🔥 NADCAP
NADCAP-Accredited Special Process Suppliers for Charleston, SC
Special processes are the hidden backbone of aerospace manufacturing, and in the Boeing-driven Charleston market, NADCAP accreditation is what makes them airworthy. Heat treating, welding, chemical processing, and nondestructive testing cannot be verified by inspecting the finished part, so the process itself must be independently audited. This page explains how NADCAP works for Charleston-area aerospace buyers and how to navigate a special-process supply chain that often reaches beyond the metro.
NADCAPAS9100ISO 9001
Why Special Processes Need NADCAP in the 787 Supply Chain
A special process is one whose result cannot be fully verified by subsequent inspection or test of the product, you cannot measure your way to confidence that a heat-treat cycle hit the right metallurgical state or that a weld has the correct fusion below the surface. Because the process determines part integrity, aerospace primes including Boeing require these processes to be performed by NADCAP-accredited suppliers, auditing the process controls rather than just the output.
NADCAP, the National Aerospace and Defense Contractors Accreditation Program, is run by the Performance Review Institute and uses industry-standardized audit criteria developed with the primes. Accreditation is granted by commodity: heat treating, welding, chemical processing (anodize, plating, passivation), nondestructive testing, coatings, and more. A supplier accredited for heat treating is not automatically accredited for welding, the scope is specific.
In the Charleston 787 ecosystem, this means a machined structural part typically passes through one or more NADCAP-accredited special-process steps before delivery. A buyer sourcing the machining locally must understand the entire special-process chain that follows, because a gap in NADCAP coverage anywhere along that chain will stop the part at first article.
Mapping the Special-Process Supply Chain Around Charleston
Charleston's machining and fabrication base is strong, but its local network of NADCAP-accredited special-process houses is still maturing relative to legacy aerospace hubs in the Midwest, Northeast, and Southern California. As a result, Lowcountry machine shops frequently route heat treat, plating, anodize, penetrant inspection, and shot peen to accredited providers in Atlanta, Charlotte, or further afield, then bring the parts back for final inspection and assembly.
This geography has real procurement consequences. Every special-process leg adds freight, transit time, and a handoff where scheduling and documentation must align. A part that needs machining, heat treat, plating, and NDT can accumulate several days of transit alone if those processes sit in different cities. For AOG or tight-schedule aerospace work, mapping this chain in advance is essential to setting realistic lead times.
The sourcing best practice is to treat the special-process chain as part of supplier selection, not an afterthought. When you qualify a Charleston machine shop, ask which NADCAP houses it uses for each commodity, confirm those accreditations are current and cover your specific process specs, and understand the logistics between each step. A shop that has stable, audited relationships with accredited processors is worth more than one that scrambles to find capacity per job.
Verifying Accreditation Scope and Prime Approvals
NADCAP accreditation is verifiable through the PRI's eAuditNet system, which lists accredited suppliers, their commodities, and the specific scope of each accreditation. Always confirm a supplier in eAuditNet rather than accepting a certificate at face value, accreditation can lapse, and the scope is granular. Check that the accreditation covers the exact commodity and, where relevant, the specific process specifications your part requires.
Scope precision matters enormously here. NADCAP accreditation for chemical processing does not necessarily cover every plating type, and heat-treat accreditation may be limited to particular alloy families or furnace classes. A mismatch between the accredited scope and your part's requirement is a common cause of first-article rejection, so map your drawing's process callouts to the supplier's eAuditNet scope line by line.
Layered on top of NADCAP is prime approval. Boeing and other primes maintain their own approved-processor lists and process specifications, and a NADCAP-accredited house may still need specific Boeing approval for a given spec. When sourcing for 787-adjacent work, confirm both the NADCAP scope and the relevant prime approval, because either gap will block the part. This dual verification is the single most important due-diligence step in special-process sourcing.
Documentation and Records From Special-Process Suppliers
Special-process documentation is the proof that an unverifiable process was performed correctly. From a heat treater, expect time-temperature charts for the cycle, furnace and pyrometry records, and hardness or metallurgical test results tied to the lot. From a plating or anodize house, expect process certs documenting bath chemistry control, thickness measurements, and adhesion or coating-weight results. From NDT, expect inspection reports identifying the technique, the certified inspector, and the acceptance criteria applied.
