Magnesium Suppliers in Portland, OR

Karl Gillihan

🪶 MAGNESIUM

Magnesium Machining and Casting Suppliers in Portland, OR

Magnesium is the lightest structural metal in routine production use, and Portland buyers reach for it when an electronics enclosure, a handheld instrument body, or an aerospace bracket needs to shed grams without surrendering stiffness. The local supply story runs through the same precision shops that feed Intel's Hillsboro fabs and the region's aerospace tier suppliers, where tight tolerances and clean surface finishes are the baseline expectation rather than a premium add-on.

ISO 9001AS9100ISO 14001

Why Portland Buyers Specify Magnesium

Magnesium runs roughly 35 percent lighter than aluminum at a comparable volume, with a density near 1.74 g/cm3 against aluminum's 2.70. For Portland's instrument and electronics designers, that weight advantage shows up directly in handheld metrology tools, camera and imaging housings, and the structural frames inside semiconductor inspection equipment, where every gram of moving mass affects settling time and operator fatigue. The second draw is damping. Magnesium absorbs vibration far better than aluminum or steel, which matters in the precision-motion stages and optical mounts that the Silicon Forest's tool builders assemble. A magnesium bracket holding a sensor head will quiet ringing that an aluminum part would transmit, and that quieting can shave real time off a measurement cycle. The tradeoff Portland engineers weigh is corrosion. Bare magnesium is reactive, so most parts ship with a chromate-free conversion coating, an anodize-style finish such as Tagnite or Keronite, or a powder topcoat. Local shops that serve the aerospace and electronics base are used to specifying these finishes up front, because retrofitting corrosion protection after a part fails in the field is far more expensive than building it into the first order.

01

AZ31B, AZ91D, and WE43 in Practice

AZ31B is the workhorse wrought grade, supplied as sheet, plate, and extrusion. Portland shops machine and bend it for electronics chassis, brackets, and panels where moderate strength and good formability matter more than peak performance. It welds cleanly with the right shielding and takes conversion coatings well, which is why it dominates the lighter-duty enclosure work coming out of the Silicon Forest. AZ91D is the dominant die-casting alloy. Its high aluminum content gives it excellent castability and good as-cast corrosion resistance, making it the default for thin-wall housings produced in volume, things like instrument shells, power-tool bodies, and electronics covers. Buyers sourcing AZ91D in the Portland area are usually after net-shape parts that need minimal secondary machining, so casting quality and porosity control are the questions to press a supplier on. WE43 is the high-performance grade, an yttrium and rare-earth alloy that holds strength at elevated temperature and is qualified on numerous aerospace programs. It costs more and machines slower, but for aerospace-defense brackets, gearbox housings, and components that see heat near 250 C, it is the grade that survives where AZ alloys soften. Portland's AS9100 shops are the right address for WE43 because the material almost always carries full traceability and lot certification requirements.

02

Machining Magnesium Safely

Magnesium machines beautifully, it cuts fast, produces low cutting forces, and holds tolerances with little tool wear. The catch is fire risk: fine chips and dust ignite, and water-based coolants can react to release hydrogen. Reputable Portland shops that run magnesium treat it as a managed process, using dry machining or mineral-oil coolant, sharp dedicated tooling, controlled chip evacuation, and Class D extinguishing media on hand. When you source magnesium parts locally, ask whether the shop runs magnesium on segregated equipment or shares machines with other metals. Cross-contamination of magnesium chips into a steel-or-aluminum chip stream is a genuine hazard, and the shops that take it seriously will have clear answers. The capability to machine magnesium safely is, in practice, a useful proxy for overall process discipline.

03

Sourcing Workflow in the Silicon Forest

Most Portland magnesium buyers split their sourcing by form. Prototype and low-volume structural parts go to CNC shops working from AZ31B plate or WE43 billet, while high-volume housings go to die casters running AZ91D. Knowing which path a part belongs on before you request quotes saves a round of back-and-forth and gets you comparable pricing. ManufacturingBase lets you filter Portland-area suppliers by capability, alloy experience, and certification, so an aerospace buyer needing AS9100 WE43 work and an electronics OEM needing coated AZ31B enclosures land on different, appropriate shortlists. Send the same drawing package, finish callout, and quantity to three or four matched shops, and compare not just price but lead time, finishing options, and whether they can hold the corrosion-protection spec your application demands.

