🪶 MAGNESIUM
Magnesium Suppliers and Machining in Jacksonville, FL
Few metals split opinion in a coastal manufacturing town like magnesium does. It is the lightest structural metal a Jacksonville shop will ever cut, roughly two-thirds the density of aluminum, yet it lives a short drive from the Atlantic where salt spray punishes anything reactive. This page covers how buyers near NAS Jacksonville and the port corridor actually source AZ31B, AZ91D and WE43 magnesium without getting burned on corrosion or fire-risk machining.
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Why Jacksonville Shops Specify Magnesium
The pull toward magnesium in Jacksonville almost always traces back to weight. Rotorcraft and fixed-wing platforms serviced at the regional defense maintenance facilities carry magnesium gearbox housings, intermediate cases and instrument-panel structures that were designed decades ago precisely because every pound off the airframe extends range or payload. When those castings crack or corrode, the replacement has to match the original alloy and temper, which is why AZ91D sand and die castings and WE43 investment castings still move through the local supply base.
Beyond aviation, the renewable-energy work growing along Florida's coast occasionally calls for magnesium in handheld and portable equipment housings where vibration damping matters. Magnesium absorbs vibration far better than aluminum, and that property shows up in tooling, fixtures and enclosures where operators run equipment for long shifts. The trade-off buyers weigh is galvanic corrosion: any magnesium part bolted to steel or carbon-fiber structure in a humid, salty climate needs isolation or it will sacrifice itself fast.
AZ31B, AZ91D and WE43: Picking the Right Grade
AZ31B is the wrought workhorse, the grade you order as sheet, plate and extrusion for formed brackets and panels. It contains roughly 3% aluminum and 1% zinc, machines cleanly, and welds with the right shielding. For Jacksonville fabricators doing formed enclosures or structural sheet work, AZ31B-H24 is the common stocking temper because it balances strength and formability.
AZ91D is the die-casting alloy, with about 9% aluminum giving it higher strength and better castability for complex housings. The high-purity D designation matters in coastal service because tightly controlled iron, nickel and copper levels dramatically improve corrosion resistance versus older AZ91 variants. WE43 is the premium player, an yttrium and rare-earth alloy that holds strength up to roughly 250 degrees C and is the go-to for aerospace gearbox and helicopter transmission castings. WE43 costs multiples of AZ91D and demands tighter foundry control, so buyers reserve it for genuinely high-temperature or flight-critical applications rather than defaulting to it.
Machining and Fire-Safety Practices on the Shop Floor
Magnesium machines beautifully, it cuts faster than aluminum with lower cutting forces, but fine chips and dust are flammable, and that reality governs how Jacksonville shops set up. Reputable machine shops run magnesium with sharp tooling, high feed rates to keep chips coarse, and either dry cutting or mineral-oil coolant rather than water-based fluids that can react and liberate hydrogen. Class D fire extinguishers and dry sand stay within arm's reach, and dust collection is segregated from steel and aluminum swarf.
The practical upshot for buyers is that not every CNC shop in the metro will quote magnesium, and you should confirm a vendor has actually run it before. Shops with aerospace experience near the bases are the safest bet because they already carry the fire protocols and understand the chip-control discipline. Expect a shop to ask about your alloy, finish requirements and quantities up front so they can plan tool paths and housekeeping accordingly.
Frequently Asked Questions
You can get it done locally, but the pool of shops is smaller than for aluminum or steel because magnesium machining requires fire-safety protocols not every shop maintains. The strongest candidates are CNC and fabrication shops with aerospace and defense experience near NAS Jacksonville, since they already run the Class D fire safety, chip segregation and dry or mineral-oil cutting practices magnesium demands. When you request a quote, state your alloy (AZ31B, AZ91D or WE43), the part complexity, and quantities so the shop can confirm capacity. Some shops will machine castings supplied by you but will not pour the metal, while others coordinate casting through a foundry partner and finish-machine in house. Confirm both the machining and any required corrosion finishing can be handled before you commit, because shipping unfinished bare magnesium around the humid Florida coast invites surface oxidation before the part is even coated.
It depends entirely on the original part design, and for replacement components you should match what the engineering drawing specifies rather than substituting. That said, WE43 is the high-performance aerospace choice for parts that see elevated temperature or high stress, such as helicopter transmission and gearbox housings, because its yttrium and rare-earth content keeps strength stable up toward 250 degrees C. AZ91D is common for structural die-cast housings and brackets where temperatures stay moderate, and its high-purity chemistry resists corrosion better than older magnesium alloys, which matters in coastal service. AZ31B covers wrought sheet and extrusion needs like formed panels and structural brackets. For defense maintenance and repair, the safest path is to source the exact alloy and temper called out on the drawing and have the supplier certify chemistry and mechanical properties, because mixing grades on a flight-critical assembly is not acceptable to airworthiness authorities.
Corrosion control starts at material selection and never stops. First, specify a high-purity alloy like AZ91D rather than a legacy magnesium grade, because tightly controlled iron, nickel and copper levels slow galvanic attack. Second, never ship or store bare magnesium; require a conversion coating, anodize-type process, or a sealed primer-and-topcoat system appropriate to the application. Third, and most overlooked, isolate the magnesium from any dissimilar metal it touches. Use compatible fasteners, apply sealant at faying surfaces, and add barrier films where magnesium meets steel, carbon fiber or aluminum, because galvanic coupling in salty humid air will corrode the joint even when the rest of the part is perfectly coated. For parts that live outdoors or near the water, inspect coatings on a schedule and touch up any breaches immediately. A well-finished and properly isolated magnesium assembly performs fine on the coast; a bare or galvanically coupled one fails fast.
On raw material per pound, magnesium and aluminum are roughly comparable, but the total delivered cost of a magnesium part usually runs higher once you account for specialized machining, mandatory corrosion finishing, and a thinner supplier base. AZ31B and AZ91D are the economical magnesium options; WE43 costs several times more because of its rare-earth content and the tighter foundry control it demands, so reserve it for genuinely high-temperature or flight-critical uses. The reason engineers still pay the premium is weight: magnesium is about a third lighter than aluminum, and on aircraft and portable equipment that weight savings has real value. For a ground-based bracket where weight does not matter, aluminum is almost always the better economic choice. The honest answer is to let the application decide. If the design does not specifically need magnesium's low density or vibration damping, you will spend less and fight fewer corrosion battles with aluminum.
Last updated: July 2026
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