🔥 NADCAP
NADCAP Accredited Special Process Suppliers in Flint, MI
NADCAP is where special processes get held to aerospace and defense standards, and for a Flint-area buyer that means heat treating, welding, surface finishing, and nondestructive testing performed to a level far above general industrial practice. Flint knows metal processing in its bones from its automotive past, but NADCAP accreditation is a different bar entirely, audited against detailed industry checklists rather than a single generic standard. This page covers how NADCAP works, how to verify a processor's accreditations, and why special-process control is so often the weak link in a regional supply chain.
NADCAPAS9100ISO 9001
How NADCAP Accreditation Actually Works
NADCAP, run by the Performance Review Institute on behalf of the aerospace and defense industry, accredits special processes rather than whole companies in the way a quality certification does. A processor is accredited for specific commodities such as heat treating, welding, chemical processing, coatings, or nondestructive testing, and each is audited against a detailed Audit Criteria checklist specific to that process. A shop is not simply 'NADCAP certified'; it holds accreditations for the particular processes it has passed.
This matters enormously for a buyer. A Flint processor accredited for heat treating is not automatically accredited for welding or NDT, and assuming otherwise is a common and costly error. The accreditation is also tightly tied to the specific procedures, equipment, and operators audited, so the scope is narrower and more technical than a general quality certificate.
NADCAP audits are demanding and recurring. The audits go deep into pyrometry for heat treat, weld procedure qualification, solution concentrations and process control for chemical processing, and operator certification for NDT. Initial accreditation often involves findings that must be closed before approval, and surveillance continues on a defined cycle. The rigor is the point: it is what lets a prime trust a processed part without re-auditing every supplier itself.
Verifying Accreditations Through eAuditNet
NADCAP accreditations are recorded in eAuditNet, the database maintained by the Performance Review Institute. This is the authoritative source for confirming whether a Flint processor holds a current accreditation and exactly which processes and subscopes it covers. When a supplier claims NADCAP status, verify it in eAuditNet and read the accreditation scope line by line, because the subscopes determine what the processor is actually approved to do.
Accreditation alone may not be sufficient. Many aerospace primes maintain their own approved-processor lists and require that a NADCAP-accredited supplier also hold that specific customer's approval. So a complete verification has two parts: confirm the NADCAP accreditation in eAuditNet, then confirm the processor carries any customer-specific approvals your program requires. A Flint processor experienced in aerospace will know exactly which prime approvals it holds.
Pay attention to accreditation status and merit. NADCAP can grant longer accreditation intervals to processors with strong audit histories and shorter intervals to those with recurring findings, which is itself a useful signal of process maturity. A processor with a clean, long-interval accreditation history is generally a lower-risk partner than one repeatedly on short cycles.
Special Processes Are the Hidden Risk in Regional Sourcing
When a buyer sources a machined or fabricated aerospace part in the Flint area, the special processes are frequently where the supply chain breaks down. A capable machining shop may produce a flawless part dimensionally, then send it for heat treat or finishing to a processor that lacks the required NADCAP accreditation, which invalidates the part for aerospace use. The special-process tier is often invisible until you trace it.
This is why mapping the special-process chain early is essential. Ask your primary Flint supplier which processes are subcontracted, to whom, and whether each subcontractor holds the relevant NADCAP accreditation and customer approvals. Heat treating with controlled pyrometry, welding to a qualified procedure, NDT by certified operators, and chemical processing with documented bath control all carry specific accreditation requirements that a general industrial processor will not meet.
Flint's automotive heritage cuts both ways here. The region has abundant heat-treat, welding, and finishing capability, but much of it was built for automotive rather than aerospace requirements. The capability exists; the accreditation may not. A buyer's job is to confirm which local processors have made the investment to operate at NADCAP level versus those running competent but unaccredited automotive-grade processes.
What Documentation a NADCAP Process Should Produce
A NADCAP-accredited process generates records that prove the process ran within its controlled parameters, and you should receive evidence of that control. For heat treating, expect furnace charts, pyrometry and system accuracy test records, and certification that the cycle met the specification. The temperature uniformity survey and instrument calibration records behind those charts are what give the heat-treat certification its weight.
For welding, expect qualified weld procedure specifications, welder qualification records, and inspection results tied to the applicable specification. For nondestructive testing, expect operator certification levels, the technique used, and documented acceptance against the specified criteria. For chemical processing and coatings, expect bath control logs, thickness measurements, and adhesion or other functional test results as required.
