Mercedes W639 Rear Tailgate Lock Cylinder Catch Barrel A6397600005

The Mercedes W639 Tailgate Lock Cylinder is a precision component from the Locks and Latches group, designed for installation at the rear of the vehicle body. It is responsible for securely locking the tailgate, ensuring a safe closure and stable operation of the entire lock mechanism. This technical solution is dedicated to users who expect the tailgate of their Mercedes to function flawlessly.

Specifications and technical data

• SKU: A6397600005
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6397600005
• Substitutable numbers: A6397600005, A 639 760 00 05
• Location on the vehicle: Rear
• Category: Exterior Locks & Lock Hardware

Purpose and Function of the Tailgate Lock Cylinder

The presented lock cylinder is designed for installation in the tailgate area of W639 series models. Its function is to cooperate with the latching mechanism, ensuring that the tailgate closes repeatedly and stably. A correctly selected cylinder reduces the risk of play, closure problems, and unintended tailgate opening while driving.

This component is part of the system responsible for:

• mechanical latching of the tailgate,
• transferring motion from the key or cylinder to the lock mechanism,
• maintaining the correct position of the tailgate relative to the body after closing.

Benefits of Using an Original Lock Cylinder

Using a lock cylinder dedicated to the W639 series allows for maintaining factory fitment with the tailgate's construction. The appropriate geometry and mounting method facilitate installation and reduce the need for additional modifications. As a result, the lock mechanism operates predictably, and the tailgate maintains its proper alignment with the vehicle body.

The main advantages of this solution include:

• compatibility with the factory latching mechanism,
• stable operation during daily vehicle use,
• the ability to restore proper tailgate function after a failure or wear of the previous component.

Installation and Operational Characteristics

The tailgate lock cylinder in the Mercedes W639 is a component installed in the rear of the vehicle, in direct proximity to the lock mechanism. Its design anticipates cooperation with the existing tailgate installation, which facilitates servicing and replacement in workshop conditions. With correct installation, it is possible to restore proper latching without interfering with other tailgate components.

Due to its location, the cylinder operates in varying atmospheric conditions, making it important to maintain adequate sealing and correct seating in the tailgate. A properly selected component helps to limit moisture ingress into the mechanism, promoting longer and more predictable operation.

Application in the Locks and Latches System

As part of the Locks and Latches group, the tailgate lock cylinder contributes to the complete vehicle body security system. In conjunction with other door lock and tailgate components, it ensures cohesive operation of the entire latching system. This is particularly important in vehicles used intensively, where regular opening and closing of the tailgate requires efficient and repeatable mechanism performance.

If you are planning a comprehensive repair or upgrade of the body lock area in your Mercedes and need other parts from the same group, such as cylinders, latches, or handle mechanisms, check the available parts in the Mercedes Locks and Latches category.

Additional Information and Parts Selection

When selecting a tailgate lock cylinder for the Mercedes W639, it is crucial to compare its technical parameters with the currently installed component and verify its compatibility with the vehicle's documentation. The product has assigned manufacturer designations and interchangeable numbers, which facilitate unambiguous identification in parts catalogs.

For users interested in the broader context of using aftermarket parts in vehicles of other brands, an article describing the practical aspects of selecting and installing used components may be helpful – you can find it here: when used VW parts are a sensible choice.