OVERVIEW
Original socket head fastening hardware
The N-014-721-8 Genuine VW/Audi socket head bolt uses an internal hex drive and the original M10x25 specification. The confirmed applications below identify an original engine cooling assembly fastening position on the TTS with the CDMA engine and the listed front-wheel-drive TT auxiliary coolant-pump bracket. This standard fastener is position-specific: confirm the exact original number rather than applying it to every attachment on the vehicle.
Technical details
- Original number: N-014-721-8 / N0147218.
- Specification: M10 nominal thread diameter and 25 mm specified length.
- Head: cylindrical socket head with an internal hex drive.
- Confirmed position: original cooling assembly bolt attachment identified in the fitment table.
- Quantity: one bolt. Brackets, cooling components, washers and additional hardware are separate.
The intended engagement length and head seating geometry must match the original attachment. A different M10 bolt can enter the same threaded hole yet provide the wrong length or bearing arrangement. Match the complete original specification and the hardware shown for the serviced position.
Common reasons to replace
- Rounded drive recess: internal hex damage can prevent controlled removal or tightening.
- Damaged threads: cross-threading or previous service damage can impair secure installation.
- Corrosion or seizure: a deteriorated fastener can be difficult to remove during component service.
- Missing or incorrect hardware: restore the intended original mounting arrangement.
- Associated component service: inspect the bolt when the corresponding cooling assembly attachment is removed.
A loose bracket or coolant-related fault requires diagnosis of the complete assembly. This bolt is mounting hardware; it does not replace a seal, hose, pump or damaged bracket. Inspect the receiving threads and the attached components before choosing the parts required for the repair.
Fitment data sheet
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Audi TTS | 2010–2014 | 2.0L turbo FSI gasoline; CDMA | 8J Coupe; quattro; 6-speed S tronic; original engine cooling assembly attachment | Original cooling assembly socket bolt position specifying N-014-721-8; position 41 in the corresponding original diagram. Confirm the engine code, diagram and attachment; other bolt positions can differ. |
| Audi TTS | 2010–2014 | 2.0L turbo FSI gasoline; CDMA | 8J Roadster; quattro; 6-speed S tronic; original engine cooling assembly attachment | Original cooling assembly socket bolt position specifying N-014-721-8; position 41 in the corresponding original diagram. Confirm the engine code, diagram and attachment; other bolt positions can differ. |
| Audi TT | 2009 | 2.0L turbo FSI gasoline; original timing-belt engine | 8J Coupe; front-wheel drive; S tronic; original auxiliary coolant-pump bracket | Auxiliary water-pump bracket mounting bolt, selected 2009 without-AWD diagram position 4. Excludes quattro arrangement using different bracket mounting hardware; confirm original bracket and bolt. |
| Audi TT | 2009 | 2.0L turbo FSI gasoline; original timing-belt engine | 8J Roadster; front-wheel drive; S tronic; original auxiliary coolant-pump bracket | Auxiliary water-pump bracket mounting bolt, selected 2009 without-AWD diagram position 4. Excludes quattro arrangement using different bracket mounting hardware; confirm original bracket and bolt. |
Installation and ordering guidance
Confirm the vehicle identification number and CDMA engine code, then match the original cooling assembly diagram and bolt position. Similar socket bolts can appear in the same assembly with different lengths. Count the bolts required at the actual serviced positions and order accompanying hardware separately.
Allow the engine to cool before working around the cooling system. Follow the relevant component removal procedure and inspect the mating mounting surfaces and receiving threads. Start the bolt without cross-threading, seat the attached component in its original position and follow the factory tightening sequence for that attachment.
Use the specified torque and any required thread treatment from the repair procedure; neither is established solely by the bolt diameter. If cooling components are removed, complete the prescribed refilling, bleeding and leak checks as part of the repair. Verify the repaired mounting connection is securely seated before returning the vehicle to service.