✈️ AS9100
AS9100 Rev D Aerospace Suppliers in Fond du Lac, WI
Aerospace buyers don't get to gamble on a supplier's quality system, which is exactly why AS9100 Rev D exists and why it's harder to earn than a standard ISO certificate. Around Fond du Lac, the shops that hold AS9100 usually built it on years of tight-tolerance commercial machining for marine and heavy-equipment customers, then absorbed the aerospace requirements for counterfeit-part prevention, configuration management, and first-article rigor. Here's what a procurement team should understand before sourcing aerospace work in this corner of Wisconsin.
AS9100ISO 9001NADCAP
1
How a Marine-and-Equipment Town Grows Aerospace Capability
Fond du Lac is not an aerospace town in the way Wichita or Hartford are, but it has something aerospace buyers value: a concentration of shops that already machine to tight tolerances in difficult materials. Decades of feeding Mercury Marine's propulsion programs and Fox Valley heavy-equipment OEMs built a workforce fluent in multi-axis machining, fixturing, and inspection. That commercial precision foundation is the natural launch point for AS9100 certification.
The shops here that pursue AS9100 typically do so to diversify beyond cyclical marine and equipment demand into the steadier, higher-margin aerospace and defense market. What they're adding on top of their commercial base is the aerospace-specific layer: configuration and change management, rigorous first-article inspection per AS9102, foreign object debris control, and the counterfeit-parts and special-process controls that AS9100 Rev D demands.
For a buyer, this background is actually reassuring. A Fond du Lac AS9100 shop usually isn't a startup chasing a certificate; it's an established machining operation that earned its commercial reputation first and then formalized the aerospace discipline. That depth of metalworking experience often shows up in better fixturing, smarter process planning, and lower scrap on complex parts.
2
Reading an AS9100 Certificate the Way a Quality Engineer Would
AS9100 certificates are registered in the OASIS database (Online Aerospace Supplier Information System) maintained under the IAQG. This is the single most useful verification tool a buyer has: you can confirm a supplier's certificate, its scope, its certification body, and its current status independently rather than relying on a PDF the shop emailed you. Always check OASIS before shortlisting.
Scrutinize the scope statement carefully. AS9100 covers design, production, or both, and a certificate scoped to 'machining of aerospace components' tells you something different than one that includes 'assembly' or 'design.' Match the scope to the actual work you're buying. Also confirm the certificate references AS9100 Rev D specifically, since this is the current revision and aligns the standard with ISO 9001:2015's structure plus aerospace additions.
Watch for special processes. AS9100 itself does not certify processes like heat treating, anodizing, or non-destructive testing; those require NADCAP accreditation, often flowed down from the prime. A shop might be AS9100 certified but subcontract its special processes to NADCAP-accredited vendors. Confirm where those processes happen and that the accreditations exist, because a gap there will surface during a prime's source inspection.
3
Lead Time, Cost, and the Realities of Aerospace Sourcing in Wisconsin
AS9100 work costs more and takes longer than commercial machining, and buyers who don't budget for that get surprised. The documentation burden alone, full traceability, AS9102 first articles, and configuration control, adds engineering hours to every part. Expect aerospace lead times to run weeks longer than the equivalent commercial part, particularly when special processes route out to NADCAP vendors and add a leg of logistics and queue time.
Sourcing in the Fond du Lac and Fox Valley region offers a real freight and oversight advantage for buyers based in the upper Midwest or with operations in Wisconsin, Minnesota, or Illinois. Site visits and source inspections are a short drive, and regional LTL keeps inbound freight predictable. Against a coastal aerospace cluster, you may trade a smaller supplier roster for lower logistics cost and easier access to the floor.
The honest tradeoff is breadth. The largest, most specialized aerospace machining capacity still concentrates in established aerospace regions. For a buyer with complex five-axis titanium work or large structural components, a national search may be necessary. For precision aluminum and steel aerospace components within the capabilities of a strong Midwest machine shop, a Fond du Lac AS9100 supplier can be highly competitive on total cost.
4
Pairing AS9100 With the Adjacent Certs Your Program Will Demand
AS9100 rarely stands alone on an aerospace program. The most common companion is NADCAP accreditation for special processes, and primes routinely flow down NADCAP requirements for heat treatment, chemical processing, coatings, welding, and non-destructive testing. When you source an AS9100 machine shop, immediately map which special processes your parts require and confirm whether the shop holds the relevant NADCAP accreditations in-house or uses an accredited subcontractor.
