Top 20 Aerospace CNC Machining Factories: Who Is Best for Which Job?

Last updated: September 2026

The top aerospace CNC machining service factories include Zhenling Metal (the publisher of this guide), Protolabs and WayKen for prototypes and short runs, Owens Industries and McCormick Industries for small tight-tolerance parts, GKN Aerospace, PCC Aerostructures and Magellan Aerospace for production aerostructures, and Leistritz and AeroEdge for engine components. The right choice depends on part size, volume, material and required approvals.

Disclosure: This guide is published by Zhenling Metal. We list ourselves first because this is our website, not because we claim to be the market leader. The other 19 manufacturers are grouped by what they are best for, in no particular order within each group.

How We Selected These Aerospace CNC Machining Factories

Every factory on this list runs its own CNC machinery for parts used in aerospace applications: aerospace milling, CNC turning machines and Swiss-type lathes, 5-axis machining or electrical discharge machining. We left out machine-tool builders, cutting-tool makers, brokers, traders, B2B platforms, directories, distributors and shops only doing sheet metal, additive manufacturing or composites. To make this aerospace CNC machining service factories list, aerospace machined parts had to appear in each company’s own description, not only in its market segment.

The 20 factories span North America, Europe and Asia, from single-site precision machining companies that sell precision machining services to multi-plant groups that machine airframe and engine parts for leading aerospace companies in aerospace and defense; for groups, each card names the plants that do the machining. Several of the production groups also serve the aerospace and military industries, including F-35 work at Magellan and Asco. All companies mentioned offer machining of parts for the aerospace industry, from small aircraft and aerospace components to large structures. We cross-checked company websites against published certificates and, where a site was silent or conflicted, state or company registries and industry press in September 2026. If there’s a disagreement between a company’s website and a published supplier list, we give precedence to the company’s website. If a company doesn’t have publicly available information, we didn’t speculate on the information.

Each Best for label names the job that a company’s published processes, part sizes and certifications point to. Best for labeling isn’t a performance ranking of the companies. Certifications are reported at the level published by the company; therefore, a group-level statement is labeled as such, and a plant-level certificate names that plant.

Comparison of the Top Aerospace CNC Machining Companies

The table lines up the 20 factories on the facts buyers check first: where each company is based, when it was founded, the job it fits best, what it makes, its main advantage and its main purchasing limitation.

Prototype and Low-Volume Aerospace CNC Machining Services

These three suppliers take one-off custom aerospace parts and short runs from a drawing or CAD file, which suits prototype and bridge work before an aerospace project settles on a production source. All three sell custom precision CNC machining services, and they differ in how the work is priced and where it’s cut: Zhenling Metal has an engineer review each drawing in its own plant, Protolabs offers online CNC machining quotes and manufacturing services including CNC milling, molding and 3D printing from its own digital factories plus a partner network, and WayKen machines in-house in Shenzhen while drawing on partner capacity.

1. Zhenling Metal: Best for drawing-based aerospace CNC prototypes and low-volume precision parts requiring flexible 3-, 4-, and 5-axis machining

Headquarters: Jiashan, Zhejiang, China · Founded: machining to print since 2006 · Type: precision machine shop with its own plant

Main products / services: Made-to-drawing CNC turning, milling, grinding, boring, radial drilling and wire-cut EDM on 3-axis and 4-axis machining centers and imported 5-axis machining centers

Quality practice: Every batch starts only after the customer approves the first article; ISO 2768-m is the default general tolerance unless the drawing states otherwise; material certificates ship when the purchase order calls for them

Zhenling Metal is a drawing-led shop: a process engineer reads each drawing before pricing, and the quote comes back within 24-48 hours on business days. Its aerospace CNC machining page sets ±0.005 in as the quotation baseline for suitable features and reviews anything down to ±0.001 in feature by feature. No minimum order quantity applies, prototypes ship in 3-10 business days after drawing approval, and production runs are scheduled at 3-10 weeks. Buyers requiring supplier-specific aerospace approvals or certifications should note that it claims no aerospace certification, so programs that require one need another source.

