🔥 NADCAP

NADCAP Accredited Special-Process Suppliers Near Spartanburg, SC

NADCAP is the most misunderstood accreditation a Spartanburg buyer encounters, because it does not certify a company, it accredits specific special processes, one audit scope at a time. A heat treater can be NADCAP accredited for one process and not another, and buying the wrong scope is a costly mistake in aerospace and critical work. Given Spartanburg's dense special-process activity, heat treating, plating, and welding feeding the automotive and heavy-equipment sectors, this guide explains how NADCAP accreditation works, how to verify the exact process you need, and where the local special-process base meets aerospace-grade requirements.

NADCAPAS9100ISO 9001
NADCAP, the National Aerospace and Defense Contractors Accreditation Program administered by the Performance Review Institute, accredits special processes against rigorous industry-consensus audit criteria. A special process is one whose result cannot be fully verified by subsequent inspection of the finished part, so the process itself must be controlled and validated. Heat treating, chemical processing and plating, welding, nondestructive testing, coatings, and chemical milling are classic examples. NADCAP audits these processes through dedicated task groups, each with its own checklist. The critical point for buyers is granularity. NADCAP accreditation attaches to a specific process at a specific facility, not to the company as a whole. A Spartanburg heat treater might hold NADCAP for vacuum heat treating but not for nitriding, or a plating shop might be accredited for one chemical process and not another. There is no such thing as a generically NADCAP-accredited company; there are companies accredited for an enumerated list of processes. Buying from a shop because it is on the NADCAP list, without confirming your exact process is in scope, is a frequent and expensive error. Spartanburg generates substantial special-process volume because its automotive and heavy-equipment manufacturers need heat treating, surface finishing, and welding at scale. Where that work intersects aerospace or other critical applications, the demand for NADCAP-accredited capacity, rather than merely commercial special-process capacity, becomes acute.

Using the eAuditNet Directory to Confirm Exact Scope

NADCAP gives buyers an authoritative verification tool: eAuditNet, the PRI-operated database where every accreditation is recorded. Unlike ITAR, NADCAP status is verifiable, and unlike a simple certificate, eAuditNet lets you confirm exactly which processes a supplier is accredited for. Before engaging a Spartanburg special-process supplier, look them up in eAuditNet and confirm the specific process, and where applicable the specific specification or commodity, you require is in their active accreditation. This matters because accreditation scopes are specific to the point of being unforgiving. A welding accreditation may cover certain welding methods and materials and not others; a heat-treat accreditation may cover certain furnace types or specifications. Match your part's process requirements, including the exact prime or industry specification it calls out, against the supplier's accredited scope. If your aerospace drawing calls a specific heat-treat spec, confirm that spec sits inside the supplier's eAuditNet accreditation, not just that they do heat treating. Also check accreditation merit status and audit history where visible. NADCAP rewards strong performers with longer intervals between audits, so a supplier's standing in the program is itself a quality signal. A current, in-scope, good-standing accreditation in eAuditNet is the verification that holds up when your customer audits your supply chain.

How NADCAP Fits Alongside AS9100 and Your Quality System

Buyers routinely confuse the roles of AS9100 and NADCAP, and getting the relationship right is essential to a complete aerospace qualification. AS9100 Rev D accredits the overall quality management system of a manufacturer; NADCAP accredits individual special processes. They are complementary, not interchangeable. An AS9100 machine shop in the Spartanburg area can machine your aerospace part under its quality system, but the heat treat, plating, or NDT that part needs must be performed by a source holding NADCAP accreditation for that exact process. This is why mapping the full process chain is non-negotiable. For a typical aerospace component, the machining falls under AS9100, the special processes fall under NADCAP, and if the part is defense-controlled, ITAR flows alongside. A Spartanburg supplier that performs special processes in-house should hold the relevant NADCAP accreditations directly; one that subcontracts them must flow the requirement to a NADCAP-accredited subtier and document it. For a buyer, the practical takeaway is to build a qualification matrix per part: AS9100 for the quality system, NADCAP for each special process by exact spec, and the documentation trail tying them together. A part can be machined by a perfectly good AS9100 shop and still be rejected by the prime because the heat treat went to a source whose NADCAP scope did not cover the called-out specification.

Frequently Asked Questions

It applies to specific processes, never to a company as a whole, and misunderstanding this causes real procurement failures. NADCAP accredits individual special processes at a specific facility against detailed audit criteria, one process and often one specification at a time. There is no such thing as a generically NADCAP-accredited company. A Spartanburg heat treater might be accredited for vacuum heat treating but not nitriding; a plating shop might hold accreditation for one chemical process and not another; a welding source might be accredited for certain methods and materials and not others. So when a supplier says they are NADCAP accredited, the correct response is to ask which processes and which specifications, then verify that the exact process your part requires is in their active scope. Selecting a shop simply because it appears on the NADCAP list, without confirming your specific process and specification are covered, is one of the most common and expensive mistakes buyers make in aerospace and critical-process sourcing.
Use eAuditNet, the database operated by the Performance Review Institute that records every NADCAP accreditation. Unlike ITAR registration, NADCAP status is genuinely verifiable, and eAuditNet lets you confirm exactly which processes a supplier holds accreditation for rather than just that they are in the program. Before engaging a Spartanburg special-process supplier, look them up in eAuditNet and confirm the specific process you need, including the exact prime or industry specification your drawing calls out, sits inside their active accreditation. This precision matters because scopes are unforgiving: a heat-treat accreditation may cover certain furnace types or specifications and not others, and a welding accreditation may cover specific methods and materials only. Match your part's full process requirements against the supplier's accredited scope line by line. While you are there, check the supplier's accreditation merit status and audit history if visible, since NADCAP grants longer audit intervals to strong performers, making program standing a useful quality signal. A current, in-scope, good-standing accreditation is the verification that survives a customer audit.
They serve different purposes and aerospace work usually requires both. AS9100 Rev D accredits a manufacturer's overall quality management system; it governs how the company runs quality across the board. NADCAP accredits individual special processes such as heat treating, plating, welding, and nondestructive testing, each against its own detailed audit criteria. They are complementary, not interchangeable. A Spartanburg AS9100 machine shop can machine your aerospace part under its quality system, but any heat treat, plating, or NDT that part requires must be performed by a source holding NADCAP accreditation for that exact process and specification. The practical implication is that you must map the full process chain for each part: AS9100 for the quality system, NADCAP for every special process by exact spec, and if the part is defense-controlled, ITAR alongside. A part can be machined by an excellent AS9100 shop and still be rejected by the prime because the heat treat went to a source whose NADCAP scope did not cover the called-out specification. Always qualify the special-process subtiers, not just the machine shop.
Spartanburg's industrial base generates large volumes of special-process work because its automotive and heavy-equipment manufacturers need heat treating, surface finishing, plating, and welding at scale. BMW's plant and the surrounding supplier cluster drive demand for hardened and coated components, structural weldments, and finished parts, which supports a real local population of heat treaters, finishers, and welding sources. Most of that capacity serves commercial automotive and industrial requirements rather than aerospace. The relevance to NADCAP comes where that special-process work intersects aerospace or other critical applications that demand accredited rather than merely commercial processes. Some local special-process suppliers have pursued NADCAP accreditation to serve aerospace customers within freight range of the Upstate, and the underlying process competence, controlled heat-treat furnaces, validated plating lines, qualified welders, transfers from automotive to aerospace once the NADCAP discipline is added. For a buyer, this means the Spartanburg area can be a viable source for accredited special processes, but you must verify each supplier's exact scope in eAuditNet rather than assuming aerospace capability from industrial volume.

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Last updated: July 2026

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