The Factory Is Not Finished: What a Partial-Lot Inspection Can and Cannot Prove
The call usually comes four days before the vessel cut-off: the factory has finished part of the order, the rest is “almost ready”, and someone suggests you inspect what exists and release the balance on the rest.
The call usually comes four days before the vessel cut-off: the factory has finished part of the order, the rest is “almost ready”, and someone suggests you inspect what exists and release the balance on the rest. The right answer starts with a distinction that most order paperwork never makes — a sample and a slice are not the same thing. For pre-shipment inspection in China to be worth anything, the units the inspector sees have to represent the units that ship.
🧮 A sample is not a slice
A sample is drawn at random from sealed cartons spread across the whole finished lot. A slice is whatever the line happened to produce first, which is usually the commissioning run: freshly set tooling, supervisors present, and a line still finding its rhythm. Both are 60 units in a photograph. Only one of them tells you what the other 4,940 will look like.
The sampling ladder makes the same point in numbers. Under AQL 2.5 at inspection level II, a lot of 501–1,200 units takes a sample of 80, a lot of 1,201–3,200 takes 125, and a lot of 3,201–10,000 takes 200 — sizes you can take from the AQL calculator in one click. If only 1,900 of 5,200 units exist, your population is 1,900, the other 3,300 units contribute no data at all, and no report can be written about them.
📋 Four options when the goods are not ready
| Option | What it buys | What it costs | When it is right |
|---|---|---|---|
| Reschedule the visit for the complete lot | One honest AQL sample of the real order | Risk of a second mobilisation if the factory slips again | The cut-off still has room and the vessel can be held |
| Inspect the finished units now, book the balance later | Early signal on tooling, material and assembly while there is time to fix them | Two visits, and two reports | You want the warning early and can afford the horizon |
| Screen the finished units only | 100% visual and function pass on what exists | Proves nothing about the tail; cannot release payment | The finished portion is shipping by itself |
| Split the shipment and the purchase order | A controlled head with its own carton plan and FNSKU | Extra freight and paperwork, plus a second booking | The tail is at genuine risk of being rushed after a holiday |
Whichever you pick, the one thing not to do is average the two halves together in a single report. A lot is one production run; if the head was built before a holiday and the tail after it, you own two lots and you should decide on them separately.
🔍 What a partial-lot visit can still prove
Quite a lot, and all of it early-warning shaped. Tooling is the big one: the first units off a new or repaired mould show wall thickness, weight and fit problems that will either be fixed now or shipped in every single unit later. Material grade, hardware bags, carton printing, FNSKU labels and the packing method on the finished pallets are all verifiable on units that exist. What a partial visit cannot prove is batch consistency across the run, unit counts against the purchase order, packaging on units that have not been packed yet, and function reliability on the tail.
So phrase the report accordingly. “1,900 units inspected, 1.4% majors, tooling and material conform” is a true statement. “Order passed” is not a true statement about an order that does not exist yet, and no inspector should sign it.
🚢 The deadline math nobody writes down
Late containers cost money too, which is why the temptation to accept a slice is real. Put the two costs side by side before deciding: a rescheduled visit is one extra man-day and a few days of schedule, while a rushed tail is discovered by customers, six weeks later, one refund at a time. Air-freighting 200 replacement units across the Pacific typically exceeds the entire inspection budget for the order, and it still arrives after the listing has collected the reviews.
💰 Why the balance payment stays locked
The tail is precisely where substitution happens: a second line, a temporary crew, a material swapped for what was in the warehouse after the holiday, a faster packing method. If the last 20% of the payment follows the first partial report, you have removed the only leverage that makes a factory fix something before loading. Put it in the purchase order: balance against a third-party report on the complete lot, with the tail inspected separately.
✅ The five-line brief for a not-ready visit
Tell the inspector the number of units finished and the number outstanding; the date the tail completes; which checks matter most on the head; that the report must state its population in units; and that no release decision is expected from this visit. That last line sounds small and it changes everything about how the report is written.
📉 The order that shipped on a slice
A buyer placed 5,200 folding wall-mounted drying racks at FOB $9.60, an order worth $49,920, with the factory promising the balance five days after the visit. The head of 1,900 units was already finished from the commissioning run; AQL 2.5 gave a sample of 125, found 1.4% majors, and the buyer released the balance against the promise. Our inspectors wrote the report population as 1,900 units for exactly this reason.
The tail came off a second line after the holiday with 0.7 mm tube against a 1.0 mm specification. It is invisible in a carton, and it shows up when a load of wet towels goes on the rail: about 8% of 2,900 units, roughly 232 racks, sagged or bent. At FOB that is about $2,200 of refunds, plus removal and disposal costs, plus a listing whose customer photos show a bent product. The follow-up visit that would have caught the tube change at unit 400 cost one man-day.
Partial inspections are not a compromise on honesty — they are a compromise on coverage, and that is a decision to make with your eyes open. Across 2,000+ lots a year, the rushed tail is never the better half. Our inspectors report typically within 24 hours with the population stated in units, visits run at $169 per man-day, and if the last third of your order is still on the line we will tell you plainly what the visit can and cannot stand behind. Send the production status and we will map the two-visit option against your cut-off; see pricing for how mobilisation is quoted.
❓ FAQs
Can an inspection certify a lot that is not finished?
No. The report can only cover the units that exist, and it should state that population in units rather than implying it covers the purchase order. Anything else is a document that will be quoted back at you in a dispute.
What if only a few hundred units are ready?
That is still useful as an early warning. A few hundred finished units is enough to check tooling dimensions, material grade, hardware and packing method, but the sample ladder shrinks with the population, so a 200-unit lot takes 32 units — fine for a first-off check, not for a release decision.
Does a partial inspection cost less?
It is the same man-day price, because the inspector still travels, samples, tests and writes a report. What changes is coverage, not effort: two visits on a split order are two man-days, quoted at $169 per man-day with the mobilisation fee stated upfront.
Should I pay the balance after a partial inspection passes?
Not against the whole order. Release only what has been inspected, or hold the balance until the tail has its own report. The final payment is the only real leverage you have over rework before loading.
How quickly can a second visit be booked?
Normally the next working day once the balance of the order is packed, subject to inspector availability in the region. Reports go out typically within 24 hours of the visit, so the second report usually lands before the container is stuffed.
Frequently asked questions
Can an inspection certify a lot that is not finished?
No. The report can only cover the units that exist, and it should state that population in units rather than implying it covers the purchase order. Anything else is a document that will be quoted back at you in a dispute.
What if only a few hundred units are ready?
That is still useful as an early warning. A few hundred finished units is enough to check tooling dimensions, material grade, hardware and packing method, but the sample ladder shrinks with the population, so a 200-unit lot takes 32 units — fine for a first-off check, not for a release decision.
Does a partial inspection cost less?
It is the same man-day price, because the inspector still travels, samples, tests and writes a report. What changes is coverage, not effort: two visits on a split order are two man-days, quoted at $169 per man-day with the mobilisation fee stated upfront.
Should I pay the balance after a partial inspection passes?
Not against the whole order. Release only what has been inspected, or hold the balance until the tail has its own report. The final payment is the only real leverage you have over rework before loading.
How quickly can a second visit be booked?
Normally the next working day once the balance of the order is packed, subject to inspector availability in the region. Reports go out typically within 24 hours of the visit, so the second report usually lands before the container is stuffed.