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Medical Hypodermic Stainless Steel Tubing— Accumetrics Tubing
Hypodermic Tubing, Made to Medical Specs
Accumetrics manufactures precision hypodermic (hypo) tubing— Seamless welded & drawn over a floating plug—for exceptionally tight OD/ID control, clean IDs, and repeatable performance in critical devices.
What Is Hypodermic Tubing?
Hypodermic tubing is small-diameter stainless steel tubing, seamless, welded and drawn over a floating plug to develop final OD, wall, and ID—delivering concentricity, smooth internal surfaces, and tight, repeatable tolerances required for medical applications.
- Process: TIG-welded & drawn; floating plug for ID control
- Typical finish windows: ID/OD 8–16 Ra (standard); annealed 16–32 Ra
- Common OD range supplied: ~0.008–0.300 in; ultra-thin walls available
Materials for Medical Use
Accumetrics supplies hypodermic tubing primarily in Type 304 and Type 316/316LVM stainless steels for corrosion resistance and strength in contact with body fluids and sterilants.
- 304: extensive stock & quick-turn draws
- 316/316L: for chloride environments and implant-adjacent accessories
- Tempers: full hard through annealed per application needs
Importance of Surface Finish in Medical Tubing
Precision surface finish is critical for performance and biocompatibility in medical applications.
Why It Matters
- Ensures smooth inner diameter (ID) for consistent fluid flow and catheter performance
- Minimizes risk of particle generation and contamination
- Enhances biocompatibility and cleaning efficiency
- Reduces friction during insertion or assembly
- Supports high-quality welds and connections in micro-assemblies
Superior Fabrications/Secondary Ops
We manufacture the tubing and finish it to print—one supplier, cleaner paperwork.
Tube Manufacturing to Enhance to the Following:
- Cut to length (burr-controlled)
- Bending & coiling
- Flaring, swaging, grooving, dimpling
- Pointing/beveling & laser cut features
Cleanliness & Packaging
- Commercial clean or enhanced ultrasonic processes
- Passivation on request (citric)
- Dedicated medical packaging & ID protection
Engineering Support
- Application review and manufacturability feedback
- Help translating gauge sizes to OD/ID/wall tolerances
- Process guidance for tight clearances, flow, and fit
- Rapid prototyping paths & blanket release programs
Hypotube Reference Chart (304 & 316)
Below is the standard U.S. gauge framework used by device engineers to specify stainless hypotube. Sizes commonly stocked in 304; many gauges also offered in 316/316L. For a complete, up-to-date chart, include your required gauge, OD/ID, and wall in your RFQ.
| Gauge | OD (in) | ID (in) | Nominal Wall (in) | Notes |
|---|---|---|---|---|
| 7XX* | .180 | .173 | .0035 | *also in 316/316L |
| 10TW* | .134 | .114 | .010 | *also in 316/316L |
| 11TW* | .120 | .100 | .010 | *also in 316/316L |
| 14RW* | .083 | .063 | .010 | *also in 316/316L |
| 16RW* | .065 | .047 | .009 | *also in 316/316L |
| 18RW* | .050 | .033 | .0085 | *also in 316/316L |
| 20RW* | .0355 | .0235 | .006 | *also in 316/316L |
| 22TW* | .028 | .020 | .004 | *also in 316/316L |
| 25RW* | .020 | .010 | .005 | *also in 316/316L |
| 30RW* | .012 | .006 | .003 | *also in 316/316L |
| 33RW* | .008 | .004 | .002 | *also in 316/316L |
| 35RW* | .005 | .002 | .0015 | *also in 316/316L |
Tip: Include target OD/ID tolerance bands, surface finish (ID/OD), cleanliness, and packaging in your RFQ for the fastest turn.
Where Our Hypotube Goes
- Medical — catheters, biopsy, delivery systems, hypotube shafts
Quality & Documentation
- Material traceability with certified material test reports
- Tubes produced to applicable customer/ASTM requirements
- In-process inspection and final verification
- ISO 9001 - 1345
Ready to Spec Your Hypotube?
Send your print specifications, and our tubing experts will get work on your behalf immediately.
- Low minimums for development, blanket releases for production
- Rapid quotes and manufacturability feedback
- Surface finish options for smooth ID flow and reliable press-fits