Magnesium Machining Suppliers for Aerospace in Wichita, KS

Magnesium is a specialty material rather than a staple, and two factors keep the capable base small. First is fire risk: fine magnesium chips and dust burn intensely and cannot be extinguished with water, so machining magnesium safely requires dedicated handling, clean chip and dust management, Class D fire suppression, and discipline that many general shops are unwilling to maintain. Second is demand: magnesium is used only where its weight savings justify the cost and handling, such as gearbox housings and lightweight brackets, so it never reaches the volume that aluminum or steel does, and fewer shops invest in the capability. The result is that general aerospace machining experience does not automatically extend to magnesium. The practical step for a buyer is to ask shops directly whether they currently run magnesium and how often, which quickly separates genuine capability from a mere willingness to try. Putting a magnesium job into a shop without real experience and fire-safe handling is a risk not worth taking, so verify the specific capability rather than assuming it.

Bulk magnesium is actually difficult to ignite, so a solid block or a finished part is not a casual fire hazard. The danger is in the fine chips, dust, and grinding swarf, which burn intensely once ignited and react with water, meaning water accelerates rather than extinguishes a magnesium fire. A shop machining magnesium safely manages this by using sharp tooling and appropriate feeds to produce coarse chips instead of fine dust, keeping the work area free of accumulated swarf, segregating magnesium from operations that could ignite it, and having Class D fire extinguishing media specifically rated for combustible metals on hand. Dust collection must be designed so magnesium dust cannot accumulate and ignite. When qualifying a shop, ask pointed questions about chip and dust management, fire suppression, and segregation. A vague or dismissive answer on fire safety is a disqualifier regardless of the shop's other credentials, because the consequences of a magnesium fire are severe and the discipline to prevent it is exactly what distinguishes a competent magnesium shop.

Magnesium corrodes readily, particularly through galvanic action when it contacts other metals, so corrosion protection is structural rather than cosmetic and is part of the spec. Aerospace magnesium parts are typically protected by a chromate conversion coating, a specialized anodizing process developed for magnesium, or sealing and painting, and often a combination. These are special processes, frequently NADCAP-controlled, so require the finish certification on delivery and confirm the specific process matches your drawing callout, since magnesium finishes differ in protection level and are not interchangeable. A separate and critical concern is galvanic isolation: wherever a magnesium part fastens to aluminum or steel, the assembly must be designed so the magnesium does not become the sacrificial anode and corrode away, usually through isolating coatings, gaskets, or compatible fasteners. This is primarily a design responsibility, but a knowledgeable supplier will flag it if the part appears destined for direct metal-to-metal contact. An unprotected or poorly finished magnesium part can degrade alarmingly fast in humid or salt-exposed service, so the finish is not a step to economize on.

The common wrought magnesium alloy is AZ31, used for sheet and extruded brackets and lightweight structure, while AZ91 is a common casting alloy used for housings such as gearbox and transmission cases. You may also encounter alloys like ZK60 or others selected for specific strength or casting properties. Magnesium machines well when handled correctly: it has low cutting forces, low power requirements, and produces good surface finishes at high speeds, so the machining itself is generally easier than aluminum. The entire challenge is in safe handling rather than cutting difficulty, since the same fast machining that makes magnesium pleasant to cut also produces chips that must be managed for fire safety. When sourcing, specify the alloy and condition explicitly, since wrought and cast magnesium alloys have different properties and applications, and require the mill certification confirming the grade. Confirm the shop runs your specific alloy form, whether wrought bar and sheet or castings, because a shop set up for one is not necessarily set up for the other, and the finishing and corrosion-protection requirements apply across both.