Zhenling Metal website: zhenlingmetal.com

2. Protolabs: Best for fast-turn aerospace prototypes and bridge production with online quoting

Headquarters: Maple Plain, Minnesota, USA · Founded: 1999 · Type: digital manufacturer with its own factories plus a partner network

Main products / services: CNC machining, injection molding, 3D printing and sheet metal; high-speed 3-axis and 5-axis milling and turning with live tooling for aerospace parts

Certifications / notable work: Its certification table lists AS9100D for CNC machining in Brooklyn Park, Minnesota, Nashua, New Hampshire and Telford, UK; its aerospace CNC page also lists ISO 9001:2015 and ITAR

Protolabs runs its own digital factories and quotes CNC parts online with design-for-manufacturing feedback, which suits teams iterating on an aerospace design. The company reports 95%+ on-time delivery of production-grade components in days. Orders that need tighter tolerances, volume pricing or anodizing are routed to Protolabs Network, its partner-shop network, so the shop that machines a part depends on the service chosen.

Protolabs website: www.protolabs.com

3. WayKen: Best for cost-sensitive aerospace prototypes and small batches machined in China

Headquarters: Shenzhen, China · Founded: Not publicly disclosed · Type: prototyping company and rapid manufacturer with in-house machining

Main products / services: CNC machining, 3D printing, vacuum casting, rapid tooling and low-volume injection molding

Certifications / notable work: ISO 9001:2015, with IATF 16949 and ISO 14001 certificates linked on its quality page; inspection lab with a ZEISS CAPTUM CMM

WayKen machines 3-, 4- and 5-axis parts on Haas mills in its own facility and also draws on partner capacity across China. One published aerospace case covers forged aluminum engine impellers held to 0.02 mm concentricity on the central shaft hole, with the work run to AS9102 first article inspection. Its FAQ lists machined parts up to 1200 x 800 x 600 mm and sets no minimum order quantity. It publishes ISO 9001:2015 rather than AS9100, so programs that require an AS9100-certified supplier need another source.

WayKen website: www.waykenrm.com

Precision Aerospace Machining Specialists in North America

These five aerospace machine shops are smaller than the groups further down, and each has a clear specialty: ultra-tight-tolerance 5-axis CNC machining and electrical discharge machining (EDM), Swiss machining and Swiss CNC turning, landing gear parts, or robotic machining cells. Their aerospace machining capabilities differ more than their size suggests. Three of them publish tolerances down to ±0.0001 in, the precision aerospace machining tier that precision aerospace components such as trunnions, pins and shafts call for, along with precision machined parts such as hinges and actuator parts. Three hold AS9100, while Ardel Engineering and McCormick Industries work under ISO 9001:2015.

4. Owens Industries: Best for complex, ultra-tight-tolerance 5-axis and EDM parts from a US AS9100 shop

Headquarters: Oak Creek, Wisconsin, USA · Founded: 1944 · Type: precision CNC machine shop

Main products / services: 5-axis machining, wire and sinker EDM, super-precision lathe turning, mill-turn, micromachining and metal 3D printing

Certifications / notable work: AS9100 and ISO 9001:2015, plus ITAR registration, according to its website; machined a bicep assembly for the NASA and GM Robonaut robot arm, after which NASA commissioned two more

Owens machines 5-axis parts up to 28″ x 24″ x 15″ and holds precision tolerances of .0001″ on 5-axis work. The shop runs HERMLE 5-axis centers, DMG MORI turning and Agie Charmilles EDM systems, with Zeiss equipment for inspection, a mix that provides precision aerospace machining for small, feature-dense parts. Its published standard lead times are 10 to 12 weeks, so it isn’t a quick-turn prototype source.

Owens Industries website: www.owensind.com

5. Ardel Engineering: Best for milled and Swiss-turned aerospace components with AS9102 first-article reports

Headquarters: New Hope, Minnesota, USA · Founded: 1967 · Type: precision machining company

Main products / services: CNC vertical and horizontal milling, Swiss screw machining and turning, wire EDM, inspection and value-added services

Certifications / notable work: ISO 9001:2015; first article inspection reports in AS9102 format; Zeiss CMM and a vision system that log SPC and CPK data

Ardel Engineering was incorporated in Minnesota in 1967 as Ardel Products Co. and says it has partnered with aerospace companies since 1963. Ardel machines 2000-, 6000- and 7000-series aluminum, titanium, stainless steel and high-stress alloys in a climate-controlled shop and names Lockheed Martin, Boeing and Vickers among the aircraft companies it has worked with. Its website lists ISO 9001:2015 rather than AS9100, which rules it out where flight hardware must come from an AS9100-certified supplier.

