Aerospace CNC Machining in Canada (2026): AS9100, Titanium & the Montreal Cluster

A shop cuts a titanium fitting dead-on the print, holds every tolerance, hands it over, and the part still cannot fly. No material cert tying the bar stock to a known heat. No first article inspection report. No traceability back to the lot. In aerospace, a perfect part with no paperwork is scrap. That is the thing buyers new to the sector underestimate: the part is half the job. The other half is proof. This guide covers both halves, the certifications, materials, tolerances, and traceability that flight-grade work demands, and why Canada, and the Montreal cluster in particular, is a credible place to source it.

TL;DR

Aerospace CNC machining is defined by proof as much as by metal removal. To qualify a supplier you are checking four things: a quality system (AS9100, which is ISO 9001 plus aerospace-specific risk, traceability, and counterfeit-part controls), material traceability and certs, first article inspection to AS9102, and the ability to hold tight tolerances on hard alloys like Ti-6Al-4V and Inconel, verified on a CMM. Canada is a strong place to source all of it. The aerospace sector contributed $34.2 billion to GDP and 225,000 jobs in 2024, anchored by Montreal, the world's third-largest aerospace centre. Tell us what you need and we route it to a vetted shop with the right certs and machines.

Why Aerospace Machining Is a Different Discipline

In general CNC, the deliverable is a conforming part. In aerospace, the deliverable is a conforming part plus a documented chain of evidence that it conforms, and that the material, processes, and inspection behind it are all controlled and traceable. The machining is necessary. It is not sufficient.

That changes how you buy. A general buyer compares shops on price, lead time, and whether they can hold the tolerance. An aerospace buyer compares shops on all of that plus quality system, material control, special-process accreditation, and inspection capability, because a part that cannot be documented cannot be installed. The certifications and the paper trail are not bureaucratic overhead bolted onto the job. They are the product.

So the rest of this guide is organized the way a procurement engineer actually qualifies an aerospace supplier: what the standards mean, which materials drive cost and risk, how tolerances get verified, what traceability requires, when geometry forces 5-axis, and where in Canada the capability lives.

AS9100 vs ISO 9001: What the Aerospace Standard Adds

Start with the quality system, because it gates everything else. The plain-English version: ISO 9001 is the general quality management standard used across every industry. AS9100 is the aerospace version, and it contains all of ISO 9001 then adds aerospace-specific requirements on top.

AS9100 was developed by the aerospace division of SAE International together with the International Aerospace Quality Group, and it builds on ISO 9001 while adding requirements for risk management, configuration control, traceability, supplier control, product safety, and counterfeit-part prevention. Those additions map directly onto what flight hardware needs. Configuration control means the shop knows exactly which revision of the drawing it built. Counterfeit-part prevention means the material is what the cert says it is. Traceability means any part can be tied back to its lot.

	ISO 9001	AS9100
Scope	General quality management, any industry	Aerospace, defence, and space
Built on	The standalone baseline	All of ISO 9001, plus aerospace clauses
Risk management	General	Formal, product-safety focused
Configuration control	Not specifically required	Required
Traceability	Encouraged	Required and audited
Counterfeit-part prevention	Not addressed	Required
Typical buyer	General industrial	Flight hardware and OEM supply chains

The takeaway for sourcing: if your part is flight hardware or feeds a tier-one or OEM flow-down, you almost certainly need an AS9100 shop. If it is ground-support equipment, tooling, or a non-flight prototype, a strong ISO 9001 shop with material certs is often enough. Read your own contract flow-downs before you decide, because they set the requirement, not the shop.

Beyond AS9100: Nadcap Special-Process Accreditation

AS9100 covers the shop's overall quality system. It does not, by itself, prove that a specific special process, the heat treat, the anodize, the weld, the non-destructive test, was performed under aerospace-controlled conditions. That is what Nadcap does.

