A factory audit gives you a clear picture of a supplier’s production capabilities and product quality. It focuses on the machinery, equipment, and processes used to manufacture your goods — helping you choose a reliable manufacturer before placing an order.
Company Profile & Production Overview
Start by reviewing the factory’s general information: how long it has been in operation, the main product lines it manufactures, and its annual production capacity. Request an organization chart that shows the production and quality control departments. This helps you understand whether the supplier has the right structure and experience for your product category.
Machinery & Equipment Inspection
Check that the factory owns and operates the core machinery required to produce your product. For example, if your order requires CNC machining, injection moulding, or powder coating, those machines should be on site. Ask for a complete equipment list and verify that all critical machines are maintained and calibrated regularly. Inspect calibration records and maintenance logs to confirm that machines are in good working condition and capable of meeting your specifications. Poorly maintained or outdated equipment is a common root cause of defects.
Process & Production Capability
Verify that the factory can perform all the manufacturing steps your product requires in-house. Confirm the production flow from raw material intake to finished goods. Review the standard operating procedures (SOPs) for key production stages. Check whether the factory uses jigs, fixtures, and assembly aids to ensure repeatability. Assess the production line layout for efficiency and flow, and ask about daily or monthly output capacity to make sure it matches your order volume and lead time.
Quality Control System
Evaluate the factory’s quality management approach. Look for a dedicated QC team, a quality manual, and documented inspection procedures. Confirm that incoming raw materials and components are checked before use — ask to see incoming quality control (IQC) records. Review in-process quality control (IPQC) checkpoints on the production line. Ask how the factory handles non-conforming products: there should be a clear area for defective items separated from good stock, along with a corrective action process. Check whether the factory uses any statistical process control (SPC) tools or automated inspection systems.
Pre-Production Inspection (PPI)
Before mass production begins, inspect the raw materials, components, and samples prepared by the factory. Confirm that materials match your approved specifications in terms of dimensions, material grade, and appearance. Review the first article or golden sample against your requirements. Identify any tooling or mould issues early so they can be corrected before full production runs.
During-Production Inspection (DPI)
At around 20–30% of production completion, visit the factory to inspect work-in-progress units. Check dimensions, appearance, and function against your specifications and approved samples. Review production records and confirm that the factory is following the agreed-upon process. Identify any recurring defects early so corrective actions can be applied before the bulk of the order is completed.
Pre-Shipment Inspection (PSI)
When production is 100% complete and goods are packed, carry out a final pre-shipment inspection. Select random samples from the finished goods according to an AQL (Acceptable Quality Level) sampling plan. Check product dimensions, workmanship, function, labelling, and packaging. Verify carton quantities and weight. Only release the shipment if the defect rate is within your accepted limits.
Conclusion
A thorough factory audit covering machinery condition, production processes, and quality control systems gives you confidence in your supplier’s ability to deliver consistent, high-quality products. Use this checklist during supplier selection, at the start of a new project, or whenever you increase order volumes or add new product types.