NADCAP Accredited Special Process Suppliers in Greenville, SC

NADCAP accredits specific special processes against technical audit criteria written by the aerospace primes, while AS9100 certifies a supplier's overall quality management system. The two are complementary, not interchangeable. A shop can hold AS9100 for its quality system and still need NADCAP accreditation for any special process it performs, such as heat treatment, nondestructive testing, welding, chemical processing, or coatings. Special processes are defined as those whose results cannot be fully verified by later inspection, which is why the industry created a dedicated, more technical audit program for them through the Performance Review Institute. The accreditation is granted per process and even per method within a process, so a supplier accredited for penetrant inspection is not automatically accredited for radiography. For a buyer, the takeaway is that AS9100 tells you the quality system is sound, but only a matching NADCAP accreditation tells you the specific special process on your part was audited to the industry's own technical requirements. On flight and turbine hardware, you need both.

NADCAP accreditations are maintained in eAuditNet, the Performance Review Institute's system, which is the authoritative source for confirming a supplier's status. Look the supplier up there to see the exact commodities and methods they hold and the validity dates, rather than relying on a certificate image. The verification matters more than with a typical certificate because NADCAP is granular: accreditation is per process and per method, so you must confirm the supplier holds the specific operation your part requires. A heat treater accredited for vacuum heat treat may not hold the atmosphere process you need, and an NDT lab with penetrant accreditation may not hold radiography. Match the accreditation scope to your exact specification and method before committing. Also confirm the accreditation is current, since these are renewed on a cycle and can lapse. In Greenville's corridor, the credible special-process houses will point you straight to their eAuditNet listing, and a supplier that is vague about which specific methods they hold is a warning sign on aerospace work.

Each special process is a separate accredited stop with its own queue, and the time stacks. A typical aerospace part might machine first, then route to a NADCAP heat treater, then to a NADCAP NDT lab, then to a coating source, with transit between each stop. Every one of those sources runs to its own production schedule, and none of them can be rushed without compromising the audited process. During periods of strong aerospace and turbine demand, which Greenville sees regularly given GE Gas Power and the regional defense work, those queues lengthen further. The corridor's density helps because most of these stops can stay regional, keeping transit short and letting a buyer audit the whole chain in one trip, but the cumulative queue time is unavoidable. The way to manage it is to map the full process routing up front, confirm capacity at each NADCAP source early, and build the realistic cumulative lead time into your delivery commitment rather than treating each special process as instant.

Both models exist, and which one fits depends on how your supply chain is structured. In many aerospace builds, the machine shop owns the routing and flows the special-process requirements down to NADCAP-accredited sources on its own approved supplier list, delivering you a finished part with all the special-process documentation included. In that case you verify that your machine shop is AS9100 certified and that it controls its subcontracted special processes properly. Alternatively, a buyer may source special processes directly, especially when consolidating spend or qualifying specific accredited sources across multiple parts. Either way, the buyer's job is to confirm that every special-process stop in the routing holds the correct NADCAP scope for the exact method involved. In Greenville, the geographic density of accredited heat treaters, NDT labs, and coating houses makes both models workable, and a strong machine shop will be transparent about which special processes it performs in-house versus subcontracts and will produce the NADCAP certificates as part of the package.