Medical Device CNC Machining
Medical device work has the largest gap on this site between "we can machine that part" and "we can machine that part for a regulated device". The gap is paperwork, traceability, and material discipline — not capability with the spindle. A shop that quotes a Ti-6Al-4V implant component the same way it quotes a 6061 bracket is telling you what kind of supplier it actually is.
For OEM medical and dental device programs, the questions on our side of the conversation are the questions a regulated buyer should be asking: which ASTM grade, which heat treat condition, which sterilization method survives the cycle, and which lot certification follows the part to the receiving dock.
What we handle
- Implant components, surgical instruments, dental hardware, drug-delivery parts, and diagnostic instrument bodies on OEM and prototype releases.
- Medical-grade titanium, stainless, cobalt-chrome, and implant PEEK — sourced against the ASTM spec your drawing names, with mill cert lots retained.
- Full process scope from material sourcing through inspection records, with ISO 13485-controlled production for device programs and clean handling for parts headed to sterile assembly.
Why medical device CNC is more about paperwork than tool paths
The cutting itself rarely separates a competent shop from an incompetent one on a medical part. The thing that separates them is what happens before and after the cut: which mill cert came in with the bar stock, what condition the alloy was supplied in, which inspection records ship with the carton, whether the part was handled with gloves and packaged in the right barrier, and whose name is on the certificate that the device manufacturer hands to the auditor six months later.
Practically, every medical RFQ that lands here has three answers we need before we can quote: the ASTM material spec on the drawing, the sterilization method the finished device will see, and the device's patient-contact class. Those three answers shape everything downstream — stock source, routing, fixture cleanliness, packaging, and the records that ship with the lot.
Sterilization compatibility by alloy — the conversation that drives the quote
A medical device drawing is not done until the sterilization method is on it. The matrix below shows how the alloys we machine for medical work hold up against the four sterilization cycles that turn up most often. Use it to rule grades in or out before locking the BOM.
| Material | Steam autoclave | Gamma irradiation | Ethylene oxide (EtO) | Hydrogen-peroxide plasma |
|---|---|---|---|---|
| Ti-6Al-4V (Grades 5 & 23) | Excellent — repeated cycles, no degradation | Excellent | Excellent | Excellent |
| 316L stainless | Excellent — the workhorse of reusable surgical instruments | Excellent | Excellent | Excellent |
| 17-4 PH stainless | Good in solution-treated condition; verify heat treat against the spec | Excellent | Excellent | Good |
| CoCrMo (ASTM F75 / F1537) | Excellent | Excellent | Excellent | Excellent |
| Implant-grade PEEK | Good — repeated cycles can affect dimensional stability over time | Limited — gamma can degrade some PEEK formulations; check the supplier datasheet | Excellent | Good |
| Aluminum 6061 (non-implant only) | Limited — repeated steam exposure pits the surface over time | Excellent | Excellent | Excellent |
The matrix is a planning tool, not a compatibility certificate. Specific behaviour depends on the supplier's grade, the heat treat condition, the surface finish, the cycle parameters, and the device's intended use. Name the sterilization method on your drawing and we will confirm the stock source against it before cutting starts.
Medical-grade materials we machine
A short list of the alloys and polymers that turn up on most medical RFQs that land here. Each card names the ASTM specification, because "medical-grade titanium" without a spec number is not a procurement instruction.
Ti-6Al-4V Grade 5 (ASTM F1472)
The titanium workhorse for surgical instruments, dental hardware, and non-implant medical components. Strong, biocompatible, corrosion resistant in body chemistry, and supported by every major sterilization route.
Ti-6Al-4V Grade 23 ELI (ASTM F136)
The extra-low-interstitial implant grade. Lower oxygen and iron content than Grade 5 gives improved fracture toughness for orthopedic and spinal implants where the device sees long-term cyclic load.
316L stainless (ASTM F138)
The reusable-surgical-instrument default. Low-carbon austenitic stainless with the corrosion resistance and sterilization tolerance to survive thousands of autoclave cycles without pitting at the cut surfaces.
17-4 PH stainless (ASTM F899)
Precipitation-hardening stainless used where instruments need higher strength than 316L can provide — needle holders, scissors, and load-bearing surgical hardware. Heat treat condition (H900, H1025, etc.) drives both cutting and final properties.
