ðŠķ MAGNESIUM
Magnesium Machining and Fabrication in Nashua, NH
Magnesium sits at the intersection of structural rigidity and minimum mass â a combination that Nashua's defense and semiconductor equipment suppliers cannot substitute away from. Southern New Hampshire's manufacturing ecosystem has built real capability around magnesium alloy machining because programs in the BAE Systems defense electronics corridor demand enclosures, housings, and brackets that shave every gram without sacrificing dimensional stability under thermal cycling. Sourcing magnesium parts locally means faster iteration, direct process conversation with machinists, and supply-chain continuity on long-lifecycle programs.
AS9100ISO 9001ITAR
Why Magnesium Alloys Belong in Defense and Semiconductor Enclosures
Magnesium is roughly 35 percent lighter than aluminum by volume, and that density advantage translates directly to payload margin on airborne platforms and reduced inertial load on semiconductor equipment gantries. AZ31B sheet and plate is the workhorse grade for formed enclosures and weld assemblies; its balanced extrudability and moderate strength make it the default when a Nashua shop is asked to prototype a new electronics housing for a defense subcontract. Machinability ratings for AZ31B run exceptionally high â cutting speeds in the 1,500 to 2,500 surface-feet-per-minute range are routine with sharp, high-positive-rake carbide tooling, which compresses cycle times on complex five-axis pockets.
AZ91D die-cast alloy occupies a different niche: high-volume housing components where near-net-shape casting reduces the machined stock removal to finish-critical surfaces only. Nashua-area shops with EDM and jig boring capability can hold tolerances of plus or minus 0.001 inch on bearing bores and connector pilot diameters in AZ91D castings after minimal machining. The alloy's good pressure tightness makes it attractive for sealed electronics enclosures where moisture ingress is a qualification failure mode.
WE43 is the elevated-temperature and corrosion-resistant grade â yttrium and rare-earth additions push the usable service temperature well above what AZ-series alloys handle. For programs where magnesium components see sustained elevated temperatures, such as engine-adjacent avionics brackets or thermal management structures, WE43 is specified despite its higher material cost and more demanding machining requirements. Nashua suppliers familiar with aerospace metallurgy qualify WE43 processes under AS9100 discipline, with first-article inspection records and material traceability back to certified mill sources.
Machining Magnesium Safely: Process Controls Nashua Shops Maintain
Magnesium's fire risk during machining is real but entirely manageable with the process controls that experienced Nashua shops keep in place. Fine chips and dust are the hazard, not the bulk workpiece. Shops running magnesium maintain dry machining protocols or use purpose-formulated cutting fluids â never water-based coolants, which react with magnesium and generate hydrogen gas. Dedicated chip collection systems with Class D extinguishers stationed at each magnesium-capable machine are standard. Operators trained on magnesium know to keep chip bins emptied on a shift schedule and to avoid letting fine swarf accumulate near heat sources.
From a dimensional standpoint, magnesium's low elastic modulus (about 6.5 million psi, compared to aluminum's 10 million) means fixtures must distribute clamping force carefully to avoid deflection on thin-walled sections. Nashua machinists working on precision aerospace housings typically use full-contact soft jaws or dedicated nest fixtures machined from aluminum to support the workpiece uniformly. Finishing passes at reduced depth of cut â 0.005 to 0.010 inch axial â with very sharp tooling produce surfaces that check to drawing callouts without stress-induced spring-back affecting final dimensions.
Coating magnesium is a required final step for most defense and semiconductor applications because the bare alloy corrodes readily in humid environments. Chromate conversion, anodizing via the Keronite or Tagnite process, and powder coat over conversion coating are the common sequences Nashua shops specify. For ITAR-controlled defense components, the finishing supplier must also be ITAR-registered, and Nashua's proximity to the broader New England defense supply chain means qualifying compliant finishers is straightforward.
Sourcing AZ31B, AZ91D, and WE43 Through the Nashua Supply Network
Raw magnesium stock â billet, plate, and extrusion â arrives at Nashua shops primarily through established metals distributors serving the New England aerospace market. Lead times on AZ31B plate in standard thicknesses (0.250 through 1.000 inch) typically run one to two weeks from stock. AZ91D die castings are either sourced from domestic foundries with established aerospace quality systems or cast regionally in New England; Nashua shops with casting relationships can quote cast-plus-machine as a single-source package. WE43 billet is a specialty order with four to eight week lead times from qualified aerospace-grade producers, which makes early material planning on WE43 programs essential.
For buyers placing magnesium on the ManufacturingBase platform, specifying the exact alloy designation, temper, and applicable material specification (AMS 4375 for AZ31B sheet, AMS 4490 for AZ91D die castings) eliminates ambiguity at the quoting stage. Nashua shops quoting competitive bids appreciate buyers who also specify surface finish in Ra microinch, geometric tolerances per ASME Y14.5, and required certifications â it removes back-and-forth and shortens the time from RFQ to awarded purchase order on tight-schedule programs.
