3934930
Twelve Point Cap Screw
Cummins®

The 3934930 Twelve-Point Cap Screw, manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. Cummins, a well-respected manufacturer in the industry, produces this component to meet the demanding requirements of heavy-duty applications. This screw plays a role in securing various components within the truck, ensuring structural integrity and reliable performance.

Basic Concepts of Twelve-Point Cap Screws

Twelve-Point Cap Screws are a type of fastener characterized by their hexagonal shape with rounded edges, providing twelve points of contact. This design differs from standard cap screws, which typically have six points. The twelve-point configuration offers enhanced resistance to cam-out, reducing the likelihood of the tool slipping off the screw head during installation or removal. This feature is particularly beneficial in applications where precise torque is required ¹.

Purpose of the 3934930 Twelve-Point Cap Screw

This part is designed to secure critical components within a truck’s structure. It is commonly used in applications where high tensile strength and resistance to vibration are necessary. This includes fastening engine components, chassis parts, and other critical assemblies that undergo significant stress during operation.

Key Features

This Cummins part features a robust design that includes a domed head for improved load distribution and a fully threaded body for versatile application. It is manufactured from high-strength alloy steel, providing excellent durability and resistance to corrosion. The screw’s twelve-point design enhances its ability to withstand high torque applications without rounding or stripping ².

Benefits

Using the 3934930 Twelve-Point Cap Screw offers several advantages. Its design provides improved fastening security, reducing the risk of loosening under vibration. The high-strength material ensures longevity, even in heavy-duty applications. Additionally, the twelve-point head allows for more precise torque application, enhancing the overall reliability of the fastening ³.

Installation Considerations

Proper installation of the 3934930 Twelve-Point Cap Screw is vital to ensure optimal performance. It is recommended to use a torque wrench to achieve the specified torque values, which helps prevent over-tightening or under-tightening. Common mistakes to avoid include using an incorrect tool that may damage the screw head and not lubricating the threads, which can lead to galling and difficulty in future removal.

Troubleshooting and Maintenance

Common issues with the 3934930 Twelve-Point Cap Screw may include loosening due to vibration or corrosion. Regular inspection and maintenance can help identify these issues early. If replacement is necessary, ensure that the new screw meets the same specifications to maintain the integrity of the fastening. Proper removal techniques should be employed to avoid damaging the screw or the surrounding components.

Compatibility and Applications

The 3934930 Twelve-Point Cap Screw is compatible with a wide range of commercial truck models and components. It is commonly used in applications requiring high tensile strength and resistance to vibration, such as engine mounts, chassis components, and other critical assemblies.

Cummins: Manufacturer Overview

Cummins is a renowned manufacturer in the commercial truck industry, known for its commitment to quality and innovation. The company offers a comprehensive range of products designed to meet the rigorous demands of heavy-duty applications. Cummins’ reputation for reliability and performance makes its components, including the 3934930 Twelve-Point Cap Screw, a preferred choice for truck manufacturers and maintenance professionals.

Twelve-Point Cap Screw 3934930 in Cummins Engines

The Twelve-Point Cap Screw 3934930, manufactured by Cummins, is a critical component in several of their engine models. This screw is designed to provide robust fastening capabilities, ensuring secure and reliable connections within the engine assembly.

In the 6C8.3 and C8.3 G engines, the 3934930 screw is utilized in various applications where high-strength fastening is required. These engines benefit from the screw’s ability to withstand significant stress and maintain integrity under operational conditions.

For the C GAS PLUS CM556 engine, the 3934930 screw plays a pivotal role in securing components that are subject to dynamic forces. Its design ensures that the connections remain tight and stable, contributing to the overall reliability of the engine.

Similarly, in the G8.3 engine, the 3934930 screw is employed in critical areas where precision and durability are paramount. The screw’s twelve-point design allows for efficient torque application, facilitating easier and more effective assembly and disassembly processes.

Overall, the 3934930 Twelve-Point Cap Screw is integral to the structural integrity and performance of these Cummins engines, ensuring that all connected parts remain securely fastened under various operational stresses.

Part 3934930 Twelve-Point Cap Screw Component Usage

The 3934930 Twelve-Point Cap Screw is integral to the assembly and functionality of several key components within engine systems. Its role is to provide secure fastening, ensuring that parts remain firmly in place under the dynamic and often strenuous conditions of engine operation.

Lever

In the context of engine systems, levers are often used to transmit force or motion. The Twelve-Point Cap Screw is employed to attach the lever to its mounting point, guaranteeing that the lever remains stable and does not dislodge during operation. This secure attachment is essential for the lever to effectively transfer force, whether it is part of a control mechanism or a component in a mechanical linkage.

Rocker

Rockers in engine systems typically serve to convert linear motion into rotational motion, or vice versa. The Twelve-Point Cap Screw is utilized to fasten the rocker to its pivot point or mounting bracket. This ensures that the rocker can move smoothly and consistently without any risk of detachment, which is vital for the precise operation of the engine’s valve train or other mechanical systems.

Rocker Lever

A rocker lever is a specific type of lever that operates on a rocking motion. It is commonly used in valve trains to open and close valves in an engine. The Twelve-Point Cap Screw secures the rocker lever to its shaft or pivot point, allowing it to rock back and forth with minimal friction and maximum stability. This secure fastening is necessary for the rocker lever to perform its function reliably, ensuring that the valves open and close at the correct times.

Rocker Lever Shaft

The rocker lever shaft is the central pivot around which the rocker lever rotates. The Twelve-Point Cap Screw is used to attach various components to the shaft, such as the rocker lever itself or additional brackets. This ensures that all components remain aligned and securely fastened, allowing the shaft to rotate smoothly and efficiently. The secure attachment provided by the Twelve-Point Cap Screw is essential for the consistent and reliable operation of the rocker lever shaft within the engine system.

Conclusion

The 3934930 Twelve-Point Cap Screw by Cummins is a critical component in the assembly and maintenance of commercial trucks and engines. Its robust design, high-strength material, and twelve-point configuration provide enhanced fastening security, resistance to vibration, and precise torque application. Proper installation, regular maintenance, and understanding its applications within engine systems are essential for ensuring the longevity and reliability of this component.