Nadcap is administered by the Performance Review Institute and provides 26 critical-process accreditations covering special processes such as heat treating, non-destructive testing, chemical processing, coatings, welding, and conventional and non-conventional machining. A special process is one whose result you cannot fully verify by inspecting the finished part. You cannot see whether a heat treat hit the right metallurgy by looking at the part, so the process itself has to be audited and accredited.

For a buyer, the rule is simple. AS9100 qualifies the machine shop. Nadcap qualifies the special processes that machine shop sends out or performs. If your part needs heat treatment, a controlled coating, welding, or NDT, and your customer flows down Nadcap, then the supplier performing that step needs Nadcap accreditation for it. Many machine shops hold AS9100 and partner with Nadcap-accredited processors for the steps they do not run in-house. That is normal and acceptable, as long as the accreditation follows the process.

Aerospace Materials and Why They Fight Back

Four material families carry most aerospace machining, and each one trades cost, weight, and machinability differently. Knowing them tells you why an aerospace quote looks the way it does.

Titanium, mainly Ti-6Al-4V (Grade 5). This is the most commercially successful titanium alloy, with a density of about 4.43 g/cm³, well under half the weight of steel, which is exactly the strength-to-weight trade airframes and engines want. It is also slow and expensive to machine. Titanium conducts heat poorly, so cutting heat concentrates at the tool edge instead of leaving in the chip, which wears tools fast and forces conservative speeds, heavy coolant, and rigid fixturing. The stock costs more and cuts slower, so the labor per part climbs too. See titanium machining capability.

High-strength aluminum, 7075 and 2024. The volume workhorse of airframe structure. It machines fast, finishes well, and is light, which is why most of an aircraft's structural parts are aluminum. The catch is that aerospace aluminum grades are tempered and sometimes prone to residual-stress distortion in thin sections, so fixturing and stress relief matter.

Nickel superalloys, like Inconel. Reserved for hot-section turbine parts and anywhere temperature would soften aluminum or titanium. Inconel keeps its strength at high heat, which is also what makes it brutal to cut: it work-hardens under the tool and chews through cutting edges. It is the slowest and most demanding of the four, and you specify it only when heat leaves no choice.

Aerospace stainless and steels. Used for fittings, fasteners, landing-gear components, and parts needing wear or corrosion resistance where weight is less critical.

The practical signal: a quote that looks expensive on titanium or Inconel is usually not a shop gouging you. It is the metal and the cutting physics. The way to control cost is to specify the lightest material the part can structurally accept, and to tolerance only the features that need it.

Tolerances and Inspection: CMM, First Article, and GD&T

Aerospace tolerances are tight, but the headline is not the number. It is the verification. A general machine shop can hit a few thousandths of an inch. An aerospace shop hits it and proves it on a coordinate measuring machine, then documents it.

General machined features usually follow a standard like ISO 2768, while critical callouts run far tighter, often to a few thousandths of an inch or finer, with form, profile, position, and runout controlled by GD&T (geometric dimensioning and tolerancing) rather than plus-or-minus box dimensions alone. GD&T is the language that tells the shop which relationships are functional and which datums everything references from.

The formal verification step is first article inspection. AS9102 is the North American aerospace standard for first article inspection requirements, and an FAI report is documented on Form 1 for part-number accountability, Form 2 for product accountability including material and special-process certifications, and Form 3 for characteristic accountability, the dimensional results. An FAI is a full, documented check of the first production part against every drawing requirement, not a spot check. You require it on the first run of a new part, after a design or process change, or after a long gap in production.

So when you read an aerospace quote, the CMM time and the FAI documentation are real line items, not padding. They are what converts a good part into an accepted part.

Traceability and Material Certs: The Paper Trail

This is the half of the job that trips up buyers coming from general machining. A flight-eligible part needs an unbroken trail from the certified mill heat, through the shop, to the finished piece.

It works like this. The metal arrives with a mill test report tying that specific lot to its chemistry and mechanical properties. The shop records which lot went into which part, controls the revision it built to, and tracks every special process. At delivery, the certs travel with the parts. If a defect or a fleet-wide concern ever surfaces, the part can be tied back to a known, conforming batch, and anything from a suspect lot can be found and pulled.

