108708
Hexagon Head Cap Screw
Cummins®

Introduction

The Hexagon Head Cap Screw Part #108708 by Cummins is a specialized fastener designed for use in commercial trucks. This screw plays a significant role in the maintenance and operation of trucks, ensuring that various components are securely fastened. Its design and material properties make it suitable for the demanding conditions encountered in commercial trucking environments.

Basic Concepts of Hexagon Head Cap Screws

A Hexagon Head Cap Screw is a type of fastener characterized by its hexagonal head, which allows for efficient torque application using standard tools such as wrenches or sockets. The screw’s design includes a threaded shaft that engages with internal threads in the mating part, providing a secure connection. Commonly made from materials like steel or stainless steel, these screws are chosen for their strength and durability. The thread pitch, which refers to the distance between threads, and the head shape are critical factors that influence the screw’s performance and ease of use ¹.

Purpose and Role in Truck Operation

The Hexagon Head Cap Screw Part #108708 is specifically designed for use in commercial trucks. It contributes to the assembly and maintenance of various truck components by providing a reliable fastening solution. This screw is often used in applications where high torque and resistance to loosening are required, such as in engine components, chassis parts, and other critical areas ².

Key Features

The Hexagon Head Cap Screw Part #108708 features a hexagonal head that allows for precise torque application using common tools. The screw has a specific thread type that ensures a strong and secure connection. Additionally, it may include special coatings or treatments to enhance its performance and durability, such as corrosion-resistant coatings to protect against environmental factors ³.

Benefits

Using the Hexagon Head Cap Screw Part #108708 offers several benefits. The hexagonal head design allows for improved torque application, ensuring that the screw can be tightened to the required specifications without slipping. The screw’s resistance to loosening helps maintain a secure connection over time, even under vibration and dynamic loads. Additionally, its compatibility with standard tools makes it easy to install and remove as needed.

Installation Guidelines

Proper installation of the Hexagon Head Cap Screw Part #108708 is crucial for ensuring a secure and lasting connection. Follow these guidelines for installation:

1. Select the appropriate screw size and length for the application.
2. Use a torque wrench to apply the recommended torque specifications, which can be found in the manufacturer’s guidelines.
3. Ensure that the mating surface is clean and free of debris to promote a strong connection.
4. Use the correct tool, such as a wrench or socket, to tighten the screw to the specified torque.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening over time and corrosion. To troubleshoot these issues:

1. Inspect the screw regularly for signs of wear or corrosion.
2. Re-tighten the screw if it has loosened, ensuring not to over-torque.
3. Replace the screw if it shows significant signs of wear or damage. Maintenance tips include keeping the screw and mating surface clean and applying a thread locker if necessary to prevent loosening.

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 quality, Cummins serves commercial, industrial, and automotive markets. The company is committed to providing reliable and efficient solutions that meet the needs of its customers in various industries.

Engines Utilizing the Hexagon Head Cap Screw (108708)

K-Series Engines

• K19
• K38
• K50

These engines, part of the K-Series, benefit from the robust fastening capabilities of the 108708 screw in their construction and maintenance.

QSK Engines

• QSK19 CM500
• QSK38 CM2150 MCRS
• QSK50 CM2150 K107
• QSK50 CM2150 MCRS
• QSK50 CM2350 K108

The QSK engines, known for their reliability and performance, incorporate the 108708 screw in their design, ensuring critical components are securely fastened.

N-Series Engines

• N14 G
• N14 MECHANICAL

The N-Series engines, including both the N14 G and N14 MECHANICAL variants, utilize the 108708 screw to maintain structural integrity and ensure proper alignment of various parts.

QSN Engine

• QSN14 CM876 N103

The QSN14 CM876 N103 engine relies on the 108708 screw for its assembly, providing the necessary strength and stability.

V-Series Engines

• V28
• V903

The V-Series engines, such as the V28 and V903, incorporate the 108708 screw to ensure that components are securely fastened, contributing to the overall reliability of the engine.

NH/NT Series Engine

• NH/NT 855

The NH/NT 855 engine uses the 108708 screw to maintain the integrity of its components, ensuring that the engine operates smoothly and efficiently.

KTA Series Engines

• KTA19GC
• KTA19GC CM558

The KTA19GC and KTA19GC CM558 engines both utilize the 108708 screw in their design, providing the necessary fastening for various parts.

G-Series Engines

• 6B5.9
• G855 CM558
• GTA38 G CMEICS G116C
• VTA903 CM2250 V105

The G-Series engines, including the 6B5.9, G855 CM558, GTA38 G CMEICS G116C, and VTA903 CM2250 V105, incorporate the 108708 screw to ensure that all components are securely fastened, contributing to the engine’s overall performance and durability.

