🪶 MAGNESIUM
Magnesium Suppliers & Machining in Sacramento, CA
Magnesium is the lightest structural metal in commercial use, roughly 35 percent lighter than aluminum, and that single fact is why Sacramento's aerospace and unmanned-systems shops keep it on the bench. The region's defense-adjacent contractors and renewable-energy hardware builders specify AZ31B sheet, AZ91D die castings, and WE43 for elevated-temperature work where pulling mass out of a rotating or flying assembly pays back directly in performance.
AS9100ISO 9001NADCAP
Why Sacramento Shops Specify Magnesium
The pull toward magnesium in the Sacramento corridor comes from the same place as everywhere in aerospace: stiffness-to-weight. With a density near 1.74 g/cm3 against aluminum's 2.70, a magnesium bracket, housing, or gearbox case can shed a third of its mass while holding usable strength. For the unmanned-aircraft and sensor-pod work that flows through regional defense suppliers, that delta decides whether a payload flies the mission or comes off the spec.
Local buyers most often reach for AZ31B in wrought form. It is the workhorse magnesium-aluminum-zinc alloy, available as sheet, plate, and extrusion, and it bends and machines predictably for airframe panels and electronics enclosures. AZ91D dominates the die-cast side, where its excellent castability and corrosion resistance suit high-volume housings, brackets, and cover plates that come off the tool near-net and need minimal cleanup.
WE43 is the specialty pick. This magnesium-yttrium-rare-earth alloy holds mechanical properties up past 250 C, which puts it in transmission housings, missile components, and helicopter gearbox parts where standard magnesium would creep. It costs more and demands tighter process control, but for Sacramento's defense-tier programs it is sometimes the only magnesium that qualifies.
Machining and Casting Magnesium Locally
Magnesium is one of the most machinable structural metals there is. Cutting forces run low, chips break clean, and shops routinely run high spindle speeds with excellent surface finishes. The catch is fire safety: fine magnesium chips and dust ignite, and once burning they cannot be put out with water. Sacramento shops set up for magnesium keep dedicated tooling, flood coolant or dry-cut protocols, sealed chip collection, and Class D extinguishing media on the floor. When you vet a local supplier, confirm they run magnesium regularly rather than as a one-off.
On the casting side, AZ91D is the standard for high-pressure die casting, producing thin-wall housings and structural brackets at volume. Sand and permanent-mold casting cover lower volumes and larger parts. For machined-from-billet work, AZ31B and WE43 plate feed CNC milling and turning for prototypes and short runs typical of defense development programs.
Finishing matters more with magnesium than most metals because bare magnesium corrodes. Chromate conversion coatings per the older MIL-DTL-5541 lineage, anodizing, and powder or e-coat systems all show up on Sacramento parts. Specify the finish up front, since it drives both the alloy choice and the supplier's process flow.
Sourcing Through ManufacturingBase
Finding a shop that genuinely handles magnesium is harder than finding one that machines aluminum, precisely because of the fire-control requirements. ManufacturingBase lets Sacramento buyers filter for magnesium capability, AS9100 and NADCAP certification, and the specific process they need, whether that is die casting AZ91D, milling WE43, or forming AZ31B sheet.
For aerospace and defense programs, certification is non-negotiable. AS9100 is the aerospace quality baseline, NADCAP accredits the special processes like heat treat and chemical processing, and many programs add ITAR registration for controlled technical data. Filter on these before you request a quote so you are only talking to shops that can actually deliver a flight-grade part.
List your magnesium grade, temper, finish callout, and quantity when you post a requirement, and you will get back suppliers equipped to run the material safely and to print.
Frequently Asked Questions
For most aerospace bracketry the choice comes down to how the part is made and how hot it runs. If you are machining or forming from wrought stock, AZ31B is the default: it offers good strength, weldability, and formability as sheet, plate, or extrusion, and it is widely stocked. If you are die casting at volume, AZ91D gives excellent castability and corrosion resistance for housings and brackets near net shape. If the bracket sees sustained temperatures above roughly 150 to 200 C, near an engine, transmission, or high-power electronics, step up to WE43, which holds properties past 250 C thanks to its yttrium and rare-earth content. Sacramento's aerospace-defense suppliers can advise on the tradeoff, but the practical rule is AZ31B for general wrought parts, AZ91D for cast volume, and WE43 only when temperature or a program spec forces it, since it carries a real cost premium.
Magnesium is among the easiest structural metals to machine in terms of cutting forces and finish, but it carries a genuine fire hazard that aluminum does not. Fine chips, dust, and swarf can ignite, and a magnesium fire burns extremely hot and reacts violently with water, so it requires Class D dry-powder extinguishers, never a standard water or CO2 unit. Shops set up for magnesium run sharp dedicated tooling, control chip size, use appropriate coolant strategies, keep chip volumes low and contained, and store swarf in sealed metal containers away from moisture. Many Sacramento CNC shops that serve aerospace already run magnesium routinely and have these controls in place. The key when sourcing is to confirm the supplier handles magnesium as a regular part of their work rather than as an exception, since the safety setup is specific and not something a shop improvises mid-job.
Bare magnesium is electrochemically active and will corrode, especially in salt or humid environments, so nearly every functional magnesium part gets a protective finish. The most common treatments are chromate conversion coatings, which form a thin protective layer and serve as a paint base, and anodizing processes that build a harder, thicker oxide. On top of that, parts often receive powder coat, e-coat, or primer-and-topcoat systems for full environmental protection. Galvanic corrosion is a particular concern: when magnesium contacts dissimilar metals like steel fasteners, you need isolation through coatings, sealants, or compatible hardware to prevent accelerated attack at the joint. Specify the finish and any fastener interface details up front, because they influence alloy selection and the supplier's process routing. Sacramento aerospace suppliers handle these finishing flows regularly, but the corrosion strategy should be designed in from the start rather than added as an afterthought.
For aerospace and defense magnesium parts coming out of the Sacramento area, AS9100 is the foundational quality management certification, building on ISO 9001 with aerospace-specific requirements for traceability, configuration control, and risk management. NADCAP accreditation is critical for special processes, the heat treating, chemical processing, conversion coating, and nondestructive testing that magnesium parts frequently require, since these processes cannot be fully verified by inspecting the finished part. Many defense programs also require ITAR registration because magnesium components for military aircraft, missiles, and unmanned systems fall under controlled technical data rules. When you evaluate a supplier, confirm AS9100 at minimum, NADCAP for whatever special processes your part needs, and ITAR registration if the work is defense-related. ManufacturingBase lets you filter Sacramento suppliers on exactly these credentials so you spend quoting time only with shops that can legally and technically deliver.
Last updated: July 2026
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