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Guide](/materials/inconel-cnc-machining-guide) ![Olympus Machining LLC logo — precision CNC machining shop in Hanover, Pennsylvania](/assets/olympus-logo-DbWcTX06.webp) HomeAboutServices[Blog](/blog)Contact[Careers](/careers)[(717) 634-5094 ](tel:+17176345094)[Login](/auth)Get Quote [Back to Materials](/materials-machined) # Inconel CNC Machining Guide (718 & 625) Inconel is a family of nickel-chromium-based superalloys engineered for extreme service — sustained strength above 1,200°F, resistance to oxidation, creep, and corrosive combustion environments. Olympus Machining is a U.S.-based, ITAR-registered CNC machine shop in Hanover, Pennsylvania (CAGE 9V9P0) producing Inconel components for aerospace OEMs, defense primes, and high-pressure energy systems. ## Inconel Grades We Machine - **Inconel 718 (UNS N07718, AMS 5662 / 5663):** Age-hardenable nickel-chromium superalloy. Tensile strength ~1,240 MPa (180 ksi) after precipitation hardening. The aerospace standard for turbine disks, engine casings, fasteners, and missile components — strong, weldable, and stable from cryogenic temperatures up to 1,300°F. - **Inconel 625 (UNS N06625, AMS 5666):** Solid-solution-strengthened nickel-chromium-molybdenum alloy. Tensile ~830 MPa (120 ksi). Outstanding corrosion resistance to seawater, acids, and combustion gases. Used for exhaust systems, bellows, chemical processing components, and subsea/oil-and-gas hardware. - **Inconel 600 & 825:** Available on request for chemical processing, heat-treatment fixtures, and specialty corrosion service. ## Why Inconel Is Difficult to Machine Inconel work-hardens aggressively under cutting pressure. Heat does not dissipate through the chip (thermal conductivity is roughly one-seventh that of aluminum), so the cutting edge runs hot. The alloy maintains hardness at elevated temperature — the same property that makes it valuable in turbines — which destroys cutting tools that rely on softening the chip. Chips weld to the cutting edge and form built-up edge if feed pressure drops, and tool life is measured in minutes rather than hours. Successful Inconel machining requires controlling three variables together: heat (high-pressure flood coolant or through-spindle coolant), cutting pressure (positive, sharp geometry; never let the tool rub), and consistent chip load (constant feed engagement through every transition). ## Tooling & Strategy - Coated carbide (AlTiN, TiAlN) for general milling and turning of Inconel 718 at 80–150 SFM; ceramic (SiAlON) inserts at 600–1,000 SFM for roughing where rigidity allows. - Trochoidal milling toolpaths to limit radial engagement (5–10% stepover) and protect tool life on pockets and slots. - Climb milling with positive-rake geometry; conventional cutting work-hardens the surface ahead of the next pass. - High-pressure flood coolant (≥1,000 psi where available) to evacuate chips and pull heat from the cutting zone. - Rigid workholding and short tool overhang; Inconel chatter destroys both edge and surface finish. - Single-pass finishing wherever possible — a re-cut over a work-hardened surface is more abrasive than the original cut. ## Typical Tolerances & Finish - ±0.001″ on milled features, ±0.0005″ on precision turned diameters and bores - Ra 0.8–1.6 µm as-machined; finer with finish passes or downstream polishing - AS9102 Rev C First Article Inspection on aerospace and defense orders - Material certifications and Certificates of Conformance with every shipment - Heat-lot traceability to mill cert per AMS standards ## Typical Applications ### Aerospace & Defense (Inconel 718) Turbine disks and blades, engine casings, combustor liners, missile and rocket components, high-temperature fasteners, and aft-section structural hardware. ### High-Pressure Systems (Inconel 625) Exhaust manifolds, bellows, expansion joints, subsea wellhead components, downhole tooling, and chemical processing fittings exposed to chloride or acid service. ### Defense Components Suppressor baffles for high-volume-fire applications, missile housings, and propulsion hardware where heat resistance is non-negotiable. ### Energy & Power Generation Gas turbine hot-section parts, nuclear instrumentation hardware, and high-pressure steam fittings. ## DFM Considerations for Inconel Parts - Generous internal radii (≥0.060″ minimum) reduce tool engagement spikes and extend cutter life. - Avoid thin walls under 0.030″ unless absolutely required — Inconel deflects less than steel but heats more. - Specify Ra only where function demands it; tighter finish requirements multiply cycle time on superalloys. - Call out heat-treat condition (solution-annealed vs. aged) on the drawing — machinability and final hardness differ significantly. ## Need Inconel Parts Quoted? Send a drawing or STEP file with material grade, heat-treat condition, and tolerance schedule. A CAM engineer reviews every quote. [Submit a Drawing](/#submission) ## Related - • [All Materials Machined](/materials-machined) - • [Titanium CNC Machining](/materials/titanium-cnc-machining) - • [Aerospace & Defense Machining](/industries/aerospace-defense) - • [ITAR & CMMC Compliance](/compliance) Last reviewed: May 12, 2026 [CNC Milling](/cnc-milling)| [CNC Turning](/cnc-turning)| [Quality Assurance](/quality-assurance)| [Prototype to Production](/prototype-to-production)| [Industries Served](/industries-served)| [Materials Machined](/materials-machined)| [Robotics & Automation Machining](/robotics-automation-machining)| [Precision CNC Machining](/precision-cnc-machining)| [Careers](/careers)| [ITAR CNC Machining for Mid-Atlantic Aerospace OEMs](/itar-cnc-machining-mid-atlantic-aerospace) [CNC Tolerances & GD&T Guide](/resources/cnc-machining-tolerances-gdt-guide)| [Reducing CNC Machining Costs](/resources/reducing-cnc-machining-costs)| [6061 vs 7075 Aluminum](/materials/6061-vs-7075-aluminum)| [Brass vs Bronze Machining](/materials/brass-vs-bronze-machining) [![Olympus Machining LLC logo — CNC machining shop Hanover, PA](/assets/olympus-logo-DbWcTX06.webp)](/) Olympus Machining LLC is a precision CNC machining shop in Hanover, Pennsylvania, providing CNC milling and turning services for OEMs and manufacturers nationwide. Olympus Machining LLC · 639 Frederick St, Suite 1 · Hanover, PA 17331 · [(717) 634-5094](tel:+17176345094) Explore all [areas served, industries, and capabilities →](/sitemap) © 2026 All rights reserved.[Admin](/auth) [Compliance & Cybersecurity](/compliance)| [Privacy Policy](/privacy-policy)| [Sitemap](/sitemap) ITAR-aligned internal controls. Cybersecurity practices aligned with CMMC Level 1 (FAR 52.204-21). [Call (717) 634-5094 ](tel:+17176345094)