OVERVIEW
Correct hardware for the assigned factory attachment
Genuine VW/Audi N-090-242-4 secures the designated mounting point in the listed coolant-system or propeller-shaft assembly. The installation location differs by vehicle and is identified in the fitment table. The hexagonal head and integrated bearing face provide the original style of fastening interface.
This small fastener is supplied individually. Its thread, length and seating arrangement must agree with the original joint; it is separate from the pipe, bracket, seals and coolant.
Technical details
- Complete factory number: N-090-242-4.
- Factory specification: M6 × 18 hexagon head combination bolt, factory number N-090-242-4.
- Design: threaded metal bolt with external hexagonal drive and broad bearing surface beneath the head.
- Quantity supplied: one individual combination head bolt.
Use the complete factory number to distinguish this fastener from similar M6 hardware. Correct length and bearing geometry help the joint clamp as intended without bottoming out or interfering with nearby components. No unsupported material grade or general tightening torque is assigned.
Common reasons to replace
- The original bolt is missing from the assigned mounting point.
- The hexagonal drive or thread is damaged.
- Corrosion or deformation prevents the bolt from seating and tightening correctly.
Inspect the mating thread, mounting bracket and seating face before fitting the replacement. A bolt cannot repair a cracked pipe, damaged mounting lug or stripped receiving thread.
Vehicle fitment
Match the platform and assigned original mounting arrangement in the table. Two A5 generations overlap in the listed model year, so the platform distinction is essential.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Audi A5 | 2025 | 2.0L turbo gasoline | B10 / PPC sedan, quattro; matching new-generation coolant pipe assembly | Engine water pump outlet/coolant pipe mounting bolt, center/front assigned position. Excludes carryover B9 Sportback unless its original catalog separately specifies this exact number. |
| Audi R8 | 2012, 2014–2015 | 5.2L V10 gasoline; TK7 | Type 42; quattro; original auxiliary coolant-pump mounting | Coolant-system bolt position 31 at the original auxiliary pump installation; match original full number and mounting arrangement. |
| Volkswagen Touareg | 2013–2014 | 3.6L VR6 gasoline; CGRA | 7P; 4MOTION; original propeller-shaft assembly hardware | Assigned M6 × 18 bolt position 11 in original propeller-shaft assembly; not an axle-to-hub bolt. Match original joint and full number. |
Installation guidance
Follow the factory procedure for the exact assembly and mounting point. For coolant-system work, allow the engine to cool. For propeller-shaft assembly work, support the vehicle and affected components as specified and follow the original hardware sequence. Position the pipe and bracket without strain, start the bolt by hand to protect the receiving thread and tighten it to the repair specification for that exact fastening point.
Confirm that the pipe is supported correctly and does not contact nearby components. If the coolant circuit was opened, renew required seals, refill and bleed it as specified and complete the prescribed leak checks.
Ordering information
One individual Genuine VW/Audi N-090-242-4 bolt is supplied. Verify the full part number, original mounting position and required quantity before ordering.