NADCAP Accredited Forging and Special-Process Suppliers

NADCAP, the National Aerospace and Defense Contractors Accreditation Program, is run by the Performance Review Institute on behalf of a consortium of primes and OEMs. It accredits suppliers against detailed audit criteria (the AC-series checklists) for individual special processes. A forging is not a single NADCAP commodity; rather, the processes that determine a forging's properties are. The two that touch nearly every aerospace forging are Heat Treating (checklist AC7102, audited to AMS 2750 pyrometry) and Materials Testing (AC7101) for tensile, hardness, impact, and metallographic evaluation. Nondestructive Testing (AC7114 and its method supplements) covers the ultrasonic, fluorescent penetrant, and magnetic particle inspection used to confirm a forging has no internal or surface defects. For machined-from-forging parts, Conventional Machining may also be in scope. There is also a specific accreditation for the forging operation in some commodity structures, but in practice the heat treat and testing accreditations are the ones primes flow down most rigorously, because that is where a metallurgically unsound forging gets caught or missed. The practical takeaway is to think in terms of the process chain, not a single certificate. Map your forging's route: forge, heat treat, test, NDT, machine. Then confirm the NADCAP accreditations exist for each special-process step that requires one, whether performed in-house by the forger or by an accredited subtier. A forger with AS9100 and in-house NADCAP heat treat is a stronger single-source option than one that ships the heat treat to an uncontrolled outside processor.

The reason NADCAP heat-treat accreditation is so valued for forgings is AMS 2750, the aerospace pyrometry specification it audits against. AMS 2750 (current revision AMS 2750G) governs the accuracy and reliability of every temperature-measuring element in the heat-treat system. It defines instrumentation types (from Type A field test instruments down to Type E), sets thermocouple usage and replacement rules, mandates System Accuracy Tests (SAT) to verify the field measurement against a calibrated reference, and requires Temperature Uniformity Surveys (TUS) to prove the working zone of the furnace holds temperature within tolerance. For a forging, this is not academic. The mechanical properties of a quenched-and-tempered alloy steel forging, or the grain structure of a solution-treated and aged titanium or nickel forging, depend entirely on the furnace actually being at the temperature the chart claims. AMS 2750 sets furnace class (Class 1 through 6, by uniformity tolerance) and instrumentation type, and a forging spec will call out the required class. A NADCAP-accredited heat treater has demonstrated to an auditor that its SAT and TUS records, thermocouple correction factors, and calibration chain all conform. This is precisely the rigor that a plain ISO 9001 or even AS9100 certificate does not guarantee. AS9100 requires special-process validation, but it does not by itself mandate AMS 2750 surveys; NADCAP does. When you see a forging requirement that says 'heat treat per AMS 2750, NADCAP accredited,' it is specifying that the temperature was real and proven, not assumed.

NADCAP accreditation is publicly verifiable in eAuditNet, the PRI system, which is the authoritative source. You can look up a supplier and see exactly which commodities and which AC-checklists they are accredited to, the accreditation effective and expiry dates, and any limitations. This is far more transparent than a typical quality certificate, and you should use it. Confirm the accreditation covers the specific process and, where relevant, the alloy or method your forging needs, because a heat treater accredited for steel may not be accredited for the vacuum cycles a titanium forging requires. NADCAP audits run on a baseline 12-month cycle, but strong performers earn merit status, which extends the interval to 18 or 24 months based on a clean audit history. Merit is a useful signal of a mature special-process operation, while a supplier repeatedly held to the 12-month cycle or carrying open findings deserves a closer look. The audits themselves are demanding; a typical heat-treat audit runs job audits against live or recent hardware and scrutinizes every nonconformance to closure. Watch for scope and subtier traps. A forger may hold AS9100 and advertise NADCAP without holding the accreditation in-house, relying on an accredited subtier. That is acceptable if the chain is documented, but you must confirm it rather than assume it. The classic mismatch is an accreditation that has expired or that covers a different method or temperature range than your spec calls out. eAuditNet lets you catch all of these before you place the order.