3012481
Captive Washer Cap Screw
Cummins®

The 3012481 Captive Washer Cap Screw, manufactured by Cummins, is a specialized fastener designed for use in commercial trucks. Cummins is renowned for its high-quality components that enhance the performance and reliability of heavy-duty vehicles. This screw is integral to the assembly and maintenance of various truck components, ensuring secure fastening and structural integrity.

Basic Concepts

A Captive Washer Cap Screw is a type of fastener that includes an integrated washer, which is held in place by a groove in the screw’s shank. This design eliminates the need for separate washers, streamlining the installation process and reducing the risk of washer loss or misalignment. The 3012481 consists of a threaded shank, a head for driving, and the captive washer. It functions by providing a secure connection between components, distributing load evenly, and preventing damage to the fastened materials ¹.

Purpose and Role

The 3012481 plays a significant role in the operation of a truck by securing various components and maintaining structural integrity. It is used in applications where consistent and reliable fastening is required, such as in the attachment of body panels, engine components, and other critical assemblies. By ensuring that parts remain firmly in place, this screw contributes to the overall safety and performance of the vehicle ².

Key Features

The 3012481 is characterized by its robust design and high-quality material composition. It is typically made from hardened steel, which provides excellent strength and durability. The integrated washer is designed to distribute pressure evenly across the fastened surface, reducing the risk of damage. Additionally, the screw features a hex head for easy installation and removal using standard tools ³.

Benefits

Using the 3012481 offers several advantages. Its design simplifies the installation process by eliminating the need for separate washers, which can be prone to loss or misalignment. This screw also enhances reliability by providing a secure and consistent connection between components. Furthermore, the use of high-quality materials ensures longevity and reduces the likelihood of failure, potentially leading to cost savings over time.

Installation Process

Proper installation of the 3012481 is crucial for ensuring its effectiveness. Begin by aligning the screw with the designated hole in the component. Using a torque wrench, tighten the screw to the manufacturer’s specified torque settings to avoid over-tightening, which can cause damage, or under-tightening, which can lead to insecure fastening. It is also important to ensure that the surfaces being fastened are clean and free of debris to achieve optimal performance.

Troubleshooting and Maintenance

Common issues with the 3012481 may include loosening over time due to vibration or corrosion. Regular inspection and maintenance can help identify and address these problems early. If loosening is detected, the screw should be re-tightened to the specified torque settings. In cases of corrosion, the affected area should be cleaned, and the screw may need to be replaced to ensure continued reliability.

Safety Considerations

When working with the 3012481, it is important to follow proper safety procedures. This includes wearing appropriate personal protective equipment, such as gloves and safety glasses, to prevent injury. Additionally, ensure that the work area is clean and free of hazards. Proper storage of screws in a dry, organized environment will help maintain their quality and readiness for use. Disposal should comply with local regulations to ensure environmental safety.

Cummins Overview

Cummins is a leading manufacturer in the automotive industry, with a strong reputation for quality and innovation. Founded in 1919, the company has a long history of producing reliable and high-performance components for a variety of applications, including commercial trucks. Cummins is committed to advancing technology and improving the efficiency and durability of its products, making it a trusted name among professionals in the field.

Captive Washer Cap Screw 3012481 in Cummins Engines

The 3012481, manufactured by Cummins, is a critical component in various Cummins engine models. This part is integral to the assembly and maintenance of these engines, ensuring secure fastening and stability.

6 Series Engines

In the 6 Series engines, such as the 6B5.9, 6C8.3, and C8.3 G, the 3012481 is used in several applications. It is often employed in the engine’s mounting system, securing various components to the engine block or other structural parts. This ensures that the engine remains firmly in place and operates smoothly.

ISC Series Engines

For the ISC series engines, including the ISC CM2150, ISC CM554, ISC CM850, ISC8.3 CM2250, the 3012481 is utilized in similar capacities. It is commonly found in the engine’s mounting brackets, valve covers, and other critical areas where secure fastening is necessary. This screw helps maintain the integrity of the engine’s structure and ensures that all parts are properly aligned.

ISL Series Engines

In the ISL series engines, such as the ISL CM2150, ISL CM554, ISL9 CM2150 SN, and ISL9 CM2250, the 3012481 is used extensively. It is often found in the engine’s head gasket, valve cover, and other critical areas. This screw is crucial for maintaining the engine’s sealing and structural integrity, ensuring that the engine operates efficiently and reliably.

