Buyer note: confirm assumptions before quoting
Lead time, MOQ, yield, leak-test scope, machining scope, and landed cost depend on the drawing, alloy, inspection plan, annual volume, and destination market. For current supplier facts, review the supplier capability sheet or send an RFQ package.
# How to Qualify an Aluminum Pump Housing Casting Supplier in China
Pump housing RFQs usually fail when the buyer compares suppliers on casting weight and headline price before defining leak-test, machining, and inspection scope. A useful supplier screen should show whether the supplier can review A356 or ZL114 route fit, sealing faces, CNC datums, leak-test assumptions, and documentation before tooling is quoted.
This checklist is written for procurement, SQE, and engineering teams sourcing aluminum pump housings from China. It avoids generic capability claims and focuses on what the buyer should ask for in the RFQ.
Why pump housing RFQs need a tighter qualification path
Pump housings often combine several approval risks in one part:
- •pressure or sealing requirements
- •ports, bores, threads, and gasket faces after machining
- •casting sections where porosity or shrinkage may be exposed by CNC work
- •material and heat-treatment assumptions, often A356-T6 or ZL114
- •leak-test records, CMM reports, material certificates, FAI, or PPAP-style documentation
- •export packaging and repeat supply expectations
A supplier can only quote these risks clearly when the drawing package and inspection scope are visible. If the RFQ only says "pump housing quote," suppliers may include very different assumptions.
1. Confirm the casting route before comparing price
Ask whether the supplier recommends gravity casting, low-pressure casting, die casting, sand casting, or another route for the specific drawing. The useful answer should explain:
- •wall thickness and feeding risk
- •sealing faces and machining allowance
- •whether A356-T6, ZL114, ADC12, or another alloy is being assumed
- •whether the process can support the required inspection records
- •what still needs buyer confirmation before tooling starts
Do not treat A356 and ADC12 as simple price substitutes. A pressure-sensitive pump body with machined sealing faces may need a different route than a thin non-pressure cover.
2. Define leak-test scope as an RFQ input
For pump housings, "leak test required" is not enough. Ask suppliers to quote with these fields visible:
| Field | What to send |
|---|---|
| Test method | air, water, pressure decay, helium, or buyer-owned method |
| Test medium | the medium used during supplier-side inspection, if known |
| Pressure | test pressure or a preliminary target range |
| Hold time | required hold time or buyer standard reference |
| Acceptance | leak rate, pressure drop, visible leakage rule, or specification |
| Timing | before machining, after machining, or both during validation |
| Sampling | first article, each batch, each cavity, or agreed production sampling |
| Records | report format, traceability fields, and retention expectation |
If the final customer specification is not frozen, mark it as preliminary. The quote can still separate fixed assumptions from items that may change.
3. Ask how machining datums affect the casting quote
Pump housing cost often moves after the casting quote because CNC assumptions were not clear. Ask for a quote that separates:
- •raw casting supply
- •heat-treatment scope if required
- •machining fixture or datum strategy
- •ports, bores, threads, sealing faces, O-ring grooves, and gasket lands
- •CMM or gauge records
- •surface finish and coating requirements
- •packaging for machined faces
For drawing-ready buyers, use the A356-T6 pressure-tight pump housing RFQ route. If the buyer is still organizing files, use the pump casing product-to-RFQ guide.
4. Request quality evidence by project, not as a slogan
A supplier qualification package should be tied to the part category being quoted. For pump housings, useful evidence can include:
- •current quality-system certificate and certified scope
- •material certificate example for the relevant alloy family
- •CMM report example for machined datum features
- •leak-test report format and traceability fields
- •X-ray, section, or other inspection plan if required by the drawing
- •FAI or PPAP checklist when the buyer requires approval documentation
- •corrective-action process and nonconformance communication path
RFQ CTA
Have a casting project? Upload your drawing for a fast, structured quote review.
Send the drawing, target alloy, finishing scope, MOQ, and delivery timing. Bohua will review it like a real sourcing project, not a generic contact request.
Avoid accepting broad claims such as universal leak-risk-controlled production, fixed yield, fixed lead time, or customer names without buyer-approved evidence.
5. Separate new-tool, transfer-tool, and second-source logic
A new-tool pump housing quote is different from a transfer-tool or second-source quote. Ask the supplier to state which path is being quoted:
- •New tooling built around the supplier's casting process
- •Duplicate tooling based on existing approved geometry
- •Transfer tooling that may need inspection, repair, or process adjustment
- •Prototype-to-production route where the buyer still expects design changes
- •Second-source route where interchangeability and approval evidence matter
For backup supplier work, pair this page with the second-source casting RFQ route.
6. Build a supplier comparison table
When comparing pump housing suppliers, put assumptions side by side:
| Comparison item | Supplier A | Supplier B | Supplier C |
|---|---|---|---|
| Alloy and temper | |||
| Casting process | |||
| Leak-test method and timing | |||
| CNC scope included | |||
| CMM or gauge records included | |||
| Tooling ownership and correction loop | |||
| FAI or PPAP documentation | |||
| Packaging and Incoterm | |||
| Open assumptions |
This makes a lower quote easier to audit. It may be lower because the supplier is efficient, or because machining fixtures, leak-test records, or documentation were not included.
Copy-paste RFQ starter
> Pump housing casting and CNC RFQ
> Files: 2D PDF revision __, STEP __, NDA-first review yes/no __
> Part family: pump housing / pump casing / fluid housing / pressure-sensitive cover
> Alloy target: A356-T6 / ZL114 / ADC12 / supplier recommendation
> Process target: gravity casting / low-pressure casting / die casting / supplier recommendation
> Critical features: sealing faces __, ports __, bores __, threads __, O-ring grooves __
> Leak-test requirement: method __, pressure __, hold time __, acceptance __, sampling __
> Machining scope: raw casting only / casting plus CNC / supplier to quote both options
> Inspection records: CMM __, material certificate __, leak-test record __, X-ray or section check __, FAI/PPAP-style __
> Tooling status: new tool / duplicate tool / transfer tool / unknown
> Quantity: prototype __, annual volume __
> Destination and Incoterm: __
> Contact path: submit the site RFQ first; use email only for follow-up attachments after submission
FAQ
What should buyers send first for a pump housing quote?
Send the drawing package, alloy target if known, machining scope, leak-test expectation, annual volume, tooling status, inspection records needed, and destination or Incoterm assumptions.
Is A356-T6 always the right alloy for pump housings?
No. A356-T6 is common for many structural or pressure-sensitive casting discussions, but the right alloy depends on wall thickness, pressure or sealing need, corrosion exposure, machining stock, heat-treatment requirement, and cost target.
Should leak testing happen before or after machining?
It depends on the risk. Some programs test after machining because ports and sealing faces expose the final leak path. Some validation plans use both pre-machining and post-machining checks. State the expected timing in the RFQ.
Which Bohua path should I use after this checklist?
Use the A356-T6 pressure-tight pump housing RFQ route when leak-test criteria and CNC datums drive the quote. Use the pump housing OEM quote route for broader tooling, MOQ, and commercial review. Use the request quote form when drawings are ready.
Project CTA
Need a Reliable Pump Housing Supplier?
Send your drawing for a structured DFM review, quote scope, and project-specific timing discussion.