Nominal geometry
One supplier lists 15TW at 0.0720" nominal OD and 0.0060" nominal wall, giving 0.0600" nominal ID by geometry. The calculator estimates an ideal circular lumen area of about 1.82 mm² before tolerances, coatings, or deformation.
15TW Hypotube Calculator
Estimate 15TW ID and lumen area from nominal wall.
Interactive sizing tool
15TW hypotube calculator
Compare with 15RW or enter a custom wall.
Formula used: ID = OD - 2WT. The tool keeps the example OD fixed at 0.0720" (1.8288 mm). Supplier charts and drawings may specify different limits.
Treat the output as an early feasibility screen. Actual dimensions will depend on the supplier chart, manufacturing tolerances, coatings, and lot inspection records.
Calculation ready
One supplier chart lists a 0.0060" nominal wall and 0.0600" nominal ID. This is a dimensional example, not a performance rating.
Inner diameter
0.0600"
1.5240 mm
Wall thickness
0.0060"
0.1524 mm
Lumen area
1.82415
mm2 (2.827e-3 in2)
Area moment (I)
6.830e-7
in⁴; cross-section only, not finished assembly stiffness or strength
Result interpretation
This profile gives a nominal 0.0600" ID by ID = OD - 2WT. Ensure the internal space accommodates the required fluid volume, guidewire, or inner device components after supplier tolerance, coating buildup, and bend-state ovalization are deducted.
Performance needs testing
A larger lumen changes the tube cross-section, but nominal OD and wall do not predict pushability, kink resistance, fatigue, or torque in a finished catheter shaft. Define requirements and test representative assemblies.
Supplier limits matter
One published 316H15TW listing gives dimensional limits around its nominal values. Other alloys, suppliers, lots, and finishing steps may differ; use the selected product drawing and inspection data for clearance decisions.
Supplier-listed 15 Gauge Profile Examples
Nominal cross-sections based on one supplier chart. The larger 15TW lumen is a geometric comparison, not a mechanical performance rating.
Example dimensions from one supplier chart
| Gauge Profile | OD (in) | Wall (in) | ID (in) | Source context |
|---|---|---|---|---|
| 15RW (Regular) | 0.0720" | 0.0090" | 0.0540" | Published 15RW catalog example |
| 15TW (Thin) | 0.0720" | 0.0060" | 0.0600" | Published 15TW catalog example |
Kink Resistance & Bend Radius
There is no universal safe minimum bend radius implied by the 15TW designation. Kink and ovalization behavior depends on the actual tube, support conditions, cut pattern, and finished assembly.
Next step: Define bend and flow requirements, then test representative assemblies. If they do not meet the criteria, evaluate support or reinforcement and retest the revised design.
Tolerance Sensitivity & Concentricity
One published 316H15TW listing gives a 0.0050–0.0070" wall range around its 0.0060" nominal, plus OD and ID limits. That is a supplier-specific example, not a universal tolerance. Actual clearance depends on the specified dimensions and their inspection limits.
Next step: Set tolerances from functional needs and supplier capability. Review the inspection method and worst- case tolerance stack for the exact part and finishing process.
Laser Cut HAZ (Heat Affected Zone)
Thermal effects and cut-edge quality depend on material, tube geometry, and process settings. A study on thin 316L tubes found that process conditions changed the heat-affected zone, kerf, roughness, and dross; it does not set a universal 15TW HAZ value.
Next step: Do not assume a laser type gives “zero HAZ” or that electropolishing preserves the nominal lumen. Qualify the selected process against cut-edge, dimensional, and mechanical acceptance criteria on representative parts.
When 15TW Helps, and When It Distracts
| Scenario | Why 15TW Helps | Decision Watchout |
|---|---|---|
| Fluid delivery & aspiration | A larger nominal ID than the cited 15RW example can create more geometric lumen area. | Flow also depends on finished ID, length, fluid, pressure, fittings, and any liner. Verify flow, leak, and pressure performance on the assembly. |
| Laser-cut delivery shafts | The supplier-listed nominal wall is a starting geometry for process feasibility review. | Qualify the chosen cut pattern and process for edge condition, dimensions, thermal effects, and required mechanical performance. |
| Guidewire passage in tortuous anatomy | The cited 15TW example has a larger nominal ID than the cited 15RW example. | Nominal ID alone does not establish clearance or trackability. Include tolerances, liner/coating, bend state, and the actual guidewire in testing. |
Need to check a specific 15TW drawing?
Share its material, dimensions, tolerances, and finished assembly requirements for a supplier review.
