Medical Device Gaging · ISO/IEC 17025 · Made in USA
Medical Plug & Ring Gages
Variable and fixed-limit gages for the medical device industry — hexalobe, Luer taper, bone plate, and complex conical thread gages, engineered with you from concept through certification.
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WESTport's medical gage division designs and manufactures both variable and fixed-limit gages for the medical device industry — with special emphasis on manufacturers of orthopedic and prosthetic devices. From Luer taper and hexalobe gages to bone plate pedestal gages, complex conical thread gages, and fully custom designs, our engineering team works alongside yours from first concept through final certification. Every gage is precision ground, hand lapped, and calibrated in our ISO/IEC 17025 accredited (A2LA) laboratory, and ships with a Certificate of Accuracy traceable to NIST.
The WESTport medical gage line
Each gage is built to the specific demands of your application. Standard forms and proprietary geometries are both welcome — specify the standard, or send a drawing.
- Hexalobe Gages — Plug & Ring. Go/No-Go gages for internal and external hexalobe drive recesses on surgical fasteners, bone screws, and implant components. Built to ISO 10664 or to your patented/proprietary profile.
- Luer Taper Gages — ID & OD. Internal- and outside-diameter gages verifying the 6% Luer taper on syringes, catheters, IV sets, and connectors. Manufactured to ISO 594 and the current ISO 80369 small-bore connector standards.
- Bone Plate Pedestal Gages. Custom fixed-limit gages that verify the features that matter on locking and cortical bone plates — screw-hole diameters, countersink geometry, plate thickness, and feature-to-feature relationships — catching problems before expensive 5-axis-milled parts become rejects.
- Medical Thread Plug & Ring Gages. Fixed-limit Go/No-Go gages for internal and external medical threads, including the complex conical thread forms used in orthopedic and spinal fixation hardware. WESTport is among the foremost medical thread gage manufacturers in the country.
- Variable Thread Inspection System. A system purpose-designed for the medical industry that delivers actual measurement data — not just pass/fail — on conical medical threads: pitch diameter related to standoff, and standoff related to pitch diameter, while reducing overall gage inventory.
- Prototypes & Custom Medical Gages. Print-to-print gage design and build for new and existing devices — fixed-limit or variable, plug or ring, standard or special geometry — with engineering consultation from prototype through production.
What we inspect
Medical gage types compared
Use this to identify the right gage for your inspection requirement. Not sure? Our engineering team will help you choose.
| Feature | Fixed-limit plug | Fixed-limit ring | Variable thread system | Custom / special |
|---|---|---|---|---|
| Measurement mode | Go / No-Go | Go / No-Go | Actual variable data | Fixed or variable |
| Inspects | Internal features & bores | External diameters | Conical thread P.D. & standoff | Any device feature |
| Hexalobe profiles | ✓ | ✓ | — | ✓ |
| Luer taper | ID | OD | — | ✓ |
| Medical thread forms | ✓ | ✓ | ✓ | ✓ |
| Conical thread P.D. | Fixed limit | Fixed limit | Variable data | ✓ |
| Certificate of Accuracy | ✓ | ✓ | ✓ | ✓ |
Medical device applications
Orthopedic & Prosthetic Devices
Bone-screw thread and profile inspection, implant connector threads (conical and standard), and prosthetic component gaging — a WESTport specialty.
Surgical Fasteners & Implant Hardware
Hexalobe drive-recess inspection (ISO 10664 and custom), conical thread pitch diameter, and external fastener thread ring gaging.
Fluid & Drug-Delivery Connectors
Luer taper ID and OD inspection on syringe, catheter, and IV hubs to ISO 594 / ISO 80369 anti-misconnection standards.
Surgical Instruments
Bore and feature inspection, complex thread profiles, drive-recess and hex features, and custom fixture gaging for assemblies.
Dental Devices
Fine-metric implant-fixture threads, abutment connections, retention-fastener threads, and proprietary drive-recess profiles.
New Device Development
Prototype gage design, first-article inspection support, and a practical path from prototype to production gaging.
Standards we manufacture to
Specify the standard on your quote request and we build the gage to match — or send a print for a fully custom form.
| Standard | Scope |
|---|---|
| ISO 10664 | Hexalobular internal driving feature (hexalobe) for bolts and screws |
| ISO 594 | Luer conical fittings (6% taper) for syringes, needles, and connectors |
| ISO 80369 | Small-bore connectors for liquids and gases in healthcare applications |
| ASME B1.2 / B1.16M | Gages for Unified inch and metric screw threads |
| ASME B89.1.5 / B89.1.6 | Plain external and internal diameter measurement |
| ISO/IEC 17025 (A2LA) | Accredited calibration & testing standard — our calibration laboratory is accredited to it; Long Form Certificate available |
| ISO 9001 · ANSI/NCSL Z540-1 · ISO 10012-1 | Quality-system and measuring-equipment requirements |
| Customer print | Print-to-print custom medical gages — any thread form or geometry |
What comes with every gage
- Certificate of Accuracy, NIST-traceable — included with every gage, confirming it meets all applicable dimensional and tolerance requirements.
- ISO/IEC 17025 Long Form Certification available — complete dimensional data, measurement uncertainty, and full NIST traceability; A2LA-accredited, on a 5–7 business day turnaround.
- Hand lapped and polished, every gage — for superior accuracy, optimum surface finish, and maximum wear life, then inspected and certified in our ISO/IEC 17025 accredited laboratory.
- Engineering support included — our design team is a direct extension of your quality group, from first specification review through production.