Coil Spring for Audi A4: Sintered Metal
This coil spring for the Audi A4 is specified around sintered metal, 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 packing that arrived crushed at the port, or lead time that slipped twice before bulk started. Both are specification problems, and both are preventable.
Specification
| Product | Coil Spring |
|---|---|
| Vehicle application | Audi A4 |
| Material / finish | Sintered Metal |
| Typical use | Security Patrols |
| MOQ | 3,000 pieces per specification |
| Sampling | 7 working days, 3 days per revision |
| Bulk lead time | 15-30 days after approval |
| Compliance | IATF 16949 |
| Packing | 50 pieces per inner box, 200 per carton |
Material options
- ABS Plastic — selected when the part is exposed to weather and road salt
- Kevlar Composite — specified where the part sits close to a heat source
- Chromed Steel — chosen where wear resistance comes first
- Silicone — the cost-effective default for volume programmes
- Natural Rubber — the cost-effective default for volume programmes
Processes available
- heat treatment
- laser cutting
- ultrasonic cleaning
- die casting
- assembly line testing
- robot welding
Fitment notes
Confirm the fitment against the VIN or the frame number before ordering; two model years often share a name and not a part.
Where it is used
The specification above is the one most often ordered for security patrols. Related applications include farm use, food delivery, heavy load hauling, rural transport, mountain roads.
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
Do you handle mixed containers?
Yes. Most programmes consolidate several part numbers into one container to keep freight sensible at 3000 pieces per line.
How long does sampling take?
Samples leave the factory in 7 working days, and each revision round adds about 3 days once you have seen the first piece.
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.
Send the part number, the annual volume and the target market, and we will come back with a specification and a sampling plan.