Ardel Engineering website: www.ardelengineering.com

6. McCormick Industries: Best for small Swiss-turned aerospace and defense parts up to 1.25 in diameter

Headquarters: Appleton, Wisconsin, USA · Founded: 1996 · Type: Swiss-type precision machining shop

Main products / services: Swiss precision turning, CNC turning and CNC milling

Certifications / notable work: ISO 9001:2015; custom Swiss-turned trunnions made on a Cincom K-16E machining center, one of its custom projects for large military and aerospace contractors

McCormick specializes in small, complex parts for aerospace, defense, industrial and medical customers. Its aerospace page lists Swiss-turned diameters up to 1.25 in, CNC-turned parts up to 18.00 in long by 1.625 in in diameter, and tolerances as tight as ±0.0001 in on diameter and length, with titanium and exotic alloys on the material list. Because Swiss turning tops out at 1.25 in diameter, it fits pins, shafts and fittings rather than large structural components.

McCormick Industries website: mccormickind.com

7. Machine Specialties, Inc.: Best for landing gear and flight-control parts in 300M steel with in-house finishing

Headquarters: Whitsett, North Carolina, USA · Founded: 1969 · Type: contract machining and metal finishing specialist

Main products / services: Landing-gear-type aerospace parts such as collar assemblies, drag braces, struts and trunnion struts, with in-house chemical processing and NDT

Certifications / notable work: AS9100D and ISO 9001:2015 from LRQA for its single Whitsett site, with a scope covering landing gear, flight control, hydraulic actuation and structural aerospace components; Nadcap-approved for chemical processing and non-destructive testing

Machine Specialties has made precision parts since 1969. Its multi-pallet 3- to 5-axis machining centers take parts up to 50 x 24 x 30 in, Swiss-type lathes run to 1.25 in O.D. and chucking lathes to 18 in O.D., and the shop treats ±0.0001 in as a normal tolerance. It works 300M steel, the high-strength alloy used in landing gear, and quotes standard lead times of 4-8 weeks. It prices most competitively on 15 to 10,000-piece lots; smaller lots make sense mainly ahead of a production run or for repeat orders.

Machine Specialties website: machspec.com

8. Avior Integrated Products: Best for low-volume aluminum and titanium structural details from robotic machining cells

Headquarters: Laval, Quebec, Canada · Founded: 2002 · Type: Tier II integrator of aircraft structures and mechanical assemblies

Main products / services: Machined flight-critical rotary components, complex structural details, hinges, beams, tailboom details, ribs and bell cranks, plus assemblies

Certifications / notable work: AS9100D certified by BSI for precision machining, composite fabrication and assembly; in-house special processes such as welding and heat treatment are Nadcap and customer certified

Avior’s Montreal unit in Saint-Laurent runs robotic cells that load 5-axis and 3-axis machines, next to a Mazak Nexus 5000 flexible manufacturing system with 24 pallets, and the cells can run unattended for up to 4 days on three shifts. That automation keeps small batches economical, and the machined details also feed Avior’s own assemblies for customers it names, including Bell and Bombardier. Avior machines aluminum, stainless steel and titanium and works to tolerances below ±0.001 in. The company is a partnership of its employees, Fonds de solidarité FTQ and Hay Island. Its stated machining envelope tops out at 40 x 60 in, with mid-size parts around 24 in as the core.

Avior Integrated Products website: www.avior.ca

Leading Aerospace Manufacturers for Aerostructures and Engine Components

These nine aerospace manufacturers and program suppliers, which support the aerospace and defense industries at production scale with components for the aerospace industry, sit one or two tiers below airframe and engine makers in the manufacturing of aircraft and spacecraft. Their aerospace parts manufacturing covers large structural parts and engine parts for aircraft and aerospace systems, usually built to the customer’s print. CNC manufacturing of aircraft structures at this scale runs on long-bed and multi-spindle machines. Aerospace manufacturing at this scale is organized plant by plant, so each card names the sites that do the machining.

9. GKN Aerospace: Best for machined engine fan cases and large wing skins from tier-one plants

Headquarters: Birmingham, England, UK · Founded: roots in 1759 · Type: tier one aerospace supplier, part of Melrose PLC

Main products / services: Airframe and engine structures, landing gear, electrical interconnection systems, transparencies and aftermarket services

Certifications / notable work: Its Wellington, Kansas machining site, GKN Aerospace Precision Machining, Inc., is registered by Intertek to AS9100:D and ISO 9001:2015 through March 2029; its supplier portal credits that site with the Boeing 787 section 41 floor module

GKN traces its roots to the Dowlais Ironworks of 1759 and has been part of Melrose PLC since 2018; the group reports 16,000 employees across 32 manufacturing locations in 12 countries. Machining is one process among many there, so the useful entry points are named sites: Wellington, Kansas machines metallic structures including large wing skins and control surfaces, Newington, Connecticut machines large components such as fan cases for aircraft engines, and Kongsberg, Norway makes complex components for jet engines and gas turbines. Its stated customers are aircraft and engine primes and other tier one suppliers, so small one-off machining orders sit outside its market.

