Sourcing 5-Axis CNC Machining from China: A Supplier Checklist for Overseas Buyers

A checklist for sourcing 5-axis CNC machining from China: how to write the enquiry, how to audit real capability, what to ask for in samples and first articles, and how to structure commercial and delivery terms.

Write a proper enquiry

Send the drawing or model, material specification, quantity, tolerance, finish, packaging and delivery requirement as a single package.

A complete enquiry gets an accurate quotation in days, while a vague one gets an optimistic number that changes later.

Audit capability, not certificates

Ask which machines the work will run on, what the inspection equipment is, and for a measurement report on a similar part.

For 5-axis CNC machining, the practical question is whether the supplier can demonstrate contours held to plus or minus 0.02 mm without re-fixturing on a part like yours.

Samples and first article

Approve a first article with a full dimensional report, material certificate and photographs before releasing a production batch.

Keep the approved sample and report as the reference for every future reorder.

Commercial terms

Agree Incoterms, payment structure, tooling or fixture ownership, and what happens if the drawing changes after tooling has been cut.

Agree the over and under delivery allowance as well, because production quantities rarely land exactly on the order figure.

Logistics, packaging and aftercare

Specify packing that survives sea freight, corrosion protection for bare metal, and labelling that matches your goods-in process.

Ask how non-conformances are handled before you need the answer, because that response tells you more about a supplier than any brochure.

Summary

Used during planning and again before a batch ships, the points above prevent the most common and most expensive failures.