Coil Spring for BMW X5: Carbon Steel
This coil spring for the BMW X5 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 lead time that slipped twice before bulk started, or inconsistent hardness between lots. Both are specification problems, and both are preventable.
Specification
| Product | Coil Spring |
|---|---|
| Vehicle application | BMW X5 |
| Material / finish | Carbon Steel |
| Typical use | Track Days |
| MOQ | 3,000 pieces per specification |
| Sampling | 10 working days, 5 days per revision |
| Bulk lead time | 15-30 days after approval |
| Compliance | ECE R90 |
| Packing | 20 pieces per inner box, 200 per carton |
Material options
- Kevlar Composite — specified where the part sits close to a heat source
- Carbon Fibre Composite — selected when the part is exposed to weather and road salt
- High Density Foam — used when the finish has to hold a coating
- Polypropylene — used when the finish has to hold a coating
- Tempered Glass — preferred when weight matters more than rigidity
Processes available
- gravity casting
- sintering
- injection moulding
- robot welding
- surface grinding
- laser cutting
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 heavy load hauling, mountain roads, airport ground fleets, food delivery, off-road trails.
Quality and packing
- In-line inspection with AQL 1.5 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
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 is packing specified?
Individual packing, inner box quantity and carton marking are confirmed at quotation stage so the cartons arrive ready for your warehouse.
Can the specification be held on file?
Yes. Once approved, the specification is recorded against your part number so a reorder reproduces the ECE R90-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.
Share a sample or a drawing and we will quote against a written specification, not against a photograph.
