---
title: "AQL 2.5 Explained: Pre-Shipment Inspection Sample Sizes"
url: https://eliteglobaltrade.co/aql-2-5-pre-shipment-inspection
description: "AQL 2.5 explained: what Acceptable Quality Limit means in pre-shipment inspection, with ISO 2859-1 sample sizes, accept/reject numbers and defect levels."
lang: en
---

Resource

# What Does AQL 2.5 Mean in Pre-Shipment Inspection?

Last updated: October 2026

AQL (Acceptable Quality Limit) is the maximum number of defective units tolerated in a random sample before a batch is rejected. AQL 2.5 is the usual limit for major defects in consumer goods, and AQL 4.0 is common for minor defects. Critical defects (safety) are normally set at zero tolerance.

## Typical AQL levels by defect type

| Defect type | AQL (maximum accepted) |
| --- | --- |
| Critical (safety hazards, legal violations) | 0 — not accepted |
| Major (functional failures, significant appearance issues) | 2.5 |
| Minor (small cosmetic issues that don't affect function) | 4.0 |

A single critical defect fails the batch outright. Major and minor defects are counted separately and compared against their own accept and reject numbers.

## How the sample size works

Inspectors do not check every unit. Under ISO 2859-1 / ANSI Z1.4, the sample size is determined by the total lot size and the inspection level — most commercial pre-shipment inspections use General Inspection Level II with normal single sampling. The lot size maps to a sample size, and each sample size has an accept number and a reject number for each AQL. If defects found are at or below the accept number, the batch passes; at or above the reject number, it fails.

| Lot size | Sample size | Accept / Reject at AQL 2.5 (major defects) |
| --- | --- | --- |
| 151–280 units | 32 | Accept 2, reject 3 |
| 281–500 | 50 | Accept 3, reject 4 |
| 501–1,200 | 80 | Accept 5, reject 6 |
| 1,201–3,200 | 125 | Accept 7, reject 8 |
| 3,201–10,000 | 200 | Accept 10, reject 11 |
| 10,001–35,000 | 315 | Accept 14, reject 15 |

**Worked example:** an order of 3,000 units gives a sample of 125 units. The batch passes if the inspector finds 7 or fewer major defects in that sample, and fails at 8 or more.

## When to use a tighter or looser AQL

- **Tighter (e.g. AQL 1.0 for major defects):** children's products, medical items, food-contact goods and other safety-sensitive products, or high-value orders where defects are costly.
- **Standard (Major 2.5 / Minor 4.0):** most consumer goods — the default for B2B importers.
- **Looser (e.g. AQL 4.0 for major defects):** low-cost commodity goods where minor imperfections are commercially acceptable.

Whatever levels you choose, the AQL is agreed with the factory in the purchase contract before production starts — so both sides know the quality bar before goods are made.

## How Elite Global Trade applies AQL

We apply the agreed AQL on every DUPRO and pre-shipment inspection (https://eliteglobaltrade.co/dupro-psi-inspection-guide) we coordinate. Inspectors sample to General Inspection Level II, count defects by category, and deliver a report with photo and video evidence for every finding, so you can see exactly what was found before you authorise shipment. For new suppliers, we recommend pairing the inspection with a factory audit (https://eliteglobaltrade.co/china-factory-audit-complete-guide) so the production environment is validated before the first order.

## Frequently Asked Questions

### What is AQL?

AQL stands for Acceptable Quality Limit. It is the maximum number of defective units tolerated in a random sample drawn from a production batch before the whole batch is rejected. Inspectors check the sample, count defects by category, and compare the counts against the accept and reject numbers for the agreed AQL.

### What is the difference between AQL 1.0, 2.5 and 4.0?

The number is the defect limit: the lower the number, the fewer defects are tolerated before the batch fails. AQL 1.0 is a tight limit used for higher-risk or higher-value products. AQL 2.5 is the usual limit for major defects in consumer goods. AQL 4.0 is common for minor defects — small cosmetic issues that do not affect function or safety.

### What happens if the batch fails?

If the defect count reaches the reject number, the batch fails inspection and you should not authorise shipment. The typical next steps are a corrective action plan from the factory, sorting or rework of the affected units, and a re-inspection of the corrected batch before release.

### Who sets the AQL?

The AQL is agreed between the buyer and the factory in the purchase contract before production starts. The buyer specifies the limits for critical, major and minor defects; the inspector then applies those limits when sampling and counting defects. If nothing is specified, most inspectors default to Critical 0 / Major 2.5 / Minor 4.0.

### Is AQL 2.5 enough for my product?

For most consumer goods, AQL 2.5 for major defects with AQL 4.0 for minor defects is the industry standard and is sufficient. For children's products, medical items or other safety-sensitive goods, buyers typically tighten the limits — for example AQL 1.0 or lower for major defects — and always keep critical (safety) defects at zero tolerance.

_Sample sizes follow ISO 2859-1 / ANSI Z1.4, Level II, normal inspection._

## Work with Elite Global Trade

HK-based China sourcing agent. AQL quality control, OEM manufacturing and DDP delivery to 50+ countries. Response in 24 hours.

Request an Inspection Quote (https://eliteglobaltrade.co/contact)

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