Inconel 718 Machining Services

Also known as UNS N07718 · 2.4668 · ASTM B637

Inconel 718 machining at DEK covers UNS N07718 / 2.4668 parts from one prototype to production, with no MOQ and a 3-day prototype lead time. This precipitation-hardening nickel superalloy is milled on 3/4/5-axis platforms with coolant-through tooling and verified on in-house CMM.

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UNS N07718
W.Nr. 2.4668
ASTM B637

~1275 MPa

UTS (Aged)
~1035 MPa

Yield (Aged)
40–45 HRC

Hardness (Aged)
≤650°C

Max Service Temp

Inconel 718 CNC Machining Capabilities

Tolerances DEK holds in precipitation-hardening alloy machining of 718, from ISO 2768-f/m to ±0.003 mm on micro parts.

General Tolerance
±0.013 mm
typical, ISO 2768-f/m
Critical Features
±0.005 mm
bore fits, coaxiality
5-Axis Profile
±0.01 mm
complex geometry
Micro Components
±0.003 mm
sub-10 mm parts
As-Machined Finish
Ra 0.8–1.6 µm
typical
Ground Finish
Ra 0.4 µm
or better, ground/lapped
Max Part Size
~1000 mm
large structural parts
Prototype Lead Time
3 days
ship as fast as 1 day

Inconel 718 Properties and Designations

Solution-annealed vs aged property data for Inconel 718, the nickel-chromium superalloy strengthened by niobium and molybdenum.

Mechanical (Annealed)

Ultimate Tensile Strength 900–930 MPa
Yield Strength 490–510 MPa
Elongation at Break 40–45%
Hardness ≤35 HRC

Mechanical (Aged)

Ultimate Tensile Strength ~1275 MPa
Yield Strength ~1035 MPa
Elongation at Break 12–20%
Hardness 40–45 HRC

Physical & Thermal

Young's Modulus 190–200 GPa
Thermal Conductivity 11–11.4 W/(m·°C)
Max Continuous Service ≤650°C (1200°F)
Creep-Rupture, Short-Term 700°C (1300°F)

Designations & Conditions

UNS N07718
W.Nr. 2.4668
Standard ASTM B637
Supply Condition Solution-annealed
Aging Specification AMS 2774
Weldability Excellent (annealed)
Stock Forms Bar/plate/sheet/forging

Why Inconel 718 Is Difficult to Machine

How DEK controls work-hardening, heat and tool wear in nickel superalloy machining, with tooling and feed data.

Inconel 718 work-hardens rapidly under cutting pressure and conducts little heat, so the cutting edge carries the load. DEK runs it on rigid 3/4/5-axis platforms with sharp, coated carbide and constant, positive feed rates.

Solid-carbide practice runs roughly 20–40 SFM at 0.002–0.004 in/tooth, a fraction of the 300+ SFM common on aluminum. That gap explains longer cycle times and higher per-part cost, and why 718 sits on DEK’s validated process list for hard-to-machine alloys.

Coolant-through machining aimed at the tool-workpiece interface, not flood coolant alone
In-house CMM verification and SPC checkpoints catch drift at the part, not after shipping
The validated list also covers Ti-6Al-4V, 17-4PH, 316LVM and PEEK

Cutting Speed
20–40 SFM
solid-carbide tooling
Chip Load (in/tooth)
0.002–0.004
solid-carbide practice
Machinability Rating
~12%
of free-machining steel
Thermal Conductivity
11–11.4 W/(m·°C)
heat goes into the tool
Work-Hardening
Rapid
stiffens under cut pressure

Custom Inconel 718 Parts by Industry

Industries that rely on DEK's Inconel 718 parts for strength at elevated temperature and corrosion resistance.

