🔥 NADCAP
NADCAP-Accredited Special Process Suppliers in St. Louis, MO
In St. Louis aerospace, the part that machines in three days can sit two weeks waiting on a special process, and that's where NADCAP lives. NADCAP accredits the controlled operations, heat treating, nondestructive testing, chemical processing, coatings, welding, that aerospace primes won't accept without an independent, process-specific audit. For a buyer sourcing flight hardware in this metro, understanding NADCAP isn't optional, because the special-process layer is usually the critical path and the place a program either stays on schedule or slips.
NADCAPAS9100ISO 9001
NADCAP, the National Aerospace and Defense Contractors Accreditation Program, is run by the Performance Review Institute and accredits special processes against industry-consensus audit criteria. Crucially, it accredits by process, not by company, a supplier can be NADCAP-accredited for heat treating but not for nondestructive testing, or for chemical processing but not for coatings. Each accreditation is earned and maintained through PRI audits, and aerospace primes including Boeing require it for the controlled operations on their parts.
In St. Louis, where the supply base feeds active military aircraft programs, this matters constantly. A machined titanium fitting may require heat treatment to spec, penetrant or radiographic inspection, and a protective coating, three distinct NADCAP processes, before it's acceptable hardware. The region has a real ecosystem of accredited processors built up around the cluster, but that ecosystem also serves the whole base, so the accredited capacity for any given process is a shared, finite resource. Buyers who understand which processes their parts touch, and who holds accreditation for them, source far more reliably than those who treat 'NADCAP' as a single yes/no checkbox.
Verifying Accreditation by Process, Not by Logo
The single most important NADCAP verification habit is checking accreditation per process. PRI maintains an online directory, eAuditNet, where buyers can confirm a supplier's accreditations, the specific processes and commodities covered, and the current status of each. Before routing a part, confirm the supplier holds a current accreditation for the exact process and the relevant specification your drawing calls out, not just a general NADCAP listing.
The common mismatch: a shop advertises 'NADCAP accredited' but its accreditation covers, say, fluorescent penetrant inspection while your part needs radiographic inspection, or it's accredited for steel heat treat but your part is titanium with different spec requirements. Drawings flow down specific process specs, AMS, Boeing process specs, and similar, and NADCAP accreditation has to match those. Also confirm the accreditation isn't in a probationary or suspended state. A St. Louis processor that genuinely serves the aerospace cluster will be in eAuditNet with clean, specific accreditations and will expect you to verify them. If a supplier can't point you to its eAuditNet entry for the exact process you need, that's the signal to dig deeper.
Managing Special-Process Lead Time in the Cluster
Because NADCAP-accredited capacity is shared across the St. Louis aerospace base, special processes are usually the lead-time pressure point, not machining. When Boeing programs ramp, heat-treat and NDT queues lengthen for everyone, and a part that's done at the spindle can wait days or weeks for an accredited processor to take it. Treating special processes as the critical path, from the first quote, is the difference between a predictable schedule and a surprise slip.
The practical moves: ask processors about current queue times for your specific process, plan routing so heat treat and inspection are sequenced realistically rather than assumed instant, and prefer sourcing chains where machining and accredited processing are both local so parts don't burn days in freight between operations. Some buyers qualify a primary and backup accredited processor for their highest-volume processes to keep leverage when the cluster is busy. Keeping the whole chain inside the metro also lets you physically expedite a hot part, which is impossible when an operation sits three states away.
Documentation a NADCAP Process Should Return
A NADCAP-accredited process should return certifications that tie the specific operation to your part and the governing spec. For heat treat, expect a cert citing the process spec, the actual cycle parameters or furnace data where required, and any associated hardness or metallurgical results. For NDT, expect inspection records identifying the method, technique, acceptance criteria, and the certified inspector. For coatings or chemical processing, expect a cert citing the spec, thickness or coverage results where applicable, and traceability to the processed lot.
