70896
Hexagon Head Cap Screw
Cummins®

The Cummins 70896 Hexagon Head Cap Screw is a specialized fastener designed for use in commercial trucks. Cummins, a well-established name in the commercial truck industry, produces a range of high-quality components, including this hexagon head cap screw. This screw is integral to various fastening applications within commercial trucks, ensuring secure and reliable connections across different truck components.

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 tightening and loosening using a wrench or socket. These screws are commonly used in applications requiring strong, permanent fastening. Mechanically, the hexagon head design provides a larger surface area for tool engagement, reducing the risk of cam-out and ensuring consistent torque application. The threaded shaft of the screw engages with the internal threads of a nut or directly into a tapped hole, creating a secure connection ¹.

Purpose and Role in Truck Operation

The 70896 Hexagon Head Cap Screw plays a significant role in the operation of commercial trucks by ensuring structural integrity and secure fastening in various components. It is used in applications where high tensile strength and resistance to vibration are required. By providing a robust connection, this screw helps maintain the alignment and stability of truck parts, contributing to the overall safety and performance of the vehicle ².

Key Features

The 70896 Hexagon Head Cap Screw boasts several key features that enhance its performance and reliability in heavy-duty applications. It is typically made from high-strength alloy steel, offering superior durability and resistance to wear. The screw features a coarse thread, which provides excellent holding power and ease of installation. The hexagonal head design allows for efficient torque application, while the cap at the end of the screw covers the hole, preventing debris from entering and causing corrosion. Additionally, the screw may be coated with a protective finish to further enhance its resistance to environmental factors ³.

Benefits

Using the 70896 Hexagon Head Cap Screw offers several benefits. Its high-strength material composition ensures improved durability, making it suitable for heavy-duty applications. The protective coating enhances resistance to corrosion, prolonging the screw’s lifespan even in harsh environments. The design of the screw allows for ease of installation, reducing the time and effort required during maintenance. Furthermore, the secure fastening provided by the screw contributes to the overall reliability and performance of the truck ⁴.

Installation Guidelines

Proper installation of the 70896 Hexagon Head Cap Screw is vital to ensure optimal performance and longevity. Begin by selecting the appropriate hole size and ensuring it is clean and free of debris. Use a tap to create internal threads if necessary. When installing the screw, use a torque wrench to apply the recommended torque specification, which ensures the screw is tightened to the correct level without over-tightening. Employ the correct tools, such as a socket or wrench, to engage with the hexagonal head for consistent torque application. Follow best practices by periodically checking the tightness of the screw during initial use to prevent loosening due to settling ⁵.

Troubleshooting and Maintenance

Common issues with Hexagon Head Cap Screws include loosening due to vibration, corrosion, and wear. To troubleshoot, first, ensure the screw is properly torqued. If loosening occurs, re-tighten the screw to the specified torque. For corrosion, clean the screw and surrounding area, and consider applying a corrosion-resistant coating. Regular maintenance involves inspecting the screw for signs of wear or damage and replacing it if necessary. Keeping the screw and its environment clean will help prevent corrosion and extend its lifespan ⁶.

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 spanning over a century, Cummins has established a strong reputation for quality and innovation in the commercial truck industry. The company’s product range includes engines, powertrains, and components, all designed to meet the demanding requirements of heavy-duty applications. Cummins is committed to delivering reliable, high-performance products that contribute to the efficiency and safety of commercial vehicles ⁷.

Hexagon Head Cap Screw 70896 in Cummins Engines

The Cummins Hexagon Head Cap Screw part number 70896 is a critical component in various Cummins engine models. This screw is integral in securing different parts and assemblies within the engine, ensuring structural integrity and operational efficiency. Here’s how it fits into specific engine models:

6C8.3 and C8.3 G Engines

In the 6C8.3 and C8.3 G engines, the 70896 screw is used to fasten components that require precise alignment and secure fastening. These engines, known for their reliability and performance, benefit from the screw’s ability to maintain tight tolerances and resist loosening under operational stresses.

G855 and G855 CM558 Engines

For the G855 and G855 CM558 engines, the 70896 screw plays a vital role in securing various engine components, including those in the cylinder head and block assemblies. Its design ensures that these parts remain firmly in place, contributing to the engine’s overall durability and efficiency.

