Essential Questions for Sourcing Aluminum Die Casting Parts

Before issuing an RFQ (Request for Quotation) for Aluminum Die Casting Parts or Zinc Die Casting Parts, comparing unit prices alone can be highly misleading. For the same technical drawing, quotes from different Casting Foundries may vary by 20% to 40% due to differences in alloy grades, mold ownership, secondary machining scope, inspection standards, and lead time definitions. To avoid hidden costs and delivery risks, international buyers should systematically ask the following 15 core questions when sourcing from manufacturers specializing in aluminum/zinc high-pressure die casting, Gravity Casting, and Low Pressure Casting.

Clarify whether the material is ADC12, A380, A356 (aluminum) or Zamak 3/5 (zinc), and confirm compliance with the latest revision of ASTM, EN, JIS, or ISO standards. Require suppliers to explicitly state in the quotation whether a Material Certificate / Mill Test Report is provided with the shipment.

Professional manufacturers provide process recommendations based on wall thickness, air tightness requirements, and production volume. High-pressure die casting is ideal for high-volume complex thin-walled parts, while gravity and low-pressure casting are better for structural components requiring high mechanical properties and sealing performance.

Q3: What is the approximate casting weight range and maximum projection area your factory can handle? What clamping force specifications are available for die casting machines?

Q4: Are molds designed and manufactured in-house or outsourced? Can you provide DFM (Design for Manufacturability) analysis and Flow Simulation reports?

Q5: How are mold costs amortized? Who owns the intellectual property and mold base material – the buyer or the supplier?

Q6: What is the estimated mold lead time? When will mold trials (T1/T2) and FAI/FAIR (First Article Inspection Report) be available?

Results vary significantly among these three methods. A unified benchmark is required for accurate price comparison; otherwise, a seemingly low price may result from using a lighter weight basis.

Some suppliers only quote “as-cast” unit prices, with secondary processes charged separately. For parts requiring aluminum hard anodizing or precision machining, request an itemized breakdown or an all-inclusive package price.

Q9: What is the Minimum Order Quantity (MOQ)? What tiered pricing applies to different annual purchase volumes?

Stable suppliers usually maintain a yield rate above 95% to 98%. Clarify whether defective parts are replaced free of charge and the lead time for replacement.

Automotive safety components and hydraulic housings often require X-ray inspection for internal porosity and shrinkage, evaluated per ASTM E505 or EN 12681.

Q12: What quality system certifications does the factory hold? Does the factory have IATF 16949 for automotive projects? Can products meet export environmental directives such as RoHS and REACH?

Some quotations only cover “post-production shipping time” and exclude upfront engineering milestones, which can easily lead to incorrect project scheduling.

Traceability is a basic requirement for automotive and industrial component buyers, enabling quick scope isolation in the event of quality issues.

Q15: What packaging methods are used to prevent shipping damage? Can anti-corrosion treatment and custom export wooden crates be provided per buyer specifications?

Sending the above 15 questions along with technical drawings and requiring suppliers to respond item-by-item in their quotations ensures genuine comparability between different vendors. For long-term strategic suppliers, it is also recommended to arrange third-party factory audits or virtual line tours before the first order to verify the actual implementation of claimed production capacity and quality control systems.