GKN Aerospace website: www.gknaerospace.com

10. PCC Aerostructures: Best for build-to-print large structural machinings such as spars, frames and bulkheads

Headquarters: Woodinville, Washington, USA · Founded: Not publicly disclosed · Type: division of Precision Castparts Corp. (PCC Airframe Products segment)

Main products / services: Machined ribs and spars, major frames and bulkheads, beams, braces, intercostals, stringers, struts and webs, plus kits and assemblies

Certifications / notable work: Certificates are posted per site; its Spanish Fork machining site lists ISO 9001:2015 and AS9100D

PCC Aerostructures machines 3-, 4- and 5-axis prismatic and long-bed parts up to 40 meters long in aluminum, titanium and other aerospace metals across almost three dozen locations. The ADI plant in Valencia, California, runs four 5-axis, 5-spindle gantries on a 308 ft bed, and the Dorval site machines spars, skins and bulkheads on beds up to 1,200 x 120 x 28 in. It positions itself as a Tier II build-to-print supplier, so it fits programs with released customer drawings rather than design-stage prototypes.

PCC Aerostructures website: www.pccaero.com

11. Magellan Aerospace: Best for long aluminum wing spars and ribs for high-volume OEM programs

Headquarters: Mississauga, Ontario, Canada · Founded: Not publicly disclosed · Type: integrated aerospace supplier listed on the Toronto Stock Exchange (TSX: MAL)

Main products / services: Aeroengine and aerostructure assemblies and components, specialty products, and engine and component repair and overhaul

Certifications / notable work: AS9100 Rev-D certified CNC machining plant in Tumkur, India; makes VaneBoxes and transition ducts for the F-35B, with assembly machining held under 0.001 in, according to its website

The company’s components page describes wing spars 10 to 22 meters long machined on high-speed long-bed 5-axis mills, mostly in aluminum and aluminum-lithium. According to its locations page, the UK operation in Wrexham runs high-speed long-bed 3-, 4- and 5-axis machining for spars, wing ribs and skin reinforcings supplied to Airbus, while the Blackpool site handles hard metal machining of titanium and stainless steel parts up to 1 m³ from forgings and plate. Hard-metal milling is listed only up to 1.25 m, so very long titanium parts need another source.

Magellan Aerospace website: magellan.aero

12. Figeac Aero: Best for large aluminum and hard-metal airframe parts, including spars over 20 m long

Headquarters: Figeac, France · Founded: 1989 · Type: aerospace subcontractor group listed on Euronext Paris

Main products / services: Machined aluminum structural parts, hard-metal structural parts in titanium, Inconel and steel, engine and precision parts, plus sheet-metal parts through its SN Auvergne Aéronautique subsidiary

Certifications / notable work: EN 9100, ISO 9001 and ISO 14001 at group level, with Nadcap listed for subsidiaries such as Casablanca Aéronautique (heat treating, NDT, chemical processing); selected by Airbus in 2010 as one of its top-20 global suppliers for its component family

Figeac Aero was founded in Figeac in 1989 and runs over 300 CNC machines, from 3-, 4- and 5-axis machining centers to vertical lathes and profile machining centers, making parts from 26 mm fittings to aircraft spars over 20 m long. Its production reaches beyond France: it started best-cost production in Tunisia in 2011 and bought an industrial site in Kansas in 2014 for Figeac Aéro North America. It works build-to-print, machining to customer specifications, so buyers need complete drawings and specifications before a quote.

Figeac Aero website: www.figeac-aero.com

13. Mecachrome: Best for aero-engine revolving parts and titanium or Inconel machining at series scale

Headquarters: Blagnac, France · Founded: 1937 (in Colombes, near Paris) · Type: French machining group (MECA DEV and its subsidiaries)

Main products / services: Machined parts in light alloys and hard metals, known for revolving parts for aircraft engines, plus sheet-metal work

Certifications / notable work: EN 9100 certificates for sites including Mecachrome Toulouse and HITIM, an AS9100 certificate for its Mirabel, Canada site (the posted file is labelled 2018–2021), and Nadcap for NDT, chemical processing, non-conventional machining and welding

Mecachrome runs more than 400 machines, including 3-, 4- and 5-axis centers, multi-spindle gantries and mill-turn machines, with machining capacity up to 23 meters in aluminum, aluminum-lithium, stainless steel, titanium and Inconel. It jointly developed Safran LEAP turbine blades in 2015, its MKAD joint venture with Aubert & Duval machines large titanium parts for the A350, and the 2021 Hitim acquisition added landing gear axles, engine drive shafts and HVOF coating. Mecachrome’s plants are in France, Portugal, Morocco and Tunisia, with Mirabel, Quebec, as the forward base for North American customers, so US programs are supplied from Canada or from overseas.