These certs become part of your part's overall conformance package and your AS9100 supplier's traceability chain. As a buyer, confirm that the processing certs reference the same drawing and revision as the machining, that the spec called out on the cert matches your print exactly, and that the cert is traceable to the NADCAP-accredited facility and operation. Mismatches here, a cert citing a superseded spec, or processing done outside the accredited scope, are exactly what a prime's source inspection or your own incoming audit will catch. A mature St. Louis processor produces these documents as routine output, not as a special request.
Frequently Asked Questions
NADCAP accredits per process, not per company, and getting this right is the core of sourcing it correctly. A supplier earns accreditation for specific processes, heat treating, fluorescent penetrant inspection, radiographic inspection, anodizing, chemical processing, welding, and each is audited and maintained separately by the Performance Review Institute. So a shop can legitimately be NADCAP-accredited for one process and have no accreditation at all for another. 'NADCAP certified' as a blanket label is misleading. When you verify a St. Louis supplier, use PRI's eAuditNet directory to confirm the exact processes and commodities accredited, the governing specifications covered, and the current status of each accreditation. Then match those against what your drawing actually calls out: if your part needs radiographic inspection of titanium to a specific AMS or Boeing process spec, an accreditation for steel penetrant inspection doesn't cover it. Verifying by process against your specific spec is what prevents a part from getting rejected at source inspection because it was processed outside an accredited scope.
The authoritative source is eAuditNet, the online system maintained by the Performance Review Institute, which administers NADCAP. In eAuditNet you can search a supplier and see the specific processes it's accredited for, the commodities and specifications those accreditations cover, and the current status, active, probationary, or suspended, of each. Always verify against your part's actual requirements rather than accepting a general 'NADCAP accredited' claim. Confirm three things: that the supplier holds a current, non-suspended accreditation for the exact process your drawing calls out, that the accreditation covers the relevant specification (AMS, Boeing process spec, or similar) named on your print, and that the commodity matches, since material families like steel and titanium can carry different requirements. A St. Louis processor that genuinely serves the aerospace cluster will appear in eAuditNet with clean, specific accreditations and will expect buyers to verify them. If a supplier can't direct you to its eAuditNet listing for the precise process you need, treat that as a reason to investigate further before routing controlled work.
Because NADCAP-accredited special-process capacity is a finite, shared resource across the entire St. Louis aerospace cluster, while machining capacity is comparatively abundant. The region has a deep bench of AS9100 machine shops, so spindle time is usually findable, but accredited heat-treat, nondestructive-testing, and coating operations serve the whole base. When Boeing programs ramp, those queues lengthen for everyone at once. A titanium or steel part might machine in days, then wait a week or more for an accredited heat treater or NDT house to process it, which makes the special process, not the cutting, the real critical path. To manage this, treat special processes as primary from your first quote: ask processors directly about current queue times for your specific operation, sequence routing realistically instead of assuming instant turnaround, keep machining and accredited processing both local so parts don't lose days in freight between operations, and consider qualifying a backup processor for high-volume processes. Buyers who plan around the special-process queue hold their schedules; those who treat it as an afterthought get surprised.
They're three distinct layers that typically travel together on St. Louis flight hardware, and a buyer needs all the ones that apply. AS9100 governs the overall aerospace quality management system at the company level, it certifies that a shop runs a conforming quality system, but it does not accredit special processes. NADCAP fills that gap by independently accrediting specific controlled operations like heat treat, NDT, and coatings against industry-consensus criteria, which aerospace primes require because a quality system alone doesn't prove a furnace cycle or an inspection method meets spec. ITAR is separate again: it's a legal compliance status with the State Department covering defense-controlled technical data and hardware, unrelated to quality or process capability. On a typical St. Louis defense part, you might need AS9100 for the machining supplier's quality system, NADCAP for each special process in the routing, and ITAR registration and controls because the data is defense-controlled. The discipline is to map your part's full routing and confirm the right layer is present at each operation and subcontractor, not to assume one credential covers the others.
Last updated: July 2026
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