3005436
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw, identified by part number 3005436, is a specialized fastener produced by Cummins, a renowned manufacturer in the automotive and heavy-duty truck industry. This component is integral to the assembly and maintenance of commercial trucks, ensuring secure and reliable fastening in various applications.

Basic Concepts

A Twelve Point Cap Screw is a type of bolt characterized by its twelve-sided head, which provides a larger contact area compared to traditional hex cap screws. This design facilitates more efficient torque application and reduces the likelihood of cam-out during tightening. The screw is threaded along its length to engage with a corresponding threaded hole, creating a strong and secure connection ¹.

Purpose and Role in Truck Operation

The 3005436 Twelve Point Cap Screw plays a significant role in the operation and maintenance of commercial trucks. It is used in applications where secure fastening is required, such as attaching components to the chassis, securing engine parts, and assembling various truck body panels. Its design ensures that connections remain tight under vibration and stress, which are common in heavy-duty truck operations ².

Key Features

The 3005436 Twelve Point Cap Screw features a twelve-point head design that offers enhanced grip and reduced risk of rounding compared to traditional hex cap screws. It is typically made from high-strength materials such as alloy steel, which provides durability and resistance to corrosion. The screw’s precise threading ensures a secure fit, and its overall design is optimized for ease of installation and removal ³.

Benefits

The twelve-point design of the 3005436 screw offers several advantages. It allows for improved torque application, which means that more force can be applied to tighten the screw without the risk of damaging the head. This design also reduces the likelihood of cam-out, where the tool slips off the screw head during tightening. Additionally, the larger contact area provided by the twelve-point head enhances the grip, leading to more secure fastening ⁴.

Installation Considerations

Proper installation of the 3005436 Twelve Point Cap Screw is crucial for optimal performance and longevity. It is recommended to use the correct torque specifications provided by the manufacturer to avoid over-tightening or under-tightening. Using a torque wrench ensures that the screw is tightened to the precise torque required for the application. Additionally, ensuring that the mating surfaces are clean and free of debris will help achieve a secure and lasting connection ⁵.

Troubleshooting and Maintenance

Common issues with Twelve Point Cap Screws may include loosening over time due to vibration or corrosion. Regular inspection and maintenance can help identify and address these issues promptly. If a screw appears loose, it should be re-tightened to the specified torque. In cases where corrosion is present, the affected area should be cleaned, and an appropriate anti-seize compound may be applied to prevent future corrosion. Replacing damaged or worn screws is also important to maintain the integrity of the fastening ⁶.

Manufacturer - Cummins

Cummins is a well-established manufacturer with a strong reputation in the automotive and heavy-duty truck industry. The company is known for its commitment to producing high-quality components that meet the demanding requirements of commercial vehicles. Cummins’ history of innovation and excellence ensures that their products, including the 3005436 Twelve Point Cap Screw, are reliable and perform well in various applications ⁷.

Twelve Point Cap Screw 3005436 Compatibility with Cummins Engines

The Twelve Point Cap Screw part number 3005436, manufactured by Cummins, is designed to fit seamlessly with a range of Cummins engines. This part is integral in securing various components within the engine assembly, ensuring stability and reliability during operation.

K38 and K50 Engines

For the K38 and K50 engines, the 3005436 cap screw is utilized in several critical applications. It is commonly used in the mounting and fastening of engine components, providing the necessary strength and durability to withstand the operational stresses these engines encounter.

QST30 CM2350 T101 and QST30 CM552 Engines

In the QST30 CM2350 T101 and QST30 CM552 engines, the 3005436 cap screw plays a vital role in securing various engine parts. Its twelve-point design ensures a better grip and more efficient tightening, which is crucial for maintaining the integrity of the engine’s structure. This part is often found in applications where precise fastening is required to ensure optimal performance and longevity of the engine.

QSX15 CM2250 ECF and QSX15 CM2350 X105 Engines

The QSX15 CM2250 ECF and QSX15 CM2350 X105 engines also benefit from the use of the 3005436 cap screw. This part is essential in the assembly and maintenance of these engines, providing the necessary fastening for components that are subject to high mechanical loads. The cap screw’s design ensures that it can handle the rigors of engine operation, contributing to the overall reliability and efficiency of the engine.

By incorporating the 3005436 cap screw into their design, Cummins ensures that these engines can perform reliably under demanding conditions, maintaining their structural integrity and operational efficiency.

Role of Part 3005436 Twelve Point Cap Screw in Engine Systems

The Part 3005436 Twelve Point Cap Screw is integral to the assembly and functionality of several key components within engine systems. Its application ensures secure fastening and reliable operation across various engine parts.

Crank Pulley and Damper

In the crank pulley and damper assembly, the Twelve Point Cap Screw is used to fasten the pulley to the crankshaft. This secure attachment is essential for maintaining the alignment and balance of the pulley, which in turn ensures smooth operation of the damper. The damper’s role is to absorb vibrations, and a firmly attached pulley contributes to the effectiveness of this function.

Vibration Management

Effective vibration management within the engine is partly dependent on the secure fastening of components. The Twelve Point Cap Screw plays a role in this by ensuring that parts like the fan spacer and mounting components are tightly secured. This reduces the likelihood of vibrations that could lead to inefficiencies or damage over time.

Fan Spacer Mounting

The fan spacer mounting is another area where the Twelve Point Cap Screw is utilized. By securely fastening the spacer to the pulley, it helps maintain the correct spacing and alignment between the fan and the pulley. This is vital for the efficient operation of the cooling system, as proper spacing ensures optimal airflow and cooling performance.

Pulley and Crankshaft Connection

The connection between the pulley and the crankshaft is a high-stress area where the Twelve Point Cap Screw provides the necessary strength and reliability. This secure attachment is essential for transmitting power efficiently from the crankshaft to the pulley, which drives ancillary components such as the alternator and water pump.

Spacer and Fan Pilot

In the spacer and fan pilot assembly, the Twelve Point Cap Screw ensures that the spacer is correctly positioned and held in place. This is important for maintaining the structural integrity of the fan assembly and ensuring that the fan pilot operates within the designed parameters. Proper fastening here contributes to the overall stability and performance of the engine’s cooling system.

Conclusion

The 3005436 Twelve Point Cap Screw is a critical component in the assembly and maintenance of commercial trucks and Cummins engines. Its unique design, made from high-strength materials, ensures secure fastening and reliable operation under demanding conditions. Proper installation and maintenance are essential to maximize the performance and longevity of this part.