OVERVIEW
Genuine bolt for the specified A/C line balance-weight repair
WHT-003-121 is the Genuine VW/Audi M6×20 socket-head bolt used to secure the specified A/C refrigerant-line balance weight. Audi bulletin 2056182/4 assigns two of these bolts to the 5Q0820899 weight installation on the RS3 applications below.
The balance-weight repair addresses a confirmed refrigerant-line vibration condition. This listing supplies one mechanical bolt; it does not include the balance weight or a complete A/C repair kit.
Technical details
- Complete factory number: WHT-003-121.
- Factory specification: M6 × 20.
- Design: socket-head mounting bolt.
- Quantity supplied: one individual bolt.
Use the exact bolt and weight combination specified for the repair. The factory instruction for this particular connection calls for medium-strength thread-locking compound and a tightening value of 13 Nm, with a tolerance of ±3 Nm. This value is specific to the balance-weight attachment.
Common reasons to replace
- The bolt is missing from an existing balance-weight installation.
- The drive recess or threads are damaged.
- The head or seating surface is distorted.
- The original attachment needs restoration during A/C line service.
- The specified hardware is needed to complete the confirmed balance-weight repair.
Confirm the source of the noise and inspect the existing balance weight, line and mounting arrangement before replacing hardware. A loose bolt and a missing balance weight are different faults; replacing the bolt alone does not establish the cause of an A/C noise.
Vehicle fitment
The table covers the factory-confirmed balance-weight repair. Use this number at the specified weight attachment rather than assuming it fits every refrigerant-line connection.
| Vehicle | Model years | Engine | Configuration | Application restrictions |
|---|---|---|---|---|
| Audi RS3 | 2017–2020 | 2.5L turbocharged gasoline I5 | 8V sedan; quattro; S tronic; A/C low-side line balance-weight repair | Balance weight 5Q0820899 installation under Audi bulletin 2056182/4; two bolts required per weight, sold individually. |
| Audi RS3 | 2022–2023 | 2.5L turbocharged gasoline I5 | 8Y sedan; quattro; S tronic; A/C low-side line balance-weight repair | Balance weight 5Q0820899 installation under Audi bulletin 2056182/4; two bolts required per weight, sold individually. |
Installation guidance
Follow the current vehicle-specific service instructions and the applicable Audi bulletin for weight position and orientation. Apply the specified medium-strength locking compound and tighten the balance-weight bolts to 13 Nm ±3 Nm. Order two individual bolts when completing one weight installation.
Verify the weight is correctly retained and the line has the required clearance. Confirm the original complaint has been resolved under the operating conditions identified during diagnosis.
Ordering information
One genuine bolt is supplied. The 5Q0820899 balance weight, thread-locking compound, refrigerant line and other hardware are not included. Confirm the original application and required quantity before ordering.