Mecachrome website: www.mecachrome.com

14. LISI Aerospace: Best for forged-then-machined engine blades, disks and structural fittings from one supplier

Headquarters: Paris, France · Founded: group roots in 1777 · Type: aerospace division of the LISI global industrial group

Main products / services: Engine components (fan and compressor blades, vanes, disks, blisks, impellers, gears, rings, housings), structural components such as pylon fittings and highly loaded nacelle parts, and aerospace fasteners

Certifications / notable work: The company states that all its manufacturing sites hold aerospace quality management system certification and that some special processes hold NADCAP; certificate files are posted for LISI AEROSPACE Fasteners (EN 9100, EN 9120)

LISI Aerospace makes engine components along a full chain from forging to machining and finishing, in aluminum, titanium and nickel-based alloys, and runs production lines for batches from 10 to 250,000 parts, from prototypes to spare parts. It says it ranks no. 3 worldwide in aerospace fasteners, reported €838M revenue for 2023, and built its structural-components business through the CREUZET (2011) and MANOIR AEROSPACE (2014) acquisitions. Five of the seven structural-component plants on its manufacturing page are in France, so most structural work ships from Europe.

LISI Aerospace website: www.lisi-aerospace.com

15. Asco Industries: Best for high-lift device parts and large titanium or aluminum aerostructure machining

Headquarters: Zaventem, Belgium · Founded: 1954 · Type: aerostructural parts manufacturer, part of Montana Aerospace since 2022

Main products / services: High-precision structural parts and sub-assemblies for wing, engine, fuselage and landing gear, including high lift devices, attachments and profiles in titanium, high-strength steel, aluminum and composites

Certifications / notable work: AS/EN 9100 at all sites; Belgian CAA Part 21G approval; Nadcap for heat treatment, NDT and chemical processing at Asco Belgium and for surface enhancement and coatings at Asco USA; F-35 horizontal tail parts through BeLightning, created in 2021

Asco began in 1954 as a small workshop in Brussels, entered aerospace in 1979 through Belairbus, and had around 1,100 employees across four plants when Montana Aerospace closed its purchase on 31 March 2022. The plants split the work: Zaventem is the head office and main plant, Gedern in Germany does high-speed cutting of large aluminum structural parts and extruded profiles, Delta near Vancouver handles very large aluminum and hard-metal machining, and Stillwater, Oklahoma, completes the set. Nadcap approvals are listed only for the Belgian and US plants, while the German and Canadian sites list AS/EN 9100 only.

Asco Industries website: www.asco.be

16. Gardner Aerospace: Best for airframe detail parts needing machining, stretch-forming and assembly from one group

Headquarters: Derby, England, UK · Founded: Not publicly disclosed · Type: self-described independent manufacturer of aerospace metallic parts

Main products / services: Milling and turning, fabrication including stretch-forming and chemical milling at Derby, welding, complex assembly and speed-shop work for aerospace metallic parts

Certifications / notable work: EASA Part-21G and Part-145, AS9100/EN9100, ISO 14001, ISO 45001, ISO 50001 and NADCAP, as listed on its website; it cites long-standing supply to Airbus, Boeing and Rolls-Royce

Gardner runs nine global sites: Basildon, Consett and Derby in the UK, Mazères in France, Mielec, Nowa Deba and Tczew in Poland, Bengaluru in India and Chengdu in China. Across them it lists over 200 spindles, 3-, 4- and 5-axis milling and turning, and parts up to 30 m long. In 2016 China’s Shaanxi Ligeance Mineral Resources agreed to buy Gardner for £326m, according to the UK industry association ADS. Long-bed machining for long parts is listed only at Consett, so very long parts go to that one plant.

