S258
Heavy Hexagon Jam Nut
Cummins®

The Cummins S258 Heavy Hexagon Jam Nut is a specialized fastener designed for heavy-duty truck applications. Its primary function is to provide a secure fastening solution that resists loosening under vibration and stress, which are common in the demanding environments of heavy-duty trucks.

Basic Concepts of Heavy Hexagon Jam Nuts

Heavy hexagon jam nuts are a type of lock nut that features a hexagonal shape, allowing for easy tightening and loosening with standard tools. They are commonly used in mechanical assemblies to secure fasteners by creating a locking mechanism that prevents the nut from loosening over time. This is achieved through a serrated underside that digs into the mating surface when tightened, providing additional resistance to movement ⁴.

Purpose of the S258 Heavy Hexagon Jam Nut in Truck Operations

The S258 Heavy Hexagon Jam Nut plays a significant role in the operation and maintenance of heavy-duty trucks. It is applied in various truck components where secure fastening is required, such as in the engine, transmission, and chassis assemblies. By preventing fasteners from loosening, the S258 contributes to the overall reliability and safety of the vehicle ⁵.

Key Features of the S258 Heavy Hexagon Jam Nut

The S258 Heavy Hexagon Jam Nut is characterized by several distinctive features. Its hexagonal shape allows for efficient tightening and loosening. The nut is made from high-strength materials, ensuring durability under heavy loads. Design enhancements, such as a serrated underside, contribute to its performance by providing a locking mechanism that resists vibration and movement ¹.

Benefits of Using the S258 Heavy Hexagon Jam Nut

Using the S258 Heavy Hexagon Jam Nut offers several advantages. It provides improved fastening security, which is vital in applications where vibrations are common. The nut’s resistance to loosening ensures that fasteners remain tight, reducing the risk of component failure. Additionally, its durability in demanding environments contributes to the longevity of the fastening solution ².

Installation and Usage Guidelines

Proper installation of the S258 Heavy Hexagon Jam Nut involves several steps. First, ensure the mating surface is clean and free of debris. Use the appropriate tool to tighten the nut until the serrated underside engages with the surface. It is important to achieve the correct torque specification to ensure proper locking without over-tightening. Compatibility with other fasteners and components should be verified to ensure a secure fit ³.

Troubleshooting Common Issues

Frequent problems associated with heavy hexagon jam nuts include loosening and corrosion. If loosening occurs, re-tightening the nut to the specified torque may resolve the issue. In cases of corrosion, cleaning the mating surface and applying an anti-seize compound can prevent further corrosion and facilitate easier future adjustments ⁴.

Maintenance Tips

Regular maintenance practices can ensure the longevity and effectiveness of the S258 Heavy Hexagon Jam Nut. Inspection routines should include checking for signs of loosening or corrosion. If any issues are detected, appropriate adjustments or replacements should be made. Following manufacturer guidelines for torque specifications and maintenance intervals will help maintain the integrity of the fastening solution ⁵.

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 of innovation and commitment to quality, Cummins serves a wide range of industries, including automotive, construction, and agriculture. The company’s product range includes engines, powertrains, and related components, all designed to meet the demanding requirements of heavy-duty applications.

Cummins S258 Heavy Hexagon Jam Nut Compatibility

The Cummins S258 Heavy Hexagon Jam Nut is a critical component in the assembly and maintenance of various Cummins engines. This part is designed to provide a secure fastening solution, ensuring that bolts and screws remain tightly in place, even under the most demanding conditions.

Cummins K Series Engines

The S258 Heavy Hexagon Jam Nut is compatible with several models within the Cummins K Series, including:

• K19
• K38
• K50

These engines are known for their reliability and performance, often used in heavy-duty applications such as construction equipment and agricultural machinery.

Cummins M Series Engines

The M Series engines also benefit from the use of the S258 Heavy Hexagon Jam Nut. Compatible models include:

• M11 Celect Plus
• M11 Mechanical

These engines are designed for both on-highway and off-highway applications, providing robust power and efficiency.

Cummins N Series Engines

The N Series engines, specifically the N14 Mechanical, utilize the S258 Heavy Hexagon Jam Nut to ensure secure fastening in critical areas.

Cummins QSK Series Engines

The Cummins QSK Series engines, known for their high power output and efficiency, include the following models that are compatible with the S258 Heavy Hexagon Jam Nut:

• QSK19 CM500
• QSK19 CM850 MCRS
• QSK45 CM500
• QSK50 CM2150 K107
• QSK50 CM2150 MCRS
• QSK60 CM500
• QSK60 CM850 MCRS

These engines are widely used in marine, power generation, and heavy-duty transportation sectors.

