AQL Inspection: Turning "Check Some of It" into a Defensible Decision
Every importer who buys from China faces the same question at pre-shipment: how much of the order do you check, and what result justifies releasing it? An AQL inspection answers that question with a documented, statistically grounded accept or reject decision rather than a subjective impression from a walk-through on the factory floor. For your order, we set the AQL level, the sampling standard and the checkpoints in writing when the order is placed, before production begins, so the acceptance criteria are agreed while there is still time to influence the goods.
What AQL Means
AQL stands for Acceptable Quality Limit. Under ANSI/ASQ Z1.4 and its international equivalent ISO 2859-1, it is the quality level that defines the boundary between acceptable and rejectable lots for a given sample size. The standard assumes you sample rather than check 100% of the goods: a defined number of units is drawn at random, inspected against your defect classifications, and compared with accept (Ac) and reject (Re) numbers from the sampling table. If defects found fall at or below Ac, the lot is accepted; at or above Re, it is rejected. The result depends on the lot size, the inspection level and the AQL value you select, all of which are fixed in the order terms.
The Levels Applied by Default
Our standard control rhythm applies AQL Major 2.5 / Minor 4.0 at General Inspection Level II. A major defect is one that materially affects function, safety-related performance or saleability, such as a failed zip, a leaking seam or a misaligned critical dimension. A minor defect is a slight deviation that does not compromise use, such as a light surface mark or loose thread. Critical defects sit outside the AQL system entirely: a single safety hazard or regulatory violation stops the shipment, with the batch quarantined and a root-cause review opened. For higher-risk categories, stricter levels such as 0.65 or 1.0 are available on request.
A Worked Example (General Inspection Level II, Normal Sampling)
| Lot size | Sample code | Sample size | AQL 2.5 Ac/Re | AQL 4.0 Ac/Re |
|---|---|---|---|---|
| 151-280 | G | 32 | 2 / 3 | 3 / 4 |
| 281-500 | H | 50 | 3 / 4 | 5 / 6 |
| 501-1,200 | J | 80 | 5 / 6 | 7 / 8 |
| 1,201-3,200 | K | 125 | 7 / 8 | 10 / 11 |
| 3,201-10,000 | L | 200 | 10 / 11 | 14 / 15 |
Take a lot of 1,000 units. The table assigns sample code J: 80 units are drawn at random and inspected. At AQL 2.5, the lot is accepted if 5 or fewer major defects are found and rejected at 6. At AQL 4.0, the corresponding thresholds are 7 and 8. Both classifications run in the same inspection, so a single visit produces one report covering majors and minors against the levels you agreed.
Choosing Your AQL
The AQL level should reflect what a defect would cost you downstream, not a default carried over from a previous order. Toys and children's products, and food-contact kitchenware, justify stricter levels such as 0.65 or 1.0, with add-on checks for small parts and EN71, or food-contact migration. Textiles and apparel may call for colourfastness, pH, formaldehyde and azo dye checks alongside the visual AQL sample. Hardware and tools benefit from hardness, coating thickness and torque testing within the same visit. General household goods, stationery, bags and seasonal crafts typically run at the standard 2.5 / 4.0. Whatever level you choose, it is written into the order terms and confirmed before production, so the factory knows the acceptance criteria in advance.
What AQL Cannot Do
Sampling carries inherent risk: a lot within the limit can still contain defective units, and a small sample cannot prove a process is stable. That is why AQL inspection works as part of a chain rather than a single event. Our standard rhythm includes pre-production sample confirmation, at least two in-production checks and a final pre-shipment inspection, with the final report sent to you for confirmation at least 3 days before shipment. Critical defects are managed by process control, not by sampling: incoming material checks, in-process monitoring and first-piece approval are what keep safety and regulatory failures out of the lot in the first place. Where you designate a third-party agency such as SGS, Bureau Veritas, TÜV or Intertek, or an accredited ISO 17025 laboratory, we coordinate the booking and documentation; reports are issued by that agency or laboratory under its own report number. Certificates available upon request. To agree AQL levels for your next order, contact [email protected].