Manufacturing Documentation and Traceability
For supplier quality engineers and buyers who need to know which records will arrive with machined parts and what each one proves.
Use this page to choose documents by the decision they support, check how each is tied to part number, revision, quantity and batch, and write the requirement into the purchase order.
Choose Documents by the Decision They Support
Each manufacturing document answers one question at receipt.
Each receiving decision relies on a different document — concept illustration
A dimensional report tells you what was measured, on which pieces. A material certificate tells you what the stock was. A certificate of conformity records the supplier's statement that the shipment meets the order. Start from the decision your team makes when the parts arrive, such as releasing them to assembly, accepting the batch into stock or filing evidence for your own customer, and ask for the documents that decision relies on.
Additional documents can change the quote, because each one needs its own work: measuring and recording more characteristics, obtaining certificates from a material or finishing source, or preparing a report in your template. Asking for the set your process actually uses keeps quotes from different suppliers comparable.
Related: Quality and inspection
results for the features that locate, mate or seal.
quantity, revision and batch matching the PO and the labels.
the records your own customer or auditor will ask for.
Six Common Documents: What They Show and What They Cannot
The table separates what each document can show from what it cannot show on its own. A document is evidence for the scope written on it and for the parts it identifies; anything outside that scope needs another record or another check. Which of these documents can be supplied for a given order is stated as [available for your order: to be confirmed], and the set is agreed at quotation.
| Document | What it can show | What it cannot show by itself |
|---|---|---|
| Dimensional inspection report | Results for the listed characteristics, with method and the pieces measured | That unlisted features conform, or that every piece was measured, unless stated |
| First-article record | That the first part from the released process was checked against the full drawing revision, as agreed | That later batches or a changed revision stay the same |
| Material certificate | Grade, condition and test results for a heat or lot of material, as stated by its issuer | Which finished parts were cut from that lot, unless the supplier records the link |
| Finishing or treatment certificate | The process, specification and lot treated, as stated by the processor | Dimensions after finishing, or coverage on areas it does not list |
| Certificate of conformity | A signed statement that the shipment meets the stated order requirements | Measured values; it relies on the records behind it |
| Packing list | Part numbers, revisions, quantities and packages in the shipment | Whether the parts conform |
Read the scope line
each document should state what it covers. If the scope is missing, ask for it before the document is used for acceptance.
Inspection Reports and First-Article Records
A dimensional inspection report lists the characteristics measured, the requirement, the result and the method.
A redacted report header showing part number, revision, order reference and quantity inspected
A redacted ballooned drawing whose feature numbers match the lines of the inspection report
Its header ties it to the part: part number, drawing revision, order reference, the quantity inspected and the lot size it was drawn from and, if pieces are identified individually, which ones were measured. Feature numbers that match a ballooned copy of your drawing let you trace each result back to a feature.
A first-article record checks the first part or parts from the released process against the full drawing revision, as agreed for the order. It shows that the process made the part to that revision at that time. It does not cover later batches or a changed revision; a revision change normally calls for a new record of the affected features. Availability of these records: [available for your order: to be confirmed].
Related: Quality and inspection
Name the format
if your quality system requires a specific first-article form, name it in the inquiry, so its scope can be confirmed for your order.
Material and Finishing Certificates
A material certificate is issued by the mill or stockholder for a heat or lot of material.
A redacted material certificate with the heat or lot reference that links it to a batch
A redacted finishing certificate naming the specification and the lot of parts treated
It states grade, condition and test results for that lot, as declared by the issuer. On its own it does not say which finished parts were cut from that lot. That link exists only if the supplier records the lot used for each batch and shows it on the report, label or packing list, so ask for it if your acceptance relies on material identity.
A finishing or treatment certificate is issued by whoever carried out the process, in the factory or at an outside processor. It refers to the process specification, the lot treated and any test the processor ran, such as a coating thickness check. It does not report part dimensions after finishing unless they were measured separately. Availability of these certificates: [available for your order: to be confirmed].
Related: Materials and surface finishing · Clarifying material grade, condition and documentation
Certificate of Conformity and Packing List
A certificate of conformity is a signed statement that the shipped parts meet the requirements of the stated order.
A package label and the packing list for the same shipment, with matching part and batch fields
It should name the PO, part number, revision and quantity, the person who signed it and the records it relies on. It carries no measured values; its weight comes from the reports and certificates behind it, so check that those are listed and available. Availability: [available for your order: to be confirmed].
A packing list states what is in each package: part number, revision, quantity, batch reference and package number. It is usually the first document your receiving team checks, against the labels and the PO. It says nothing about conformance, but a mismatch on it, such as a wrong revision or quantity, is the error that can be caught before any box is unpacked.
Related: Packaging and delivery · Packaging and identification requirements for machined parts
Match three places
the part number and revision on the label, the packing list and the report should read the same. A difference is a question to raise before the parts are used.
Four References That Tie Every Document to the Parts
Every document in the set should carry the same four references. The part number identifies the design; if the supplier also uses an internal number, your number should appear beside it. The revision states which drawing definition the parts were made and checked to. The quantity states how many pieces the document covers, which for an inspection report may be fewer than the quantity shipped. The batch or lot reference groups parts made together and links them to the material lot and any finishing lot.
