BMW F40 Rear Inner Tailgate Lamp Light Spring Coil Nut 7489902

BMW F40 Rear Inner Tailgate Lamp Light Spring Coil Nut is a precision fastening element from the Rear lights and brake lights group, designed specifically for the rear body section. It is responsible for the stable seating of the lamp in the tailgate, which translates into proper lighting operation and connection tightness. Thanks to its factory origin from the BMW brand, it ensures a proper fit to the tailgate structure and lamp geometry.

Specifications and technical data

• SKU: 7489902
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7489902
• Substitutable numbers: 7489902, 07147489902
• Location on the vehicle: Rear
• Category: Rear Light Assemblies

Purpose and function in the lighting system

The tailgate lamp nut operates in a critical area of the vehicle's rear, where the lamp is exposed to vibrations, temperature changes, and moisture. A properly selected fastening element:

• stabilizes the lamp body relative to the tailgate panel,
• reduces the risk of looseness and unwanted vibrations,
• supports the maintenance of the lamp-to-tailgate connection tightness,
• prevents lamp misalignment that could affect lighting geometry.

Proper mounting is particularly important for components in the Rear lights and brake lights group, as it affects the clarity of light signals and driving safety.

Original BMW origin and fitment

The nut has been developed as a system element for BMW construction, which means maintaining factory dimensional tolerances and compatibility with the threads and sockets used in the tailgate. Thanks to this:

• it fits the intended mounting points without the need for modifications,
• it maintains the appropriate clamping force of the lamp to the panel,
• it reduces the risk of damaging the lamp plastic during tightening.

Such fitment is particularly beneficial for vehicle servicing where maintaining consistency with the original BMW body construction is required.

Performance characteristics of the used element

As an aftermarket element, the nut comes from disassembly, which allows for maintaining compliance with the factory manufacturing standard. A used component of this type is an economical solution while being technically adequate for use in the standard lamp mounting system. In practice, this allows for:

• restoring proper lamp installation after damage or loss of the original nut,
• avoiding problems with undertightening or stripping the thread in the case of non-fitting replacements,
• maintaining material consistency with other fastening elements in the tailgate.

Application in the rear of the vehicle

The nut is intended for installation in the rear body zone, in the tailgate area where the tail lamp assembly is mounted. Placement on the vehicle in the rear section requires an element resistant to:

• constant opening and closing of the tailgate,
• temperature changes in outdoor conditions,
• potential stresses resulting from the operation of hinges and seals.

Selecting the correct nut for the tailgate lamp allows for maintaining the stability of the entire lighting module and reduces the risk of leaks in this area.

Support in selecting lighting and fastening elements

If you are planning a comprehensive repair or upgrade of the rear lighting zone in your BMW and need other elements from the same group, such as lenses, lamp modules, or additional brackets, check the available parts in the BMW Rear lights and brake lights category.

For more extensive work related to lighting, it is also worth familiarizing yourself with practical tips regarding the selection and replacement of headlights and accessories – you will find them in the article See more and better – a complete guide to selecting and replacing used LED and Xenon headlights, which discusses, among other things, the specifics of original BMW components.