Guides / Choosing a Supplier

First Article Inspection for Inconel Parts: What to Expect

September 3, 2026

A first article inspection (FAI) is the proof that a part matches its drawing before a full order ships, not just a part with a checkmark on the box. On Inconel, where a small process drift shows up as an out-of-tolerance feature more easily than it would on aluminum or mild steel, a real FAI matters more than the paperwork suggests.

What a first article inspection report actually contains

A proper FAI report ties a dimensional result to every callout on the drawing, not a sample of the easy ones. That includes critical diameters, thread and bore tolerances, surface finish where specified and geometric tolerances like flatness or position. It is paired with the material certificate for the specific lot the part was cut from, and with a record of the process used to make it: the machine, the fixturing and the operations performed in order.

The point of tying every result to a specific drawing callout is traceability. If a feature is later found out of tolerance on a production part, the FAI record shows whether that feature was ever actually verified on the first piece, and what the process looked like when it was in tolerance.

A report worth relying on also names the equipment used to measure each feature, a coordinate measuring machine for position and profile, a hardness tester after aging, a surface finish gauge where called out, rather than just listing a pass or fail next to a dimension. That level of detail is what lets you or a downstream auditor reconstruct how a result was reached, not just what the result was.

Why the first piece off a new setup matters more on Inconel

Inconel work-hardens under the tool, so the cutting conditions on the first piece off a new setup are not necessarily the same as the fifth or the twentieth. Tool wear happens faster than it does on steel, and an insert that cuts cleanly on piece one can be pushing a slightly different result by piece five. A setup that looks dialed in on the first part can drift within a short run if speeds, feeds or tool changes were not planned around this.

That is why an FAI on Inconel is not just a formality carried over from other materials. It is the point where a shop confirms the setup actually holds tolerance under real cutting conditions on this specific alloy, not just that the program runs without crashing.

What to expect, without assuming certification

Buyers sometimes ask whether a shop’s FAI process follows the AS9102 format used across aerospace. Some shops do build their reports this way as a matter of internal practice, with a form tying each dimension to a drawing zone and a material and process record attached. That structure is a reasonable thing to ask for regardless of whether the part specifically requires it.

What you should not assume, and what we do not claim on your behalf, is that a shop holds a specific certification like AS9100 just because its FAI report looks thorough. If a certification is a hard requirement for your part, say so on the RFQ and confirm it directly with the matched shop before you commit, rather than inferring it from the quality of the paperwork.

How long a proper FAI typically adds to a first order

A real FAI adds time beyond the machining itself: measuring every callout, compiling the report and, in some cases, waiting on an outside lab for material verification. On a first Inconel order, plan for this to add several days to a couple of weeks on top of the machining and any heat treatment, depending on part complexity and how many features need to be verified. A shop quoting a first Inconel order with no allowance for this step at all is usually planning to skip it, not planning to do it fast.

Ask for the FAI timeline as part of the quote, not as a surprise once the part is already in process. A shop with a real process can tell you roughly how long it takes on a part like yours.

What to send with your RFQ to make FAI go smoothly

State on the RFQ whether an FAI report is required and, if you have a preferred format or a customer flow-down requirement behind it, say so up front. Naming the features that matter most, not just pointing at the drawing as a whole, also helps: a shop that knows which two or three dimensions are load-bearing or fit-critical can plan its measurement and reporting around them instead of treating every callout as equally urgent. None of this changes what a real FAI costs in time, but it does keep that time from being spent on the wrong details.

Frequently asked questions

Keep reading

• How to Qualify a Machine Shop for Inconel Work
• Writing an RFQ for Inconel Parts That Gets a Fast, Accurate Quote