Quality Inspection and First-Article Requirements for Magnesium Parts
Defense and semiconductor equipment buyers sourcing magnesium from Nashua suppliers typically require first-article inspection reports (FAIRs) per AS9102 for new part numbers. Nashua shops with CMM capability â Zeiss, Hexagon, or Renishaw platforms are common in the region â generate dimensional reports in DMIS or PDF format that document every ballooned characteristic on the engineering drawing. Material certifications with chemistry and mechanical properties traceable to the heat number accompany each shipment.
Non-destructive inspection requirements for magnesium aerospace parts sometimes include fluorescent penetrant inspection (FPI) to detect surface cracks on safety-critical features. Nashua and the broader southern New Hampshire industrial corridor have qualified FPI providers either in-house at larger shops or as nearby sub-tier suppliers. For programs with stringent source inspection requirements, Nashua's geographic position â about 45 miles from Boston Logan and close to multiple defense prime contractor locations across New England â makes customer source inspection practical without excessive travel burden on program teams.
Frequently Asked Questions
AZ31B is the first choice for most Nashua shops machining aerospace electronics housings from wrought plate or billet. Its combination of good machinability, adequate tensile strength (around 29,000 psi yield in the H24 temper), and availability in flat plate simplifies fixturing and allows high cutting speeds that keep cycle times competitive on complex five-axis pockets. For parts that require die casting to achieve complex external geometry with thin walls, AZ91D shifts the economics favorably because the near-net-shape casting minimizes material removal. WE43 is reserved for applications where the housing will see sustained elevated temperatures above 250 degrees Fahrenheit or where corrosion in a humid environment is a qualification risk â its rare-earth additions improve both properties significantly over the AZ series, but at a material cost premium of three to five times AZ31B. Nashua shops with aerospace pedigree will walk buyers through the grade tradeoff during quoting if the application requirements are clearly stated.
Fire prevention in magnesium machining centers on chip management and cutting fluid selection. Experienced Nashua shops run magnesium dry or with dedicated magnesium-safe cutting oils â never water-soluble coolants, which generate hydrogen gas on contact with hot magnesium chips. The real hazard is accumulated fine swarf, so machine operators clear chip pans on a strict schedule, typically every two to four hours depending on material removal rate, and route chips to sealed, grounded metal containers away from the machine tool. Class D fire extinguishers rated for combustible metals are stationed at each magnesium-capable machine. At the programming level, machinists avoid tool dwell that creates friction heat, maintain sharp tooling with positive rake angles, and keep chip loads high enough to produce continuous chips rather than fine dust. These protocols are standard operating procedures at AS9100-certified shops, not ad-hoc measures, so buyers should expect to see documented work instructions and operator training records as part of any quality audit.
Bare magnesium corrodes in humid or salt-laden environments, so virtually every production magnesium part leaving a Nashua shop receives a surface treatment. The most common sequence for defense electronics enclosures is chromate conversion coating (per MIL-M-3171 Type VI or similar) followed by primer and topcoat, which provides the multi-layer barrier needed for avionics qualification. For parts where dimensional tolerance on coated surfaces is critical, Tagnite or Keronite plasma electrolytic oxidation anodizing is preferred because these processes build a hard, well-adhered ceramic layer in the 5 to 25 micron range with predictable dimensional growth. Powder coat over conversion coating is economical for non-critical surfaces. For semiconductor equipment components where outgassing is a concern, anodized-only finishes without organic topcoats are sometimes specified. Nashua's proximity to the New England aerospace finishing network â including shops in Manchester and the Merrimack Valley â means most finish options are available within a one-day turnaround for shipping, keeping overall program lead times tight.
For defense programs involving magnesium components, the baseline certifications to require are AS9100 (aerospace quality management system) and ITAR registration (International Traffic in Arms Regulations). AS9100 ensures the shop maintains rigorous document control, first-article inspection discipline, traceability of materials to certified mill sources, and calibration programs for all measurement equipment used on your parts. ITAR registration is legally required for shops handling technical data or hardware controlled under the United States Munitions List, which covers most defense electronics enclosures and structural components. Beyond those two, buyers should ask about NADCAP accreditation if special processes such as fluorescent penetrant inspection or heat treatment are performed in-house. ISO 9001 is the commercial baseline and is generally less rigorous than AS9100 for defense applications. ManufacturingBase lets buyers filter Nashua suppliers by certification, so you can narrow the qualified supplier list before sending RFQs.
Lead times on magnesium machined parts from Nashua shops depend heavily on alloy, part complexity, and finishing requirements. For AZ31B plate-machined parts with moderate complexity â say, a five-axis enclosure with several milled pockets and a few bored features â a Nashua shop with material in stock can typically deliver in three to five weeks from purchase order including a standard first-article inspection report. AZ91D die-cast-plus-machine parts take longer because the casting lead time from a domestic foundry adds four to eight weeks unless the buyer owns the casting tool and maintains a casting inventory. WE43 parts require material procurement of four to eight weeks before machining begins, so total lead times of ten to fourteen weeks are realistic for first-article hardware. Nashua shops serving defense programs are accustomed to schedule-driven procurement and will flag material lead time risks early in the quoting process. Providing a target delivery date on the RFQ, not just a quantity, helps shops align their scheduling and flag any constraints before award.
Last updated: July 2026
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