Expansion Tank for Geely Coolray: Magnesium Alloy
This expansion tank for the Geely Coolray 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 reorders that did not match the approved sample, or a specification nobody had written down. Both are specification problems, and both are preventable.

Specification
| Product | Expansion Tank |
|---|---|
| Vehicle application | Geely Coolray |
| Material / finish | Magnesium Alloy |
| Typical use | Off-Road Trails |
| MOQ | 500 pieces per specification |
| Sampling | 14 working days, 5 days per revision |
| Bulk lead time | 20-30 days after approval |
| Compliance | SAE J431 |
| Packing | 50 pieces per inner box, 200 per carton |
Material options
- Cast Iron — selected when the part is exposed to weather and road salt
- Nylon 66 — selected when the part is exposed to weather and road salt
- Silicone — chosen where wear resistance comes first
- PU Leather — the cost-effective default for volume programmes
- Ceramic Composite — the cost-effective default for volume programmes

Processes available
- die casting
- robot welding
- electroplating
- CNC machining
- assembly line testing
- sintering
Fitment notes
Keep the old part until the new one is on the bench. Comparing them side by side settles questions a photograph never will.
Where it is used
The specification above is the one most often ordered for off-road trails. Related applications include farm use, night riding, heavy load hauling, delivery fleets, rental fleets.
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 500 pieces per line.
What happens if a lot fails inspection?
The lot is re-inspected against the golden sample, and replacement pieces ship on the next available booking at our cost.
How long does sampling take?
Samples leave the factory in 14 working days, and each revision round adds about 5 days once you have seen the first piece.
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.
Share a sample or a drawing and we will quote against a written specification, not against a photograph.