Aerospace Components

Non-flight-critical structural and cabin support parts that must hold dimension after repeated thermal cycling.
Energy Components

Components exposed to sustained heat and corrosive process media, where 718 retains strength at elevated temperature.
Semiconductor Hardware

Chamber and process-adjacent hardware, where the corrosion resistance of 718 suits demanding service environments.
Robotics Components

High-strength components where weight trades against load capacity, machined from prototype through production.

Inconel 718 vs Inconel 625 and 17-4 PH

Choose 718 when parts need its aged mechanical properties at temperature. Inconel 625 is more weldable for corrosion-heavy service; 17-4 PH costs less when 718's temperature ceiling isn't needed.

Criteria	This GradeInconel 718	Inconel 625	17-4 PH
Alloy type	Ni-Cr superalloy	Inconel grade	Stainless
Strength	~1275 MPa (aged)	Lower	–
Weldability	Excellent (annealed)	More weldable	–
Aged properties	Yes	Not required	–
Temperature ceiling	≤650°C continuous	–	Lower
Cost	Higher	–	Lower
Typical use	Strength at heat	Corrosion service	Aerospace grade

Inconel 718 Heat Treatment and Finishes

CNC machining + finish options for Inconel 718, including the solution + age cycle per AMS 2774 and surface finishes.

Solution + Age Cycle Available

DEK coordinates the solution + age cycle per AMS 2774 after CNC machining, bringing 718 parts to aged properties instead of shipping the softer annealed state.
Passivation Available

CNC machining + passivation for Inconel 718 parts, offered as a finish option on the same engineer-reviewed quote as the machining.
Plating Available

CNC machining + plating is available on 718 parts; specify the plating type on your drawing and it is quoted together with machining.
Powder Coating Available

CNC machining + powder coating is listed among the finish options for Inconel 718 parts, quoted together with the machining work.
Grinding Available

Ground or lapped 718 features reach Ra 0.4 µm or better where a spec calls for it, versus Ra 0.8–1.6 µm typical as machined.

Get a Quote for Inconel 718 CNC Machining

No MOQ: a single validation part gets the same quoting and QA path as a production release. Prototypes in 3 days, shipping as fast as 1 day after inspection.

Request a Quote All Inconel Grades

Why DEK for Inconel 718 Machining

DEK carries 718 parts from prototype to production under one process plan, with certified quality checkpoints and cost drivers flagged before you submit a drawing.

Certified Quality for Critical 718 Parts

For UNS N07718 machining and 2.4668 machining programs, DEK operates under ISO 9001, AS9100D and ISO 13485, all obtained through TUV. Every job moves through IQC, IPQC, FAI, OQC, SPC and CAPA checkpoints, backed by in-house CMM inspection and full material traceability.

Mill test reports can reference AMS 5662 (bar, forging, ring) and AMS 5663 (aged bar and forging), with First Article Inspection reports per AS9102 where a program calls for it. See our quality system.

What Drives Inconel 718 Machining Cost

718 wears cutting edges faster than aluminum or mild steel, so tool changes and re-indexing add non-cutting time that a realistic quote accounts for upfront.

Thin walls flex under cutting force, pushing toward slower feeds and more finishing passes
Deep pockets and high depth-to-diameter ratios limit tool rigidity and force smaller stepovers
Prototype volumes carry higher per-part setup cost; production quantities spread it once validated

Raw Stock

CNC Machined

Finished Parts
Raw Stock

CNC Machined

Finished Parts

Inconel 718 Machining FAQ

Common questions from engineers and buyers sourcing Inconel 718 parts.

What is the machinability rating of Inconel 718?

Industry machinability indexes place 718 near the bottom of the scale, commonly cited around 12% of the free-machining steel baseline. Tooling rigidity, coolant strategy and shop experience therefore matter more than with standard alloys; DEK runs 718 against a validated process rather than as a standard job.

What are the downsides of Inconel 718?

From a sourcing standpoint: higher machining cost and cycle time from work-hardening and tool wear, and longer lead times if a shop lacks dedicated coolant-through tooling. Ask any prospective supplier whether their 718 process is validated or improvised per job.

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