Conclusion, Evidence, Limits, and Next Action
| Decision Point | Evidence Checked | How to Use It | Limit |
|---|---|---|---|
| 15TW dimensional example | MicroGroup lists a 316H15TW product at 0.0720" nominal OD, 0.0600" nominal ID, and 0.0060" nominal wall, with product-specific limits. | Use these values as one supplier-specific screening example, then compare them with the actual quote and drawing. | This listing is for a specific 316 stainless product; it does not establish universal 15TW dimensions or lot acceptance. |
| Profile names and dimensions | MicroGroup’s chart lists 15RW at 0.0720" OD, 0.0090" wall, and 0.0540" ID, and 15TW at 0.0720" OD, 0.0060" wall, and 0.0600" ID. | Compare only profiles and dimensions confirmed by the supplier for the required alloy and product. | Profile names and availability can vary between supplier catalogs; this is one published chart. |
| ISO 9626 scope | ISO describes ISO 9626:2016 as covering rigid stainless-steel needle tubing and explicitly excludes flexible stainless-steel tubing, while encouraging use of its dimensional specifications for flexible tubing. ISO lists a draft revision as under development (checked October 5, 2026). | Check the standard’s scope and applicable requirements for the exact component; do not infer conformity from “15TW” or nominal OD. | A dimensional reference does not validate a patterned tube or finished device assembly. |
| Laser-cut process outcomes | A published study on thin 316L tubes for medical-device applications reports that internal water flow changed heat-affected zone, kerf, surface roughness, and dross outcomes. | Set cut-edge acceptance criteria and qualify the selected process on representative material and geometry. | The study is process-specific and does not establish a universal HAZ size or a zero-HAZ laser recommendation for 15TW. |
| Lot release evidence | Request material and dimensional records that correspond to the quoted alloy, product, drawing revision, and lot. | Agree acceptance criteria and inspection methods with the supplier before design release. | Record names and available inspection data vary; confirm what the supplier can provide for the exact part. |
Data Sources & Evidence
Published July 27, 2026; reviewed October 5, 2026. Use this page as a pre-RFQ screening guide, not as a substitute for a released device drawing.
- -MicroGroup hypodermic tubing chart: lists one supplier’s 15RW and 15TW nominal dimensions. Use the chart as a supplier-specific example, not a universal profile standard.
- -MicroGroup 316H15TW product listing: gives this product’s nominal dimensions and published OD, wall, and ID limits. Confirm the values and inspection records for the exact material and lot you specify.
- -ISO 9626:2016 scope and status: ISO describes requirements for rigid stainless-steel needle tubing and says the standard does not apply to flexible stainless-steel tubing. It encourages adopting its dimensional specifications for flexible tubing; a matching size label alone is not evidence of conformity.
- -Thin 316L tube laser-cutting study: compares dry and wet fibre-laser cutting and reports process-dependent changes to heat-affected zone, kerf, roughness, and dross. The study is not a universal 15TW process specification.
15TW hypotube FAQ
What does 15TW mean in a hypotube supplier chart?
15TW is a supplier wall-profile designation, not a universal performance class. For example, MicroGroup lists one 15TW product at 0.0720" nominal OD, 0.0060" nominal wall, and 0.0600" nominal ID. Confirm the material and dimensional limits on the selected supplier drawing.
When should I use a 15TW hypotube instead of a 15RW?
A supplier chart example lists 15TW at 0.0060" wall and 0.0600" ID, versus 15RW at 0.0090" wall and 0.0540" ID, both at 0.0720" nominal OD. The larger nominal lumen is a geometric tradeoff; these dimensions alone do not establish pushability, kink resistance, or torque performance.
Is there a safe minimum bend radius for 15TW?
There is no universal minimum bend radius established by the 15TW designation. Kink and ovalization performance depends on the actual tube dimensions, alloy and temper, support, and finished assembly. Define a project-specific bend criterion and verify it on representative assemblies.
Can 15TW hypotubes be laser cut?
Laser cutting is used on thin stainless-steel tubes, but edge quality and thermal effects depend on the material and process setup. A published study of thin 316L tubes found that introducing water flow changed heat-affected zone, kerf, roughness, and dross results. Do not assume a laser type guarantees zero HAZ; specify acceptance criteria and validate representative cuts.
Which materials are available in 15TW?
Availability is supplier-specific. The linked MicroGroup 15TW stock example is 316 stainless steel; ask each supplier to confirm the exact alloy, temper, and certifications for the part you intend to buy.
How do tolerances work on a 0.0060" thin wall?
They vary by supplier and product. One published 316H15TW listing gives 0.0050–0.0070" wall, 0.0715–0.0725" OD, and 0.0585–0.0615" ID. Use the limits for the exact material and lot; set drawing tolerances from functional requirements and supplier capability rather than treating this example as universal.
Does the 15TW designation establish ISO 9626 conformity?
No. ISO 9626:2016 covers rigid stainless-steel needle tubing and says it does not apply to flexible stainless-steel tubing, though it encourages adopting its dimensional specifications. As checked October 5, 2026, ISO lists the 2016 edition as published and a draft revision under development. A 15TW label or matching nominal OD alone does not show ISO conformity; check the standard scope and requirements for the specific product.
Can this calculator release production dimensions?
No. The calculator is a feasibility screen for nominal geometry. A released device drawing must control OD, ID or wall, concentricity, straightness, material, temper, surface finish, and acceptance criteria.
How do coatings change 15TW clearance?
An internal coating or liner can reduce usable lumen. For a uniform internal layer, subtract twice its thickness from the measured or specified ID as an initial geometric estimate, then account for process variation and verify the finished clearance.
What evidence should be requested with a 15TW RFQ?
Ask for the material test report (MTR), certificate of conformance (COC), first-article inspection (FAI), wall concentricity method, ID/OD inspection method, and straightness data.
Ready to review a drawing?
Share the target OD, ID or wall, material, tolerances, and finished assembly requirements for a supplier review.