3950161
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw, identified by part number 3950161, is a specialized fastener produced by Cummins. This screw is significant in heavy-duty truck applications due to its robust design and reliable performance. Cummins, a well-established manufacturer in the automotive industry, ensures that this component meets the stringent demands of heavy-duty truck operations ¹.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by a hexagonal head and a flange beneath the head. This design allows for efficient tightening and loosening using standard tools, such as wrenches or socket drivers. Mechanically, the screw functions by converting torque applied to the head into clamping force, which secures components together. The flange provides additional surface area, enhancing the screw’s resistance to rotation and improving its overall stability in fastening applications ².

Purpose and Role in Truck Operation

This Cummins part plays a specific role in the operation and maintenance of heavy-duty trucks. It is commonly used in applications where secure and durable fastening is required, such as in the assembly of engine components, chassis parts, and various structural elements. Its design ensures that critical components remain firmly attached, contributing to the overall safety and performance of the truck ³.

Key Features

The 3950161 features a hexagonal head, which allows for precise and efficient tightening using standard tools. The flange beneath the head provides additional stability, preventing the screw from rotating during installation or removal. Made from high-quality materials, this screw offers excellent resistance to corrosion and wear, ensuring long-lasting performance in demanding environments. These features contribute to the screw’s functionality and durability, making it a reliable choice for heavy-duty applications.

Benefits

Using the 3950161 in truck maintenance and repair offers several benefits. The screw provides enhanced fastening security, ensuring that components remain securely attached under various operating conditions. Its resistance to vibration reduces the likelihood of loosening over time, which is crucial in the dynamic environment of a heavy-duty truck. Additionally, the screw’s design allows for ease of installation and removal, simplifying maintenance procedures and reducing downtime.

Installation Guidelines

Proper installation of the 3950161 is vital to ensure secure and lasting fastening. Begin by selecting the appropriate tool, such as a wrench or socket driver, to match the hexagonal head. Apply torque according to the manufacturer’s specifications to achieve the correct clamping force without over-tightening, which could damage the screw or the components being fastened. Use a torque wrench for precise application of torque. Ensure that the flange is properly seated against the surface to maximize stability and prevent rotation during operation.

Troubleshooting and Maintenance

Common issues with Hexagon Flange Head Cap Screws include loosening due to vibration and corrosion caused by exposure to harsh environments. Regular inspection of the screws during maintenance checks can help identify these issues early. If corrosion is detected, cleaning the affected area and applying a suitable anti-corrosive treatment can help prolong the screw’s lifespan. In cases where screws show significant wear or damage, replacement with new screws is recommended to maintain the integrity of the fastening.

Cummins: Manufacturer Overview

Cummins Inc. is a leading manufacturer in the diesel engine industry, with a rich history of innovation and quality. Founded in 1919, Cummins has established itself as a trusted name in the automotive sector, providing reliable and high-performance engine solutions. The company’s commitment to quality is evident in its rigorous testing and manufacturing processes, ensuring that all components, including the 3950161, meet the highest standards of durability and performance.

Cummins Hexagon Flange Head Cap Screw 3950161 Compatibility with Engine Models

The Cummins Hexagon Flange Head Cap Screw part number 3950161 is a versatile component designed to fit a variety of engine models. This screw is engineered to provide a secure fastening solution, ensuring that engine components remain tightly secured during operation. Below is a detailed description of its compatibility with various Cummins engine models:

ISC Series Engines

• ISC CM2150
• ISC CM850
• ISC8.3 CM2250
• ISC8.3 CM2880 C102
• ISC9 CM2250/QSL9 CM2250
• QSL8.9 CM2150 L141
• QSL9 CM2250
• QSL9 CM2350 L102
• QSL9 CM850 (CM2850)
• QSL9 G CM558

The 3950161 screw is compatible with the ISC series engines, which include both the ISC CM2150 and ISC CM850 models. It also fits the ISC8.3 CM2250 and ISC8.3 CM2880 C102 engines, providing a reliable fastening solution for these models. Additionally, it is suitable for the ISC9 CM2250/QSL9 CM2250, QSL8.9 CM2150 L141, QSL9 CM2250, QSL9 CM2350 L102, QSL9 CM850 (CM2850), and QSL9 G CM558 engines.

