Precision matters in aerospace. A component off by two ten-thousandths doesn't just fail inspection, it can ground a program. Steelcrest Precision machines mission-critical aerospace and defense components to tolerances as tight as ±0.0002", CMM-verified and documented from first article forward.

Bring us the parts other shops turn down. From prototype to production, 100+ CNC machines — 5-axis, multi-tasking, Swiss, EDM, and precision grinding — deliver the accuracy your program demands on the schedule it can't afford to miss.

Aerospace CNC machining is the computer-controlled cutting of high-strength metals into flight-critical and defense components — parts where dimensional accuracy, material traceability, and documented inspection aren't preferences but requirements. That's where Steelcrest Precision comes in. We machine to tolerances tighter than general machining demands, with certified materials, multi-axis equipment for complex geometries, and a quality system that records proof at every step. The part matters; the paperwork proving the part matters just as much.

Our machinists and engineers take on aerospace work that pushes past standard machining. Whether the part calls for 5-axis machining, multi-tasking turn-mill, swiss turning, wire EDM, or precision grinding, Steelcrest Precision delivers components held to exacting tolerances and verified before they ship.

The prints that make other shops hesitate are usually the ones we're built for. We work directly with your engineering team from drawing review forward, machining high-accuracy parts in demanding materials backed by four decades of toolroom experience and a floor of more than 100 CNC machines.

Stainless Steel

Corrosion-resistant grades for aerospace hardware, from structural 304 to precipitation-hardening 17-4 PH. All grades machined regularly, with material certifications delivered with the parts.

Grade	Typical Application
304	Housing, brackets, general hardware
316	Corrosion-critical components
17-4 PH	High-strength precision shafts and parts
410	Valve and wear components
420	Wear components, precision-ground pins
440C	Bearing races and high-hardness wear details

Precipitation-Hardening Stainless

High strength with corrosion resistance, and far less distortion through heat treat than a through-hardening grade. That combination is why aerospace prints reach for it on precision shafts and structural details.

Grade	Typical Application
17-4 PH	High-strength precision shafts and structural parts
15-5 PH	Cleaner-microstructure alternative for critical details

Alloy Steels

High-strength structural, drive, and landing gear components. Supplied annealed for machining and heat treated after, or pre-hardened where the finished condition comes from the mill.

Grade	Typical Application
4130	Tubular and welded structural compo
4140	Shafts, fittings, high-load details
4340	High-load shafts and pins
8630	Weldable high-strength structural components
300M	Landing gear and ultra-high-strength components

Case-Hardening Steels

Carburizing grades that finish with a hard wear surface over a tough core, which is exactly what gear teeth and bearing surfaces need to survive flight cycles.

Grade	Typical Application
8620	Gears, splines, and bushings
9310	Transmission gears and high-load drive components

Nickel Alloys

Strength and oxidation resistance at temperatures that take the strength out of steel, for hot section, exhaust, and high-temperature fastening hardware. Machined with the rigidity, feeds, and tooling nickel superalloys demand.

Grade	Typical Application
INCONEL 625	Exhaust, ducting, and corrosion-critical components
INCONEL 718	High-temperature structural and rotating components
INCONEL 600	High-temperature and corrosion service parts
INCONEL X-750	Springs, fasteners, high-temperature hardware
Nickel 200 and 201	Chemical and process handling components

Titanium

Strength-to-weight where every pound is designed out, plus corrosion resistance that outlasts the airframe. Machined with the rigidity, feeds, and coolant strategy titanium requires rather than treated as another alloy steel.

Grade	Typical Application
Grade 1 through 4, commercially pure	Corrosion-resistant fittings and ducting components
Ti-6Al-4V (Grade 5)	Structural fittings, brackets, flight hardware
Ti-6Al-2Sn-4Zr-2Mo	High-temperature structural components

Aluminum

The volume material of airframe structure, chosen for strength-to-weight, machinability, and a surface that comes off the machine ready for treatment.

Grade	Typical Application
6061	Brackets, housings, mounting structure
6063	Extruded rail, trim, and framing components
7075	High-strength structural fittings and machines details
2024	Fatigue-critical structural components

Composites

Lightweight structure and electrically insulating detail, machined with the tooling geometry and dust extraction composite work requires.

Grade	Typical Application
CFRP	Lightweight structural panels and components
Carbon fiber/epoxy laminate	Structural panels, plates, stiffeners
Linen and paper phenolic	Insulating, bearing, and wear components

High-Performance Plastics

PEEK where a polymer has to hold up to temperature, chemicals, and load at the same time, in the places metal is heavier than the design can afford.

Grade	Typical Application
Unfilled PEEK	Bushings, seals, insulating components
Glass-filled PEEK	Dimensionally stable structural details
Carbon-filled PEEK	Wear components and low-friction bearings

✓ 5-Axis Machining for Complex Geometries: Six Haas UMC-750 machining centers handle compound angles, angled holes, and multi-sided features in a single setup — eliminating the stacked error of repositioning — with capacity to 30" × 20" × 20" and tolerances of ±0.001".

✓ Precision Turning & Mill-Turn to ±0.0002": Shafts, sleeves, and fittings with tight concentricity and runout requirements run on our Mazak turning fleet — up to 26" diameter × 160" long — while INTEGREX and HYPER QUADREX mill-turn platforms finish complex parts in one setup.

✓ Swiss Turning for Small Precision Hardware: Star and Citizen Swiss lathes machine small-diameter, feature-dense components — long, slender geometries held stable to ±0.0002" with the repeatability flight hardware demands.

✓ EDM & Precision Grinding for the Tightest Callouts: Wire and RAM EDM cut hardened materials without cutting pressure (to 31" × 28" × 11"), and precision grinding delivers final sizes to ±0.0002" with finishes down to 8 Ra.

CNC Machining for the Aerospace Industry

The CNC experts at Steelcrest Precision manufactures tight-tolerance components used throughout aerospace and defense applications, including flight hardware, sensor mounting, actuation systems, airframe assemblies, and ground support equipment. Every component is produced to exact specifications using high-performance materials such as stainless steel, alloy steel, aluminum, and Inconel.

Our broad in-house capabilities allow us to support complex aerospace components from low-volume builds through repeat production. With 5-axis milling, multi-tasking and Swiss turning, wire EDM, and precision grinding. Steelcrest delivers precise geometries, critical features, and repeatable quality, backed by material traceability, documented inspection, and first article reporting.

Part	Application	Process Used	Material	Critical Feature
Ribs	Cross sectional members that maintain shape of wing	Milling	7075 Aluminum	Thin wall (.04) flatness withing .010 over 80"
Anti-Rotation Washers	Special washers that prevent nuts, bolts, and components from loosening under vibration, shock, or thermal cycling	Milling	17-4 H900	Thin wall (.06) complex geometry
Lift Mechanism	Key components for take off and landing	5-Axis Machining	17-4 SS	Complex geometry, tight true positional tolerances (.001)
CRN Rail Splice	Specialized interconnect assembly used to join or terminate electrical wires in a Current Return Network	5-Axis Machining	7075 Aluminum	Critical bore dimensions (+/-.001)
Fitting Assemblies	Precision engineered connectors that join hoses, tubes, and other fluid lines to ensure leak free and vibration-resistant connections	5-Axis Machining	7075 Aluminum	Complex geometry and profile tolerances of +/- .001

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Aerospace & Defense

Precision Manufacturing for Mission-Critical Standards

What is Aerospace CNC Machining?

Steelcrests' Aerospace Expertise

Is Your Aerospace Project Ready for Takeoff?

Materials We Machine for Aerospace Parts