When one of the four is missing, the document may still be correct, but you cannot show that it belongs to your parts. Ask for all four on every document, and for the batch reference to appear on the package label as well, so a part separated from its box can still be traced.
Batch is not serial
a batch reference groups parts made together. If each piece must be identified, state serialisation and the marking method on the PO.
Following One Batch Through Its Records
A practical test of a supplier's traceability is to pick one shipped batch and follow it backward. Start at the package label and packing list, move to the inspection report that names the same batch and revision, then to the finishing and material records that name the lots used for it. If each step names the one before it, the chain holds. Where a step names only the order, the link is weaker than it looks.
Ask how batch identification is kept with the parts during machining and finishing: [How batch identification is recorded at mgz, to be confirmed]. Parts that leave for an outside process and come back are a hand-off to ask about specifically, because their identification has to survive the trip in both directions.
Related: Case template: identification, packing and delivery records
Bar or plate stock carrying the heat or lot tag that its certificate refers to
Parts in process kept with a card that carries part number, revision and batch
Packed parts with the label and packing list that close the record chain for the batch
Write Document Requirements into the PO
Documents that are not on the PO are open to interpretation at shipment. Name each document, what it must cover and when it is due. For an inspection report, say whether it covers all drawing characteristics, a listed set or your ballooned features, and on how many pieces. For material, name the certificate type your quality system requires, for example an EN 10204 type 3.1 certificate for metallic material, and whether it must be linked to the batch.
Document and scope: name, characteristics or tests covered, number of pieces.
References: part number, revision, quantity and batch on every document.
Form: supplier format or your template, language and units.
Timing: electronic copy before dispatch, paper copy with the parts, or both.
Approval: whether documents need your release before shipment.
Add the form and delivery: the supplier's format or your template, language and units, an electronic copy before dispatch or a paper copy in the box, and whether documents must be approved before the parts ship. Put the same list in the inquiry, so the quote already covers it.
Review a Redacted Sample Before You Order
Before ordering, ask for a redacted sample of each document type you intend to require. Check that it carries the four references, that the scope line is clear, that the issuer and signature are identified, and which fields were removed for confidentiality. Then compare it with your receiving checklist and note any field you need that the sample does not show. Redacted samples available on request: [to be confirmed].
Ask how long records are kept after shipment and how a copy can be requested later, for example during a customer audit or a field return: [Record retention period, to be confirmed]. A sample shows the format, not the result for your parts; the documents for your order are issued against your own drawing revision and PO.
Sample, not evidence
a redacted sample shows what a document will contain. It does not show that your parts conform.
Documentation and Traceability Questions
These answers cover questions supplier quality engineers and buyers raise when they set the document requirements for a machined part. Where an answer depends on which documents the company can issue, the placeholder marks what is still to be confirmed for your order, so you can ask for it at quotation.
Is a certificate of conformity enough for receiving inspection?
It depends on your receiving process. A CoC records the supplier's statement that the parts meet the order, but it carries no measured values. If your acceptance relies on specific features, material identity or a finish, ask for the reports or certificates that cover them and check that the CoC lists them. Which documents can be supplied: [available for your order: to be confirmed].
Can the material certificate be tied to the parts in my shipment?
Only if the lot used for your batch is recorded during manufacture and shown on a document that travels with the parts, such as the inspection report, the label or the packing list. A certificate supplied without that link identifies the material lot, not your parts. State the link as a PO requirement if material identity is part of your acceptance.
Can documents be sent before the parts ship?
Electronic copies before dispatch let your team review them while the parts are in transit, or approve shipment if your process requires it. State this on the PO, with the address the documents should go to and whether shipment waits for your approval. Paper copies in the box are still useful at receiving, so you can ask for both.
What happens to documents if the drawing revision changes during an order?
Documents follow the revision the parts were made to. If a revision changes part-way through, parts at the earlier and the new revision need separate records and separate labels, and the first-article record may need repeating for the changed features. Agree how mixed revisions are handled, and which quantity each revision covers, before the change takes effect.
How long are manufacturing records kept after shipment?
[Record retention period, to be confirmed]. If your own customer or a regulation requires records to be available for a set period, state that period on the PO, along with how a copy should be requested later. Keep your own copy of every document received, since it is the version your receiving inspection relied on.
Can documents carry our part number and use our report template?
Your part number should appear on every document, beside any internal number the supplier uses. A report in your own template is a reasonable request for a recurring part; send the template with the inquiry so the format and its fields can be confirmed and included in the quote: [available for your order: to be confirmed].
Discuss Documents for Your Order
List the part number, revision and quantity, and the documents your receiving inspection needs with each shipment or batch.
Sales contact (pending)
Name, role and photo to be confirmed
Drawings are optional for an initial discussion.
Start with the information you have; file exchange can be arranged afterward.
Name to be confirmed
Sales, company name to be confirmed
- Include your report template or PO document clause if you have one, so the document scope can be confirmed with the quote.
Project Inquiry
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