Cummins L Series Engines

The L10 Mechanical engine is another model that incorporates the S258 Heavy Hexagon Jam Nut in its assembly.

Cummins V Series Engines

The V Series engines, including the V28 and V903, also utilize the S258 Heavy Hexagon Jam Nut for reliable fastening.

Cummins G Series Engines

The G855 engine, part of the G Series, is another application for the S258 Heavy Hexagon Jam Nut.

Cummins NH/NT Series Engines

The NH/NT 855 engine is another model that benefits from the use of the S258 Heavy Hexagon Jam Nut.

Cummins 6B/6C Series Engines

The 6B5.9 and 6C8.3 engines are also compatible with the S258 Heavy Hexagon Jam Nut, ensuring secure fastening in these high-performance engines.

Role of the S258 Heavy Hexagon Jam Nut in Engine Systems

The S258 Heavy Hexagon Jam Nut is an essential component in various engine systems, providing secure fastening and reliable performance across multiple applications. Here’s how it integrates with the provided components:

Actuator and Electrical Government Mounting

In systems where actuators are employed, such as in the electrical government mounting, the S258 nut ensures that electrical connections and mechanical linkages are firmly secured. This is vital for the precise operation of actuators, which rely on stable mounting to function correctly.

Engine Block and Cylinder NHS

When installed in the engine block or cylinder NHS, the S258 nut plays a role in maintaining the integrity of the engine’s structural components. It secures bolts that hold critical parts in place, ensuring that the engine block remains stable under operational stress.

Control and ETR Engine Systems

In control systems and ETR engines, the S258 nut is used to fasten components that regulate engine performance. This includes securing sensors, control modules, and other electronic components that require a robust mounting solution to withstand vibrations and thermal expansions.

Starting Systems

For the dual Delco-Remy 24V start and EBM system, the S258 nut is employed to secure starter motor mounts and electrical terminals. This ensures that the starting system components are reliably connected and can deliver consistent performance during engine start-up.

Electric System Kit and Engine Monitoring System

In an electric system kit and an engine monitoring system, the S258 nut is critical for fastening wiring harnesses, sensor mounts, and other electrical components. This ensures that the electrical systems remain secure and functional, providing accurate monitoring and control.

Fuel and Hydraulic Systems

In the fuel transfer mounting tank and hydraulic starter piping, the S258 nut secures fittings and connections that are essential for the safe and efficient transfer of fluids. This is particularly important in high-pressure systems where secure fastening prevents leaks and ensures system reliability.

Injector and Lubricating Systems

For the injector drain fitting and lubricating oil supply tube, the S258 nut ensures that these components are tightly secured. This is important for maintaining the integrity of fuel and lubricant delivery systems, which are essential for engine performance and longevity.

Battery and Exhaust Systems

In the mounting battery charger and exhaust outlet tube, the S258 nut provides a secure connection for electrical terminals and exhaust components. This ensures that the battery charging system operates efficiently and that exhaust gases are properly directed away from the engine.

Throttle Control and Performance Parts

For the multi-unit throttle control and various performance parts, the S258 nut secures throttle bodies, linkage components, and other performance-enhancing parts. This ensures that these systems operate smoothly and respond accurately to driver inputs.

Protective and Mounting Components

In systems such as the protective mounting guard, radiator guards and mounting, rock shield, and roll crusher kit, the S258 nut provides a strong and durable fastening solution. This is essential for protecting the engine and its components from external damage and ensuring that guards and shields remain in place under various operating conditions.

Fluid Transfer and Terminal Connections

For the shut-off valve kit, tank transfer, and terminal box bracket mounting, the S258 nut secures valves, transfer fittings, and terminal connections. This ensures that fluid transfer systems operate efficiently and that electrical connections remain secure and reliable.

Water Cooling System

In the water transfer tubes, the S258 nut secures fittings and connections that are vital for the engine’s cooling system. This ensures that coolant flows smoothly through the engine, maintaining optimal operating temperatures and preventing overheating.

Conclusion

The Cummins S258 Heavy Hexagon Jam Nut is a critical component in the maintenance and operation of heavy-duty engines. Its design ensures secure fastening across a variety of applications, contributing to the reliability and safety of heavy-duty trucks. Proper installation, regular maintenance, and adherence to manufacturer guidelines are essential for maximizing the performance and longevity of this Cummins part.