Car Alternator for BMW 3 Series: Polypropylene
This car alternator for the BMW 3 Series 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 documentation that arrived after the container shipped, or documentation that arrived after the container shipped. Both are specification problems, and both are preventable.
Specification
| Product | Car Alternator |
|---|---|
| Vehicle application | BMW 3 Series |
| Material / finish | Polypropylene |
| Typical use | Night Riding |
| MOQ | 1,000 pieces per specification |
| Sampling | 10 working days, 3 days per revision |
| Bulk lead time | 15-40 days after approval |
| Compliance | SAE J431 |
| Packing | 10 pieces per inner box, 1000 per carton |
Material options
- Cast Iron — selected when the part is exposed to weather and road salt
- EPDM Rubber — used when the finish has to hold a coating
- High Density Foam — chosen where wear resistance comes first
- Stainless Steel — preferred when weight matters more than rigidity
- Reinforced Nylon — preferred when weight matters more than rigidity
Processes available
- injection moulding
- shot blasting
- CNC machining
- ultrasonic cleaning
- sintering
- precision stamping
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 night riding. Related applications include heavy load hauling, night riding, ride-hailing fleets, wet weather riding, roadside assistance.
Quality and packing
- In-line inspection with AQL 2.5 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
Can the specification be held on file?
Yes. Once approved, the specification is recorded against your part number so a reorder reproduces the SAE J431-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.
What testing is included?
Standard lots ship with dimensional and hardness reports. SAE J431 documentation is issued with the shipment when your market requires it.
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.
Tell us the model, the fitment and the quantity and we will hold a production slot for you.
