Acceptable Quality Level (AQL) is the statistical sampling standard used in virtually all China QC inspections. It answers two questions: how many units should you inspect, and how many defects are you willing to accept? Getting AQL right means you catch quality failures before shipment without inspecting every single unit. Getting it wrong means you either over-inspect (wasted cost) or under-inspect (defective goods reach your customer). AQL uses ISO 2859-1 sampling tables.
Why It Matters
For a batch of 3,200 units inspected at AQL 2.5 (General Inspection Level II), the sampling plan requires inspecting 200 units. The acceptance number is 10 and the rejection number is 11. This means: if 10 or fewer units show critical or major defects, the batch passes. If 11 or more show defects, the batch fails.
What You Need to Know
The AQL number (2.5 in this case) represents the maximum percentage of defective units considered acceptable — at AQL 2.5, you accept that up to 2.5% of the batch may have defects. The three defect categories and typical AQL settings: Critical defects — AQL 0, meaning zero tolerance. One critical defect in the sample and the entire batch is rejected. Major defects — AQL 2.5 is standard.
What You Should Do
Minor defects — AQL 4.0 is standard. Importers of premium consumer goods often tighten this to AQL 1.5 for major defects and 2.5 for minor defects. The practical advice: don’t blindly use AQL 2.5/4.0 for everything. Set defect definitions specific to your product.
One Data Point
“Scratch on surface” is a minor defect for a refrigerator back panel but a major defect for a smartphone screen. Before the inspection, send the QC company a detailed inspection checklist with product specifications, defect definitions with photos of acceptable vs. unacceptable examples, required tests (function, dimension, packaging drop test, barcode scan), and AQL levels per defect category. The more specific your checklist, the more useful the inspection report.
According to QIMA 2025 Quality Report, third-party QC inspections in China detected an average defect rate of 2.8% across all product categories, with electronics at 2.1%, textiles at 3.4%, and toys at 4.2%. Inspections using AQL 2.5 sampling standards catch approximately 95% of batches with defect rates above the acceptable threshold.
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