Gardner Aerospace website: gardner-aerospace.com

17. Leistritz Turbine Technology: Best for forged and machined compressor airfoils, discs and blisks for engine programs

Headquarters: Remscheid, Germany · Founded: 1905 (in Nuremberg) · Type: aircraft engine component manufacturer

Main products / services: Compressor airfoils (blades and vanes) in high-temperature steel, titanium and nickel alloys; discs, rings, shafts, cones and blisks; structural parts such as annulus fillers and bearing supports

Certifications / notable work: EN 9100:2018 for its production sites in Germany, Thailand and Croatia; Nadcap certificates posted for its Nuremberg, Remscheid and Thailand sites

Leistritz forges and machines engine parts in its own plants and lists rotating parts up to 500 kg and 1,200 mm in diameter. Electrochemical machining has been in series production there since 1970 and PECM (precise electrochemical machining) since 2018, and its history timeline records 2010 as the year it became sole approved supplier of forged titanium aluminide (TiAl) components. Production sits in Germany, Croatia and Thailand with no North American plant named, so US buyers are supplied from overseas.

Leistritz Turbine Technology website: turbines.leistritz.com

Aerospace Machining Companies in Asia

These three Asian factories machine critical aerospace parts beyond prototypes for demanding aerospace programs in the aerospace sector: an Indian contract manufacturer with over 200 aerospace CNC machines, a Kyoto supplier that pairs machining with special processes, and a Japanese maker with a unique aerospace specialty, titanium aluminide turbine blades for the LEAP engine. The two Chinese entries, Zhenling Metal and WayKen, appear in the prototype group above.

18. Aequs: Best for contract machining of landing-gear, actuation and structural parts at scale in India

Headquarters: Belagavi, Karnataka, India · Founded: 2006 (as QuEST Global Manufacturing; renamed Aequs in 2014) · Type: contract manufacturing company with vertically integrated aerospace machining

Main products / services: Machined actuation, structural, landing systems, engine and interior components from billet, forgings and castings; landing-gear assemblies and large engine casings at Cholet, France

Certifications / notable work: EN 9100:2018, technically equivalent to AS9100D, from Bureau Veritas for its Belagavi sites; its Paris, Texas plant is registered for ITAR parts; received the first Casing Industrialization Award from Safran Helicopter Engines in 2020

Aequs lists over 200 CNC machines across its aerospace segment as of March 2025, from 3-, 4- and 5-axis centers to mill-turn and vertical turning lathes; its main site is the Belagavi special economic zone, with further plants in Cholet, France and Paris, Texas. It opened a dedicated 100,000 sq ft machining facility for Airbus in 2015, and in 2019 it became the first in India to build A321 over-wing exit door assemblies. Forging, heat treatment and surface treatment come through joint ventures rather than wholly owned units. Most volume ships from India, so lead times include ocean or air freight.

Aequs website: www.aequs.com

19. Asahi Kinzoku Kogyo: Best for machined parts that also need plating, anodizing, peening and NDT from one supplier

Headquarters: Kyoto, Japan · Founded: 1948 · Type: aerospace parts supplier built on special processes, trading as Asahi Aero

Main products / services: Structural, moving, interior and engine parts for commercial, defense and space programs; special-process services; sub-assemblies

Certifications / notable work: Nadcap, according to the company; JISQ9100 (AS9100) since 2004; special-process approvals from Boeing (1977), Honeywell, Pratt & Whitney and Sikorsky

Asahi began as an electroplating company, started machining aerospace parts in 1982 and describes itself as a one stop shop for process planning, machining, surface treatment, painting and assembly. Its process list covers penetrant and magnetic-particle inspection, shot peening, hard and chromic anodizing, zinc-nickel and cadmium plating and HVOF spray, and its machine list includes four Makino 5-axis centers. Programs named on its site include the B787, A350 and the PW1100G engine. Its Long Beach, California site is listed as temporarily closed, so supply comes from Japan and Malaysia.

Asahi Kinzoku Kogyo website: www.akg.co.jp

20. AeroEdge: Best for series machining of titanium aluminide turbine blades with in-house NDT

Headquarters: Ashikaga, Tochigi, Japan · Founded: 2015 · Type: aero-engine parts manufacturer, listed in Tokyo since 2023

Main products / services: Titanium aluminide (TiAl) turbine blades for the LEAP engine under a direct contract with Safran Aircraft Engines

Certifications / notable work: JISQ9100 and ISO 9001:2015, JIS Q 14001, Nadcap for non-destructive testing, and Safran approvals for penetrant and digital X-ray inspection

AeroEdge spun out of Kikuchi Gear’s aerospace division and machines blades on high-rigidity machines developed with Mitsui Seiki, then inspects them in-house with YXLON digital X-ray and Wenzel non-contact 3D measurement. It had delivered a cumulative 100,000 turbine blades to Safran Aircraft Engines by April 2019 and received Safran’s Supplier Performance Award in August 2022. Its certificates cover turbine blades for aircraft engines at the Ashikaga plant, so other part families fall outside the certified scope.

