3979347
Hexagon Head Cap Screw
Cummins®

The Hexagon Head Cap Screw is a fundamental component in the maintenance and assembly of commercial trucks. Its role in securing various parts and assemblies cannot be overstated. Cummins, a renowned manufacturer in the industry, produces a range of high-quality fasteners, including the Hexagon Head Cap Screw Part #3979347. This screw is designed to meet the demanding requirements of commercial truck operations, ensuring reliability and durability in fastening applications ³.

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. The design of the cap screw includes a threaded shank that engages with internal threads in the mating part, providing a secure connection. Cap screws are commonly used in various industries for their strength and reliability in fastening applications ⁴.

Purpose of the 3979347 Hexagon Head Cap Screw in Truck Operations

The 3979347 Hexagon Head Cap Screw by Cummins is specifically designed for use in commercial truck operations. It plays a role in securing critical components and assemblies within the truck, ensuring that parts remain firmly in place under various operating conditions. Common applications of this screw include fastening engine components, attaching body panels, and securing chassis parts. Its design and material properties make it suitable for withstanding the vibrations and stresses encountered in truck operations ¹.

Key Features

The 3979347 Hexagon Head Cap Screw features a robust design that includes a high-strength material composition, typically alloy steel, which provides excellent tensile strength and resistance to wear. The screw has a coarse thread type that allows for quick and secure fastening. The hexagonal head design enables easy engagement with wrenches or sockets, facilitating efficient installation and removal. These features contribute to the screw’s effectiveness and durability in demanding applications ².

Benefits

Using the 3979347 Hexagon Head Cap Screw offers several benefits. Its high-strength material and design provide enhanced durability, ensuring long-lasting performance in commercial truck applications. The ease of installation, thanks to its hexagonal head and coarse thread, reduces assembly time and labor costs. Additionally, the screw’s resistance to loosening under vibration helps maintain secure fastenings, contributing to the overall reliability of truck components. Compared to other fasteners, the 3979347 Hexagon Head Cap Screw stands out for its combination of strength, ease of use, and durability ³.

Installation Guidelines

Proper installation of the 3979347 Hexagon Head Cap Screw is vital to ensure its effectiveness and longevity. Begin by selecting the appropriate wrench or socket that fits the hexagonal head. Align the screw with the mating thread and start threading it by hand to avoid cross-threading. Once the screw is started, use the wrench or socket to tighten it to the specified torque. Adhering to torque specifications is crucial to prevent over-tightening, which can damage the screw or the mating part, and under-tightening, which can lead to loosening. Using the correct tools and following torque guidelines ensures a secure and reliable fastening ⁴.

Maintenance and Troubleshooting

Regular maintenance of the 3979347 Hexagon Head Cap Screw is important to ensure its continued performance and longevity. Inspect the screw periodically for signs of wear, corrosion, or damage. Lubricating the threads with an appropriate lubricant can help reduce friction and wear, especially in high-stress applications. If a screw shows signs of loosening, re-tighten it to the specified torque. In cases where corrosion or damage is present, replacing the screw may be necessary to maintain the integrity of the fastening. Addressing issues promptly helps prevent more significant problems and ensures the reliability of truck components ¹.

Cummins as a Manufacturer

Cummins is a well-established manufacturer with a strong reputation in the industry for producing high-quality truck components. With a history of innovation and commitment to quality, Cummins has built a reputation for reliability and performance. Their Hexagon Head Cap Screw Part #3979347 is a testament to their dedication to providing durable and effective fastening solutions for commercial truck applications. Cummins’ focus on quality and innovation ensures that their products meet the rigorous demands of the trucking industry ².

Role of Part 3979347 Hexagon Head Cap Screw in Engine Systems

In the intricate assembly of engine systems, the part 3979347 Hexagon Head Cap Screw serves as a fundamental fastening component, ensuring the secure attachment and optimal functioning of various engine components.

Alternator Drive

The alternator drive system relies on the precise attachment of components to maintain efficient operation. The Hexagon Head Cap Screw is utilized to fasten the alternator drive pulley to the crankshaft or the alternator itself. This secure attachment is essential for the smooth transfer of rotational force, which is necessary for the alternator to generate electrical power ³.

Belt Tensioner

In the belt tensioner assembly, the Hexagon Head Cap Screw plays a key role in maintaining the correct tension of the drive belt. It is used to secure the tensioner pulley, ensuring that the belt remains properly aligned and tensioned. This is vital for the efficient operation of the alternator, water pump, and other accessories driven by the belt ⁴.

Drive System

Within the broader drive system, which includes various pulleys and brackets, the Hexagon Head Cap Screw is employed to fasten these components securely. This ensures that the drive system operates smoothly, without undue wear or slippage, which could lead to inefficiencies or component failure ¹.

Alternator

The alternator, a key component in the engine’s electrical system, requires secure mounting to the engine block or bracket. The Hexagon Head Cap Screw is used to fasten the alternator in place, ensuring it remains stable and aligned with the drive belt. This secure attachment is essential for the alternator to function correctly and provide a consistent electrical output ².

Tensioner

The tensioner, which maintains the proper tension on the drive belt, is another area where the Hexagon Head Cap Screw is vital. It is used to secure the tensioner mechanism, ensuring that it can adjust the belt tension as needed. This is important for the longevity and efficiency of the belt and the components it drives ³.

Belt

Finally, the drive belt itself, although not directly fastened by the Hexagon Head Cap Screw, benefits from the secure attachment of the components it connects. The screw ensures that pulleys and tensioners are firmly in place, allowing the belt to operate under the correct tension and alignment ⁴.

Conclusion

In summary, the part 3979347 Hexagon Head Cap Screw is a key component in the assembly and maintenance of engine systems, providing the necessary secure attachment for various critical components. Its robust design, ease of installation, and durability make it an essential fastening solution for commercial truck applications.