🪶 MAGNESIUM
Magnesium Suppliers and Machining in Colorado Springs, CO
With a density roughly two-thirds that of aluminum, magnesium is the metal Colorado Springs engineers reach for when mass is the enemy. Between Peterson, Schriever, and the surrounding space and missile defense ecosystem, the city's buyers source AZ31B sheet, AZ91D castings, and WE43 for elevated-temperature work. This page covers how those grades are bought, machined, and finished locally.
AS9100ISO 9001ITAR
Why Magnesium Fits Colorado Springs Programs
The defense and space programs anchored around Colorado Springs live and die by mass budgets. Every gram lifted to orbit or carried on a missile interceptor costs propellant, and magnesium's 1.74 g/cm3 density gives designers the lightest metallic option short of exotic composites. That is why housings, brackets, gimbal components, and optical mounts on space-system hardware are frequently specified in magnesium alloys rather than 6061 aluminum.
Magnesium also damps vibration better than aluminum, which matters for the electro-optical and guidance payloads developed in the region. A WE43 or AZ91D housing around a sensitive sensor reduces resonance transmitted from launch and slew events. For ground-support and avionics enclosures, the alloy's natural EMI shielding and machinability make it attractive where weight and signal integrity both matter.
The trade-off buyers manage locally is corrosion and ignition risk. Magnesium galvanically corrodes when coupled to steel or aluminum without isolation, and fine chips can ignite during machining. Colorado Springs shops handling defense work treat both as routine: they specify chromate or anodize finishes, isolate fasteners, and run flood coolant or dedicated dry-machining cells with Class D extinguishing on hand.
Grade Selection: AZ31B, AZ91D, and WE43
AZ31B is the wrought workhorse, supplied as sheet, plate, and extrusion. With roughly 3% aluminum and 1% zinc, it forms and machines cleanly and is the default for brackets, panels, and formed enclosures. Buyers sourcing AZ31B in Colorado Springs typically need it for non-structural to lightly loaded parts where the priority is weight reduction over peak strength, and it accepts chromate conversion coatings well for corrosion protection.
AZ91D is the dominant die-casting alloy, with about 9% aluminum and 0.7% zinc and tightly controlled iron, nickel, and copper to keep corrosion resistance high. It is the grade behind the bulk of cast magnesium housings, covers, and structural castings used in avionics and ground equipment. Its high castability lets foundries produce thin-wall enclosures with integrated bosses and ribs that would otherwise require multiple machined aluminum parts.
WE43 is the premium choice for the region's most demanding space and defense applications. Alloyed with yttrium and rare-earth elements, it retains strength up to roughly 250 C and offers far better creep resistance than AZ alloys, so it appears in gearbox housings, missile components, and high-temperature structural castings. It costs significantly more and has a longer lead time, so buyers reserve it for parts where AZ91D would soften or creep in service.
Machining, Casting, and Finishing Locally
Magnesium is one of the most machinable structural metals, cutting at high speeds with low power draw, which suits the CNC machining and precision capabilities common to Colorado Springs defense shops. Cutting speeds well above those used for aluminum are normal, and surface finishes are excellent. The discipline is in chip management: shops keep tooling sharp to avoid fine chips, use coolant suited to magnesium, and maintain Class D fire suppression rather than water-based systems.
For cast parts, buyers either source AZ91D die castings from regional foundries or have sand and investment castings produced for lower volumes and WE43 work, then bring them to local shops for finish machining of mating surfaces, bearing bores, and threaded features. Welding and fabrication shops in the area can TIG-weld magnesium for repair and assembly, though most defense parts are designed to minimize welded joints in favor of cast or machined monolithic structures.
Finishing is where corrosion control is won. Chromate conversion coating per the relevant defense spec is the baseline, with anodize-type treatments and primer-plus-topcoat systems used for harsher exposure. Quality inspection on these parts routinely includes dimensional verification against tight tolerances, coating thickness checks, and, for flight hardware, material certs traced back to the melt.
Buying Magnesium in the Colorado Springs Supply Chain
Few mills produce magnesium stock, so most material flows through specialty metal distributors and is shipped into the region against AS9100 and ITAR-controlled purchase orders. Buyers should plan for full material certification, melt traceability, and, for defense end-use, ITAR-compliant handling from the distributor through the shop floor. WE43 in particular has a limited supplier base and benefits from early sourcing.