AeroEdge website: aeroedge.co.jp

Compare Aerospace Parts to Factories: The Buying-Scenario Map

Use the Buying-Scenario Map to move from the aerospace part you have to two to three names for an RFQ. The following info is from the company cards above.

How to Choose an Aerospace CNC Machining Manufacturer

An ideal aerospace supplier is the one whose machining capabilities, quality system and paperwork match the part, as opposed to the supplier with the longest machining equipment list. Aerospace engineers and buyers sourcing machining for aerospace work will evaluate these factors prior to award of the contract and send them as questions with the RFQ. These considerations are applicable across the product spectrum of the aerospace industry, from airframe brackets to engine parts, and form part of the due diligence before award. For additional information, refer to our aerospace CNC machining guide.

1. Confirm the quality-system requirements before the RFQ

Decide which quality system the order needs before you ask for prices, because not every aerospace part carries the same requirement. AS9100 is the aerospace quality management standard built on ISO 9001, and suppliers certified to the 9100 series are listed in the IAQG OASIS database, where you can check the certificate holder, site and scope. Special processes such as heat treating, non-destructive testing, welding and chemical processing are often controlled through Nadcap, which runs 24 critical-process accreditation programs. Add any customer-specific approvals and the industry standards named on the drawing, and if the part or drawing is export-controlled, confirm the supplier may receive it; for US defense articles, US manufacturers and exporters register with the State Department’s DDTC.

“Online Aerospace Supplier Information System® (OASIS) is an online resource containing a list of suppliers certified/registered under the IAQG rules to comply with the aerospace quality management system requirements (9100 series).”

2. Separate general tolerances from flight-critical dimensions

Aerospace machining involves two kinds of tolerance, and precision matters in aerospace only on the features that carry load, seal or locate, so mark those and leave the rest on the general tolerance class. Based on Zhenling Metal’s machining experience, a drawing that names no general tolerance class gets one default in one shop and a different default in another, and the gap only shows up at incoming inspection. Call out GD&T per ASME Y14.5 on datums, true position, profile, concentricity, flatness and hole locations, and ask how the supplier will measure each critical-to-function feature. Tight tolerances on every dimension add machine and inspection time without improving the part.

3. Check 5-axis capability beyond the machine count

Don’t stop at asking whether a shop has a 5-axis CNC machine. A list of state-of-the-art CNC centers proves little on its own, because advanced machining of complex aerospace parts depends on how the shop applies that CNC technology. Ask for the usable work envelope (Owens Industries, for example, publishes 28 x 24 x 15 in for 5-axis parts, while Magellan Aerospace machines spars up to 22 m on long-bed mills), spindle speed, rotary-axis accuracy, in-process probing, tool magazine capacity and how the post-processor was validated. A one-setup strategy cuts datum transfers, but even an advanced CNC setup only helps when the fixture reaches every feature. Zhenling Metal settles which route a part takes, including 5-axis CNC machining, at drawing review rather than after the first article.

4. Verify material traceability

Common materials for aerospace CNC machining include 2024, 6061 and 7075 aluminum alloys, with 7075 widely used in aerospace structures, titanium such as Ti-6Al-4V, stainless steels, and nickel alloys such as Inconel 718 used in the aerospace engine hot section. Every one of these common aerospace alloys should trace back to a mill heat or lot. Ask for the mill certificate for the stock your parts will be cut from, the heat or lot number that ties that certificate to the components used in your assembly, how material substitutions are approved, and whether a certificate of conformity ships with each lot. For titanium CNC machining in particular, check that the specification and condition on the certificate match the drawing.

5. Define inspection deliverables before quoting

Aerospace machining uses first article inspection to prove that the process, not just one part, meets the drawing. Agree the inspection package before price: a dimensional or CMM report, first article inspection to AS9102 (revision C, issued in 2023), a ballooned drawing, material certificates, a certificate of conformity and surface-finish records where a finish is called out on the machined parts. Documents added after the order are priced after the order, so list them in the RFQ and compare quotes that include the same package.

6. Separate machining from special processes

Aerospace machining relies on outside processors for many finishing steps, and parts that rely on CNC machining for their geometry still often need anodizing or heat treatment. Ask which steps run inside the factory and which go out: anodizing, passivation, plating, heat treatment, shot peening, NDT, painting and grinding. Each outside step adds days and a transport leg, and many aerospace programs require the processor itself to hold an approval such as Nadcap for that process. Some factories in this guide keep these steps in-house, such as Machine Specialties with Nadcap chemical processing and NDT, and Asahi Kinzoku Kogyo with plating, anodizing and peening next to its machining.

