🪶 MAGNESIUM
Magnesium Machining and Casting Suppliers in Pittsburgh, PA
Magnesium is the lightest structural metal in common use, and Pittsburgh's aerospace-defense and weight-critical work creates steady, if specialized, demand for it. Buyers source AZ31B sheet and extrusion for formed components, AZ91D die castings for housings, and ZK60A where higher strength is needed. Because magnesium machining carries genuine fire risk, ManufacturingBase helps you find Pittsburgh suppliers who handle it safely and hold the certifications that critical applications require.
AS9100NADCAPISO 9001
Magnesium occupies a specialized niche, chosen specifically when weight is the dominant constraint. At roughly two-thirds the density of aluminum, it delivers structural function at a weight penalty that no other common metal can match, which is why it appears in aerospace housings, gearbox and transmission casings, and weight-sensitive defense hardware. Pittsburgh's aerospace-defense base and its lightweighting work on equipment generate the demand.
The grade follows the form and function. AZ31B is the common wrought grade for sheet, plate, and extrusion used in formed and fabricated parts. AZ91D is the dominant die-casting alloy for housings and complex shapes produced in volume. ZK60A and similar higher-strength wrought grades serve more demanding structural parts. Each behaves differently, and matching grade to process is part of a knowledgeable supplier's value.
Because magnesium is less common than aluminum, fewer shops handle it, and the ones that do tend to be deliberate about it. That is a feature, not a bug, because the safety and process discipline magnesium demands separates capable suppliers from those who should not touch it.
Fire safety and why shop selection is critical
The defining sourcing consideration for magnesium is fire risk, and it cannot be overstated. Magnesium chips, fines, and dust are flammable, and a magnesium fire burns intensely and reacts violently with water, which means a standard shop's instinct to grab a water extinguisher makes things catastrophically worse. Shops that machine magnesium properly use dry-cutting or carefully managed coolant strategies, keep tools sharp to avoid generating fine swarf, control and contain chips diligently, and stock Class D fire suppression for metal fires.
This is why shop selection matters more for magnesium than almost any other material. A shop without magnesium experience handling it occasionally is a genuine hazard, not just a quality risk. Ask any prospective Pittsburgh supplier directly about their magnesium fire-safety protocols, chip handling, and suppression equipment. A capable shop answers confidently and specifically; hesitation is your signal to look elsewhere.
On ManufacturingBase, filter for suppliers with the right certifications and capability, then verify magnesium handling explicitly during qualification. Do not assume a good aluminum shop is automatically equipped for magnesium, because the safety requirements are fundamentally different.
Corrosion protection and finishing
Magnesium's other major consideration is corrosion. Untreated magnesium corrodes readily, especially galvanically when coupled with dissimilar metals, so nearly all magnesium parts require a protective finish. Chromate conversion coatings and anodize-type treatments such as those meeting aerospace magnesium finishing specs are standard, and the finish should be called out explicitly on the drawing.
Galvanic isolation is equally important in assembly: where magnesium contacts steel, aluminum, or fasteners of dissimilar metal, the design must isolate the joint to prevent accelerated corrosion, and your supplier and design team should coordinate on this. Confirm the shop coordinates the conversion coating or anodize step and provides finishing documentation.
For finished parts, require material certification confirming the alloy, the finish certification calling out the spec and type, and for aerospace work the appropriate first-article inspection. Establishing the corrosion-protection requirements upfront is essential, because an unprotected magnesium part can begin corroding quickly and a galvanic mismatch in assembly can destroy a part that was perfectly made.
Frequently Asked Questions
Magnesium machining carries genuine fire risk that sets it apart from nearly every other common metal. Magnesium chips, fines, and dust are flammable, and a magnesium fire burns extremely hot and reacts violently with water, so the reflexive use of a water extinguisher makes the situation dramatically worse. Shops that handle magnesium correctly use appropriate dry-cutting or controlled coolant strategies, keep tools sharp to minimize fine swarf, rigorously contain and dispose of chips, and keep Class D dry-powder extinguishers rated for metal fires on hand. A shop without this discipline is a real safety hazard, not merely a quality concern. For that reason, shop selection matters more for magnesium than for almost any other material. When sourcing in Pittsburgh, ask prospective suppliers directly about their fire-safety protocols, chip handling, and suppression equipment, and treat any hesitation as a reason to look elsewhere. Critically, do not assume a competent aluminum shop is automatically equipped for magnesium, because the safety requirements are fundamentally different and must be verified explicitly.
For wrought applications such as sheet, plate, and extrusion used in formed and fabricated parts, AZ31B is the common grade, offering good formability and a reasonable strength-to-weight balance. For die-cast housings and complex shapes produced in volume, AZ91D is the dominant alloy, valued for castability and corrosion resistance among magnesium alloys. When higher strength is required for more demanding structural parts, ZK60A and similar zirconium-containing wrought grades are specified. Pittsburgh's aerospace-defense base and broader lightweighting work drive demand for these grades wherever weight is the controlling design constraint, since magnesium is roughly two-thirds the density of aluminum. Each grade behaves differently in machining, forming, and finishing, so matching grade to both the part form and the manufacturing process is part of the value a knowledgeable supplier provides. Because fewer shops handle magnesium than aluminum, the suppliers who do tend to be deliberate and experienced, which is exactly what this material requires given its safety and corrosion considerations.
Untreated magnesium corrodes readily, and it is especially vulnerable to galvanic corrosion when in contact with dissimilar metals, so virtually all magnesium parts require a protective finish. Chromate conversion coatings and anodize-type treatments, including those meeting aerospace magnesium finishing specifications, are standard and should be called out explicitly on the drawing with the spec and type. Beyond the surface finish, galvanic isolation in assembly is critical: wherever magnesium contacts steel, aluminum, or dissimilar-metal fasteners, the design must isolate the joint with coatings, sealants, or insulating hardware to prevent accelerated galvanic attack. Coordinate this between your design team and supplier early. For finished parts in Pittsburgh, require material certification confirming the alloy, finish certification documenting the applied coating spec and type, and appropriate first-article inspection for aerospace work. Specifying corrosion protection upfront is essential, because an unprotected magnesium part can begin corroding quickly, and a galvanic mismatch in assembly can ruin a part that was otherwise manufactured perfectly.
Aerospace magnesium parts carry stringent documentation because of their weight-critical, often structural roles. Require material certification traceable to confirm the exact alloy and temper, since magnesium grades differ significantly in properties. For finished parts, require finish certification documenting the conversion coating or anodize treatment, including the applicable specification, type, and class, because corrosion protection is integral to magnesium part performance. For AS9100 work, expect an AS9102 first-article inspection report correlated to the bubbled drawing and full conformance to the drawing revision. Any specified nondestructive examination should arrive with reports and inspector certifications. Given magnesium's fire-handling requirements, it is also worth confirming the supplier's process controls during qualification, even though that is operational rather than per-part documentation. Establish the full documentation package with your Pittsburgh supplier before production begins, since reconstructing traceability and finish records after the fact is difficult, and missing documentation can disqualify an otherwise sound part during a customer or regulatory audit in the aerospace supply chain.
Last updated: July 2026
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