OVERVIEW
Genuine VW/Audi N-903-350-06 is an individual clamping washer for the assigned original heat-shield mounting points in the verified applications below. The archive photograph shows the circular bearing surface and star-shaped center gripping features.
Technical details and contents
- Factory part number: N-903-350-06 / N90335006.
- Component type: heat-shield retaining or clamping washer.
- Star-shaped center with inward gripping features.
- Quantity supplied: one individual washer.
- Heat shield, retaining post and other fastening hardware are separate.
This is a formed retainer with a gripping center. It performs a different function from an ordinary flat washer or a threaded hex nut. Select the complete factory number and original retaining-point assignment before ordering.
Function at the heat shield
The retaining washer secures the assigned shield attachment on its original mounting post. Its broad outer surface bears against the retained material while the center engages the intended post. Correct seating helps keep the shield positioned at the mounting point.
Heat-shield assemblies can use several different types of clips, nuts and washers. A part that shares the same vehicle application may belong at a different point. Match this retainer to the original shield and post rather than substituting another nearby fastener.
Common reasons to replace
- The washer is missing following exhaust or underbody service.
- The center gripping features have been distorted during removal.
- The washer no longer retains the shield correctly.
- The retainer is bent, cracked or corroded.
- Incorrect fastening hardware was installed during a previous repair.
Inspect the shield and its mounting post before fitting a replacement. A new washer cannot repair a torn mounting hole, broken post or badly damaged shield. If a rattle remains, inspect the other retaining points and the shield clearance.
Vehicle fitment
The table identifies the verified engine and vehicle configurations. Engine notes matter: a catalog page can show several different retainers for different configurations. Match the original attachment and the full factory number.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Audi A8 Quattro | 2020 | 3.0L turbocharged gasoline V6 plug-in Hybrid | D5 A8 L plug-in Hybrid sedan; 8-speed automatic; quattro | Original assigned heat-shield retaining washer. Match exact shield and retaining post; adjacent threaded nuts and other retainers have different factory numbers. |
| Audi S8 | 2021–2022, 2024–2025 | 4.0L twin-turbocharged gasoline V8 with mild-hybrid system | D5 sedan; 8-speed automatic; quattro | Original assigned heat-shield retaining washer. Match exact shield and retaining post; adjacent threaded nuts and other retainers have different factory numbers. |
| Audi RS Q8 | 2021–2022 | 4.0L twin-turbocharged gasoline V8 with mild-hybrid system | 4M8 SUV; 8-speed automatic; quattro | Original assigned heat-shield retaining washer. Match exact shield and retaining post; adjacent threaded nuts and other retainers have different factory numbers. |
| Audi SQ8 | 2023 | 4.0L twin-turbocharged gasoline V8 | 4M8 SUV; 8-speed automatic; quattro | Original assigned heat-shield retaining washer. Match exact shield and retaining post; adjacent threaded nuts and other retainers have different factory numbers. |
| Audi SQ7 | 2025 | 4.0L twin-turbocharged gasoline V8 | 4M SUV; 8-speed automatic; quattro | Original assigned heat-shield retaining washer. Match exact shield and retaining post; adjacent threaded nuts and other retainers have different factory numbers. |
| Audi Q7 | 2025 | 2.0L turbocharged gasoline inline-four with mild-hybrid system | 4M SUV; 45 TFSI; 8-speed automatic; quattro | Original assigned heat-shield retaining washer. Match exact shield and retaining post; adjacent threaded nuts and other retainers have different factory numbers. |
Installation guidance
Allow the exhaust and surrounding components to cool before working around heat shields. Follow the factory access and support procedure for the exact vehicle and protect nearby lines, wiring and panels during removal.
Align the shield on the original post before fitting the washer. Seat the retainer evenly with the appropriate tool and avoid deforming its center gripping features. Do not force an incorrect retainer onto a damaged post or use it to pull a distorted shield into position.
After assembly, confirm that the shield is secure and that the prescribed clearances are maintained. Do not omit a shield or its other mounting hardware when completing the repair.
Ordering information
This listing supplies one genuine retaining washer. Confirm the required quantity and the condition of all associated mounting points. Exhaust component, heat shield, retaining post, threaded nuts and a complete installation kit are not included.