Expansion Tank for BMW X5: Magnesium Alloy
This expansion tank for the BMW X5 is specified around magnesium alloy, 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 inconsistent hardness between lots, or a specification nobody had written down. Both are specification problems, and both are preventable.
Specification
| Product | Expansion Tank |
|---|---|
| Vehicle application | BMW X5 |
| Material / finish | Magnesium Alloy |
| Typical use | Track Days |
| MOQ | 500 pieces per specification |
| Sampling | 10 working days, 3 days per revision |
| Bulk lead time | 15-40 days after approval |
| Compliance | DOT |
| Packing | 20 pieces per inner box, 500 per carton |
Material options
- Magnesium Alloy — chosen where wear resistance comes first
- PU Leather — chosen where wear resistance comes first
- Semi-Metallic Compound — specified where the part sits close to a heat source
- Forged Aluminium — used when the finish has to hold a coating
- Brass — specified where the part sits close to a heat source
Processes available
- sintering
- injection moulding
- anodising
- cold forging
- heat treatment
- assembly line testing
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 track days. Related applications include off-road trails, passenger transport, delivery fleets, mountain roads, ride-hailing fleets.
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
Can the specification be held on file?
Yes. Once approved, the specification is recorded against your part number so a reorder reproduces the DOT-compliant build instead of a fresh interpretation.
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.
What testing is included?
Standard lots ship with dimensional and hardness reports. DOT documentation is issued with the shipment when your market requires it.
What is the minimum order quantity?
The standard MOQ is 500 pieces per specification. Mixed sizes inside one shipment are accepted once the total reaches that figure.
Send the part number, the annual volume and the target market, and we will come back with a specification and a sampling plan.