These records are not paperwork for its own sake; they are the chain of evidence that lets a part be accepted into flight or defense hardware without re-testing. Retain them in your file tied to the part lot. If a Flint processor cannot readily produce the underlying process records behind its certifications, the accreditation is not being run as a living system and the risk to your program is real.
Frequently Asked Questions
No, and this is one of the most important things to understand about NADCAP. Accreditation is granted process by process against detailed, commodity-specific audit checklists, not to the company as a whole. A Flint processor accredited for heat treating is not automatically accredited for welding, nondestructive testing, or chemical processing, and assuming a blanket accreditation is a common and costly mistake. Each accreditation also carries specific subscopes that define exactly which variations of the process are covered, such as particular heat-treat specifications or NDT methods. When you evaluate a processor, identify the exact special processes your part requires and verify in eAuditNet that the supplier holds a current accreditation covering each one, including the relevant subscopes. A processor may genuinely hold NADCAP for one process while running an unaccredited operation for another, and only the accredited process is acceptable for aerospace or defense work. Read the accreditation scope carefully rather than relying on a general claim of NADCAP status, because the gap between what a shop claims and what it is actually accredited to do can invalidate your part.
NADCAP accreditations are recorded in eAuditNet, the database maintained by the Performance Review Institute, which is the authoritative source. Search the supplier in eAuditNet, confirm the accreditation is current, and read the scope to verify it covers the specific process and subscopes your part requires. Verification often has a second step: many aerospace primes maintain their own approved-processor lists and require that a NADCAP-accredited supplier also hold that specific customer's approval for the process. So confirm both the NADCAP accreditation and any customer-specific approvals your program mandates. It is also worth noting the accreditation interval, because NADCAP grants longer intervals to processors with strong audit histories and shorter ones to those with recurring findings, which signals process maturity. A processor on a clean long-interval cycle is generally lower risk than one repeatedly on short cycles. When a Flint supplier claims NADCAP status but cannot point you to a current eAuditNet accreditation matching your process, treat that as disqualifying regardless of any other documentation, because eAuditNet is the system the entire aerospace industry relies on for this verification.
Special processes are where parts most often fall out of compliance because they are usually subcontracted and easy to overlook. A Flint machining shop can produce a dimensionally perfect aerospace part and then send it for heat treat, plating, or NDT to a processor that lacks the required NADCAP accreditation, which invalidates the part for aerospace use no matter how good the machining was. The special-process tier is frequently invisible until you trace the routing explicitly. Flint compounds this because its automotive heritage left the region rich in heat-treat, welding, and finishing capability that was built for automotive rather than aerospace requirements. The capability exists, but the accreditation often does not. The fix is to map the special-process chain early in qualification: ask your primary supplier which processes are subcontracted, to whom, and confirm each subcontractor holds the relevant NADCAP accreditation and customer approvals in eAuditNet. Treat the special-process suppliers as part of your qualification scope, not as an afterthought. A buyer who controls the special-process chain avoids the most common and most expensive aerospace sourcing failure, which is discovering after delivery that an unaccredited process touched the part.
A NADCAP-accredited process should produce records that demonstrate it ran within its controlled, audited parameters. For heat treating, that means furnace charts for the cycle, pyrometry records including temperature uniformity surveys and system accuracy tests, instrument calibration records, and certification that the cycle met the applicable specification. The pyrometry behind the charts is what gives a heat-treat certification its credibility, because temperature control is the heart of the process. For welding, expect qualified weld procedure specifications, welder or operator qualification records, and inspection results tied to the governing specification. For nondestructive testing, you want the operator's certification level, the technique used, and documented acceptance against the specified criteria. For chemical processing and coatings, expect bath control logs, thickness measurements, and any required adhesion or functional test data. These records form the chain of evidence that allows a processed part to enter flight or defense hardware without re-testing, so retain them in your file linked to the specific part lot. If a Flint processor cannot readily produce the underlying process data behind its certifications, the accreditation is not functioning as a living quality system and the risk to your program is significant.
Last updated: July 2026
Find NADCAP-Certified Manufacturers in Flint, MI
Search verified Flint shops that hold NADCAP.
No logins. No email gates. Just results.