Oct 3, 2026
AQL Inspection Terms: How to Write Them Into Your Apparel PO
'Good quality' is not a contract term. An AQL clause makes defect levels testable — what to specify, and wording you can reuse in your next PO.
Short answer: replace "quality inspection before shipment" with an AQL clause — sampling standard, defect classes, accept numbers and a remedy path. A shipment of 3,000 polos arrives with measurements outside tolerance, print 2 cm low on a batch, a handful of crooked collars. You say reject; the supplier says normal tolerance; your PO says "quality inspection before shipment". That sentence has no number, so nobody is wrong — and you have no remedy. The fix costs nothing at order time: an AQL clause that turns "good quality" into a countable standard.
Below: what AQL measures, the defect classes in apparel terms, which levels to use, clause wording you can reuse, and what happens when a lot fails.
What does AQL actually measure?
AQL (Acceptable Quality Limit) is a sampling standard — in apparel usually ISO 2859-1 or its US equivalent ANSI/ASQ Z1.4. It works in three steps:
1. Your lot size determines a sample size — an order of a few thousand pieces is sampled at a few hundred, not inspected piece by piece.
2. Each defect found is classified critical, major or minor.
3. The standard's tables give accept and reject numbers per class. More defects than the accept number in any class → the whole lot fails.
The point is not that defects are allowed. It is that *how many is too many* is agreed in writing before production, so a failed inspection is arithmetic, not an argument.
True or false
✔ True: a failed AQL inspection is arithmetic, not an argument. Once the standard, classes and levels are in the PO, the reject report ends the discussion — the accept/reject counts decide.
✘ False: demanding 100% inspection removes the need for written terms. Full inspection multiplies cost and still needs written defect definitions to be enforceable — screening without classes just produces opinions at higher price.
What do the three defect classes mean for garments?
• Class · Meaning · Apparel examples
• Critical · Safety or legal failure · Broken needle fragment, mould, flammable finish, missing legally required labelling
• Major · Affects wear, sale or durability · Measurement outside tolerance, print off-position or wrong colour, open seam, visible fabric flaw
• Minor · Workmanship, does not affect use · Loose thread ends, slight fabric curl, small untrimmed overlock
If your PO does not define which findings count as major versus minor, classification happens after the fact — by whoever has more leverage. Write the class list into the order, with your product's examples, before the deposit. The
sampling checklist
pairs with this: the sample locks the standard; the AQL clause enforces it in bulk.Which AQL levels should you use?
The combination most apparel buyers specify: critical 0, major 2.5, minor 4.0. These are common defaults, not law. Adjust by what a defect costs you:
• Tighten major (e.g. 1.5) for client-facing programmes — uniforms your customers will see, where a visible defect costs brand image.
• Loosen minor for giveaways and event apparel, where finish-level imperfections have no commercial consequence.
• Keep critical at 0, always. A needle fragment is never a tolerance question.
Take away: set levels by cost of defect, not by what sounds strict. Every step tighter raises inspection cost and rejection risk — reserve tight levels for products where defects are expensive.
The clause, word by word
Copy, adjust the brackets, paste into your PO:
Quality inspection. Final random inspection shall be performed per ISO 2859-1 (or ANSI/ASQ Z1.4), General Inspection Level II, single sampling, when 100% of the order quantity is produced and at least [XX] is packed.
Acceptance criteria. Critical defects AQL 0; major defects AQL 2.5; minor defects AQL 4.0. Defect classifications per Appendix [A], agreed at pre-production sample approval.
If the lot fails. The supplier shall 100% inspect and rework or replace affected units at the supplier's cost, and a re-inspection shall be performed. Re-inspection costs arising from a failed first inspection are borne by the supplier. Re-inspection adds [XX] days; the delivery date extends only by re-inspection time caused by defects attributable to the supplier.
Records. The inspection report, including defect photos and sample size, shall reach the buyer within [XX] hours of each inspection.
Three details buyers most often skip, all three load-bearing:
1. "When 100% produced" — otherwise inspection runs mid-production and passes goods that do not yet exist.
2. Defect appendix at sample approval — the pre-production sign-off is where classification gets agreed, while both sides are still cooperative.
3. Report with photos — without it, a "fail" is your word against theirs.
Who performs the inspection, and who pays?
Three arrangements, in rising order of independence:
• Supplier's in-house QC — included in the price; appropriate for repeat orders on a stable programme with specs on file.
• Third-party inspection — booked per inspection day, market rate [XX], paid by the buyer; standard for a first order with a new programme.
• Your own visit — most independent, usually only economic when you are already in the region.
Take away: for a first bulk order, third-party final inspection is cheap insurance against the shipment value. Move to supplier QC plus spot third-party checks once the programme has a passing history.
When a lot fails: the remedy path
1. Lot fails → reject report with photos within the agreed reporting window.
2. Supplier reworks or replaces affected units — 100% screening, at supplier cost.
3. Re-inspection, with the PO already saying who pays and how many days it adds.
4. If re-inspection also fails → the PO's failure-to-deliver terms take over.
Without the clause, every step is a negotiation — usually while your delivery date burns. With it, the conversation is "the clause says", not "we think". And because custom goods cannot be returned, prevention is the only protection — the same logic as
written specs for non-returnable orders
.Frequently Asked Questions
What does AQL 2.5 mean in clothing?
It is the acceptance quality limit for major defects: under the ISO 2859-1 sampling plan, the maximum share of major defects considered acceptable in the sampled lot. The tables convert it into exact accept/reject counts for your order size.
Is AQL inspection mandatory for apparel orders?
No — it is a commercial term. Nothing requires it, which is exactly why you should write it in: without a standard you have no agreed basis to reject goods.
Who pays for third-party inspection?
Normally the buyer, per inspection day. On a failed first inspection, a well-written clause pushes re-inspection costs to the supplier.
What happens if a shipment fails the AQL inspection?
Per the clause above: 100% rework or replacement at supplier cost, re-inspection, and schedule protection via the re-inspection-days mechanism. Without a clause, you renegotiate all of it after the fact.
Does AQL work for small orders?
The sampling tables have minimum sample sizes, so on small lots the sample approaches the whole shipment — inspection still works, but cost per piece rises. For small orders, tighter in-line checks during production are often more practical.
What is the difference between AQL and 100% inspection?
AQL samples and gives statistical coverage at a fraction of the cost; 100% inspection screens every piece. Use AQL as the default and reserve 100% screening for rework after a failure.
Should AQL levels change for reorders?
They can loosen slightly once a programme has a consistent passing history — or tighten if a batch drifted. Changing levels is your right as a buyer; changing them after production is not — set them at order confirmation.
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— specs, defect classes and inspection terms are agreed at order confirmation, not after production. Or browse the product range
first.FACTS
