3949830
Round Head Cap Screw
Cummins®

The 3949830 Round Head Cap Screw is a component manufactured by Cummins, a well-established name in the commercial truck industry. This screw is designed for use in various applications within commercial trucks, contributing to the secure assembly of different truck components.

Basic Concepts of Round Head Cap Screws

A Round Head Cap Screw is a type of fastener characterized by a rounded head and a threaded shaft. It is commonly used in mechanical assemblies to secure components together. The rounded head provides a larger surface area for distribution of clamping force, which helps in preventing damage to the fastened materials. Additionally, the head design allows for easy removal and installation using common tools ¹.

Purpose of the 3949830 Round Head Cap Screw in Trucks

The 3949830 Round Head Cap Screw plays a role in the operation and maintenance of commercial trucks by securing various components within the truck’s systems. It is utilized in applications such as engine assemblies, chassis parts, and other critical areas where reliable fastening is required. Its design ensures that components remain securely attached, even under the dynamic conditions experienced by commercial trucks ².

Key Features

The 3949830 Round Head Cap Screw is crafted from high-quality materials, ensuring durability and performance. It features a specific thread type that provides a strong grip, enhancing the fastening strength. The rounded head is designed for efficient torque application, facilitating easy installation and removal. Additionally, the screw may possess unique attributes that improve its resistance to corrosion and vibration, contributing to its longevity in harsh operating environments ³.

Benefits

Using the 3949830 Round Head Cap Screw offers several advantages. Its design contributes to improved fastening strength, ensuring that components remain securely attached. The screw’s resistance to vibration helps maintain the integrity of the fastening over time, even in demanding conditions. Furthermore, its durability ensures a longer lifespan, reducing the need for frequent replacements ⁴.

Installation Guidelines

Proper installation of the 3949830 Round Head Cap Screw is vital for effective fastening. It is recommended to follow torque specifications provided by the manufacturer to ensure the screw is tightened to the appropriate level. Using the correct tools and techniques during installation will help achieve a secure and lasting fastening. Additionally, inspecting the screw and fastened components periodically can help identify any issues early on ⁵.

Troubleshooting and Maintenance

Common issues with Round Head Cap Screws may include loosening due to vibration or corrosion over time. Regular inspection can help identify such problems. If loosening is detected, re-tightening the screw to the specified torque can often resolve the issue. In cases of corrosion, cleaning the affected area and applying a suitable corrosion-resistant coating may be necessary to prolong the screw’s lifespan ⁶.

Cummins: Manufacturer Overview

Cummins Inc. is a renowned manufacturer in the commercial truck industry, known for its wide range of products and strong reputation. With a history of innovation and quality, Cummins has established itself as a trusted provider of components and systems for commercial vehicles. The company’s commitment to excellence is reflected in its products, including the 3949830 Round Head Cap Screw, which is designed to meet the demanding requirements of commercial truck applications ⁷.

Cummins Round Head Cap Screw 3949830 Compatibility

The Cummins Round Head Cap Screw part number 3949830 is a versatile component that fits a variety of Cummins engines. This part is designed to secure various engine components, ensuring stability and integrity during operation. Below is a detailed description of the engines with which this cap screw is compatible:

B-Series Engines

• B4.5 RGT
• B5.6 CM2670 B152B
• B6.7 CM2670 B164C
• B6.7 G CMOH6.0 B125

The B-Series engines, including the B4.5, B5.6, and B6.7 variants, utilize the 3949830 cap screw in various applications. These engines are known for their robust design and are commonly used in agricultural and industrial machinery.

ISB Engines

• ISB (Chrysler)
• ISB CM2150
• ISB CM850
• ISB/ISD6.7 CM2150 SN
• ISB6.7 CM2250
• ISB6.7 CM2350 B101
• ISB6.7 G CM2180 B118
• ISBE CM2150
• ISBE4 CM850

The ISB engines, including both the ISB and ISBE variants, are another category where the 3949830 cap screw is frequently used. These engines are known for their high performance and reliability, often found in heavy-duty trucks and construction equipment.

QSB Engines

• QSB4.5 CM2250 EC
• QSB4.5 CM850 (CM2850)
• QSB5.9 CM850
• QSB6.7 CM2250
• QSB6.7 CM850 (CM2850)
• QSB6.7 M CM2250
• QSB7 CM2880 B117

The QSB engines, ranging from QSB4.5 to QSB7, also incorporate the 3949830 cap screw in their design. These engines are typically used in a variety of applications, from agricultural to marine, due to their versatility and durability.

Summary

The Cummins Round Head Cap Screw 3949830 is a critical component in securing various parts of the B-Series, ISB, and QSB engines. Its compatibility across these engine models highlights its importance in maintaining the structural integrity and performance of Cummins engines.

Role of Part 3949830 Round Head Cap Screw in Engine Systems

The part 3949830 Round Head Cap Screw is integral to the assembly and maintenance of various engine components. Its primary function is to secure and fasten different parts together, ensuring structural integrity and proper operation of the engine system.

Block Assembly

In the context of the engine block, the Round Head Cap Screw is used to fasten components such as the cylinder block hardware kit. This ensures that all parts are held firmly in place, reducing the risk of misalignment or movement during engine operation. The screw’s design allows for efficient torque application, which is essential for maintaining the precise specifications required for optimal engine performance.

Cylinder and Cylinder Block

When dealing with the cylinder and cylinder block, the Round Head Cap Screw plays a significant role in securing the cylinder block kit. This kit often includes various fasteners and components that need to be tightly secured to prevent any form of leakage or structural failure. The screw’s round head provides a smooth surface that reduces the likelihood of damage to adjacent parts during installation and removal.

Noise Reduction Device

In applications involving noise reduction devices, the Round Head Cap Screw is employed to attach these devices to the engine block or other components. Effective fastening is vital to ensure that the noise reduction device functions as intended, minimizing unwanted noise and vibrations that can affect both the engine’s performance and the overall driving experience.

Long Block and Long Block Kit

For the long block and long block kit, the Round Head Cap Screw is used extensively to secure various components within these assemblies. The long block, which includes the engine block, crankshaft, pistons, and other essential parts, relies on these screws to maintain the integrity of its structure. In the long block kit, which often contains additional components and hardware, the screw ensures that all elements are correctly fastened, contributing to the smooth operation and longevity of the engine.

Conclusion

The 3949830 Round Head Cap Screw is a vital component in the assembly and maintenance of Cummins engines, ensuring the secure fastening of various engine components. Its compatibility with a wide range of Cummins engines underscores its importance in maintaining the structural integrity and performance of these engines. Proper installation, regular maintenance, and understanding its role in different engine systems are essential for maximizing the effectiveness of this Cummins part.