Leaf Spring for Audi A4: Polypropylene
This leaf spring for the Audi A4 is specified around polypropylene, 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 reorders that did not match the approved sample, or inconsistent hardness between lots. Both are specification problems, and both are preventable.
Specification
| Product | Leaf Spring |
|---|---|
| Vehicle application | Audi A4 |
| Material / finish | Polypropylene |
| Typical use | Track Days |
| MOQ | 1,000 pieces per specification |
| Sampling | 10 working days, 3 days per revision |
| Bulk lead time | 25-30 days after approval |
| Compliance | ISO/TS 16949 |
| Packing | 100 pieces per inner box, 500 per carton |
Material options
- Nylon 66 — used when the finish has to hold a coating
- Carbon Fibre Composite — used when the finish has to hold a coating
- Forged Aluminium — chosen where wear resistance comes first
- High Density Foam — the cost-effective default for volume programmes
- Powder Coated Steel — selected when the part is exposed to weather and road salt
Processes available
- CNC machining
- anodising
- gravity casting
- cold forging
- sintering
- electroplating
Fitment notes
Check whether the mounting points on your market version match the catalogue drawing — regional variants are the usual cause of a wrong first order.
Where it is used
The specification above is the one most often ordered for track days. Related applications include mountain roads, urban courier work, food delivery, ride-hailing fleets, coastal delivery.
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
How long does sampling take?
Samples leave the factory in 10 working days, and each revision round adds about 3 days once you have seen the first piece.
Do you handle mixed containers?
Yes. Most programmes consolidate several part numbers into one container to keep freight sensible at 1000 pieces per line.
What is the minimum order quantity?
The standard MOQ is 1000 pieces per specification. Mixed sizes inside one shipment are accepted once the total reaches that figure.
How is packing specified?
Individual packing, inner box quantity and carton marking are confirmed at quotation stage so the cartons arrive ready for your warehouse.
Send the specification you are working to and we will confirm what we can match, what we would change and why.
