3074629
Twelve Point Cap Screw
Cummins®

The Cummins Twelve Point Cap Screw, part number 3074629, is a specialized fastener designed for use in commercial trucks. Cummins, a well-established name in the commercial truck industry, manufactures this part to meet the rigorous demands of heavy-duty applications. This cap screw is integral to ensuring the secure assembly of various truck components, contributing to the overall reliability and performance of commercial vehicles.

Basic Concepts of Twelve Point Cap Screws

A twelve point cap screw is a type of fastener characterized by its hexagonal socket head with twelve equally spaced points. This design offers several advantages over traditional six-point cap screws, including reduced risk of cam-out during tightening and a more secure grip. Twelve point cap screws are commonly used in mechanical applications where high torque and precise fastening are required ¹.

Purpose and Role in Truck Operation

The Cummins Twelve Point Cap Screw, part number 3074629, plays a specific role in the operation of commercial trucks by securing critical components and assemblies. It is typically used in applications where high strength and resistance to loosening are necessary, such as in engine mounts, transmission housings, and chassis components. The secure fastening provided by this cap screw helps maintain the integrity of these systems, ensuring reliable truck operation ².

Key Features

The Cummins Twelve Point Cap Screw, part number 3074629, features a robust design that includes a twelve-point socket head, which allows for more torque to be applied without the risk of the tool slipping. It is made from high-quality materials, such as alloy steel, to ensure durability and resistance to wear. The screw’s unique design also includes a chamfered end for easy insertion into pre-drilled holes, enhancing the efficiency of the installation process ³.

Benefits

The benefits of using the Cummins Twelve Point Cap Screw, part number 3074629, include improved torque application due to its twelve-point design, which reduces the likelihood of cam-out. This feature allows for more consistent and secure fastening. Additionally, the high-quality material used in its construction enhances its durability, making it suitable for the demanding conditions encountered in commercial truck applications ⁴.

Installation and Usage Guidelines

Proper installation of the Cummins Twelve Point Cap Screw, part number 3074629, involves several steps to ensure a secure and lasting connection. Begin by ensuring the mating surfaces are clean and free of debris. Use a torque wrench to apply the recommended torque specifications, which can be found in the vehicle’s service manual. It is also advisable to use a thread lubricant to facilitate installation and prevent galling. Always follow the manufacturer’s guidelines for the correct tightening sequence to avoid over-tightening or under-tightening ⁵.

Troubleshooting and Maintenance

Common issues with the Cummins Twelve Point Cap Screw, part number 3074629, may include loosening over time due to vibration or corrosion. Regular inspection and maintenance are recommended to ensure the screws remain tight and functional. If corrosion is detected, the affected areas should be cleaned, and a corrosion-resistant coating may be applied. In cases where a screw has loosened, re-tightening to the specified torque is necessary. If damage is observed, replacement of the screw is recommended to maintain the integrity of the assembly ⁶.

Safety Considerations

When working with the Cummins Twelve Point Cap Screw, part number 3074629, it is important to follow safety practices to prevent injury and ensure the part’s proper function. Use the appropriate personal protective equipment, such as gloves and safety glasses, when handling and installing the screw. Store the screws in a dry, organized environment to prevent rust and damage. Dispose of any damaged or unused screws according to local regulations to avoid environmental harm ⁷.

Cummins 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 in the commercial truck industry for producing reliable and high-performance components. The company’s extensive product range includes engines, powertrains, and aftermarket parts, all designed to meet the needs of heavy-duty applications. Cummins’ commitment to innovation and quality has made it a trusted name among fleet operators and maintenance professionals ⁸.

Twelve Point Cap Screw 3074629 in Cummins Engines

The Cummins Twelve Point Cap Screw, part number 3074629, is a critical component in various Cummins engine models. This screw is designed to provide robust fastening solutions, ensuring the integrity and stability of engine components. Below is a detailed look at how this part integrates with specific Cummins engines.

K19 and KTA19GC CM558 Engines

In the K19 and KTA19GC CM558 engines, the Cummins Twelve Point Cap Screw is used to secure various engine parts, including the cylinder head and other critical assemblies. Its twelve-point design offers a better grip and reduces the likelihood of rounding off, which is crucial for maintaining the engine’s operational integrity ⁹.

QSK19 CM2350 K114 and QSK19 CM500 Engines

For the QSK19 CM2350 K114 and QSK19 CM500 engines, the cap screw is employed in similar applications. It is integral to the assembly of engine blocks, ensuring that components remain tightly fastened under high operational stresses. The screw’s design allows for easy installation and removal, which is essential during maintenance and repair processes ¹⁰.

QSK19 CM850 MCRS and QSK19G Engines

In the QSK19 CM850 MCRS and QSK19G engines, the Cummins Twelve Point Cap Screw plays a pivotal role in securing the engine’s internal and external components. Its application extends to fastening parts that are subjected to significant mechanical forces, ensuring that the engine operates efficiently and reliably ¹¹.

V28 Engine

The V28 engine also utilizes the Cummins Twelve Point Cap Screw for securing various engine components. This screw’s high strength and durability make it suitable for the demanding conditions within the engine, providing a reliable fastening solution that enhances the engine’s overall performance and longevity ¹².

Role of Part 3074629 Twelve Point Cap Screw in Engine Systems

The Cummins Twelve Point Cap Screw, part number 3074629, is integral in securing and maintaining the structural integrity of various components within engine systems. Its application spans across multiple assemblies, ensuring that parts remain firmly in place under operational stresses.

In the air compressor support system, this cap screw is used to fasten the compressor to its mounting brackets. This secure attachment is essential for the stable operation of the compressor, which is responsible for providing the necessary air pressure for engine functions.

Within the compressor itself, the Twelve Point Cap Screw is often employed to attach the compressor cover. This ensures that the internal components are shielded from external contaminants and that the compressor operates efficiently.

For the starter flange and flywheel housing, the cap screw plays a significant role in connecting these components to the engine block. This connection is vital for the proper alignment and function of the starting motor, which relies on a precise fit to engage with the flywheel effectively.

In the flywheel housing, the Twelve Point Cap Screw is used to secure the housing to the engine, ensuring that the flywheel operates within its designed parameters. This is particularly important during the starting process, where the flywheel’s inertia helps to crank the engine.

The starter hole cover is another area where this cap screw is utilized. By securing the cover in place, it prevents debris from entering the starter mechanism, thus maintaining the starter’s reliability and performance.

Lastly, in the starter mounting system, the Twelve Point Cap Screw is crucial for attaching the starter to the engine. This secure attachment ensures that the starter can deliver the necessary torque to the flywheel, facilitating a smooth and reliable engine start.

Overall, the Cummins Twelve Point Cap Screw, part number 3074629, is a fundamental component in the assembly and maintenance of engine systems, providing the necessary connections and security for various critical parts.

Conclusion

The Cummins Twelve Point Cap Screw, part number 3074629, is a vital component in the assembly and maintenance of commercial truck and engine systems. Its robust design, high-quality materials, and twelve-point socket head ensure secure fastening and durability under demanding conditions. Proper installation, regular maintenance, and adherence to safety practices are essential to maximize the benefits of this part and ensure the reliable operation of commercial vehicles and engines.