Aluminum CNC Machining in Canada: Grades, Costs, and Sourcing (2026)

Aluminum is the material most CNC parts are made from, and usually for the right reasons: it is light, it machines fast, it resists corrosion, and it takes a finish beautifully. But "aluminum" is not one thing. Pick 7075 when 6061 would have done, and you have paid aerospace prices for a bracket. Pick 5052 for a part with fine machined detail, and you fight a gummy finish. This guide covers the grades that matter, what actually drives the cost, how to finish the part, and why Canada is a strong place to make it.

TL;DR

For most CNC parts, the right aluminum is 6061-T6: it balances strength, corrosion resistance, and machinability, anodizes cleanly, and is everywhere, so it quotes fast and cheap. Step up to 7075 only when the part is strength-critical, and to 5052 when corrosion resistance or forming matters more than a crisp machined finish. Aluminum is also cheaper to machine than steel because it cuts faster, which lowers the biggest cost on a CNC part: machining time. And Canada is an excellent place to source it, as the world's fourth-largest primary aluminum producer, most of it low-carbon hydro aluminum from Quebec. Tell us what you need and we match your part to the right shop.

Why Aluminum Is the Default CNC Material

Before the grade choice, it helps to know why aluminum wins so often. Four reasons:

• It is light. Aluminum is roughly a third the density of steel, which matters anywhere weight is a cost or a constraint.
• It machines fast. Aluminum cuts at high speeds and is gentle on tooling. Since machining time is the biggest line item on most CNC parts, fast cutting means lower cost, often enough to offset aluminum's higher price per kilogram versus mild steel.
• It resists corrosion. A natural oxide layer protects it, and anodizing makes that protection much stronger.
• It finishes well. Aluminum bead-blasts and anodizes into clean, durable, colorable surfaces.

That combination is why, when an application allows it, a shop will often steer you toward aluminum.

The Grades That Matter

Most CNC aluminum work lives in four alloys. Match the grade to the job rather than defaulting to the strongest one on the shelf.

Grade	Strength	Corrosion resistance	Machinability	Weldability	Best for
6061-T6	High (the all-rounder)	Good	Excellent	Good	General structural parts, brackets, housings, the default
7075-T6	Highest (about 2x 6061)	Fair (often coated)	Good	Poor	Aerospace and high-stress structural parts
5052-H32	Moderate	Excellent (marine)	Fair (tends to gum)	Good	Formed and sheet parts, enclosures, marine
2024-T3	High, excellent fatigue	Fair (often clad)	Good	Poor	Aerospace skins and fatigue-critical parts

Grades and tempers follow the Aluminum Association designation system, and stock is supplied to standards like ASTM B221 (extrusions) and ASTM B209 (sheet and plate). You do not need to memorize them; you do need to state the grade and temper on your order.

Rules of thumb:

• Default to 6061-T6. It is right for the large majority of machined parts.
• Choose 7075 only when the part is genuinely strength-critical and the budget supports the premium. It is not "better 6061"; it is a different tradeoff.
• Choose 5052 when corrosion resistance or forming matters more than a fine machined finish.
• Choose 2024 for fatigue-critical aerospace work.

What Drives the Cost of an Aluminum Part

A quote is mostly four things, and grade is only one of them:

1. Machining time. The dominant cost. Complex geometry, tight tolerances, and many setups all add time. Aluminum helps here by cutting fast.
2. Material. 7075 and 2024 cost more than 6061; 5052 is comparable to 6061. The grade premium is real but usually smaller than the machining-time differences.
3. Finishing. Anodizing, especially hardcoat or tight color control, is a separate operation with its own cost and lead time.
4. Quantity. Setup cost is fixed per batch, so one-offs carry the full setup while a production run spreads it thin.

If your quote looks high, the lever is usually geometry and finishing, not the alloy. For more on what a complete quote should include, see all-in CNC pricing.

Finishing and Anodizing

Aluminum's finish options are part of why it is so popular. The common choices:

• As-machined. The raw cut surface. Cheapest, with visible tool marks.
• Bead blast. A uniform matte texture that hides tool marks. A clean, common default.
• Type II anodize. Standard anodizing for corrosion protection and color, in a thin layer. The usual choice for a finished, colored part.
• Type III hardcoat anodize. A much thicker, harder layer for wear resistance on functional surfaces.

