect nuts for signs of wear or corrosion and replace them as necessary. Maintenance tips include applying a thread locker to prevent loosening and ensuring that nuts are tightened to the correct torque specifications. These practices help prolong the life of the nut and ensure ongoing performance.

Cummins: Manufacturer Overview

Cummins Inc. is a leading manufacturer in the commercial truck industry, known for its wide range of high-quality components. With a history of innovation and excellence, Cummins has established a strong reputation for producing reliable and durable truck parts. The company’s commitment to quality and performance makes it a trusted source for truck components, including the 4991519 Regular Hexagon Nut.

Cummins Regular Hexagon Nut 4991519 Compatibility

The Cummins Regular Hexagon Nut 4991519 is a versatile component designed to fit a variety of Cummins engines. This part is engineered to meet the stringent requirements of Cummins’ diverse engine lineup, ensuring reliability and durability across different engine models.

Small Bore Engines

• 4B3.9
• 6B5.9
• 6C8.3
• L8.9
• L8.9 CM2670 L134C
• L9.5 L117

These engines, typically used in smaller applications, benefit from the precision and strength of the 4991519 nut. Its design ensures a secure fit, which is crucial for maintaining engine integrity and performance.

Medium Bore Engines

• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• ISBE CM2150
• ISBE CM800
• ISBE4 CM850
• ISL9 CM2150 SN
• ISL9.5 CM2880 L138
• ISZ13 CM2150 Z105
• QSB3.9 CM2880 B138
• QSB5.9 CM2880 B139
• QSB7 CM2880 B117
• QSL8.9 CM2150 L141
• QSL9 CM850 (CM2850)

This nut is also compatible with a range of medium bore engines, which are often found in commercial and industrial applications. The 4991519 nut’s robust construction ensures it can handle the increased stress and load these engines experience, providing a reliable fastening solution.

Specific Engine Models

• ISB/ISD4.5 CM2150 B119
• ISB/ISD6.7 CM2150 SN
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127
• ISBE CM2150
• ISBE CM800
• ISBE4 CM850
• ISL9 CM2150 SN
• ISL9.5 CM2880 L138
• ISZ13 CM2150 Z105
• QSB3.9 CM2880 B138
• QSB5.9 CM2880 B139
• QSB7 CM2880 B117
• QSL8.9 CM2150 L141
• QSL9 CM850 (CM2850)

These specific models benefit from the 4991519 nut’s precision fit, ensuring that all components are securely fastened and aligned, which is critical for engine performance and longevity.

Role of Part 4991519 Regular Hexagon Nut in Engine Systems

The 4991519 Regular Hexagon Nut is a fundamental component in the assembly and operation of various engine systems. Its primary function is to secure and maintain the integrity of connections across multiple engine components.

In the context of accessories and electric starting systems, the Regular Hexagon Nut is utilized to fasten components such as the manual throttle lever and coupling mechanisms. This ensures that these parts remain firmly in place, allowing for precise control and reliable operation of the engine’s starting system.

For the accessory support and connection points, the nut plays a vital role in securing the exhaust outlet and control units. This not only enhances the structural stability of these components but also ensures that they function efficiently without any risk of detachment.

In the fuel system, the Regular Hexagon Nut is employed in the fuel pump and fuel pump mounting processes. It secures the fuel pump to its designated location, ensuring a stable and leak-free connection that is essential for the consistent delivery of fuel to the engine.

The engine fan and fan assemblies also benefit from the use of this nut. It is instrumental in mounting the fan to the engine, guaranteeing that the cooling system operates effectively to maintain optimal engine temperature.

Furthermore, in the gauge and oil level monitoring systems, the nut is used to secure the oil level gauge and tube brace. This ensures accurate readings and maintains the structural integrity of the gauge assembly.

Lastly, during engine installation and mounting procedures, the Regular Hexagon Nut is crucial for securing various components in their designated locations. This includes fastening the engine to its mounting points and ensuring that all connected parts remain stable and operational throughout the engine’s lifecycle.

Conclusion

The 4991519 Regular Hexagon Nut is a critical component in the maintenance and operation of commercial trucks and various engine systems. Its design, compatibility with a wide range of Cummins engines, and the benefits it offers in terms of secure fastening and durability make it an essential part for ensuring the reliability and performance of commercial vehicles.