3681174
Hexagon Flange Head Cap Screw
Cummins®

Introduction

The Hexagon Flange Head Cap Screw (Part #3681174) is a fastener produced by Cummins, widely used in the commercial truck industry. This article provides an overview of the Hexagon Flange Head Cap Screw, 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 flanged base. The hexagonal head allows for easy tightening and loosening using a wrench or socket, while the flange provides additional surface area for load distribution and prevents the screw from being driven too far into the material ¹.

Purpose and Function

The 3681174 Hexagon Flange Head Cap Screw 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. The flange head design ensures that the screw remains flush with the surface, reducing the risk of damage to adjacent parts ².

Key Features

• Hexagonal head for easy tool engagement
• Flanged base for load distribution and prevention of over-driving
• High tensile strength suitable for heavy-duty applications
• Corrosion-resistant coating for durability in various environments

Benefits

• Enhanced security due to the flanged design
• Improved load distribution across the fastening area
• Resistance to loosening under vibration, common in truck operations
• Durable construction suitable for long-term use in demanding conditions

Troubleshooting and Maintenance

Regular inspection of Hexagon Flange Head Cap Screws is recommended to ensure they remain tight and free of corrosion. If corrosion is detected, the affected screws should be replaced to maintain structural integrity. Additionally, using the correct torque specifications during installation helps prevent over-tightening or under-tightening, which can lead to screw failure ³.

About Cummins

Cummins Inc. is a global power leader that designs, manufactures, and distributes engines, filtration, and power generation products. With a strong emphasis on innovation and quality, Cummins provides reliable components for various industries, including the commercial truck sector ⁴.

Hexagon Flange Head Cap Screw 3681174 in Cummins Engines

This Cummins part, the Hexagon Flange Head Cap Screw part number 3681174, is a critical component used in various Cummins engine models. This screw is designed to secure different parts within the engine assembly, ensuring structural integrity and operational efficiency.

ISX Series Engines

• ISX CM570
• ISX CM870
• ISX CM871
• ISX15 CM2250
• ISX15 CM2250 SN
• ISX15 CM2350 X101

The ISX series engines utilize the 3681174 screw in multiple applications, often in areas requiring robust fastening to withstand high stress and torque. This screw is integral in securing components such as cylinder heads, valve covers, and other critical engine parts.

QSX Series Engines

• QSX15 CM2250
• QSX15 CM2250 ECF
• QSX15 CM2350 X105

In the QSX series engines, the 3681174 screw is similarly employed to maintain the structural integrity of various engine components. Its use in these engines ensures that parts remain tightly secured, which is vital for the engine’s performance and longevity.

X15 Series Engines

• X15 CM2350 X116B
• X15 CM2350 X123B
• X15 CM2450 X134B

The X15 series engines also benefit from the 3681174 screw in several applications. This screw is used to fasten parts that are exposed to extreme conditions, ensuring that the engine can operate reliably under various loads and temperatures.

Role of Part 3681174 Hexagon Flange Head Cap Screw in Engine Systems

The part 3681174 Hexagon Flange Head Cap Screw is integral to the assembly and operation of various engine components. Its design and functionality are tailored to ensure secure fastening and reliable performance under demanding conditions.

Cylinder Block

In the cylinder block, the 3681174 Hexagon Flange Head Cap Screw is used to fasten critical components such as the cylinder head, main bearing caps, and various brackets. The flange head design provides a larger surface area for distribution of clamping force, reducing the risk of stripping and ensuring a tight seal. This is particularly important in the cylinder block where maintaining precise tolerances and sealing surfaces is essential for engine performance and longevity. The screw’s hexagonal head allows for efficient torque application, minimizing the chance of cam-out during installation or removal ⁵.

Conclusion

The 3681174 Hexagon Flange Head Cap Screw is a vital component in the commercial truck industry, offering high tensile strength, resistance to loosening, and durable construction. Its use in various Cummins engine models ensures secure fastening and reliable performance under demanding conditions. Regular maintenance and proper installation are essential to maximize the benefits of this part.