Frequently Asked Questions

Yes. Portland's aerospace-defense supply base includes AS9100-certified machine shops that handle WE43, the yttrium and rare-earth magnesium alloy used on flight hardware. WE43 is specified for brackets, housings, and components that must hold strength at elevated temperatures near 250 C where standard AZ alloys would soften. The key requirement is traceability: aerospace WE43 work almost always demands full material certification, lot tracking, and documented heat treatment, so you want a shop with the quality system to support that paper trail. When you request quotes through ManufacturingBase, filter for AS9100 and confirm the supplier has prior magnesium experience specifically, since WE43 machines differently from the more common AZ31B and AZ91D grades and demands the same fire-safety discipline. Expect longer lead times and higher material cost than aluminum equivalents, which is the normal tradeoff for the weight savings and high-temperature performance WE43 delivers.

Magnesium is safe to machine when handled by a shop that respects the material, and many Portland precision shops do exactly that. The risk comes from fine chips and dust, which can ignite, and from water-based coolants that can react with magnesium to release hydrogen gas. Shops that run magnesium properly use dry machining or mineral-oil-based coolant, keep tooling sharp to avoid generating excessive heat and fines, control and contain chip evacuation, and keep Class D fire extinguishing media on hand rather than the standard ABC extinguishers that are ineffective on metal fires. Many also segregate magnesium work onto dedicated machines to avoid mixing magnesium fines into aluminum or steel chip streams. When sourcing locally, ask any prospective supplier directly how they manage magnesium chips and what extinguishing media they keep nearby. A clear, specific answer is a good sign; vagueness is a reason to look elsewhere.

The right grade depends on how the part is made and what it has to do. AZ31B is a wrought alloy supplied as sheet, plate, and extrusion, and it is the default for machined or formed parts like electronics chassis, brackets, and panels that need moderate strength and good formability. AZ91D is a die-casting alloy, so it is the choice when you need net-shape housings or covers produced in volume with thin walls and minimal secondary machining; it also offers good as-cast corrosion resistance. WE43 is the high-performance grade, used when the part must retain strength at elevated temperature or meet aerospace qualification, at higher cost and slower machining. A practical way to decide in Portland: if you are machining from stock, start with AZ31B and step up to WE43 only if temperature or program requirements force it; if you are casting in quantity, AZ91D is almost always the answer. Suppliers on ManufacturingBase can advise on the tradeoff once they see your drawing and volume.

Bare magnesium is chemically reactive and will corrode in service, so nearly every production part ships with a protective finish. Common options include conversion coatings that prepare and passivate the surface, anodize-style ceramic coatings such as Tagnite or Keronite that build a hard corrosion-resistant layer, and powder or wet topcoats applied over a primer. The right choice depends on the environment: an indoor electronics enclosure in a Portland lab needs less protection than an aerospace bracket exposed to humidity, salt, or temperature cycling. It is important to specify the finish on your drawing up front rather than treating it as an afterthought, because magnesium that reaches the field without adequate protection can fail quickly and replacing it is far more costly than coating it correctly the first time. Many Portland shops that serve the aerospace and electronics base either apply these finishes in-house or manage trusted coating partners, so ask about finishing capability when you request quotes.

Magnesium is roughly a third lighter than aluminum, with a density near 1.74 g/cm3 versus aluminum's 2.70, and it damps vibration substantially better. For Silicon Forest electronics and instrument work, those two properties are the reasons to choose it: lighter handheld tools and imaging housings reduce operator fatigue and moving mass, while better damping quiets the precision-motion stages and optical mounts inside inspection and metrology equipment. The tradeoffs are cost and corrosion. Magnesium stock and casting cost more than aluminum, and magnesium requires a corrosion-protection finish that aluminum often does not. It also has lower stiffness than steel and is more reactive to machine. For a part where weight and vibration genuinely drive the design, magnesium earns its premium; for a part where neither is critical, aluminum is usually the more economical default. Portland shops experienced in both can run the comparison against your specific tolerances and volume.

Last updated: July 2026

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