3919951
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3919951, is a specialized fastener produced by Cummins, a renowned manufacturer in the automotive and heavy-duty truck industry. This screw is significant in heavy-duty trucks due to its robust design and reliable performance, which contribute to the secure fastening of various components within the vehicle.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by its hexagonal head and a flange beneath the head. This design allows for efficient torque application and provides a larger bearing surface, which helps distribute load more evenly ¹. In fastening applications, these screws are used to join components securely, ensuring structural integrity and stability within mechanical systems.

Purpose and Role in Truck Operation

This Cummins part plays a specific role in heavy-duty trucks by securing critical components that are subject to significant stress and vibration. Its design ensures that parts remain firmly attached, which is vital for the safe and efficient operation of the truck. This screw is often used in applications where high torque is required, and where the fastener must resist loosening over time.

Key Features

The 3919951 features a hexagonal head that allows for easy and precise tightening using standard tools. The flange beneath the head provides additional surface area, which enhances the screw’s ability to distribute load and resist rotation. Made from high-quality materials, this screw is designed to withstand harsh environments, including exposure to chemicals, moisture, and extreme temperatures, ensuring long-lasting performance.

Benefits

Using the 3919951 offers several advantages. Its hexagonal head design allows for improved torque application, ensuring that components are securely fastened. The flange feature provides resistance to loosening, which is particularly important in applications subject to vibration. Additionally, the screw’s durable material properties ensure it can withstand the rigors of heavy-duty truck operation, contributing to the overall reliability and longevity of the vehicle.

Installation and Usage Guidelines

Proper installation of the 3919951 is crucial for ensuring secure fastening. Begin by aligning the screw with the designated hole in the component. Use a torque wrench to tighten the screw to the manufacturer’s specified torque settings, which ensures that the fastener is neither over-tightened nor under-tightened. It is also important to follow best practices, such as lubricating the screw threads to reduce friction and prevent galling ².

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion in harsh environments. To address these issues, regular inspections should be conducted to ensure that screws remain tight and show no signs of corrosion. If loosening is detected, re-tighten the screw to the specified torque settings. In cases of corrosion, the affected screw should be replaced to maintain the integrity of the fastening.

Cummins: Manufacturer 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 producing high-quality components that meet the demanding requirements of the automotive and heavy-duty truck industries. The company’s commitment to innovation, quality, and customer satisfaction makes it a trusted source for truck components, including the 3919951.

Hexagon Flange Head Cap Screw (Part 3919951) in Cummins Engines

The Hexagon Flange Head Cap Screw, identified by the part number 3919951, is a critical component in various Cummins engine models. This screw is integral to the assembly and maintenance of several engine types, ensuring secure fastening and structural integrity.

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

The ISC series engines, including the CM2150, CM554, CM850, and 8.3 CM2250 variants, utilize the 3919951 screw in various applications. This screw is often employed in securing components within the engine’s framework, ensuring that parts remain tightly fastened and aligned during operation.

ISL9 Series Engines

• ISL9 CM2150 SN

The ISL9 CM2150 SN engine incorporates the 3919951 screw in its design. This screw is used in critical areas where high strength and durability are required, such as in the engine’s head or other structural components.

QSC Series Engines

• QSC8.3 CM554
• QSC8.3 CM850 (CM2850)
• QSC9 CM2250 / QSL9 CM2250

The QSC series engines, including the QSC8.3 CM554, QSC8.3 CM850 (CM2850), QSC9 CM2250, and QSL9 CM2250, also rely on the 3919951 screw. This screw is used in various applications within these engines, ensuring that components are securely fastened and that the engine maintains its structural integrity.

QSL9 Series Engines

• QSL9 CM850 (CM2850)

The QSL9 CM850 (CM2850) engine uses the 3919951 screw in several key areas. This screw is essential for maintaining the alignment and security of various engine components, ensuring the engine operates efficiently and reliably.

The use of the 3919951 across these Cummins engine models underscores its importance in maintaining the structural integrity and performance of the engines. This screw is designed to withstand the rigors of engine operation, providing a reliable fastening solution in critical applications.

Role of Part 3919951 Hexagon Flange Head Cap Screw in Engine Systems

The 3919951 is integral to the assembly and functionality of various engine components. Its design allows for secure fastening, which is essential for maintaining the integrity and performance of the engine system.

Damper

In the context of engine systems, dampers are used to reduce vibrations and oscillations. The 3919951 screw ensures that the damper is firmly attached to its mounting points. This secure attachment is vital for the damper to effectively absorb vibrations, thereby protecting other engine components from undue stress and wear.

Vibration Control

Effective vibration control is paramount in engine systems to ensure smooth operation and longevity. The 3919951 screw plays a role in this by providing a robust connection between vibration-sensitive components and their mounts. This helps in maintaining the balance and stability of the engine, reducing the likelihood of premature wear and failure.

Pulley

Pulleys are often used in engine systems for belt-driven accessories such as alternators, water pumps, and air conditioning compressors. The 3919951 screw is employed to fasten pulleys to the engine block or other structural components. This ensures that the pulleys remain in the correct position and alignment, which is essential for the efficient transfer of power and the smooth operation of belt-driven systems.

Crankshaft

The crankshaft is a fundamental component of the engine, converting linear piston motion into rotational force. The 3919951 screw is used in various applications around the crankshaft, such as securing dampers, sensors, or other accessories. Its reliable fastening capability ensures that these components remain securely in place, contributing to the overall stability and performance of the crankshaft.

Conclusion

The 3919951 Hexagon Flange Head Cap Screw is a vital component in the automotive and heavy-duty truck industry, particularly for Cummins engines. Its robust design, reliable performance, and secure fastening capabilities make it essential for maintaining the structural integrity and efficiency of engine systems. Proper installation, regular maintenance, and understanding its role in various engine components are crucial for ensuring the longevity and reliability of heavy-duty trucks.