Die Cast Aluminum Parts Sourcing Guide for Aerospace Suppliers: the 2026 production season Guide No.1886

Industrial buyers in Switzerland are consolidating their die cast aluminum parts supply base, which raises the bar on documentation, traceability and delivery discipline. It is written for Aerospace Suppliers and covers specification, supplier checks, pricing and the documentation that protects the order.

Material and Machining Basics

Ask for the mill certificate rather than a description of the alloy, because the certificate is the only document that travels with the parts. The ADC12 or A380 aluminum alloy sets the achievable tolerance, the surface finish and the tool life, so it is the first item to write into the specification. A good die cast aluminum part starts with the ADC12 or A380 aluminum alloy, so agree the grade, the temper and the certificate before you discuss price. The capability buyers pay for is porosity control and dimensional stability, and it comes from the ADC12 or A380 aluminum alloy combined with a controlled process.

Finishing, Packaging and Delivery

Label every carton with the part number, revision, lot and quantity so that receiving is quick and accurate. Plan the sailing, not the shipping date: the production calendar should work backwards from the arrival window. Insist on moisture protection and, where required, vacuum packing, because damp cartons are a common cause of claims. Rust prevention is the detail that decides whether a shipment arrives usable, especially for ferrous parts on a humid route.

Supplier Selection and Vetting

Request the process plan and the inspection plan before you pay the deposit, so you can see how the part will be made and measured. A supplier that can show recent die cast aluminum parts inspection reports is a safer partner than one that only shows photographs of finished parts. Visit or video-audit the floor; ten minutes of watching how a shop handles first articles tells you more than a page of certificates.

Quality System and Inspection Points

Agree the sampling plan and the inspection level in writing, so acceptance is a calculation rather than an opinion. For critical programmes, put a dimensional report in the carton so that receiving can verify the lot without opening the packing. Book a first article inspection before the run is released, and require the report to list every dimension against the drawing. Agree in writing what happens when a lot fails, including who pays for sorting, rework and the return freight.

Where the Price Actually Comes From

Ask what the price would be at double the quantity; the answer shows you how much of the quotation is fixed cost. Freight, duty and inland handling can add more than the unit price difference, so compare landed cost rather than ex-works price. Most quotation gaps come from a different material grade, a different finishing route or a different inspection level, not from shop margin. Setup cost is spread across the batch, so a small batch carries a disproportionate share of programming and tooling time.

How the Part Is Actually Made

Confirm the drawing revision in writing, and make sure the shop is programming from the same revision you approved. Where a feature is difficult to machine, ask for a design-for-manufacture comment before the order rather than a deviation after it. For die cast aluminum parts, the critical characteristic is X-ray porosity and dimensional report, and it should be measured on the production run rather than on a hand-finished sample. Confirm the datum scheme before production, because inconsistent datums produce parts that look right and still will not assemble.

What to Confirm Before Releasing the Order

Revision frozen, first article approved, inspection plan agreed, packing confirmed, documents ready. Tick these five boxes and your die cast aluminum parts order will most likely arrive as planned.