This documentation must trace to your specific lot and flow back through the machine shop to you, that is the AS9100 and NADCAP expectation. A common failure mode is a special-process house that performs good work but produces thin or generic paperwork. For aerospace parts, the records are as important as the process; an undocumented heat-treat cycle is a nonconforming part regardless of how the metal actually turned out.
Make documentation requirements explicit in your purchase orders and confirm the chain before production starts. Because Charleston special-process work often involves multiple out-of-region houses, the documentation handoffs are where records get lost. A buyer who specifies exactly which certs and charts must accompany each lot, and who confirms the machine shop will compile and pass them through, avoids the painful scenario of a finished part that cannot be accepted because its process history is incomplete.
Frequently Asked Questions
A special process is one whose result cannot be fully verified by inspecting or testing the finished product, you cannot confirm by measurement alone that a heat-treat cycle achieved the correct metallurgical state, that a weld has proper subsurface fusion, or that a plating bath deposited a sound coating. Because the integrity of the part depends entirely on how the process was controlled, aerospace primes including Boeing require these processes to be performed by NADCAP-accredited suppliers. NADCAP, run by the Performance Review Institute, audits the process controls themselves against industry-standardized criteria developed with the primes, rather than relying on output inspection. In the Charleston 787 supply chain, this matters because almost every machined structural part passes through one or more special-process steps, heat treat, anodize or plating, penetrant inspection, shot peen, before it can be delivered. A buyer sourcing the machining locally must understand and verify the entire downstream special-process chain, because a gap in NADCAP coverage anywhere along it will stop the part at first-article inspection regardless of how well it was machined.
Charleston's machining and fabrication base is strong and growing, but its local network of NADCAP-accredited special-process houses is still maturing compared with legacy aerospace clusters in the Midwest, Northeast, and Southern California. In practice, many Lowcountry machine shops route heat treating, plating, anodizing, penetrant inspection, and shot peen to accredited providers in Atlanta, Charlotte, or further afield, then bring parts back for final inspection and assembly. This is normal and acceptable, but it has real consequences for lead time and freight, since every special-process leg adds transit time and a scheduling-and-documentation handoff. A part requiring machining, heat treat, plating, and NDT in different cities can accumulate several days of transit alone. The best practice is to treat the special-process chain as part of supplier selection: when qualifying a Charleston machine shop, ask which NADCAP houses it uses for each commodity, confirm those accreditations are current and cover your specific process specs, and understand the logistics between steps. Stable, audited processor relationships are worth more than per-job scrambling.
Use eAuditNet, the system maintained by the Performance Review Institute, which lists NADCAP-accredited suppliers, their commodities, and the specific scope of each accreditation. Always confirm a supplier there rather than accepting a certificate at face value, accreditation can lapse and the scope is granular. The critical step is matching scope to your part. NADCAP accreditation is granted by commodity and is specific: accreditation for chemical processing does not necessarily cover every plating type, and heat-treat accreditation may be limited to particular alloy families or furnace classes. Map your drawing's process callouts to the supplier's eAuditNet scope line by line, because a scope mismatch is a leading cause of first-article rejection. Then verify prime approval separately. Boeing and other primes maintain their own approved-processor lists and process specifications, so a NADCAP-accredited house may still need specific prime approval for a given spec. For 787-adjacent work, confirm both the NADCAP scope and the relevant Boeing approval, since either gap will block the part. This dual check is the most important due-diligence step in special-process sourcing.
The documentation is the proof that an otherwise unverifiable process was performed correctly, so it is as important as the process itself. From a heat treater, expect time-temperature charts for the cycle, furnace and pyrometry records, and hardness or metallurgical results tied to your lot. From a plating or anodize house, expect process certificates documenting bath chemistry control, coating thickness measurements, and adhesion or coating-weight results. From nondestructive testing, expect reports identifying the technique used, the certified inspector, and the acceptance criteria applied. All of this must trace to your specific lot and flow back through the machine shop to you, which is the AS9100 and NADCAP expectation. Because Charleston special-process work often spans multiple out-of-region houses, the documentation handoffs are exactly where records get lost. Specify in your purchase orders precisely which certs and charts must accompany each lot, and confirm the machine shop will compile and pass them through. An undocumented heat-treat cycle is a nonconforming part regardless of how the metal actually turned out, and a part with incomplete process history cannot be accepted.
Last updated: July 2026
Find NADCAP-Certified Manufacturers in Charleston, SC
Search verified Charleston shops that hold NADCAP.
No logins. No email gates. Just results.