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NADCAP-Accredited Special Process Suppliers near Janesville, WI

Unlike a quality system certification that covers a whole company, NADCAP accredits specific special processes — and that single fact reshapes how you source it. A Janesville heat treater might be NADCAP-accredited for heat treating but not for the brazing it also performs, so buyers sourcing aerospace and defense work in southern Wisconsin have to think at the process level, audit cycle by audit cycle, rather than at the company level.

NADCAPAS9100ISO 9001
NADCAP — the National Aerospace and Defense Contractors Accreditation Program — accredits individual special processes against industry consensus checklists administered by the Performance Review Institute. A supplier doesn't 'have NADCAP'; it holds accreditation for specific processes: heat treating, nondestructive testing, chemical processing, coatings, welding, materials testing, and more. Each is audited and accredited separately, and each carries its own scope and expiration. This is the central thing buyers get wrong. A Janesville shop accredited for heat treating to AMS specifications is not thereby accredited for the fluorescent penetrant inspection it might also run. You must confirm accreditation for the exact process — and often the exact specification and method — your part requires. The accreditation scope letter or the PRI eAuditNet listing spells out precisely what's covered. For southern Wisconsin, the relevant suppliers are typically the region's commercial heat treaters, platers, weld shops, and NDT houses that built capacity for automotive and heavy-equipment volumes and then sought NADCAP to qualify for aerospace and defense flow-down requirements. They're process specialists, and you source them as the special-process tier within a larger machining or fabrication supply chain.

Verifying Accreditation Through eAuditNet and Prime Approvals

NADCAP accreditations are verifiable in PRI's eAuditNet system, which lists accredited suppliers, their accredited processes, and accreditation status. Ask the Janesville supplier for the exact processes and specifications they're accredited to, then confirm them against eAuditNet rather than a marketing summary. Accreditation merit status (the interval before the next audit) also tells you something about audit performance — longer merit indicates a cleaner audit history. Beyond NADCAP itself, many aerospace primes maintain their own approved supplier lists and require both NADCAP accreditation and prime-specific approval for a given process. If your end customer is a particular OEM, confirm the supplier holds not just generic NADCAP heat-treat accreditation but the customer's approval for that process where required. This dual gate catches buyers who assume NADCAP alone satisfies every flow-down. Watch the audit cycle closely. NADCAP accreditations are time-bound and re-audited on a defined interval; a supplier in a lapse or with a process that fell out of accreditation can quietly leave a gap in your traceability. Build a requirement into your purchase order that the supplier notify you of any change in accreditation status for the processes you depend on.

How NADCAP Fits the Janesville Aerospace Supply Chain

In practice, a buyer rarely sources a NADCAP supplier in isolation. The typical pattern is a machining or fabrication prime — possibly AS9100 certified — that outsources special processes to NADCAP-accredited sub-tiers. In the Janesville area that means the local heat treater, plater, weld shop, or NDT lab becomes a node in your supply chain whether you contract them directly or through the prime. Either way, you need their accreditations on file. This is where AS9100 and NADCAP interlock. AS9100 governs the prime's overall quality system and requires it to control its special-process suppliers; NADCAP provides the accreditation that satisfies that control for each process. A strong AS9100 prime in southern Wisconsin will already manage an approved list of NADCAP sub-tiers and produce their accreditations on demand. A weaker one will outsource special processes loosely, which is exactly where aerospace quality escapes originate. For defense work, layer ITAR on top: if the special process touches controlled hardware or technical data, the NADCAP heat treater or NDT lab must also be ITAR-compliant. The cleanest Janesville-area special-process suppliers serving defense will hold NADCAP for their processes, maintain ITAR registration where controlled work demands it, and operate under an AS9100 or ISO 9001 quality system underneath.

Frequently Asked Questions

Only specific processes, and this is the most important thing to understand about NADCAP. The accreditation is granted process by process against detailed industry consensus checklists administered by the Performance Review Institute. A supplier earns accreditation for, say, heat treating to specific AMS specifications, or for fluorescent penetrant inspection, or for a particular welding process — each independently audited with its own scope and expiration. A Janesville heat treater accredited for heat treating is not automatically accredited for any brazing, coating, or NDT it might also perform. As a buyer you must verify accreditation for the exact process, and often the exact specification and method, that your part requires. Pull the supplier's accreditation scope and confirm it in PRI's eAuditNet system rather than trusting a general claim of 'NADCAP accredited.' If your part needs both heat treat and penetrant inspection, the supplier must hold accreditation for both, or those steps must be routed to separately accredited sources. Thinking at the company level instead of the process level is the most common way buyers end up with an unaccredited special-process step in an aerospace part.
Use eAuditNet, the Performance Review Institute's system that lists NADCAP-accredited suppliers along with their accredited processes and current status. Ask the Janesville supplier for the precise processes and specifications they claim accreditation to, then confirm each one in eAuditNet rather than accepting a marketing summary or a single certificate image. Pay attention to accreditation status and the merit interval — the time before the next required audit — since a longer merit period reflects a stronger audit history, while a supplier approaching or past an audit deadline may have a gap. Then go one layer further: many aerospace primes maintain their own approved supplier lists and require both NADCAP accreditation and the prime's specific approval for a process. If your end customer is a particular OEM, confirm the supplier holds that customer's approval where required, not just generic NADCAP accreditation. Finally, because accreditations are time-bound and re-audited on a defined cycle, build a clause into your purchase order requiring the supplier to notify you immediately of any change in accreditation status for the processes you depend on, so a lapse doesn't silently break your traceability chain.
Southern Wisconsin's special-process suppliers — heat treaters, platers, weld shops, and NDT labs — largely built their capacity around automotive and heavy-equipment volumes. NADCAP accreditation lets them unlock aerospace and defense work, where primes flow down mandatory special-process accreditation requirements that automotive customers never imposed. For these shops, NADCAP is a market-expansion move: their existing process competence is real, and accreditation is what makes it usable for flight and defense hardware. For a buyer, that history is both reassuring and cautionary. Reassuring because the underlying process capability is often mature and high-volume; cautionary because a shop newer to aerospace may be early in adapting its documentation, frozen-process controls, and pyrometry or NDT rigor to the stricter NADCAP checklists. The right move is to weight evidence of clean recent audits and longer merit status over the simple fact of accreditation. A Janesville heat treater with a strong NADCAP audit history and AMS pyrometry compliance is exactly the kind of process specialist that anchors a regional aerospace supply chain, while one that just squeaked through its first audit deserves closer source surveillance.
They cover different things and frequently stack together. AS9100 certifies a manufacturer's overall aerospace quality management system and requires it to control its special-process suppliers; NADCAP provides the process-specific accreditation that satisfies that control for each outsourced special process. So a typical arrangement near Janesville is an AS9100-certified machining prime that routes heat treat, plating, or NDT to NADCAP-accredited sub-tiers and manages them on an approved supplier list. NADCAP doesn't replace AS9100 and AS9100 doesn't replace NADCAP — the prime needs the quality system, the special-process suppliers need the accreditations. ITAR adds a third, independent layer for defense work: if the special process touches U.S. Munitions List hardware or controlled technical data, the NADCAP-accredited heat treater or NDT lab must also be ITAR registered and operationally compliant with export controls. The cleanest defense-capable special-process suppliers in the Janesville area therefore tend to hold NADCAP for their processes, maintain ITAR registration where controlled work requires it, and run under an AS9100 or ISO 9001 quality system. Verify all applicable layers independently, because each answers a different question and a gap in any one creates real program risk.

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Last updated: July 2026

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