What is AQL?
AQL (Acceptable Quality Level) is the maximum percentage of defects you'll accept in a product shipment. It's the international standard (ANSI/ASQ Z1.4) for quality control in manufacturing.
Example: If you specify AQL 2.5, you're saying "I accept up to 2.5% defective units in the shipment." So a shipment of 1,000 units can have up to 25 defects.
Common AQL Levels
AQL 0.65
Strictest standard. 0.65% defects max. Used for critical/safety items (medical devices, automotive). Most expensive.
AQL 1.5
Strict standard. 1.5% defects max. Electronics, pharmaceuticals. Higher cost, longer inspection.
AQL 2.5 ⭐ Most Common
Standard quality. 2.5% defects max. Most product categories (apparel, general goods). Balanced cost/quality.
AQL 4.0
Lenient standard. 4% defects max. Low-cost items, commodities. Fastest/cheapest inspection.
How AQL Sampling Works
You don't inspect every unit (that's too expensive). Instead, you randomly sample a percentage of the shipment and check those units. Based on sample results, you accept or reject the entire batch.
3-Step AQL Process
Determine Sample Size
Based on AQL level and shipment size, calculate how many units to inspect
Randomly Sample Units
Randomly select units from shipment. Test for defects (functionality, appearance, specs)
Accept or Reject
If defects in sample ≤ acceptance number = ACCEPT batch. If > = REJECT batch
Sample Size Examples (AQL 2.5)
| Shipment Size | Sample Size | Accept If... | Reject If... |
|---|---|---|---|
| 150-280 units | 20 units | ≤1 defect | ≥2 defects |
| 281-500 units | 32 units | ≤2 defects | ≥3 defects |
| 501-1,200 units | 50 units | ≤3 defects | ≥4 defects |
| 1,201-3,200 units | 80 units | ≤5 defects | ≥6 defects |
| 3,201-10,000 units | 125 units | ≤8 defects | ≥9 defects |
Which AQL Should You Specify?
Use AQL 0.65 - 1.5 For:
- Medical/safety devices
- Automotive parts
- Electronics (high-value)
- Pharmaceutical items
- Premium/luxury brands
Use AQL 2.5 For:
- E-commerce products
- Apparel & textiles
- Home goods
- Consumer electronics
- Private label items
Use AQL 4.0 For:
- Commodity items
- Low-cost bulk products
- Packaging materials
- Industrial supplies
- Cost-sensitive markets
Best Practice:
Start with AQL 2.5 for most products. It balances quality expectations with reasonable inspection costs. Increase to 1.5 for premium positioning or safety concerns.
Let LIFA Manage Your Quality Standards
LIFA specifies AQL levels, coordinates third-party inspections, and ensures your products meet quality standards before shipment.
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