3918568
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw, Part #3918568, manufactured by Cummins, is a specialized fastener designed for heavy-duty applications. Its significance in the heavy-duty truck industry lies in its robust design and reliable performance, which contribute to the overall durability and efficiency of truck components. Cummins, a well-established name in the industry, ensures that this part meets stringent quality standards, making it a preferred choice for truck manufacturers and maintenance professionals.

Basic Concepts of Twelve Point Cap Screws

A Twelve Point Cap Screw is a type of fastener characterized by its twelve-sided head, which provides a larger contact area compared to traditional hex-head screws. This design reduces the risk of cam-out during tightening and offers better torque application. In the automotive industry, twelve-point cap screws are commonly used in applications requiring high strength and resistance to loosening, such as in engine components and chassis assemblies ¹.

Role of the 3918568 Twelve Point Cap Screw in Truck Operation

This Cummins part plays a role in various aspects of heavy-duty truck operation. It is utilized in engine components where it secures critical parts that are subject to high stress and vibration. Additionally, it is employed in chassis assembly to ensure the structural integrity of the truck. Its applications extend to other areas where reliable fastening is required to maintain performance and safety standards ².

Key Features of the 3918568 Twelve Point Cap Screw

The 3918568 Twelve Point Cap Screw is designed with several features that make it suitable for heavy-duty applications. Its twelve-point head design allows for more torque to be applied without the risk of rounding off the fastener. The thread pitch is optimized for secure fastening, and the grade of steel used ensures durability under high stress conditions. These design elements contribute to the screw’s ability to perform reliably in demanding environments ³.

Benefits of Using the 3918568 Twelve Point Cap Screw

Using this part offers several advantages. The design of the screw allows for enhanced torque application, which is beneficial in tightening fasteners in hard-to-reach areas or under high-stress conditions. The reduced risk of cam-out ensures that the screw can be tightened more effectively, and its improved durability under high stress conditions makes it a long-lasting solution for heavy-duty applications.

Installation and Usage Guidelines

Proper installation of the 3918568 Twelve Point Cap Screw is important for ensuring its performance and longevity. It is recommended to use the appropriate tools for installation, such as a torque wrench, to apply the correct amount of torque specified by the manufacturer. Following the torque specifications ensures that the screw is tightened to the optimal level, which helps prevent over-tightening or under-tightening that could lead to failure.

Troubleshooting and Maintenance

Common issues that may arise with the 3918568 Twelve Point Cap Screw include stripping or seizing. To prevent these issues, it is important to use the correct torque settings during installation and to avoid over-tightening. Regular maintenance checks should be performed to ensure that the screws remain secure and have not loosened over time. If a screw shows signs of wear or damage, it should be replaced to maintain the integrity of the assembly.

Cummins: A Brief 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 heavy-duty truck industry for producing reliable and high-performance components. The company’s product range includes engines, powertrain components, and aftermarket parts, all of which are designed to meet the demanding requirements of heavy-duty applications.

Twelve Point Cap Screw 3918568 Compatibility with Cummins Engines

The Twelve Point Cap Screw part number 3918568, manufactured by Cummins, is a versatile component that fits a variety of Cummins engines. This screw is designed to provide secure fastening in applications where high strength and durability are required. Below is a breakdown of the engines with which this screw is compatible, grouped for clarity:

Small Bore Engines

• 4B3.9
• 6B5.9
• B4.5
• B4.5 RGT
• B5.9 G
• B5.9 GAS PLUS CM556

Medium Bore Engines

• ISB CM550
• QSB3.9 30 CM550
• QSB4.5 CM850 (CM2850)
• QSB5.9 30 CM550
• QSB5.9 44 CM550

Large Bore Engines

• ISBE CM800
• QSB6.7 CM850 (CM2850)

The Twelve Point Cap Screw 3918568 is engineered to meet the stringent demands of these engines, ensuring reliable performance and longevity in various operational conditions.

Role of Part 3918568 Twelve Point Cap Screw in Engine Systems

In the intricate assembly of engine systems, the Part 3918568 Twelve Point Cap Screw serves as a fundamental fastening element, ensuring the secure attachment of various components.

Mounting Applications

The Twelve Point Cap Screw is extensively used in mounting applications where stability and resistance to loosening are paramount. It plays a significant role in securing engine components to the chassis or other structural elements. Its design allows for efficient torque application, minimizing the risk of over-tightening or stripping, which is essential for maintaining the integrity of the mounting points over the engine’s operational life.

Starting Motor Assembly

In the starting motor assembly, the Twelve Point Cap Screw is employed to fasten the motor to its housing or the engine block. This secure attachment is vital for the motor’s operation, as it ensures that the motor remains firmly in place during the high-torque starting process. The screw’s twelve-point design provides a greater contact area than traditional hex screws, reducing the likelihood of cam-out and enhancing the overall reliability of the starting system.

Starter Motor Mounting

For starter motor mounting, the Twelve Point Cap Screw is instrumental in attaching the starter motor to the engine. This connection must withstand the substantial forces generated during engine start-up. The screw’s robust design ensures a tight and durable fit, which is essential for the consistent performance of the starter motor. Its use in this application underscores the importance of selecting the appropriate fastener to handle the dynamic loads experienced in engine systems.

Conclusion

The 3918568 Twelve Point Cap Screw by Cummins is a critical component in heavy-duty truck and engine systems, offering robust performance and reliable fastening in demanding applications. Its unique twelve-point design, compatibility with a wide range of Cummins engines, and the benefits it provides in terms of torque application and durability make it an indispensable part for professionals in the automotive and heavy-duty truck industries.