China Factory Audit Checklist: An Engineering-Focused Framework

Overview

A factory audit is a structured assessment of a manufacturing partner's capability, quality systems, and operational practices. This checklist provides an engineering-focused framework for auditing factories in China. It is designed to be adapted to your specific product type and process requirements.

Required equipment and systems depend on the factory type and the product/process being evaluated. A factory does not need every type of equipment—it needs the equipment and systems relevant to your product.

Types of Factory Audits

Common audit types include:

• Capability audit: Assesses whether the factory can make your product to specification
• Quality system audit: Evaluates the factory's quality management processes (e.g., ISO 9001 alignment)
• Process audit: Focuses on specific production processes relevant to your product
• Compliance audit: Reviews environmental, labor, and regulatory compliance

For a new supplier, a combined capability and quality system audit is typically the starting point.

Audit Preparation

Before the audit:

• Define audit scope and objectives based on your product requirements
• Prepare a product-specific checklist that extends this general framework
• Schedule the audit with the factory and confirm access to all relevant areas
• Request documentation in advance (organization chart, quality manual, equipment list)
• Plan to spend a full day on-site for a thorough assessment
• If you cannot visit in person, consider a third-party audit service—specify your requirements clearly

Production Capability

Assess whether the factory can meet your production requirements:

• Capacity: What is the current capacity utilization? Can they accommodate your volume?
• Process capability: Do they have all required manufacturing processes in-house? Which are outsourced?
• Lead time: What is the typical lead time for products similar to yours?
• Peak season handling: How do they manage capacity during peak periods?
• Changeover: How do they handle product changeovers and line clearance?

Quality Management Systems

Evaluate the three main quality control stages:

• IQC (Incoming Quality Control): How are incoming materials inspected? What are the acceptance criteria? Are non-conforming materials segregated?
• IPQC (In-Process Quality Control): What in-process inspections are performed? At what frequency? Are inspection results recorded?
• OQC (Outgoing Quality Control): What final inspections are performed before shipment? What is the AQL (Acceptable Quality Limit) level?

Also assess:

• Non-conformance management: How are defects tracked, analyzed, and corrected?
• Corrective and preventive action (CAPA) process
• Statistical process control (SPC) usage
• Calibration system for measurement equipment

Equipment and Tooling

Review equipment relevant to your product:

• Are machines appropriate for the required processes?
• Is there preventive maintenance scheduling and records?
• For injection molding: injection machine tonnage range, mold maintenance procedures
• For CNC: machine accuracy, number of axes, work envelope
• For electronics: SMT line configuration, reflow oven profile, AOI (Automated Optical Inspection)
• For testing: what functional test equipment is available? Is it calibrated?
• Measurement equipment: CMM (Coordinate Measuring Machine), calipers, micrometers, gauges—availability and calibration status

Note: Not every factory needs a CMM or every type of equipment. Evaluate whether the factory has the equipment needed to make and verify your product.

Documentation and Traceability

Check for:

• Work instructions (SOPs) at each workstation—are they current and accessible?
• Production routing and traceability (batch/lot tracking)
• Inspection records for IQC, IPQC, and OQC
• Material certificates and supplier qualification records
• Tooling maintenance and life tracking
• Document control system (version control, approval workflow)

Workforce and Training

Assess:

• Workforce stability—what is the turnover rate? (High turnover can affect quality consistency)
• Training programs for new operators and ongoing skill development
• Technical staff—how many engineers are on staff? What are their qualifications?
• Operator certification for critical processes (e.g., welding, soldering)

Environmental and Compliance

Review:

• Environmental management systems (e.g., ISO 14001—verify claims with certification body)
• Waste handling and disposal procedures
• Worker safety: PPE usage, safety signage, fire safety equipment
• Compliance with local labor regulations
• Relevant product certifications (e.g., CE, FCC, RoHS—verify authenticity)

Audit Scoring and Decision

After the audit, summarize findings in a structured report:

• Score each category (e.g., 1-5) with specific observations
• Identify critical gaps that would prevent the factory from meeting your requirements
• List improvement opportunities that the factory could address
• Document evidence: photos, document samples, observation notes
• Make a go/no-go decision based on your weighted criteria

A factory that scores poorly in one area may still be a good partner if the gap is addressable and the factory demonstrates willingness to improve. Conversely, a factory that scores well on paper but resists transparency may pose hidden risks.

Use the BOM Cost Calculator alongside the audit findings to model the total cost implications of any quality risks or additional inspection requirements.