CoCrMo (ASTM F75 / F1537)
Cobalt-chromium-molybdenum alloy for orthopedic implants, joint replacement components, and dental framework structures. Wear resistance and biocompatibility unmatched by stainless steels in long-term implanted applications.
Implant-grade PEEK
Radiolucent, biocompatible thermoplastic for spinal cages, trauma fixation, and other implant components where a polymer is preferred over metal. Specify the supplier-graded medical formulation explicitly — generic PEEK is not the same product.
For non-medical work in these grades and the broader engineering material list, see metal machining and plastic machining; the underlying milling and turning operations are documented on the CNC milling and CNC turning pages.
Verification your auditor can actually use
On a medical device part, "it measures good" is not enough. The inspection record, the material certificate tied to an ASTM grade, and the lot traceability that follows the part to the receiving dock all have to reconcile with the drawing and the PO. Otherwise receiving flags the lot, the device manufacturer's auditor asks an uncomfortable question six months later, and the schedule slips in both directions. The cutting rarely separates a competent shop from an incompetent one on a medical part. The records do.
Medical device work runs under our ISO 13485-controlled quality system, with documented procedures for design review, material traceability, in-process inspection, final inspection, and records retention. Inspection is planned around the drawing's critical features — not blanket "check everything" layouts — and the results are logged against the lot so the paperwork reconciles with the parts in the carton. Mill certification lots are retained against each ASTM-specified stock batch: Ti Grade 23 ELI per ASTM F136 on implants, 316L per ASTM F138 on reusable instruments, CoCrMo per ASTM F75 / F1537 on orthopedic components, implant-grade PEEK on the polymer side.
Three answers up front shape everything downstream: the ASTM material spec on the drawing, the sterilization method the finished device will see, and the device's patient-contact class. Name them on the RFQ — along with any customer-specific quality clauses, FDA 21 CFR Part 820 references, or device-class-specific requirements — and the quote includes the production controls, packaging, and records needed to meet them. That discipline is what lets the next lot land at receiving without a phone call, and what a quality auditor actually expects to see.
Medical device categories we machine
The categories below cover the bulk of medical device work that lands here. Each one has its own regulatory weight and its own scope conversation — describe the device class and we can usually peg the right pattern from a one-paragraph brief.
Orthopedic implants
Bone plates, screws, joint components, spinal hardware. Usually Ti Grade 23 ELI or CoCrMo stock, machined to ASTM finish requirements with surface treatment and packaging scoped per the device program. The most regulated category on this list — expect a longer discovery conversation before quoting.
Surgical instruments
Scalpels, forceps, retractors, needle holders, scissors, custom procedure-specific tools. 316L for general work, 17-4 PH where the cutting edge or pivot needs hardness. Reusable instruments live thousands of autoclave cycles, so the surface finish and corrosion-resistance story matters.
Dental implants & components
Implant fixtures, abutments, healing caps, dental tooling, and prosthetic frameworks. Ti-6Al-4V dominates the implant side; CoCrMo turns up on prosthetic frameworks. Tolerance and surface treatment requirements are specific to the implant system.
Drug-delivery hardware
Syringe components, injector mechanisms, infusion-pump hardware, drug-cartridge fittings. Stainless and machinable polymers in tight-tolerance assemblies where the sealing and dispensing accuracy is the entire product story.
Diagnostic & lab instruments
Sample handlers, optical mounts, fluidics components, instrument frames, and analytical-equipment hardware. Often non-patient-contact, which simplifies the regulatory conversation considerably and broadens the alloy list.
Device housings & enclosures
Imaging-equipment chassis, monitor housings, sensor enclosures, control-panel hardware. Aluminum 6061 with a chemical conversion coat or anodize covers most non-contact device exteriors at a fraction of the cost of medical-grade alloys.
Medical machining FAQs
Medical RFQ
Quote a medical device part the way an auditor expects
Send the 3D, the 2D drawing with GD&T, the ASTM material spec, the sterilization method, and the device class. The quote comes back with stock source, routing, inspection scope, and the regulatory boundaries spelled out in plain language.
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