Expansion Tank for Audi A4: Carbon Steel
This expansion tank for the Audi A4 is specified around carbon steel, which decides how it behaves in service far more than the part name does. We build to a written specification — base material, dimensions, finish and packing — and hold that specification on file so every reorder reproduces the approved piece.
The usual reason a programme changes supplier is not unit price. It is premature wear on the first batch, or lead time that slipped twice before bulk started. Both are specification problems, and both are preventable.
Specification
| Product | Expansion Tank |
|---|---|
| Vehicle application | Audi A4 |
| Material / finish | Carbon Steel |
| Typical use | Mountain Roads |
| MOQ | 2,000 pieces per specification |
| Sampling | 10 working days, 3 days per revision |
| Bulk lead time | 20-40 days after approval |
| Compliance | IATF 16949 |
| Packing | 20 pieces per inner box, 200 per carton |
Material options
- Semi-Metallic Compound — preferred when weight matters more than rigidity
- PVC Coated Fabric — specified where the part sits close to a heat source
- Polypropylene — selected when the part is exposed to weather and road salt
- Carbon Steel — the cost-effective default for volume programmes
- Sintered Metal — selected when the part is exposed to weather and road salt
Processes available
- cold forging
- surface grinding
- shot blasting
- precision stamping
- electroplating
- assembly line testing
Fitment notes
Keep the old part until the new one is on the bench. Comparing them side by side settles questions a photograph never will.
Where it is used
The specification above is the one most often ordered for mountain roads. Related applications include airport ground fleets, night riding, coastal delivery, long-distance touring, daily commuting.
Quality and packing
- In-line inspection with AQL 4.0 sampling on every lot.
- Dimensional report issued against the approved drawing.
- Carton marking and barcode to your specification.
- Golden sample retained at the factory as the reorder reference.
Questions buyers ask
What testing is included?
Standard lots ship with dimensional and hardness reports. IATF 16949 documentation is issued with the shipment when your market requires it.
Can the specification be held on file?
Yes. Once approved, the specification is recorded against your part number so a reorder reproduces the IATF 16949-compliant build instead of a fresh interpretation.
Can you match an existing sample?
Send a sample and we will reverse-engineer the specification, then produce a counter sample for approval before any bulk starts.
Do you handle mixed containers?
Yes. Most programmes consolidate several part numbers into one container to keep freight sensible at 2000 pieces per line.
Ask for the current catalogue and the specification sheet for this line.
