AQL Table

We use the well-proven and widely adopted international standard ANSI/ASQC Z1.4-2003 (equivalent to MIL-STD-105e, ISO2859, NF06-022, BS6001, DIN40080, and GB2828) to measure the acceptable quality level of the products we inspect.


How do I determine the right sample size and acceptance number?


For example, the order quantity is 12,000 and we select general inspection levels-II (see Table A) to be as the sampling method, then we can get sample size code letter L (see Table A). With this code letter, and if we take the single sampling plan for normal inspection, we can get the sample size: 200 from table B. It means that 200 samples can well represent this order. For an AQL of 0.15, the corresponding acceptance number is 1 and the rejection is 2.




As default, we use general inspection level II, Single sampling plan, and the AQL of:

  • Critical Defects: 0
  • Major Defect: AQL 2.5
  • Minor Defect: AQL 4.0

For example, if there's an order with 6,000 products, then according to CIS's default sampling technique, the sample size will be: 200 products. The maximum acceptable defect number will be:

  • Critical Defects: 0 Defective Products
  • Major Defect: 10 Defective Products
  • Minor Defect: 14 Defective Products