OVERVIEW
Genuine VW/Audi internal triple-square bolt, part number N-105-449-04. This original M8 x 55 fastener appears in the specified engine crank-pulley hardware group for the configurations below. Identify the assigned mounting position and original number before ordering.
Technical details
- Original number: N-105-449-04 / N10544904.
- Published nominal size: M8 x 55.
- Internal triple-square drive with a collar beneath the head, as shown in the original photograph.
- One bolt supplied. Pulley, sprockets, washers and other engine hardware are separate.
- This is separate from the large main crankshaft bolt listed in the same catalog group.
The engine hardware group contains fasteners for different mounting functions. This listing identifies the exact M8 x 55 original number so the supplied bolt can be matched to its assigned position. Do not select it as a substitute for another bolt simply because both appear in a crank-pulley diagram.
The original length, head form and drive type matter during component assembly. A matching thread diameter alone does not establish compatibility, and this listing does not supply the main crankshaft bolt or a complete engine attachment kit.
Common reasons to replace
Renew hardware during the relevant engine service when the factory procedure requires replacement after removal. Replace a missing bolt, damaged threads, a rounded drive recess, visible deformation or corrosion affecting reliable installation.
Removal can reveal prior tool damage, incorrect substitute hardware or a damaged mating threaded hole. Inspect the actual component attachment and related hardware before installing the replacement.
Engine noise, drive problems or timing faults require diagnosis of the complete assembly. A new bolt cannot repair a damaged pulley, worn sprocket, defective chain or damaged mating component. Do not use new hardware to conceal an unresolved alignment or component problem.
Installation and service notes
Follow the factory procedure for the exact engine and assigned mounting position. Identify N10544904 in the actual assembly before releasing any hardware. Preserve the required engine timing and component support throughout service.
Use the correct counterholding and positioning tools where the repair procedure requires them. Do not assume that the method for removing the large main crankshaft bolt also applies to this separate M8 fastener.
Prepare the mating surfaces and threads as directed. Align the component correctly, start the bolt by hand and use a correctly fitting triple-square driver fully engaged in the recess.
Apply the prescribed tightening sequence, torque and any required additional angle for the actual connection. Do not infer torque from the M8 x 55 designation or use a specification intended for the main crankshaft bolt.
Follow the required thread treatment and fastener renewal instructions. If the bolt binds or does not seat normally, inspect alignment, hardware selection and mating threads before proceeding.
Complete the required assembly and functional checks after the repair. This listing contains one original fastener; other bolts, washers and components must be selected separately for the actual job.
Fitment
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Volkswagen GTI | 2019–2021 | 2.0L turbocharged TSI gasoline, EA888 Gen 3 | Mk7.5 hatchback, front-wheel drive; 7-speed DSG | Specified M8 x 55 screw in the cataloged engine crank-pulley hardware group. Match N10544904 at the assigned position; separate main crank bolt and other hardware are excluded. |
| Volkswagen Golf R | 2016–2017 | 2.0L turbocharged TSI gasoline, CYFB | Mk7 hatchback, 4Motion; 6-speed manual | Specified M8 x 55 screw in the cataloged engine crank-pulley hardware group. Match N10544904 at the assigned position; separate main crank bolt and other hardware are excluded. |
Confirm the original M8 bolt number and assigned engine attachment before ordering. One bolt supplied.