🔥 NADCAP
NADCAP Accredited Special Process Sources Near Raleigh, NC
Special processes are where most aerospace and defense parts pass or fail, and NADCAP is the accreditation that proves a processor runs them to industry-controlled standards. For a Raleigh-area buyer, NADCAP comes into play the moment a machined part needs heat treatment, nondestructive testing, welding, or surface finishing for a flight or defense program. Because these operations rarely happen inside the machine shop, understanding how to qualify and route NADCAP work is essential to keeping a Triangle aerospace supply chain compliant and on schedule.
NADCAPAS9100ISO 9001
What NADCAP Accredits and Why It Exists
NADCAP, the National Aerospace and Defense Contractors Accreditation Program, exists because certain manufacturing processes cannot be fully verified by inspecting the finished part. You cannot measure your way to confidence that a heat-treated part has the right metallurgical structure, that a weld is internally sound, or that a chemical-conversion coating was applied correctly. NADCAP accredits the processors who perform these special processes against industry-defined audit criteria, giving primes and buyers assurance the process was controlled.
The accreditation is process-specific. A processor is accredited for heat treating, or nondestructive testing, or welding, or chemical processing and coatings, not for everything at once. For a Raleigh buyer, this means you do not look for 'a NADCAP shop' in the abstract; you look for accreditation in the specific commodity your part needs. A part requiring both heat treat and NDT may pass through two different NADCAP-accredited processors, each accredited for its respective process.
How NADCAP Fits the Triangle Aerospace Supply Chain
Raleigh's manufacturing strength is precision machining, inspection, and assembly driven by semiconductor and medical demand, with a defense-electronics and aerospace layer on top. The AS9100 machine shops serving that aerospace layer typically do not perform special processes in-house. Instead, they manage a network of NADCAP-accredited processors, some regional, some elsewhere in North Carolina or out of state, through their approved-supplier lists.
This routing shapes how a Triangle aerospace part actually gets built. A machined detail might be cut locally, sent out for NADCAP heat treat, returned, sent out again for NADCAP NDT, then come back for final inspection and certification at the AS9100 shop. As a buyer, you usually do not contract the NADCAP processors directly, the AS9100 shop does, but you should understand and approve that chain. Knowing which special processes your part needs, and confirming each routes to a properly accredited source, is part of qualifying your supply chain rather than just qualifying one shop.
Reading a NADCAP Accreditation and Matching It to Your Part
NADCAP accreditations are managed through the Performance Review Institute, and accreditation status is verifiable. When you or your AS9100 supplier qualify a special-process source, confirm the processor holds current accreditation in the specific commodity, heat treating, welding, nondestructive testing, surface enhancement, chemical processing, or whichever applies to your part, and that the accreditation covers the specific methods you need. NDT, for example, spans penetrant, magnetic particle, radiographic, ultrasonic, and other methods, and accreditation may be method-specific.
The common mismatch is assuming a processor's NADCAP status blankets every variant of a process when it covers only certain methods or specifications. Verify the accreditation against your engineering requirements: the specific spec callout on your drawing, the alloy or material, and the method. A processor accredited for one heat-treat specification or one NDT method may not be accredited for the exact requirement your flight part carries. Match the accreditation scope to the drawing, the same discipline you apply to a quality certificate's scope.
Lead Time, Routing, and Documentation Realities
NADCAP special processes are a major driver of aerospace lead time, and Raleigh-area buyers should plan for it. Each special-process stop adds transit time to and from the accredited processor plus that processor's own queue, and aerospace special-process houses commonly carry backlogs. A part requiring machining, heat treat, NDT, and finishing accumulates real schedule time at each accredited stop. Building these durations into your program timeline up front prevents the surprise of a part that machined in days but spent weeks moving through the special-process chain.
On documentation, every NADCAP process must return certifications that flow into your part's data package: the process certification, the specification and revision it was performed to, and traceability connecting it to your specific lot or serial numbers. Your AS9100 supplier collects these from the NADCAP processors and includes them in the delivery package. Write into your purchase order that all special-process certifications are required deliverables, and for new or changed processes, confirm how re-verification is handled, since a change in process source or method can require re-qualification before your part is compliant again.
Frequently Asked Questions
In most aerospace and defense supply chains around Raleigh, your AS9100 machine shop manages the NADCAP processors, not you directly. The machine shop maintains an approved-supplier list of NADCAP-accredited heat treaters, NDT houses, welders, and finishers, routes your part through them as the drawing requires, and collects the resulting process certifications into your delivery package. That said, as the buyer you should understand and approve the chain rather than treat it as a black box. Confirm which special processes your part needs, ask the machine shop which NADCAP-accredited sources they use for each, and verify those sources hold current accreditation in the specific commodity and method your drawing calls out. For sensitive or controlled programs, you may also need those special-process sources to be inside your ITAR-controlled chain. The machine shop owning the routing simplifies your contracting, but qualifying your supply chain means confirming the full process flow, not just the lead shop, meets your requirements.
NADCAP accreditation is administered by the Performance Review Institute, and accreditation status is verifiable rather than self-declared, which gives you a real check. When qualifying a special-process source, confirm three things. First, the processor holds current NADCAP accreditation, not lapsed, in the specific commodity your part needs, whether that is heat treating, nondestructive testing, welding, surface enhancement, or chemical processing. Second, the accreditation covers the specific method and specification on your drawing, since processes like NDT are method-specific and a source accredited for penetrant testing may not be accredited for radiographic. Third, the accreditation scope matches your material and the exact specification revision your engineering calls out. The frequent and costly error is assuming a processor's NADCAP status blankets every variant of a process when it covers only certain methods or specs. Match the accreditation to the drawing requirement the same way you read a quality certificate's scope. Your AS9100 supplier typically performs this verification, but you should confirm it as part of qualifying the supply chain.
It can add weeks, and it is one of the most underestimated drivers of aerospace lead time. A Raleigh-area machine shop may cut your part in days, but each NADCAP special process adds transit time to and from the accredited processor plus that processor's own queue time, and aerospace special-process houses frequently run backlogs. A part needing machining, then heat treat, then NDT, then a finishing or coating operation passes through multiple accredited stops, each with its own shipping and scheduling overhead, before returning for final inspection and certification. Because these processors are often elsewhere in North Carolina or out of state, the logistics legs add up. The way to manage this is to map the full process flow at the start of the program and ask your AS9100 supplier for realistic durations at each NADCAP stop, including expected queue times, rather than planning around machining hours alone. Building the special-process chain into your schedule from day one is what keeps a flight-hardware program on time.
Every NADCAP special process must return certifications that become part of your part's traceable data package, because the whole point of the accreditation is to document that a non-verifiable process was performed under control. For each special process, expect a process certification stating the specification and revision the work was performed to, confirmation it was done by the accredited source, and traceability connecting the process to your specific lot or serial numbers. For heat treat, that may include the process parameters and the specification met; for NDT, the method, technique, and acceptance results; for finishing or chemical processing, the specification and any required thickness or coverage verification. Your AS9100 machine shop collects these certifications from the NADCAP processors and folds them into your overall delivery package alongside the certificate of conformance, material traceability, and first-article report. Write into your purchase order that all special-process certifications are required deliverables, and define how re-verification is handled when a process source or method changes, since such changes can require re-qualification before the part is compliant.
Last updated: July 2026
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