escape

An escape is a product that fails to meet specification but leaves the factory floor anyway, reaching a customer or downstream process. Unlike scrap, which is destroyed or downgraded in-house, an escape makes it into the field where it may cause warranty claims, rework, or safety problems. In high-volume manufacturing, even a escape rate of 0.1% can mean thousands of bad units annually.

Escapes happen when inspection misses a defect, when the defect occurs after final QC, or when a marginal part passes acceptance criteria that should have been tighter. Common causes include instrument calibration drift, inadequate sampling plans, worn tooling that degrades product gradually, or human error at the inspection station. In pharmaceutical and automotive supply, escapes trigger formal investigations, root cause analysis, and corrective action documentation that can take weeks to close.

Detection and Prevention

Once an escape reaches a customer and is reported back, the manufacturer must trace its lot or serial number to identify how many more are in the field. Depending on risk, this triggers recalls, field bulletins, or expanded incoming inspection at the customer site. Prevention relies on multiple defenses: 100% inspection on critical characteristics, statistical process control to catch tool wear early, and periodic audits of the inspection process itself. Some plants use a second inspector or machine vision as a backup check for high-consequence products.

The cost of an escape extends far beyond the replacement part. It includes logistics to retrieve or replace the product, investigation labor, potential liability, and damage to customer trust. A single escape to an automotive OEM can result in weeks of containment activity and tens of thousands of dollars in recovered parts and administrative work. This is why the term carries weight in manufacturing: an escape is not a minor deviation, it is evidence that the quality system failed at a specific point.