GTA855 CM558 (CM2358) G101 and KTA19GC CM558 Engines

In the more advanced GTA855 CM558 (CM2358) G101 and KTA19GC CM558 engines, the 70896 screw is used in high-stress areas where reliability is paramount. These engines, often used in heavy-duty applications, rely on the screw’s strength and precision to maintain the integrity of critical assemblies.

N14 G and N14 MECHANICAL Engines

The N14 G and N14 MECHANICAL engines also utilize the 70896 screw in several key locations. This includes securing components in the engine block and other critical assemblies. The screw’s design ensures that these parts remain securely fastened, contributing to the engine’s longevity and performance.

NH/NT 855 Engines

In the NH/NT 855 engines, the 70896 screw is used in various applications where precise fastening is required. This includes securing components in the engine’s head and block, ensuring that these parts remain in optimal alignment and position.

QSK19 CM850 MCRS and QSK60 CM850 MCRS Engines

For the QSK19 CM850 MCRS and QSK60 CM850 MCRS engines, the 70896 screw is employed in high-stress environments. Its use in securing critical components helps maintain the engine’s structural integrity and performance, especially in demanding applications.

QSKNT14 CM876 N102 and V28 Engines

In the QSKNT14 CM876 N102 and V28 engines, the 70896 screw is used to fasten various components, ensuring that they remain securely in place. This is particularly important in these engines, where precise assembly and alignment are crucial for optimal performance and reliability.

The consistent use of the 70896 Hexagon Head Cap Screw across these diverse engine models underscores its importance in maintaining the structural integrity and operational efficiency of Cummins engines ⁸.

Role of Part 70896 Hexagon Head Cap Screw in Engine Systems

Part 70896, the Hexagon Head Cap Screw, is integral to the assembly and functionality of various engine components. Its robust design ensures secure fastening, which is essential for the reliable operation of the engine system.

Accessories and Electrical Components

In accessories and electrical components, the Hexagon Head Cap Screw is used to secure wiring harnesses and electrical connections. This ensures that all electrical components are firmly in place, reducing the risk of disconnections or shorts that could affect engine performance.

Aftercooler and Breather Systems

For the aftercooler and breather systems, the screw plays a role in attaching the breather vent tube and corrosion resistor brackets. This secures the breather system, which is vital for maintaining proper pressure and preventing moisture buildup within the engine.

Drive and Fan Components

In drive and fan components, the Hexagon Head Cap Screw is employed in the fan arrangement and fan assembly hub. It ensures that the fan drive ratios (.75 to 1 and .86 to 1) are maintained correctly, which is important for efficient cooling of the engine.

Exhaust Manifold and Mounting

The screw is also critical in the exhaust manifold mounting, where it helps to secure the manifold to the engine block. This ensures that the exhaust system operates efficiently without leaks.

Harness and Wiring

In harness and wiring applications, the screw is used to fasten wiring harnesses in place. This is essential for maintaining the integrity of the electrical system and ensuring that all connections remain secure under engine vibrations.

Housing and Thermostat

For housing and thermostat components, the Hexagon Head Cap Screw secures the thermostat housing. This is important for maintaining the correct temperature within the engine, ensuring optimal performance and longevity.

Alternator and Pump Drives

In the alternator and pump drives, the screw is used to attach the alternator and rear hydraulic pump drive. This ensures that these components are securely fastened, allowing them to operate efficiently without risk of detachment.

Resistor and Corrosion Components

The screw is also utilized in corrosion resistor brackets and reverse gear hose spacers. This helps in maintaining the structural integrity of these components, which are essential for the overall durability of the engine system.

Throttle Linkage and Turbocharger

In throttle linkage and turbocharger applications, the Hexagon Head Cap Screw secures these components in place. This is vital for ensuring that the throttle responds accurately and that the turbocharger operates within its designed parameters.

Water Inlet Connections

Finally, in water inlet and water inlet connections, the screw is used to secure these components. This ensures that the cooling system maintains proper water flow, which is essential for engine temperature regulation ⁹.

Conclusion

The Cummins 70896 Hexagon Head Cap Screw is a critical component in the assembly and operation of commercial truck engines. Its robust design, high-strength material, and secure fastening capabilities ensure the structural integrity and reliable performance of various engine components. Proper installation and maintenance of this screw are essential for the longevity and efficiency of the engine system.