Audi A6 C8 Rear Seat Belt Buckle Latch Catch Right O/S 4K8857740AD

Audi A6 C8 Rear Seat Belt Buckle Latch Catch Right O/S is an original component from the Seat belts and parts group, designed for installation on the rear right side of the vehicle. It ensures precise interaction with the factory seat belt, resulting in stable fastening and predictable behavior of the safety system during daily use.

Specifications and technical data

• SKU: 4K8857740AD
• Mark: Audi
• Condition: Used
• OEM Part Number: 4K8857740AD
• Substitutable numbers: 4K8857740AD, 4K8 857 740 AD
• Location on the vehicle: Rear, Right
• Part type: Seat Belt
• Category: Seat Belts & Parts

Purpose and function in the safety system

The rear right seat belt buckle in the Audi A6 C8 is responsible for the mechanical latching and retention of the belt in the correct position relative to the seat and the vehicle body. This component works in conjunction with the pretensioner and the belt, creating a cohesive passenger protection system for the rear right seat. A properly selected buckle minimizes the risk of slack, accidental release, and incorrect belt webbing guidance during driving and in emergency situations.

Compatibility and fit for Audi A6 C8

The offered buckle has been designed specifically for the Audi A6 C8 generation body, taking into account the geometry of the rear seat, mounting points, and installation routing. The vehicle location specified as rear – right side allows for clear identification of its mounting position and helps avoid errors when selecting parts. This ensures that the factory fitment with upholstery, belt guides, and interior structural elements is maintained.

Technical and performance characteristics

The seat belt buckle belongs to a group of components with high durability requirements, which is why the construction is based on a solid metal body with appropriately selected materials in the contact zone with the belt tongue. The locking mechanism has been designed to ensure:

• secure latching of the belt tongue with one firm movement,
• controlled release upon pressing the button,
• stable load retention along the belt axis during sudden braking. The placement of the mounting point relative to the seat and the vehicle floor is optimized for user ergonomics, which facilitates quick buckling for both adult passengers and when installing a child seat using the belt.

Condition of the component and benefits of choosing an original part

The presented buckle is an original Audi brand component in used condition, which means it comes from vehicle dismantling and retains the factory design specifications. In practice, this translates into:

• compatibility with factory mounting points and vehicle installation,
• no need for adaptation or modifications during installation,
• consistency with other safety system components in the Audi A6 C8. For many users, choosing an original, used buckle is a reasonable compromise between repair costs and maintaining the safety parameters intended by the vehicle manufacturer.

Safety, installation, and good service practices

When replacing a seat belt buckle, it is recommended that installation work be performed by a person with experience in handling passive safety systems. Correct tightening of the mounting point, proper routing of wiring (if applicable), and checking the operation of the latching mechanism after installation are crucial for maintaining the functionality of the entire system. After installation, it is worth checking several times:

• whether the belt tongue locks into the buckle without resistance,
• whether the release button operates smoothly,
• whether the buckle has excessive play relative to the seat. Such an approach allows for maintaining a high level of safety for rear seat passengers and limiting the risk of system malfunction in critical situations. If you are planning a comprehensive repair or upgrade of the rear passenger safety zone in your Audi and need other elements from the same group, such as pretensioners, belt webbing, or additional mounts, check the available parts in the Audi seat belts and parts category. For drivers who want to better understand the importance of original components in the context of safety and durability, the article discussing how used OEM elements affect vehicle operation will be helpful – you can find it here: Quality assurance and OEM safety – why are used original car parts the best choice for your car?. If you are interested in a broader context of using used parts for sports car modifications, it is also worth reading the material dedicated to the MINI brand and the John Cooper Works version: MINI John Cooper Works – what makes it stand out and how to improve your MINI?.