Role of Part 108708 Hexagon Head Cap Screw in Various Engine Components

The Part 108708 Hexagon Head Cap Screw is a versatile fastener utilized across a wide array of engine components to ensure secure and reliable connections. Its application spans several key areas within engine systems, contributing to the overall integrity and functionality of the engine.

Air Cleaner Bracket Mounting

In the air cleaner system, the Hexagon Head Cap Screw is employed to mount the air cleaner bracket securely. This ensures that the air cleaner remains in place, allowing for efficient air filtration and smooth engine operation.

Alternator Mounting

For alternator mounting, the screw plays a significant role in attaching the alternator to the engine block or mounting bracket. This secure attachment is essential for the alternator’s stable operation, ensuring consistent power generation for the vehicle’s electrical systems.

Bracket and Pulley Mounting

When it comes to bracket and pulley mounting, the Hexagon Head Cap Screw is used to fasten brackets and pulleys to the engine. This secures the components in place, allowing for the proper functioning of belts and other driven accessories.

Cam Follower and Cam R.B. Cover

In the camshaft system, the screw is utilized in the mounting of cam followers and the cam R.B. cover. This ensures that the cam followers operate smoothly against the camshaft, and the cover remains securely in place to protect internal components.

Exhaust Connection and Manifold

For exhaust systems, the screw is crucial in connecting the exhaust manifold to the engine block and securing exhaust connections. This helps maintain a sealed exhaust path, reducing emissions and enhancing engine performance.

Expansion Tank

In cooling systems, the Hexagon Head Cap Screw is used to mount the expansion tank. This ensures that the tank remains securely attached, allowing for proper coolant management and pressure regulation within the system.

Fan Drive and Fan Drive Mtg.

The screw is also integral in the fan drive system, where it is used to secure the fan drive and its mounting. This ensures that the fan operates efficiently, providing adequate cooling for the engine.

Flywheel Mounting Housing and Flywheel

In the flywheel system, the screw is used to attach the flywheel mounting housing and secure the flywheel itself. This is vital for the transmission of power from the engine to the drivetrain, ensuring smooth and reliable operation.

Housing and Freon Compressor Kit

For refrigeration systems, the screw is used in the housing of the freon compressor kit. This secures the compressor in place, ensuring efficient operation and reliable cooling performance.

Fuel Reservoir and Fuel Transfer Kit

In fuel systems, the screw is employed to mount the fuel reservoir and components of the fuel transfer kit. This ensures that fuel is stored and transferred securely, maintaining the integrity of the fuel supply.

Fuel Transfer Pump

The screw is also used in the mounting of the fuel transfer pump, ensuring that it remains securely attached and operates efficiently to transfer fuel as needed.

Gear Cover Mounting

For gear systems, the screw is utilized in mounting the gear cover. This secures the cover in place, protecting internal gear components and ensuring smooth operation.

Guard Damper Mounting

In damper systems, the screw is used to mount the guard damper, ensuring that it remains in place to absorb vibrations and provide a stable operating environment for the engine.

Housing Flywheel

Similar to its use in the flywheel system, the screw is also employed in the housing of the flywheel, ensuring that it remains securely attached and functions correctly.

Idler Arm Absorber

For suspension systems, the screw is used in the mounting of the idler arm absorber. This ensures that the absorber remains securely attached, contributing to the stability and handling of the vehicle.

Marine Gear

In marine applications, the screw is used in the assembly and mounting of marine gear, ensuring that all components remain securely in place for reliable operation in aquatic environments.

Refrigerant Compressor and Refrigerant Compressor Bracket

For refrigerant systems, the screw is utilized in the mounting of the refrigerant compressor and its bracket. This ensures that the compressor operates efficiently and remains securely in place.

Shipping Skid

During transportation, the screw is used in the assembly of the shipping skid, ensuring that all components are securely fastened for safe and damage-free transport.

Turbocharger Arrangement

In turbocharged engines, the screw is used in the arrangement and mounting of turbocharger components. This ensures that the turbocharger remains securely attached, allowing for efficient boosting and enhanced engine performance.

Conclusion

The Hexagon Head Cap Screw Part #108708 by Cummins is a critical component in the assembly and maintenance of commercial trucks and various engine models. Its robust design, material properties, and versatile applications make it an essential fastener for ensuring secure and reliable connections in demanding environments. Proper installation, regular maintenance, and timely replacement are key to maximizing the performance and longevity of this Cummins part.