ISM Series Engines

The ISM series engines, including the ISM CM570, ISM CM570/870, ISM CM876, and ISM11 CM876 SN, also utilize the 3012481. It is commonly used in the engine’s head gasket, valve cover, and other areas where secure fastening is required. This screw is essential for maintaining the engine’s sealing and structural integrity, ensuring that the engine operates efficiently and reliably.

K Series Engines

In the K series engines, such as the K19, K38, and K50, the 3012481 is used in various applications. It is often employed in the engine’s mounting system, securing various components to the engine block or other structural parts. This ensures that the engine remains firmly in place and operates smoothly.

KTA Series Engines

For the KTA series engines, including the KTA19GC and KTA19GC CM558, the 3012481 is utilized in similar capacities. It is commonly found in the engine’s mounting brackets, valve covers, and other critical areas where secure fastening is necessary. This screw helps maintain the integrity of the engine’s structure and ensures that all parts are properly aligned.

L10 Series Engines

In the L10 series engines, such as the L10 CELECT, L10 GAS, and L10 MECHANICAL, the 3012481 is used extensively. It is often found in the engine’s head gasket, valve cover, and other critical areas. This screw is crucial for maintaining the engine’s sealing and structural integrity, ensuring that the engine operates efficiently and reliably.

M11 Series Engines

For the M11 series engines, including the M11 CELECT and M11 CELECT PLUS, the 3012481 is utilized in similar capacities. It is commonly found in the engine’s mounting brackets, valve covers, and other critical areas where secure fastening is necessary. This screw helps maintain the integrity of the engine’s structure and ensures that all parts are properly aligned.

Role of Part 3012481 Captive Washer Cap Screw in Engine Systems

The 3012481 is instrumental in ensuring the secure and efficient operation of various engine components. Its applications span across multiple systems, contributing to the overall stability and performance of the engine.

Aftercooler Water Outlet Tube

In the aftercooler system, the 3012481 is used to fasten the aftercooler water outlet tube. This ensures a leak-free connection, maintaining the integrity of the cooling process and enhancing the efficiency of the aftercooling system.

Air Compressor Mounting

For the air compressor, this screw plays a key role in securing the compressor to its mounting bracket. This connection is vital for minimizing vibrations and ensuring the compressor operates within its designed parameters.

Air Heater Starting Aid

In the air heater starting aid system, the 3012481 is employed to attach the starting aid to the engine. This secure attachment is essential for the reliable operation of the starting aid, especially in cold-start conditions.

Alternator and Voltage Regulator

The alternator and voltage regulator are critical for maintaining the electrical system of the engine. The 3012481 is used to mount these components securely, ensuring they remain in place and function correctly under varying operational conditions.

Barnes Mounting Pump and Hydraulic Pump

Both the Barnes mounting pump and the hydraulic pump require stable mounting to operate efficiently. The 3012481 is utilized in these applications to provide a robust and vibration-resistant attachment, contributing to the pumps’ longevity and performance.

Fan Drive Arrangement and Fan Mounting Bracket

In the fan drive arrangement and fan mounting bracket, the 3012481 ensures that the fan components are securely fastened. This is important for maintaining proper airflow and cooling within the engine compartment.

FP & Gov Sump and Freon Compressor

The FP & Gov sump and freon compressor rely on secure mounting to function effectively. The 3012481 is used in these applications to ensure that all connections are tight and reliable, preventing leaks and ensuring efficient operation.

Front Water Tube and Water Transfer Tube

For the front water tube and water transfer tube, the 3012481 is essential in creating a secure and leak-proof connection. This is vital for maintaining the cooling system’s efficiency and preventing coolant loss.

Idler Lever and Idler Pulley

In the idler lever and idler pulley systems, the 3012481 ensures that these components are firmly attached. This is important for the smooth operation of belt-driven systems within the engine.

Oil Pan and Oil Pan Adapter Mounting

The oil pan and oil pan adapter mounting require a secure attachment to prevent oil leaks and ensure the oil pan remains in place. The 3012481 provides the necessary stability for these critical components.

PDC Kit and Turbocharger Location

In the PDC kit and turbocharger location, the 3012481 is used to secure these components, ensuring they are properly aligned and mounted. This is essential for the efficient operation of the turbocharger and the overall performance of the engine.

Tube, MTG. & Water Transfer

For the tube, MTG., and water transfer components, the 3012481 ensures that all connections are secure and leak-free. This is crucial for maintaining the integrity of the water transfer system and ensuring efficient cooling.

Conclusion

The 3012481 Captive Washer Cap Screw is a versatile and essential component in various engine systems, providing the necessary stability and secure attachment for optimal engine performance. Its robust design, high-quality materials, and ease of installation make it a reliable choice for securing critical components in commercial trucks and Cummins engines.