205377
Twelve Point Cap Screw
Cummins®

The Twelve Point Cap Screw, identified by Part #205377, is a specialized fastener produced by Cummins, a leading manufacturer in the commercial truck industry. This screw is integral to the maintenance and operation of commercial trucks, providing reliable fastening solutions that ensure the integrity and safety of various truck components.

Basic Concepts

A Twelve Point Cap Screw is a type of fastener characterized by its hexagonal socket head, which features twelve points instead of the traditional six. This design allows for a more secure fit with socket wrenches, reducing the likelihood of slippage during torque application. The screw is threaded along its length, enabling it to be screwed into pre-drilled holes to hold components together securely ¹.

Purpose and Role in Truck Operation

This Cummins part plays a significant role in the operation and maintenance of commercial trucks. It is utilized in various applications across the truck, including but not limited to, securing engine components, attaching body panels, and fastening chassis parts. Its robust design ensures that critical components remain securely in place, contributing to the overall safety and performance of the vehicle ².

Key Features

The Twelve Point Cap Screw boasts several key features that enhance its performance and durability. Its twelve-point design provides a more secure fit with tools, reducing the risk of cam-out during installation or removal. The screw is typically made from high-strength materials, such as alloy steel, which offers superior resistance to wear and corrosion. Additionally, the screw’s design may include features like a chamfered end for easy insertion and a flat head for a flush fit with surfaces ³.

Benefits

The advantages of using the Twelve Point Cap Screw include improved torque application due to its unique design, which allows for higher torque values without the risk of damaging the screw or the tool. The reduced risk of cam-out ensures a more secure fastening process, while the material composition contributes to the screw’s durability and resistance to environmental factors. These benefits make it a reliable choice for critical fastening applications in commercial trucks.

Installation Guidelines

Proper installation of the Twelve Point Cap Screw is vital to ensure optimal performance and longevity. Begin by selecting the appropriate size screw for the application. Use a pilot hole slightly smaller than the screw’s diameter to facilitate easier insertion and reduce the risk of stripping the threads. Apply the screw using a suitable twelve-point socket wrench, ensuring that the tool engages fully with the screw head to prevent slippage. Torque the screw to the manufacturer’s specified value to ensure a secure fit without over-tightening, which could damage the screw or the component being fastened.

Troubleshooting and Maintenance

Common issues with Twelve Point Cap Screws include loosening over time due to vibration or thermal expansion and contraction. Regular inspection and tightening of screws can help prevent these issues. If a screw appears damaged or corroded, it should be replaced to maintain the integrity of the fastening. Proper maintenance practices, such as applying a thread locker or anti-seize compound where appropriate, can also prolong the lifespan of the fastener.

Safety Considerations

When working with Twelve Point Cap Screws, it is important to observe safety guidelines to prevent accidents. Always use the correct tool for the screw to avoid damage to the fastener or the risk of injury. Wear appropriate personal protective equipment, such as gloves and safety glasses, to protect against flying debris or tool slippage. Ensure that the work area is clean and free of obstacles to prevent accidents during installation or removal.

Cummins 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 commercial truck industry for producing reliable and high-performance components. The company’s product portfolio includes a wide range of engines, powertrains, and aftermarket parts, all designed to meet the demanding requirements of commercial transportation.

Twelve Point Cap Screw 205377 Compatibility with Cummins Engines

This Cummins part is a versatile component that fits a range of Cummins engines. This screw is designed to provide robust fastening capabilities, ensuring secure connections in various engine assemblies. Below is a detailed overview of its compatibility with specific Cummins engines:

K-Series Engines

• K19
• K38
• K50

This part is compatible with the K-Series engines, including the K19, K38, and K50 models. These engines are known for their reliability and efficiency, and the screw’s design ensures it can withstand the operational stresses these engines encounter.

QSK38 Engines

• QSK38 CM2150 MCRS
• QSK38 CM850 MCRS

The QSK38 series engines, specifically the CM2150 MCRS and CM850 MCRS variants, also utilize this part. These engines are designed for heavy-duty applications, and the screw’s strength and durability make it an ideal choice for securing various components within these robust engines.

QSK50 Engines

• QSK50 CM2150 K107
• QSK50 CM2150 MCRS
• QSK50 CM2350 K108

The QSK50 engines, including the CM2150 K107, CM2150 MCRS, and CM2350 K108 models, are another series where this part is employed. These engines are engineered for high performance and durability, and the screw’s ability to provide a tight and secure fit is crucial for maintaining the integrity of the engine’s assembly.

QSK60 Engines

• QSK60 CM500

The QSK60 CM500 engine also benefits from the use of this part. This engine is designed for demanding applications, and the screw’s high-strength properties ensure reliable fastening in critical engine components.

VTA903 Engines

• VTA903 CM2250 V105

The VTA903 CM2250 V105 engine incorporates this part in its construction. This engine is built for heavy-duty use, and the screw’s design provides the necessary strength and security for its various components.

This part’s compatibility with these Cummins engines underscores its importance in ensuring the reliability and performance of the engine assemblies. Its use across various engine models highlights its versatility and effectiveness in providing secure fastening solutions.

Component Usage

This part is integral to the assembly and functionality of various engine components. It ensures secure fastening and reliable operation across multiple systems.

Base Parts and Engine Installation Kit

In the base parts and engine installation kit, this part is used to fasten critical components securely. This includes mounting the base to the engine frame, ensuring stability and alignment during engine installation.

Belt Shield Mounting and Connection

For the belt shield, the screw is employed to mount the shield securely to the engine, protecting internal components from debris and ensuring the belt operates efficiently without interference.

Water Outlet and Connection

At the water outlet, this part plays a role in securing the water outlet connection to the engine block. This ensures a leak-free seal, maintaining the integrity of the cooling system and preventing coolant loss.

EBM-Pump and Lubricating Oil System

In the EBM-pump and lubricating oil system, the screw is used to fasten the pump housing and various oil passages. This secures the pump to the engine, ensuring efficient oil circulation and lubrication of moving parts.

Filter and Full Flow Oil

For the filter and full flow oil system, the screw is critical in attaching the filter housing to the engine. This ensures the filter is properly seated, allowing for effective filtration of contaminants from the oil.

Guard and Front Engine

On the guard and front engine components, the screw is utilized to secure the guard in place, protecting the front of the engine from external impacts and debris.

Housing and Thermostat

In the housing and thermostat assembly, the screw is employed to fasten the thermostat housing to the engine. This ensures the thermostat operates within its designed parameters, regulating engine temperature effectively.

Injector and On Board Spares

For the injector and on board spares, the screw is used to secure injector components and spare parts in place, ensuring they are readily accessible and properly mounted when needed.

Lubricating Oil Filter Top Level Assembly Head and Pump

In the lubricating oil filter top level assembly head and pump, the screw ensures these components are firmly attached to the engine, maintaining the efficiency of the oil filtration and pump systems.

Thermostat and Support Assembly Housing

Finally, in the thermostat and support assembly housing, the screw is vital for securing the housing to the engine, ensuring the thermostat functions correctly within its housing.

Conclusion

The Twelve Point Cap Screw, Part #205377, is a critical component in the maintenance and operation of commercial trucks. Its unique design, robust construction, and compatibility with various Cummins engines make it an essential fastener for ensuring the reliability and performance of truck components. Proper installation, regular maintenance, and adherence to safety guidelines are crucial for maximizing the lifespan and effectiveness of this part.