Pump housing quotes often focus on "pressure-tight" and leak testing, but many pump programs fail at assembly because bearing seats and shaft/seal bores were never defined in a quoteable way. Different suppliers assume different machining plans, different datums, and different inspection evidence — and the differences only show up when the bearing presses in crooked, the shaft runout is out of control, or the seal interface leaks.
This checklist helps procurement + SQE teams write a pump housing RFQ that makes bearing-seat and runout requirements visible in the quote.
Useful Bohua routes:
- •Pump housing manufacturer page
- •Pump housing application overview
- •Pump housing OEM quote route
- •A356 pressure-tight pump housing RFQ route
- •Structured RFQ upload
1) Identify which bores are functional (do not treat "bore" as one thing)
In the RFQ, list each functional bore group separately:
- •bearing seat(s)
- •shaft seal bore(s) / seal land(s)
- •impeller or rotor locating bore(s)
- •pilot bores used for assembly alignment
If the drawing is complex, add a one-page "critical feature map" that labels each bore group and which stage controls it (as-cast vs machined).
2) State the datum scheme used for machining and inspection
Bearing-seat and runout requirements only make sense relative to datums.
In the RFQ, specify:
- •primary datum (often a mounting face or reference face)
- •secondary datum (often a locating bore or pilot)
- •tertiary datum (anti-rotation or second face)
If your drawing already defines A/B/C, call out that CMM reports must reference those datums. If you do not know the best datum scheme, ask the supplier to propose one and list it as a quote assumption.
3) Concentricity / runout requirements: make them quoteable
Teams often write "runout tight" without saying what is measured. In the RFQ, define:
- •feature: which bearing seat / seal bore
- •reference: runout relative to which datum axis
- •measurement method: CMM vs roundness tester vs air gauge + spindle fixture (supplier-proposed is acceptable if disclosed)
- •acceptance stage: after final machining (recommended for final acceptance)
If you cannot define numeric values yet, require the supplier to propose values and document them in the quote assumptions.
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.
4) Machining scope + stock allowance (so suppliers quote the same risk)
For bearing-seat stability, define:
- •which bores are fully machined vs partially cleaned up
- •whether honing/reaming is required
- •whether heat treatment happens before/after critical machining (distortion risk)
- •stock allowance assumptions (if your program has a preference)
If you need A356-T6, state whether the bearing seats are finished after T6 (common when distortion matters).
5) Inspection evidence: what records should ship with samples
For bearing-seat / runout risk, request at least one of:
- •CMM report covering datum scheme + bore size + positional relationships
- •air-gauge record for bearing seats (if used)
- •roundness / cylindricity report when required by your design
- •gage R&R / MSA evidence if your approval system requires it
State whether you want first-article (FAI) records only, or ongoing sampling records for production.
6) Assembly context (so the supplier understands why you care)
Include:
- •bearing type (ball/roller/bushing) and fit (interference/clearance)
- •whether press-fit force or insertion behavior is critical
- •seal type and sensitivity (lip seal vs mechanical seal)
- •operating speed and any noise/vibration sensitivity notes
Even a short note helps suppliers avoid quoting the wrong machining and inspection plan.
Copy-paste RFQ starter (bearing seat + runout)
> Pump housing bearing-seat RFQ (copy-paste)
> Files: 2D PDF rev __ ; STEP __
> Functional bores: bearing seat __ ; seal bore __ ; pilot/locating bores __
> Datums: A __ ; B __ ; C __ (CMM report must reference these)
> Runout / concentricity: feature __ ; relative to datum axis __ ; acceptance after final machining yes/no __
> Machining scope: bores to be finished __ ; honing/reaming yes/no __ ; heat treat stage vs machining __
> Inspection records requested: CMM __ ; air-gauge __ ; roundness/cylindricity __ ; material cert __ ; traceability fields __
> Quantity + schedule: prototype __ ; annual volume __ ; timing __ ; destination + Incoterm __
Submit a structured RFQ (drawing-ready)
Project CTA
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