# Aluminum Pump Housing Casting Supplier China: Qualification Guide
Pump housing RFQs are not won by the lowest casting price alone. The supplier must understand pressure boundaries, machining datums, leak-test requirements, sealing faces, inspection records, and the buyer's approval path before the quote can be compared fairly.
This guide is for procurement teams, pump engineers, and supplier quality engineers qualifying a China aluminum casting supplier for A356, ZL114, or buyer-specified pump housing programs.
What buyers should verify first
Start with process fit. A pump housing may be gravity cast, low-pressure cast, sand cast, or produced by another route depending on wall thickness, cavity shape, annual volume, pressure requirement, and machining scope. Ask the supplier to explain the route instead of only naming an alloy.
Key checks:
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- •sealed-cavity map and pressure boundary
- •leak-test method, pressure, hold time, and record format
- •machining datums for sealing faces, ports, bores, and O-ring grooves
- •X-ray, CMM, material certificate, and traceability expectations
- •whether vacuum impregnation is prohibited, repair-only, or buyer-approved
- •sample approval path before serial production
Do not compare incomplete quotes
Two suppliers can quote the same drawing with different assumptions. One price may include leak testing and CMM reporting; another may include only raw casting. Ask each supplier to list inclusions and exclusions for tooling, machining, heat treatment, surface treatment, leak testing, inspection records, packaging, and export documentation.
What to send with the RFQ
Send the 2D drawing, STEP model, annual volume, sample quantity, alloy or mechanical requirement, machining scope, leak-test target, inspection record needs, delivery destination, and any existing supplier lessons learned. If the part is already in production, include known leakage, machining, porosity, or assembly concerns.
Bohua RFQ path
Bohua can review aluminum pump housing drawings for casting route, machining scope, leak-test planning, and inspection-record alignment. Use the formal RFQ form when the drawing pack is ready, or start from contact for NDA-first review.
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