Because magnesium is a controlled and sometimes export-sensitive material, Colorado Springs buyers tend to consolidate orders and qualify a small number of distributors and machine shops rather than spot-buy. ManufacturingBase exists to map those qualified suppliers so a program manager can find a shop that already holds the certifications, fire-suppression infrastructure, and finishing partners needed for magnesium defense work.
Frequently Asked Questions
Yes, when handled by a shop set up for it. Magnesium machines beautifully at high cutting speeds with low cutting forces, and most Colorado Springs defense shops produce clean, accurate parts in it routinely. The real concern is fire: fine magnesium chips and dust can ignite, so qualified shops keep tooling sharp to avoid producing fine swarf, use coolants compatible with magnesium, store chips in covered metal containers, and keep Class D extinguishing media on hand rather than relying on water, which reacts with burning magnesium. They also manage chip volume so accumulation never builds up around the machine. For flight and missile hardware, the same shops pair safe machining with full material traceability and coating control. When you source through a shop that already runs magnesium regularly, the safety considerations are a solved, documented part of their process rather than a risk you take on.
It depends on the temperature and load the housing will see. For most enclosures, sensor mounts, and brackets that stay near ambient to moderately warm, AZ91D as a die casting or AZ31B as wrought stock gives excellent weight savings, good machinability, and proven corrosion behavior once chromate-coated. If the housing surrounds a gearbox, actuator, or any component that runs hot, or if it must resist creep under sustained load at elevated temperature, WE43 is the right call because it holds strength to roughly 250 C where the AZ alloys begin to soften. The trade-off is cost and lead time: WE43 carries a significant price premium and a thinner supplier base, so reserve it for parts that genuinely need its high-temperature performance. A Colorado Springs shop experienced with space hardware can review your thermal and structural requirements and recommend the lowest-cost grade that still meets the mission profile.
Magnesium is anodic to nearly every other structural metal, so it corrodes quickly if left bare or coupled directly to steel or aluminum fasteners without isolation. The standard protection on defense hardware starts with a chromate conversion coating to the applicable defense specification, which both passivates the surface and provides a base for paint. For harsher environments, shops add an anodize-type treatment followed by primer and topcoat. Equally important is galvanic isolation at joints: dissimilar-metal fasteners are isolated with coatings, washers, or sealants so the magnesium does not become a sacrificial anode. High-purity grades like AZ91D, which tightly limit iron, nickel, and copper, also corrode more slowly than older magnesium alloys. A qualified Colorado Springs finisher will verify coating thickness and adhesion as part of quality inspection, and for flight hardware will document the entire finishing process against the program's requirements.
Yes, but plan ahead. WE43 is a rare-earth-alloyed magnesium grade with a limited supplier base, so it is not a stock item most distributors keep in depth. For prototype quantities, you will typically work with a specialty metals distributor to source a small lot of wrought stock, or commission a sand or investment casting from a foundry that pours WE43. Either path carries longer lead time than ordering common aluminum, so engage suppliers early in the design cycle. Because the material is expensive and sometimes export-controlled, expect full melt certification and ITAR-compliant handling on the order. Many programs prototype the geometry in AZ91D or aluminum first to validate fit and function, then switch to WE43 only for the parts that need its elevated-temperature performance, which keeps prototype cost down. ManufacturingBase can help you find regional shops and distributors that already work with WE43 so you are not qualifying a new supplier under schedule pressure.
Many do, because the local manufacturing base is built around defense and space programs that require it. ITAR compliance affects the entire chain: the distributor supplying the magnesium, the machine shop cutting it, and any finishing partner all need to handle the material and the associated technical data under export-control rules. When you source magnesium for defense end-use in Colorado Springs, confirm the supplier is ITAR-registered and that they restrict access to drawings, specifications, and parts to authorized U.S. persons. Pair that with AS9100 quality certification for flight hardware so you get the documentation, traceability, and process control aerospace programs demand. The advantage of sourcing in this region is that many shops already operate inside that compliance framework as a matter of course, so you spend less time qualifying basic controls. ManufacturingBase lets you filter for suppliers that already hold ITAR and AS9100 so the ones you contact are a realistic fit for controlled magnesium work.
Last updated: July 2026
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