3919952
Hexagon Flange Head Cap Screw
Cummins®

The Hexagon Flange Head Cap Screw (Part #3919952), produced by Cummins, is a critical fastener widely used in the commercial truck industry. This article provides an overview of this Cummins part, its purpose, key features, benefits, and maintenance suggestions.

Basic Concepts

A Hexagon Flange Head Cap Screw is a type of bolt characterized by a hexagonal head and a flange beneath the head. The hexagonal head allows for easy tightening and loosening using a wrench or socket, while the flange provides additional surface area to distribute the load and prevent the screw from sinking into the material.

Purpose and Function

This part plays a role in securing various components within a truck’s structure. It is commonly used in applications where a combination of high tensile strength and resistance to loosening is required. This screw helps in maintaining the integrity of assemblies by providing a secure and stable connection.

Key Features

• Hexagonal head for easy tool engagement.
• Flange under the head to distribute load and prevent sinking.
• High tensile strength material, typically steel, for durability.
• Zinc or other coatings for corrosion resistance.
• Available in various sizes to accommodate different applications.

Benefits

• Enhanced security due to the flange design, which reduces the risk of the screw working loose over time.
• Improved load distribution, which helps in preventing damage to the fastened materials.
• Corrosion resistance provided by coatings, extending the lifespan of the screw in various environments.
• Versatility in applications due to the availability of different sizes and materials.

Troubleshooting and Maintenance

Regular inspection of Hexagon Flange Head Cap Screws is recommended to ensure they remain tight and have not corroded. If corrosion is detected, the affected screws should be replaced to prevent failure. Additionally, using the correct torque specifications when installing these screws helps in maintaining their integrity and performance ¹.

Cummins Engine Compatibility with Hexagon Flange Head Cap Screw Part 3919952

The Hexagon Flange Head Cap Screw part number 3919952, manufactured by Cummins, is a versatile component that fits into various engine models. This screw is designed to provide a secure fastening solution, ensuring that engine components remain tightly secured during operation. Here is a detailed look at the engines compatible with this part:

ISC Series Engines

• ISC CM2150
• ISC CM554
• ISC CM850
• ISC8.3 CM2250

ISL Series Engines

• ISL CM2150
• ISL CM554
• ISL G CM2180
• ISL9 CM2150 SN
• ISL9 CM2250
• ISL9.5 CM2880 L138

ISB Series Engines

• ISB CM850
• ISB3.9 CM2220 B107
• ISB5.9 CM2880 B127

ISBE Series Engines

• ISBE CM800

ISX Series Engines

• ISX CM570
• ISX CM870
• ISX15 CM2250
• ISX15 CM2250 SN

Other Cummins Engines

• 4B3.9
• 6B5.9
• 6C8.3
• B5.9 CM2670 B166C
• B5.9 GAS PLUS CM556
• C GAS PLUS CM556
• C8.3 G
• ISB CM850

Role of Part 3919952 Hexagon Flange Head Cap Screw in Engine Systems

The Hexagon Flange Head Cap Screw (part 3919952) is integral to the assembly and operation of various engine components. Its primary function is to provide secure fastening, ensuring that components remain firmly in place under operational stress. Below are the key areas where this screw plays a significant role:

Aftercooler

In the aftercooler system, the Hexagon Flange Head Cap Screw is used to secure the mounting brackets and housing components. This ensures efficient heat exchange and maintains the structural integrity of the aftercooler.

Alternator Mounting

For alternator mounting, this screw is essential in attaching the alternator to the engine block or mounting bracket. It ensures that the alternator remains stable and properly aligned, which is vital for consistent power generation.

Breather and Crankcase

In the breather and crankcase systems, the screw is employed to fasten breather housings and crankcase covers. This helps in maintaining the pressure balance within the crankcase and ensures that the breather system functions correctly.

Compressor (Air and Refrigerant)

For both air and refrigerant compressors, the Hexagon Flange Head Cap Screw is used to secure compressor housings and mounting brackets. This is important for the efficient operation of the compressor, ensuring that it can handle the required pressure and temperature conditions.

Cylinder Head Lifting Fixture

In the cylinder head lifting fixture, this screw is utilized to secure the fixture components. This ensures that the cylinder head can be safely and effectively lifted during maintenance or replacement procedures.

Drive Systems (Engine Barring, Fan, Front Gear Train Accessory, Fuel Pump, Water Pump)

Across various drive systems including engine barring, fan, front gear train accessory, fuel pump, and water pump, the screw is used to fasten drive components and housings. This ensures that these systems operate smoothly and efficiently, contributing to the overall performance of the engine.

Filter (Lubricating Oil)

In the lubricating oil filter system, the screw is used to secure the filter housing. This is essential for maintaining the filtration efficiency and ensuring that the engine receives clean oil.

Flywheel Housing and Assemblies

For the flywheel housing and top-level assembly housing, the screw is critical in securing these components. This ensures that the flywheel operates within the correct parameters, contributing to the engine’s balance and performance.

Fuel Pump Housing

In the fuel pump housing, the screw is used to secure the pump components. This ensures that the fuel pump delivers consistent fuel pressure to the engine.

Plumbing and Charge Air Bypass

In plumbing and charge air bypass systems, the screw is employed to secure pipes, fittings, and bypass valves. This is important for maintaining the integrity of the air and fluid pathways within the engine system.

Rear Power Take-Off Kit

For the rear power take-off kit, the screw is used to secure the kit components to the engine. This ensures that the power take-off system functions correctly, providing auxiliary power as needed.

Auxiliary Cooling System

In the auxiliary cooling system, the screw is utilized to fasten cooling components and housings. This ensures that the cooling system operates efficiently, maintaining optimal engine temperature.

Conclusion

The Hexagon Flange Head Cap Screw (part 3919952) is a versatile and essential component in the assembly and maintenance of various engine systems. Its design ensures that each component functions correctly and remains securely in place, contributing to the overall performance and reliability of the engine.