A first-article report proves the first part. It says nothing about the five hundredth. Per-shipment inspection is the habit of measuring and documenting every batch that ships, not just the one that got the program approved. For a buyer, it is the difference between trusting a sample and trusting a supply.
First-article vs per-shipment
A first-article inspection (FAI) confirms the part can be made to spec. It is necessary and worth doing — but it is a point in time. Production drifts: tooling wears, setups vary, a different operator runs the floor. A report from batch one tells you nothing about batch twelve. Per-shipment inspection closes that gap by treating every shipment as something to verify, not assume.
| First-article (FAI) | Per-shipment inspection | |
|---|---|---|
| What it proves | The part can be made to spec | This batch matches the approved spec |
| When it happens | Once, at qualification | Every shipment |
| Catches | Design and setup errors | Drift, wear, and batch variation |
| Buyer risk | Low at batch 1, unknown after | Low and documented across the run |
What a per-shipment report should contain
A useful report is specific and tied to the part, not a generic sign-off. At minimum:
- Key dimensions measured on a CMM — the critical tolerances, with actual values, not just pass/fail.
- Material certificate — the named grade and cert that traveled with the order.
- Datums and method — so the measurement is repeatable and comparable to the first article.
- Batch and quantity — so a finding maps to a specific shipment, not “the part in general.”
- Visual or surface notes — finish, burrs, and anything that matters to fit or function.
Why it prevents rejects, not just detects them
Inspection has two jobs. The obvious one is catching a bad batch before it reaches your line. The quieter one is creating a record that, over time, shows where variation lives — so the cause is fixed upstream instead of re-checked forever. A per-shipment CMM record turns inspection from a gate into a feedback loop.
Our CNC and 5-axis work is measurement-first: a CMM report travels with every shipment, not just the first article.
The accountability angle
A report per shipment is also how a supply partner stays accountable. When every batch is documented, “the part was fine when it left here” becomes “here is the measured proof for this exact batch.” For tight-tolerance work — grinding to ±0.002 mm, 5-axis to ±0.005 mm — that proof is what lets you receive with confidence instead of re-measuring everything yourself.
For parts that go on to assembly, documented inspection is what makes delivered, inspected units trustworthy. See our assembly and sub-assembly work.
What to ask for, and what to watch
- Is a CMM inspection report included with every shipment, or only the first article?
- Are the reported dimensions the critical ones, measured against the locked datums?
- Does the report include the material certificate and batch identity?
- If a batch is out of spec, what is the remediation — and is it documented?
Bottom line
A first-article report gets a program started. A per-shipment report keeps it honest. If a partner offers inspection only at qualification, you are being asked to trust that nothing drifts — and everything drifts. Ask for the report with every batch; it is a small cost that prevents the large one.
Frequently asked questions
Q: Isn’t first-article inspection enough?
A: For qualifying the design, yes. But it proves only the part made at qualification. Production drifts as tooling wears and setups vary, so a first-article report says nothing about later batches. Per-shipment inspection verifies each batch against the approved spec.
Q: What makes an inspection report trustworthy?
A: Specifics tied to the part: actual CMM values on critical dimensions, measured against the locked datums from validation, plus the material certificate and batch identity. A generic pass/fail sign-off is far less useful than measured values you can compare to the first article.
Q: Does per-shipment inspection slow delivery?
A: It adds a small, planned step. For most custom-part programs the cost is minor relative to the cost of receiving a bad batch and stopping a line. Done as part of the normal shipment workflow, it does not change lead time meaningfully.
Want every batch measured and documented? Request a quote and we will include a CMM report with every shipment. See the full range on our capabilities page.
Related reading: CNC Machining Tolerances 101 · How to Vet a Manufacturing Partner · Prototype to Production