Skip any link and the part is not flight-eligible, no matter how perfectly it was cut. That is why "we can hold the tolerance" is necessary but not sufficient, and why an aerospace supplier audit spends as much time on material control and records as on the machines. When you qualify a shop, ask to see a sample cert package and an FAI report. A shop that does aerospace work routinely will have them ready. A shop that does not will hesitate, and that hesitation is your answer.

When You Actually Need 5-Axis

Multi-axis capability is associated with aerospace, but the decision is geometric, not industrial. You reach for 5-axis when one of three things is true:

• The part has a continuously curved, sculpted surface, like a turbine or impeller blade, that the tool must follow as the surface bends away. Only simultaneous 5-axis holds that.
• The part needs deep reach or tool access that a short, rigid tool can only get by tilting, instead of a long, chatter-prone tool.
• The part has critical features on many faces that must hold position to each other, and cutting them in one or two setups removes the datum shift that creeps in with every re-fixturing.

If none of those apply, a prismatic bracket or plate with features on one or two faces runs faster and cheaper in 3-axis. Many aerospace parts are exactly that. For the full decision framework, see our companion guide on when you need 5-axis CNC machining in Canada. The short version: pay for the axes the geometry needs, and send the model so the shop can route it to the cheapest process that meets the print. Most milled aerospace work still flows through standard CNC milling, with 5-axis reserved for the sculpted and multi-face parts.

Why Canada: A Top-Tier Aerospace Base

The capability aerospace machining demands clusters where the aerospace industry is, and in Canada that base is deep and OEM-grade, not a niche.

In 2024 the industry contributed $34.2 billion to GDP and accounted for 225,000 jobs, with the sector directly employing 92,500 workers, 57,700 in manufacturing and 34,800 in maintenance, repair and overhaul. It is also an innovation leader: Canadian aerospace manufacturing invested more than $1.2 billion in R&D in 2024 and held the number-one R&D ranking among all Canadian manufacturing industries.

It is export-built, which matters for a buyer judging quality bar. Canadian aerospace manufacturing exported nearly $26 billion to 166 countries in 2024, with more than 70% of revenues export-related, and the country ranked in the global top five across civil flight simulators at number one, engines at number three, and aircraft at number four. A supply base that ships flight hardware worldwide is held to the standards your part needs. Sourcing here also keeps your drawings and IP onshore and moves under tariff-free CUSMA terms, which is a concrete reason for aerospace buyers to choose domestic supply over overseas.

The Montreal Cluster: World No. 3

If you are sourcing aerospace machining in Canada, you are mostly sourcing in or near Greater Montreal, and for good reason. Montreal is the world's third-largest centre of aerospace manufacturing and the only area on earth where an entire aircraft can be assembled from locally manufactured components. That last fact is the one to hold onto. A supply base complete enough to build a whole aircraft locally is a supply base deep enough to make your part.

The Quebec numbers fill it in. The province's aerospace sector employed 43,100 people in 2024, with sales of nearly $22.8 billion and over 215 SMEs supporting the major prime contractors. Those 215-plus small and mid-size suppliers are the machine shops, fabricators, and special-process houses that an OEM ecosystem runs on, exactly the tier a procurement engineer sources from. The cluster is also where the engineering depth sits: more than 75% of Canadian aerospace R&D takes place in the Montreal region, and in metropolitan Montreal roughly 1 in 56 workers is employed in aerospace.

The OEM anchors are real and local. The Mirabel Aerospace Centre supports flight testing for Pratt & Whitney Canada engines, including turboprops and turbofans up to 90,000 pounds of thrust, and assembles and tests engines for the Bombardier CSeries, now the Airbus A220. The export concentration follows: Quebec accounts for 93.4% of Canada's aircraft exports, 76.4% of aircraft engine exports, and 35.7% of aircraft parts exports. For a buyer, that density means short supply chains, shops fluent in AS9100 and hard alloys, and accredited special processes within reach. Source it in Montreal.

