During Production vs Pre-Shipment Inspection

Last fact-checked: November 10, 2026.

A pre-shipment inspection looks at finished goods. A during-production inspection looks while the line can still change. Loading supervision, later, looks at how those goods go into the container. NIST's glossary, dated June 12, 2023 in the lexicon entry, calls quality control that part of quality management focused on fulfilling quality requirements. NIST's handbook says the main purpose of acceptance sampling is to decide whether the lot is likely to be acceptable, not to estimate the quality of the lot. This page is only about when you book the visit. The definitions stay on the quality control page, and the sample plan stays on the AQL page. No inspection fee is stated, and no firm is recommended.

Folding chairs, already in cartons

A buyer orders folding chairs. The weld at the hinge is the part that fails in use. The only visit booked is a pre-shipment inspection, and by then the cartons are closed. The inspector can open a sample, find hinges that rock, and write a fail. Rework means opening cartons that were already packed. A during-production visit, while the hinges were still on the bench, would have seen the same rock before the tape went on. There is no price and no factory name in this example. The point is the clock, not a vendor.

Article 779 of the Civil Code's English text, checked November 10, 2026 on the State Council attachment, says a contractor accepts the client's necessary supervision and inspection during the work, and that the client may not disturb normal work by doing so. Agree the window. Do not treat the article as a right to walk any line on any morning.

During production, pre-shipment, and loading

Book the early visit when a fail would mean opening finished goods, not when you simply want more photos. On the chairs, that moment is the hinge weld, before the frames are stacked. On a printed carton or a sewn seam, it is the same idea: look while the line can still stop. You can still book the packed-goods visit afterward. The two visits do not cancel each other. One asks whether the process is building the right thing. The other asks whether the lot you are about to pay for meets the file. The pre-shipment inspection checklist is the staged list. A factory visit that asks whether the process can repeat is a supplier audit, not a lot decision. The BSI catalogue, checked November 10, 2026, lists BS ISO 2859-1:2026, published 31 January 2026. If you name that standard, also name the sample size, the acceptance number, and the rejection number. This page does not invent those numbers. The lot fails when the count reaches the rejection number you wrote, which is the decision NIST describes, not a score out of ten.

What the report should show

• The requirement it was testing, copied from the quality agreement, not from the inspector's taste.
• Photos of the failing point and of a unit that meets it.
• The measurement you specified and the measurement found.
• How many units were drawn, how many failed, and the accept and reject numbers.
• A decision: ship, sort and look again, or hold. "Average" is not a decision.
• The edition of the sampling standard, if you named one.

Send the inspector the signed sample, the defect classes, and the decision you will take, in one pack. A visit without that pack produces a diary. A visit with it produces a number you can hold the balance against, if the contract says the balance waits on the report. A visit does not become a laboratory. Chemical and safety tests are the product testing page. A hinge that passes a rock test is not a pass on a coating or a children's-product rule.

Pitfalls

• Booking only the final visit when the defect is built in early and expensive to reopen.
• Using a during-production look as if it had accepted the packed lot. NIST's point is a lot decision from a sample, not a walk-by.
• Paying the balance on a report that never states a sample size or a decision.
• Letting the inspector invent the spec because the quality file was never sent.
• Treating one company's method page as the standard. The standard, if you use it, is the one you name, such as BS ISO 2859-1:2026.

Say which visit you want, and attach the spec, on the RFQ. Booking the visit as a job is quality-control inspection.

Frequently asked questions

Is during-production the same as DUPRO?

Buyers use DUPRO as the short name for a during-production inspection. It is not a term defined on the NIST or BSI pages checked for this article. Describe the moment: unfinished goods, while rework is still open.

When is pre-shipment enough?

When the failure you care about can still be seen, counted, and refused on packed goods, and rework would not mean rebuilding the lot. If the defect is hidden inside a finished assembly, look earlier. This is a planning judgment, not a rule from an official page.

Does the inspector replace a lab?

No. Sampling decides a lot against a written requirement. A safety or chemical question needs the test the destination rule names. That handoff is the testing article.

The check that follows this one is Third-Party Inspection in China, claims after defective goods arrive, a factory audit before the first order, and tracking production.

Official sources

• NIST glossary, quality control. Lexicon date June 12, 2023. Checked November 10, 2026.
• NIST handbook, acceptance sampling. Checked November 10, 2026.
• BSI, BS ISO 2859-1:2026, catalogue date 31 January 2026. Checked November 10, 2026. No AQL number is copied here.

The Civil Code sentences are from the State Council English attachment cited above. This page does not choose an inspection company.