ISL Series Engines

• ISL CM2150
• ISL G CM2180
• ISL9 CM2150
• ISL9 CM2250
• ISL9.5 CM2880 L138

The 3950161 screw is also compatible with the ISL series engines, including the ISL CM2150, ISL G CM2180, ISL9 CM2150, ISL9 CM2250, and ISL9.5 CM2880 L138 models. This screw ensures that the engine components are securely fastened, maintaining the integrity of the engine assembly.

L Series Engines

• L GAS PLUS CM556
• L8.9 CM2670 L134C
• L8.9G CMOH2.0 L125B
• L9 CM2670 L128B
• L9.5 L117

The 3950161 screw fits the L series engines, which include the L GAS PLUS CM556, L8.9 CM2670 L134C, L8.9G CMOH2.0 L125B, L9 CM2670 L128B, and L9.5 L117 models. This compatibility ensures that the screw can be used across a range of L series engines, providing a consistent fastening solution.

Other Engine Models

• 15N CM2380 M104B
• 4B3.9
• 6C8.3
• ISB (Chrysler)
• QSC8.3 CM2880 C102
• QSC8.3 CM850 (CM2850)

The 3950161 screw is also compatible with other engine models such as the 15N CM2380 M104B, 4B3.9, 6C8.3, ISB (Chrysler), QSC8.3 CM2880 C102, and QSC8.3 CM850 (CM2850). This broad compatibility ensures that the screw can be used in a variety of engine configurations, providing a reliable fastening solution across different engine types.

Hexagon Flange Head Cap Screw (Part 3950161) in Engine Systems

The Hexagon Flange Head Cap Screw, identified by part number 3950161, is integral to the assembly and operation of various engine components. Its design and function facilitate secure fastening and reliable performance across multiple systems.

Cylinder Block Assembly

In the cylinder block, the Hexagon Flange Head Cap Screw is used to secure critical components such as the cylinder head and main bearing caps. This ensures that the block remains structurally sound under the high pressures and temperatures generated during engine operation. The flange head provides additional surface area for torque application, enhancing the screw’s ability to withstand vibrational forces.

Engine Crankshaft Support

For the engine crankshaft, these screws are employed to fasten the crankshaft to the cylinder block. This connection is vital for maintaining the crankshaft’s alignment and stability as it rotates at high speeds. The flange head design allows for precise torque settings, which is essential for the crankshaft’s balanced operation and longevity.

Exhaust Recirculation System

In the Exhaust Recirculation (EGR) system, the Hexagon Flange Head Cap Screw is used to secure the EGR valve and associated plumbing. This ensures that the EGR valve operates within specified parameters, contributing to efficient emissions control. The screw’s robust design helps maintain the integrity of the EGR system under varying engine loads and temperatures.

Exhaust Recirculation Water Plumbing

For the Exhaust Recirculation Water Plumbing, these screws are utilized to secure water passages and cooling components. This is important for maintaining consistent temperatures within the EGR system, which is crucial for optimal performance and durability. The flange head provides a secure fastening point that can withstand the thermal expansion and contraction experienced in this system.

Fuel Shutoff Valve

In the Fuel Shutoff Valve assembly, the Hexagon Flange Head Cap Screw is used to secure the valve housing and actuator components. This ensures that the valve can operate reliably under various engine conditions, providing precise control over fuel delivery. The screw’s design allows for easy maintenance and replacement, which is important for the valve’s long-term functionality.

Guard Package

For the Guard Package, these screws are employed to secure protective covers and shields around critical engine components. This not only protects the engine from external debris but also helps in managing heat dissipation. The flange head offers a larger contact area, which enhances the screw’s ability to hold the guard package firmly in place.

Upfit Kit Integration

In Upfit Kits, the Hexagon Flange Head Cap Screw is used to secure additional equipment and accessories to the engine. This includes components like aftermarket sensors, emission control devices, and performance enhancements. The screw’s versatile design allows it to be used in a variety of applications, ensuring that upfit components are securely integrated into the engine system.

Conclusion

The 3950161 Hexagon Flange Head Cap Screw is a critical component in heavy-duty truck applications, offering robust fastening solutions across various engine systems. Its design, featuring a hexagonal head and flange, ensures secure and stable fastening, contributing to the overall safety and performance of the vehicle. Proper installation and maintenance of this screw are essential to ensure long-lasting performance and reliability in demanding environments.