Toronto, Winnipeg, and the Rest of the Footprint

Montreal leads, but it is not the only place to source. Ontario, anchored by the Toronto area, holds a large machining and aerospace-supply base and a deep general manufacturing workforce that aerospace shops draw on. Winnipeg is the western aerospace hub, with composites and component manufacturing. Capacity reaches into other metros as well, so for many parts you have more than one credible cluster to quote against.

The practical implication for sourcing: you are rarely captive to a single region. That lets you weigh location against capability, certs, and lead time instead of taking whatever one local shop offers, which is the whole point of sourcing across a network.

How to Qualify an Aerospace CNC Supplier: A Checklist

Run a candidate shop against this before you place the PO. The first three are gates. The rest are how you separate a real aerospace supplier from a general shop that takes the odd aerospace job.

1. Quality system. Is the shop AS9100 certified, and current? Ask for the certificate and the certifying body. If your part is flight hardware, this is non-negotiable.
2. Material traceability. Can they provide mill test reports and full lot traceability, and do they control the drawing revision they build to? Ask to see a sample cert package.
3. First article inspection. Can they produce a complete AS9102 FAI report (Forms 1, 2, and 3)? Ask for a redacted example.
4. Inspection capability. Do they have CMM capacity to verify your tolerances and GD&T, and is the equipment calibrated and documented?
5. Special processes. For any heat treat, coating, welding, or NDT your part needs, do they hold Nadcap accreditation or use accredited partners, with the accreditation following the process?
6. Material and machine fit. Do they have real experience in your alloy (Ti-6Al-4V, 7075, Inconel) and the machines your geometry needs, including 5-axis if the part is sculpted or multi-face?
7. Capacity and lead time. Can they hold your schedule at your quantity, including the FAI and documentation time, not just the cutting?

If a shop clears one through three without hesitation and answers four through seven with specifics, it is a genuine aerospace supplier. If it is vague on certs or traceability, that is the red flag, and no quality of finish makes up for it.

Common Mistakes Aerospace Buyers Make

Mistake 1: Treating certs as an afterthought. A part with no cert package is scrap, however well it was cut. Flow down AS9100, FAI, and traceability requirements in the RFQ, not after delivery.

Mistake 2: Over-specifying the material. Calling out titanium or Inconel where high-strength aluminum would carry the load adds cost and lead time for nothing. Specify the lightest material the part structurally accepts.

Mistake 3: Blanket-tight tolerancing. Holding every feature to a few thousandths forces slow cutting and heavy inspection on features that never needed it. Tolerance the functional features with GD&T and leave the rest at a general standard.

Mistake 4: Asking for 5-axis to signal quality. The axis count does not make the part better. Matching the process to the geometry does. Send the model and let the shop route it.

Mistake 5: Sending a drawing with no 3D model. A sculpted aerospace surface cannot be defined by a 2D drawing. Send a clean STEP file plus the drawing or model-based PMI for tolerances and datums.

How FrankWorks Handles Aerospace Work

The hard part of sourcing aerospace machining is not the cutting. It is finding the shop with the right certs, the right alloy experience, the right machines, and the inspection and traceability to make the part flight-eligible, then trusting it with a controlled drawing. FrankWorks does that matching across a vetted Canadian network. Describe the part or send the model with your quality flow-downs, AS9100, any Nadcap special processes, the FAI requirement, and we route it to a shop equipped for the work and come back with pricing and a lead time. If you have a clean STEP or IGES file ready, you can get an instant estimate and a manufacturability check first. Either way, you are sourcing from a base built to OEM standards, with the certs and paper trail the part actually needs.

Frequently Asked Questions

What is the difference between AS9100 and ISO 9001 for CNC machining? AS9100 is built on ISO 9001 and keeps all of its requirements, then adds aerospace-specific controls: formal risk management, configuration control, full traceability, supplier oversight, product safety, and counterfeit-part prevention. An ISO 9001 shop has a sound general quality system. An AS9100 shop has one designed for flight hardware and audited against it.