If your aerospace work touches defense, ITAR registration becomes critical the moment the parts fall under USML control. An AS9100 shop handling controlled technical data must be ITAR registered with DDTC and have export-compliance controls in place. Ask the question early, because a quality-perfect shop that can't legally receive your defense drawings is useless to a defense program.
For a procurement team, the practical move is to treat AS9100 as the anchor cert and then layer the program's specific flow-downs onto your supplier requirements. Use ManufacturingBase to filter for AS9100 plus NADCAP plus ITAR together when your program demands the full stack, rather than discovering a gap after the kickoff meeting.
Frequently Asked Questions
Yes, though they're a smaller and more specialized group than the general ISO 9001 machine-shop population. Fond du Lac and the surrounding Fox Valley have a deep precision-machining base built around marine propulsion and heavy equipment, and a subset of those shops pursued AS9100 to diversify into aerospace and defense. The most reliable way to find them is to search the OASIS database for aerospace-certified suppliers in the region, or to use ManufacturingBase to filter by AS9100 plus the specific capability and material your parts require. Don't assume a shop is aerospace-capable just because it does excellent commercial machining; aerospace adds documentation and process controls that not every shop chooses to formalize. When you do find a regional AS9100 supplier, the upside is often a mature metalworking operation with real depth in tight-tolerance work, since these shops typically earned a strong commercial reputation before adding the aerospace certification on top.
AS9100 Rev D is built on the full ISO 9001:2015 quality management standard and then adds roughly 100 additional requirements specific to aviation, space, and defense. The aerospace additions cover things ISO 9001 doesn't address in depth: configuration management, first-article inspection per AS9102, counterfeit-parts prevention, foreign object debris (FOD) control, product safety, risk management on critical items, and tighter control of special processes. An aerospace prime or Tier 1 will almost always require AS9100 rather than accepting ISO 9001 alone, because the aerospace requirements directly address the failure modes that matter in flight-critical hardware. For a buyer, the practical implication is that AS9100 is not optional for true aerospace production work; it's the entry ticket. A shop with only ISO 9001 might machine a prototype or a non-flight fixture, but it generally cannot supply flight hardware into a compliant aerospace supply chain. Always confirm the certificate is AS9100 Rev D and that its scope covers your specific work.
It depends on whether your parts require special processes. AS9100 certifies the overall quality management system, but it does not certify specific special processes such as heat treating, chemical processing, anodizing, plating, welding, or non-destructive testing. Those processes are accredited separately under NADCAP, the Nadcap special-process accreditation program managed by PRI. Aerospace primes routinely flow down NADCAP requirements, meaning your AS9100 supplier must either hold the relevant NADCAP accreditations in-house or route those operations to a NADCAP-accredited subcontractor. When sourcing in the Fond du Lac area, map your part's full process routing early: identify every special process it requires, then confirm where each one happens and that the accreditation is current. A common and entirely acceptable arrangement is an AS9100 machine shop that subcontracts heat treat and coatings to dedicated NADCAP-accredited vendors. The failure case to avoid is discovering during a prime's source inspection that a special process was performed by a non-accredited supplier, which can disqualify the entire lot.
The authoritative source is the OASIS database, the Online Aerospace Supplier Information System maintained under the International Aerospace Quality Group. Every legitimate AS9100 certificate issued by an accredited certification body is registered there, and you can look up a supplier to confirm the certificate exists, see its exact scope, identify the certification body, and verify it's active rather than suspended or expired. Always do this independently rather than trusting a PDF the supplier sends, because certificates get out of date and scopes are easy to misrepresent. Beyond OASIS, request the certificate directly and check that it references AS9100 Rev D, that the scope language matches the work you're buying, and that the dates show a current cycle with recent surveillance. During a site visit, a genuinely AS9100-mature shop can produce its quality manual, show configuration management records, walk you through a completed AS9102 first-article report, and demonstrate FOD controls on the floor. If those fundamentals aren't visible and practiced, treat the certificate skeptically regardless of what the paper says.
Last updated: July 2026
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