Metal fabrication for parts used in the medical and electronics industries can involve dimensions as small as a grain of rice — or even a strand of hair. At that scale, surface defects may be invisible to the naked eye, but their consequences are anything but small.
Microburrs, microcracks, and surface irregularities on precision components can compromise performance, accelerate corrosion, and create contamination risks in critical applications. That is why engineers and manufacturers across industries specify electropolishing as the finishing process of choice for their smallest, most intricate parts.
How Small of a Part can be electropolished?
One of the most common questions we hear from engineers is: how small a part can actually be electropolished?
The answer largely comes down to racking — the specialized fixturing that holds parts in the electropolishing bath. Effective racking ensures no part-to-part contact and consistent electrolytic action across every surface. At Able Electropolishing, we have custom rack makers on every shift to handle parts with tight tolerances, complex geometries, or features that require highly specialized setups.
Our rack makers routinely work with parts so small they must be handled with tweezers. Examples include medical implants as small as .125" long. Other small parts we commonly electropolish include:
- Cannula parts and hypodermic needles — including tubing with diameters as small as .050"
- Medical and dental instruments — bone screws, stents, and tiny orthodontic components
- Fasteners — small screws, bolts, nuts, rivets, and washers
- Precision wire forms and electronic components — contact pins, intricate wire forms, and micro connectors
For high-volume small parts like fasteners and wire forms, bulk electropolishing offers a cost-effective alternative to individual racking. Able has further advanced this capability with an automation-enhanced bulk process that ensures consistent, repeatable results at scale.
The Benefits of Electropolishing for Small and Precision Parts
Electropolishing offers several distinct advantages over manual or mechanical polishing methods — particularly when part size and dimensional accuracy are critical.
Precise, controlled material removal: Electropolishing typically removes .0002" to .001" of surface material, making it safe for tight-tolerance parts where even minimal dimensional change matters. The process selectively removes surface peaks — the microscopic high points where stress and corrosion initiate — without altering the underlying geometry of the part.
Elimination of surface defects: The electropolishing process removes microcracks, microburrs, embedded particles, and heat tint left from machining or forming operations. For small parts used in medical devices or other applications, this level of surface cleanliness is often a functional requirement, not just an aesthetic one.
Enhanced corrosion resistance: By removing the outermost layer of surface material and embedded contaminants, electropolishing leaves stainless steel and other alloys in a passive, corrosion-resistant state. This can significantly extend the service life of small parts exposed to harsh environments or repeated sterilization cycles.
Reduced surface roughness and improved cleanliness: Electropolishing produces a microscopically smooth surface that resists bacterial adhesion, particle entrapment, and fluid buildup — properties that are especially important for medical implants, surgical instruments, and fluid-handling components.
No mechanical stress: Unlike abrasive polishing methods, electropolishing introduces no mechanical stress to the part surface. This is a meaningful advantage for fragile or thin-walled components where physical contact during finishing could cause distortion or damage.
Why Specify Able Electropolishing for Your Small, Precision Parts
Able Electropolishing has been a pioneer in the electropolishing industry for decades, working closely with engineers across medical and electronics applications to solve complex finishing challenges. Our capabilities for small and intricate parts include:
- Custom rack making on every shift for parts of any size or geometry
- State-of-the-art robotic automation for consistent, high-volume processing
- In-house surface testing and analysis to verify results and support validation documentation
Whether your parts are racked individually or processed in bulk, our team brings the experience and technical depth to deliver a finish that meets your specifications.
To learn more about our electropolishing capabilities for small and precision components, contact a member of our team.