Do I always need an AS9100-certified shop for aerospace parts? Not always. If your part is flight hardware or feeds a tier-one or OEM supply chain, the customer flow-down usually requires AS9100. For ground-support equipment, tooling, prototypes, or non-flight brackets, a strong ISO 9001 shop with material certs is often enough. Read your own contract flow-downs first, because they set the floor.

What is Nadcap and when does my supplier need it? Nadcap is a special-process accreditation run by the Performance Review Institute, covering processes like heat treating, NDT, welding, chemical processing, and coatings. AS9100 covers the machine shop's overall quality system. Nadcap audits the individual special processes inside it. You need it when your part requires a controlled special process and your customer flows the requirement down.

What is a first article inspection (AS9102) and when is it required? A first article inspection is a full documented verification of the first production part against every drawing requirement, governed by AS9102. The report uses Form 1 for part identification, Form 2 for material and special-process certs, and Form 3 for dimensional results. It is required on the first run of a new part, after a design or process change, or after a long production gap.

Which materials are used most in aerospace CNC machining? The core four are titanium (mainly Ti-6Al-4V), high-strength aluminum (7075 and 2024), nickel superalloys like Inconel for hot sections, and aerospace stainless and steels. Aluminum dominates by volume for airframe structure because it machines fast and light. Titanium and Inconel show up where strength, heat, or weight rule out aluminum.

Why is titanium 6Al-4V so hard (and expensive) to machine? Ti-6Al-4V is strong, springy, and a poor heat conductor, so cutting heat stays at the tool edge instead of leaving in the chip. That wears tools fast and forces slow speeds, heavy coolant, and rigid setups. The metal itself is costly, and slow cutting plus short tool life raises the labor per part. It is roughly 40% lighter than steel at comparable strength, which is why aerospace pays the premium.

What tolerances can aerospace CNC machining hold, and how are they verified? General machined features follow a standard like ISO 2768, while critical aerospace callouts commonly run to a few thousandths of an inch or tighter, with profile and position controlled by GD&T. Verification is by CMM and documented in a first article inspection report, with material and process certs attached. The print and the FAI, not the cut, are what make the part acceptable.

What is material traceability and why do aerospace buyers need material certs? Traceability is the unbroken paper trail from the certified mill heat or lot, through the shop, to the finished part. The mill test report ties the raw stock to its chemistry and mechanical properties. Aerospace buyers need it so a part can be tied back to a known, conforming batch if a defect or recall ever surfaces. Without certs, a part is not flight-eligible regardless of how well it was cut.

When do I actually need 5-axis machining versus 3-axis? You need 5-axis when a part has continuously curved surfaces like turbine or impeller blades, deep reach that a short tool can only make at an angle, or critical features across many faces that must hold position in one or two setups. Prismatic brackets and plates with features on one or two faces run faster and cheaper in 3-axis. The geometry decides, not the industry.

Why source aerospace CNC machining in Canada instead of the US or overseas? Canada has an OEM-grade aerospace supply base. The sector contributed $34.2 billion to GDP in 2024 and exported to 166 countries, anchored by Montreal, the world's third-largest aerospace centre. Sourcing here gives you tariff-free CUSMA access, IP and drawings that stay onshore, full traceability, and shops already fluent in AS9100 and hard alloys, without the freight and oversight cost of overseas supply.

Where are Canada's aerospace machining shops concentrated? Greater Montreal is the centre of gravity, holding more than 75% of national aerospace R&D and the only place on earth where a whole aircraft can be built from locally made components. Toronto anchors a large Ontario base, Winnipeg is a western hub, and capacity reaches across the country. For most aerospace work you are sourcing in or near the Montreal and Toronto clusters.

What should I send to get an accurate aerospace machining quote? Send a STEP file (AP242 if your CAD supports it) plus a 2D drawing or model-based PMI carrying tolerances, datums, GD&T, finishes, and material spec. Add your quality flow-downs: AS9100, any Nadcap special processes, FAI requirement, and cert needs. The more of the print and the requirements you send up front, the faster and tighter the quote comes back.