7. Calculate the real landed cost

Compare quotes for machined parts for the aerospace supply chain on landed cost, not the machining unit price. The total includes programming, fixtures, inspection and first article reports, material certification, special processing, packaging, freight, import duties, replacement of rejected parts and any expedited production. Confirm which legal entity signs the order and which plant cuts the metal: groups that supply components for the aerospace field, such as PCC Aerostructures and GKN Aerospace, run dozens of sites, and ownership changes such as Montana Aerospace’s 2022 purchase of Asco can move a plant into a different group.

8. Plan the prototype-to-production transfer

It’s common to use CNC machining for prototypes, followed by forging or casting with finish machining for the production run, or to move the production work to a separate supplier. If a company performs prototype CNC machining and doesn’t secure the production CNC machining, plan the handover of the CNC machining processes involved, from process route and fixtures to inspection method, material source and drawing revision control, and expect a new first article inspection upon the start of production. It’s good practice to budget for first article inspection when a supplier or facility changes.

FAQs About Aerospace CNC Machining Factories

Which is the best aerospace CNC machining manufacturer for prototypes?

There’s no single best factory for aerospace prototypes; when comparing aerospace machining services, the right one depends on quantity, tolerance, material, inspection package and certification requirements. For drawing-based one-offs and short runs, prototype-focused suppliers such as Zhenling Metal, Protolabs and WayKen quote from a drawing or CAD file, and Zhenling describes its rapid CNC prototyping route on its site. If the part must come from an AS9100-certified process, shortlist certified shops and state the approvals in the RFQ.

Which is the best aerospace CNC machining manufacturer for 5-axis parts?

5-axis machining is ideal for aerospace parts with compound angles and deep pockets, so start with factories that can prove real 5-axis capacity: usable work envelope, rotary-axis capability, in-process probing, inspection equipment and the quality system your program requires. In this guide, Owens Industries publishes its 5-axis envelope and tolerances, Avior Integrated Products runs 5-axis robotic cells, and Aequs, Figeac Aero and Mecachrome run 5-axis centers at production scale.

Who is the largest aerospace CNC machining manufacturer in the world?

No public source ranks aerospace CNC machining on a comparable basis, so naming one largest company would be a guess. Groups such as GKN Aerospace report sales that mix machining with assembly, while contract machining companies publish capacity instead of revenue.

Are Chinese aerospace CNC machining manufacturers reliable?

Reliability depends on the factory: country of origin isn’t enough to qualify a supplier. Check what equipment the factory has, the quality system, scopes of certifications, material and process traceability, inspection, drawings and revisions, export experience, aerospace approvals, and first article reports. Of the two Chinese entries here, WayKen publishes ISO 9001:2015 rather than AS9100, and Zhenling Metal claims no aerospace certificate. The same checks apply to CNC machined parts for the aerospace industry wherever the supplier is based.

How much does aerospace CNC machining cost?

There’s no range for typical or average prices for aerospace CNC machining services because prices are based on drawing and process specifications. Factors that affect cost include material, machine time, setups, tolerances and 5-axis machining, inspection and first article reports, special processes and quantity. CNC machining is widely used for prototyping because tooling isn’t required.

What is the difference between an aerospace CNC machining manufacturer and a supplier?

A manufacturer or machine shop cuts parts in its own facility, which matters in machining for the aerospace industry because approvals are site-specific. A supplier can be an intermediary, broker, or sourcing company. Therefore, to evaluate a supplier, you must identify where the machining will occur.

Conclusion: Match the Factory to the Aerospace Part, Not the Brand Name

Different aerospace CNC machining service factories fit different jobs: production volume, part size, material, tolerance, certification requirements and your geographic sourcing strategy decide the shortlist far more than company size. For example, a program for a titanium aluminide blade, a 20 meter wing spar, and a batch of prototype brackets would require different kinds of factories to produce the parts. For buyers comparing machining solutions for aerospace parts, the best next step is to pick two or three names from the Buying-Scenario Map, send each the same drawing package, and compare quotes that cover the same inspection and documentation scope.

If your part is a drawing-based prototype or a low-volume precision component, you can send the drawing to Zhenling Metal for an engineering review and a CNC machining quotation, or first browse the industries we machine for and the materials we machine.