Manufacturing Supplier Audit

Walk the process. Verify how production actually works.

Use this checklist to review a manufacturing supplier's facility, materials, equipment, production controls, inspection, calibration, traceability, maintenance, capacity, documentation, and supply-chain practices.

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Follow material and information through the actual manufacturing flow.

The depth of an audit should reflect program risk. A simple commercial component may require less review than a critical, highly controlled, or technically demanding production program.

Facility & General Capability

Confirm that the facility and operating environment match the work being considered.

Facility size and layout support the production scope. Receiving, production, inspection, storage, packaging, and shipping areas are appropriate for the work.

Required manufacturing equipment is present. Machines, presses, molding systems, fabrication equipment, assembly stations, or other required capabilities are available.

Part size and weight are within practical capability. Machine envelope, crane capacity, workholding, floor space, inspection, and shipping limitations are understood.

Housekeeping and organization support controlled production. Material, tooling, work-in-process, finished goods, scrap, and inspection areas are identifiable.

Receiving & Material Control

Review how incoming materials and components are identified and controlled.

Incoming material is identified. Part number, grade, lot, heat, batch, supplier, quantity, or other required information is controlled.

Material certifications are reviewed where required. Certificates are connected to the appropriate received material and retained when necessary.

Material is stored appropriately. Environmental, contamination, shelf-life, segregation, damage, or handling requirements are addressed.

Substitution is controlled. Production personnel cannot informally replace specified materials or purchased components without appropriate approval.

Production Control

Observe how released requirements reach machines, operators, and workstations.

Current work instructions are available. Operators have access to the correct drawings, revisions, setup information, process instructions, or travelers.

Production status is identifiable. Work-in-process can be distinguished by job, part, revision, lot, operation, or inspection status where necessary.

Special processes are controlled. Heat treatment, coating, welding, plating, testing, or other special operations follow defined requirements.

Process changes are managed. Equipment, tooling, method, material, outside processor, location, or other meaningful changes follow defined review.

Inspection & Measurement

Verify the supplier can measure and document the requirements it agrees to manufacture.

Required inspection equipment is available. Calipers, micrometers, CMMs, gauges, test systems, optical equipment, or other necessary tools match the product.

Inspection methods are defined. Operators and inspectors understand when, where, and how product characteristics are verified.

Measurement equipment calibration is controlled. Calibration status, identification, due dates, out-of-tolerance handling, and records are maintained.

Inspection records can be retained when required. First articles, dimensional reports, test results, or production inspection data can be connected to the correct product.

Nonconforming Product

Review what happens when production does not meet requirements.

Nonconforming product is identified and segregated. Rejected or suspect material cannot easily return to normal production accidentally.

Disposition authority is defined. Use-as-is, rework, repair, deviation, return, and scrap decisions follow appropriate approval.

Corrective action is used for recurring or significant problems. Containment, root-cause analysis, action, verification, and follow-up can be demonstrated where appropriate.

Customer notification requirements are understood. The supplier knows when deviations, escapes, or significant issues require customer communication.

Maintenance & Tooling

Confirm that production assets can support repeatable operation over time.

Critical equipment maintenance is planned. Preventive maintenance, service, repair, lubrication, or replacement activities are defined for important equipment.

Customer tooling is identifiable where applicable. Molds, dies, fixtures, gauges, or other customer-owned assets can be distinguished and controlled.

Tooling condition is monitored. Wear, repair, maintenance, storage, spare parts, and expected replacement can be managed.

Critical equipment failure risks are understood. Single machines or unique tools that could stop production are identified.

Capacity & Scheduling

Verify that available capacity supports forecast demand, not only the first order.

Required machine capacity is available. Equipment loading and existing production commitments have been considered.

Labor supports planned production. Operators, programmers, inspectors, assemblers, maintenance, and engineering resources are considered.

Bottleneck operations are known. Inspection, finishing, outside processing, tooling, material, labor, or another supporting step does not limit output unexpectedly.

Forecast growth has been reviewed. The supplier can explain how production could scale if future demand increases.

Subsuppliers & Supply Continuity

Understand which parts of the manufacturing chain exist outside the audited facility.

Outside processors are identified. Heat treaters, finishers, laboratories, toolmakers, specialty processors, or other subsuppliers are known.

Requirements are flowed to subsuppliers. Relevant specifications, revisions, certifications, testing, traceability, or quality requirements follow outsourced work.

Long-lead inputs are understood. Special materials, components, castings, forgings, electronics, tooling, or outside processes that control schedule are identified.

Continuity risks are discussed. Single-source suppliers, critical equipment, geographic concentration, specialized labor, and contingency options have been considered.

After the Audit

Document evidence, gaps, owners, and follow-up actions.

Record objective observations

Separate direct observations and records from assumptions or impressions.

Identify program-specific gaps

A supplier can have a strong general system while still lacking one capability required by the specific project.

Assign corrective actions

Define the issue, responsible party, expected evidence, and timing before approval where necessary.

Define the approved scope

Supplier approval can be limited to particular processes, materials, facilities, product types, or production conditions.

Revisit meaningful changes

New equipment, ownership, facility moves, major quality issues, capacity changes, or new processes may justify future review.

An audit is one part of supplier qualification.

Combine facility evidence with technical capability, quality systems, commercial fit, capacity, communication, samples, and production performance.

Supplier Qualification Guide →