Which stainless steel should surgical instrument parts be machined from?

316L with electropolishing is the default for corrosion resistance and cleanability; 17-4 PH where a jaw or shaft needs hardness up to 44 HRC; 420/440C for cutting edges. The finish call-out matters as much as the alloy — electropolish plus passivation is what survives repeated autoclaving.

Can a supplier without ISO 13485 make parts for a medical device?

For many machined components, yes — the device maker holds the design controls and the machining supplier delivers to print with full documentation: material certificates to EN 10204 3.1, dimensional reports or CMM data, and FAI. We state plainly which certifications we do and do not hold, and quote the documentation scope at RFQ so your quality file is complete.

What surface finish is needed on PEEK parts for medical use?

Machined PEEK typically holds Ra 0.4–0.8 µm as-cut with sharp tooling; where fluid paths or tissue contact demand better, we quote controlled finishing passes rather than polishing compounds that can embed. Material lot traceability travels with every batch because the resin grade is what your biocompatibility file rests on.

Industry

Medical Devices

Name: CNC Machining for Medical Devices
Brand: FabVector

Documented precision in 316L, titanium and PEEK for surgical and device programs.

FabVector machines Medical Devices parts in Stainless Steel 316L, Titanium Grade 5 (Ti-6Al-4V), PEEK, from 1 piece, with instant online estimates, engineer-reviewed quotes in 24 hours and NDA-protected files. Delivery with duties handled to the US, Canada, UK and Australia.

Materials: Stainless Steel 316L, Titanium Grade 5 (Ti-6Al-4V), PEEK
Minimum order: 1 piece
Estimate: ~60s online
Quote: engineer-reviewed 24h
IP: NDA from upload

What slows this industry down

Medical machining is documentation as much as precision: every 316L instrument body and PEEK component must trace back to certified mill stock through a controlled process, and a missing certificate stalls a regulatory submission. Biocompatibility means material substitutions that other industries shrug off are simply not allowed. Patient-contact surfaces routinely call for Ra 0.4 µm with electropolish or passivation per ASTM standards your quality system cites. And device programs iterate under design control, so the supplier has to deliver fast revisions without losing the paper trail.

Typical parts we machine

Surgical instrument bodies, tips and handles
Implant trials and sizing instruments
Device enclosures and chassis for diagnostic equipment
Fluidic manifolds for IVD systems
PEEK radiolucent components

Recommended materials

01Stainless Steels

Stainless Steel 316L

Marine and medical stainless: molybdenum chemistry that shrugs off chlorides and sterilization cycles.

02Titanium Alloys

Titanium Grade 5 (Ti-6Al-4V)

Half the weight of steel at full strength, bio-inert, corrosion-proof — and priced accordingly.

03Engineering Plastics

PEEK

The polymer that replaces metal: 250 °C service, chemical immunity, implant-grade options.

04Engineering Plastics

PEI (Ultem 1000)

The thinking engineer's high-performance pick: amber-transparent, flame-rated, autoclavable — at half the PEEK price.

Recommended finishes

01Chemical Treatments

Electropolishing

Reverse plating that brightens, deburrs and passivates stainless in one step.

02Chemical Treatments

Passivation

Chemical hygiene for stainless: strips embedded iron so the steel can be as stainless as advertised.

03Marking

Laser Marking

Permanent identification with zero dimensional change: serials, logos and codes burned in, not stuck on.

Certifications & standards

ISO 13485: We understand ISO 13485 supply chains: controlled processes, full material traceability and certificates of conformance to feed your QMS.
FDA 21 CFR 820: We support purchasing controls under FDA 21 CFR 820 with documented inspection records and lot-level traceability on every shipment.
ISO 10993: We support ISO 10993 biocompatibility files by machining only certified medical-grade stock with mill certs supplied per lot.
ANVISA RDC 665: For Brazil-bound devices, we understand ANVISA good manufacturing practice expectations and provide the supplier documentation your registration requires.

We understand and support these requirements; certification and documentation scope is confirmed per order.

Questions medical devices buyers ask

Which stainless steel should surgical instrument parts be machined from?: 316L with electropolishing is the default for corrosion resistance and cleanability; 17-4 PH where a jaw or shaft needs hardness up to 44 HRC; 420/440C for cutting edges. The finish call-out matters as much as the alloy — electropolish plus passivation is what survives repeated autoclaving.
Can a supplier without ISO 13485 make parts for a medical device?: For many machined components, yes — the device maker holds the design controls and the machining supplier delivers to print with full documentation: material certificates to EN 10204 3.1, dimensional reports or CMM data, and FAI. We state plainly which certifications we do and do not hold, and quote the documentation scope at RFQ so your quality file is complete.
What surface finish is needed on PEEK parts for medical use?: Machined PEEK typically holds Ra 0.4–0.8 µm as-cut with sharp tooling; where fluid paths or tissue contact demand better, we quote controlled finishing passes rather than polishing compounds that can embed. Material lot traceability travels with every batch because the resin grade is what your biocompatibility file rests on.