One caution: 6061 anodizes cleanly and predictably, while 7075 and 2024 anodize less uniformly because of their alloying elements. If color consistency across a batch matters, say so up front and expect the shop to control the lot.

Designing Aluminum Parts for CNC: A Quick Checklist

1. Pick the grade and temper deliberately, and put them on the drawing.
2. Tolerance only the features that are functional; default the rest to a general standard.
3. Add fillets to internal corners sized to a standard cutter radius, so the shop is not chasing sharp internal corners a round tool cannot make.
4. Keep walls reasonable; very thin aluminum walls chatter and distort.
5. Call out the finish (bead blast, Type II, Type III) and any color.
6. Send a clean STEP file plus a drawing so the quote is built on complete information.

Common Mistakes Buyers Make

Mistake 1: Specifying 7075 by reflex. It is stronger, but it costs more, machines a little harder, corrodes more readily, and anodizes less cleanly. Use it when you need it, not as a quality signal.

Mistake 2: Expecting a fine machined finish on 5052. Its softness gums up cutters. For crisp machined detail, 6061 is the better choice.

Mistake 3: Ignoring anodize color consistency. Color can drift between lots and grades. If appearance matters, specify it and keep the work in one batch.

Mistake 4: Leaving the grade and temper off the drawing. "Aluminum" is not a spec. The shop needs the grade and temper to quote and machine correctly.

Why Source Aluminum in Canada

For a Canadian buyer, machining aluminum at home is a genuine advantage, not a compromise.

Canada is the world's fourth-largest primary aluminum producer, with about 3.3 million tonnes in 2024, and roughly 90% of it comes from Quebec, smelted with hydroelectricity into some of the lowest-carbon aluminum on earth. That sits on top of a $931.2 billion manufacturing sector with deep machining capacity. Sourcing here means short freight, no customs delays, no cross-border tariff exposure, faster revisions, and IP that never leaves the country. Compare local capacity in Montreal, Toronto, and Vancouver, or browse the full aluminum and CNC milling capabilities. New to choosing a shop? Start with how to choose a CNC machine shop.

How FrankWorks Handles Aluminum Work

The hard part of aluminum is not the machining; it is the upfront choices, grade, finish, tolerances, and finding a shop that runs that work every day. FrankWorks routes your part across a vetted Canadian network to a shop set up for it, and returns pricing and a lead time. Describe the part or send a file and the quote reflects the right grade and finish, not a guess.

Frequently Asked Questions

Which aluminum grade is best for CNC machining? For most parts, 6061-T6. It balances strength, corrosion resistance, machinability, and weldability, anodizes cleanly, and is widely stocked. Reach past it only when you need 7075's strength or 5052's corrosion resistance and formability.

What is the difference between 6061 and 7075 aluminum? 6061 is the versatile all-rounder. 7075 is aerospace-grade with roughly double the tensile strength, but it costs more, resists corrosion less well, and welds poorly. Use 6061 by default; choose 7075 when the part is strength-critical.

Is aluminum cheaper to machine than steel? Usually yes. Aluminum cuts at higher speeds and is easy on tools, so machining time drops. The raw material can cost more per kilogram than mild steel, but faster cycles often make the finished part cheaper.

Can all aluminum grades be anodized? Most can, but not equally. 6061 anodizes cleanly; 7075 and 2024 less uniformly; 5052 anodizes well. If color consistency matters, tell the shop up front.

What is the difference between Type II and Type III anodizing? Type II is standard anodizing for corrosion and color in a thin layer. Type III (hardcoat) is a much thicker, harder layer for wear resistance. Type II is the common decorative and protective choice; Type III is for functional wear surfaces.

Is 5052 a good choice for CNC machining? It excels at corrosion resistance and forming, but it is soft and gums up cutters, making fine machined finishes harder. For a heavily machined part needing a crisp finish, 6061 is usually better.

Why machine aluminum parts in Canada? Canada is the world's fourth-largest primary aluminum producer and makes some of the lowest-carbon aluminum on earth via hydroelectric smelting. Sourcing here keeps freight, lead times, and IP local, with a deep supply base in Quebec.

What file should I send for an aluminum machining quote? A STEP file (AP242 if available) plus a 2D drawing or model-based notes for tolerances, threads, and finish. Specify grade, temper, and anodizing type so the quote and lead time are accurate the first time.