Technical Description
304 Stainless Steel Capillary Tube – 1.50mm OD x 1.00mm ID x 0.25mm Wall
Welcome to our detailed product page for the 304 Stainless Steel Capillary Tube – 1.50mm OD x 1.00mm ID x 0.25mm Wall. This precision-engineered capillary tube is manufactured from premium 304 stainless steel (UNS S30400), delivering exceptional dimensional accuracy, superior corrosion resistance, and reliable mechanical performance for your most demanding applications.
At Capillary Tubing Network, we combine advanced cold-drawing technology with stringent quality control to produce micro-tubing that meets the tightest specifications. Whether you require components for precision instruments, analytical instruments, or industrial fluid systems, this 304 stainless tube product offers the precision and consistency you need.
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I. Detailed Product Specifications
| Parameter | Value | Tolerance / Standard |
|---|---|---|
| Material Grade | 304 Stainless Steel (UNS S30400) | ASTM A269 / A213 |
| Outer Diameter (OD) | 1.50 mm | ±0.01 mm (ISO 2768-f) |
| Inner Diameter (ID) | 1.00 mm | ±0.01 mm |
| Wall Thickness (WT) | 0.25 mm | ±0.01 mm |
| Wall-to-OD Ratio | 16.7% | Thin wall design |
| Inner Cross-Section Area | 0.7854 mm² | Flow capacity: Excellent |
| Available Length | Custom cut (up to 2500 mm) | ±0.01 mm (laser precision) |
| Surface Finish | Bright Annealed / Electropolished | Ra ≤ 0.4 μm (optional Ra ≤ 0.2 μm) |
| Straightness | ≤ 0.5 mm / 1000 mm | ASTM A269 |
| End Finish | Burr-free, square cut | ≤ 0.05 mm end burr |
| Packaging | Plastic capped / Vacuum sealed | Anti-contamination |
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II. Chemical Composition (Weight %)
| Element | Percentage (%) | Description |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Standard carbon content |
| Chromium (Cr) | 18.0 – 20.0 | Primary corrosion resistance |
| Nickel (Ni) | 8.0 – 10.5 | Austenitic structure stabilizer |
| Manganese (Mn) | ≤ 2.00 | Deoxidizer and strength enhancer |
| Silicon (Si) | ≤ 1.00 | Improves scaling resistance |
| Phosphorus (P) | ≤ 0.045 | Controlled for ductility |
| Sulfur (S) | ≤ 0.030 | Controlled for machinability |
| Nitrogen (N) | ≤ 0.10 | Strengthens austenitic structure |
| Iron (Fe) | Balance | Base material |
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III. Mechanical Properties
| Property | Value | Unit | Test Standard | Notes |
|---|---|---|---|---|
| Tensile Strength | 515 – 690 | MPa | ASTM E8 | Measured at room temperature |
| Yield Strength (0.2% Offset) | ≥ 205 | MPa | ASTM E8 | Cold drawn condition |
| Elongation at Break | ≥ 35 – 45 | % | ASTM E8 | 50 mm gauge length |
| Hardness | ≤ 92 | HRB | ASTM E18 | Rockwell B scale |
| Modulus of Elasticity | 193 – 200 | GPa | ASTM E111 | Typical for austenitic SS |
| Poisson’s Ratio | 0.27 – 0.30 | – | ASTM E132 | – |
| Density | 7.90 – 8.00 | g/cm³ | ASTM A269 | At 20°C |
| Thermal Expansion | 17.3 | μm/m·°C | ASTM E831 | 20°C – 100°C |
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IV. Dimensional Tolerance & Quality Assurance
| OD Range | Inspection Frequency | Inspection Method |
|---|---|---|
| 0.25 mm – 0.50 mm | 100% | Laser micrometer |
| 0.50 mm – 1.00 mm | 100% | Laser micrometer |
| 1.00 mm – 3.00 mm | 100% | Digital caliper + micrometer |
| 3.00 mm – 6.00 mm | Batch ±10% | Digital caliper |
All tubes undergo 100% dimensional verification with traceable calibration. Each batch includes chemical and mechanical certification upon request.
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V. Surface Finish Options
| Finish Type | Ra Value | Application | Process |
|---|---|---|---|
| Bright Annealed | Ra ≤ 0.4 μm | General purpose, precision | Annealing in controlled atmosphere |
| Electropolished | Ra ≤ 0.2 μm | Pharmaceutical, semiconductor | Electrochemical polishing |
| Mechanical Polish | Ra ≤ 0.3 μm | Industrial, automotive | Mechanical buffing |
| Passivated | As-drawn | Corrosion critical | Nitric acid passivation per ASTM A967 |
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VI. Key Features & Advantages
| Feature | Specification | Benefit to Customer |
|---|---|---|
| Ultra-Fine OD | 1.50 mm outer diameter | Fits into compact assemblies and micro-instruments |
| Thin Wall Design | 0.25 mm wall thickness | Reduces weight while maintaining structural integrity |
| High Precision ID | 1.00 mm ±0.01 mm inner bore | Consistent fluid flow with minimal pressure variation |
| Corrosion Resistance | Excellent in oxidizing environments | Longer service life in harsh media |
| Corrosion resistance | ISO 10993 compliant | Suitable for implant-grade and precision instruments |
| Burr-Free Cutting | Laser / precision cut ≤ 0.05 mm burr | No secondary deburring required |
| Lot Traceability | Full material traceability | Complete QA documentation available |
| Custom Lengths | Cut to exact specification | Reduces waste and assembly time |
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VII. Typical Applications & Industry Use Cases
| Industry | Application | Why This Product Excels |
|---|---|---|
| Precision Instruments | Hypodermic tubing, stent delivery, catheter shafts | Precision ID ensures accurate fluid delivery; biocompatible surface minimizes tissue reaction |
| Analytical Instruments | HPLC columns, gas chromatography, microfluidics | Smooth ID reduces sample carryover; tight ID tolerance ensures reproducible results |
| Pharmaceutical Manufacturing | Dispensing tips, sampling needles, transfer lines | Non-reactive 316L surface maintains sample purity; electropolished option available for CIP/SIP |
| Semiconductor | Gas delivery lines, sensor probes, etching nozzles | Ultra-clean surface; electropolished finish minimizes particle entrapment |
| Aerospace & Defense | Hydraulic sensing lines, fuel injection, coolant paths | High strength-to-weight ratio; excellent fatigue resistance under vibration |
| Automotive | Fuel injector nozzles, EGR systems, brake sensing lines | Consistent ID ensures predictable flow rates; corrosion resistant to fuels and coolants |
| Chemical Processing | Catalyst injection, sampling ports, heat exchanger tubes | 304 SS resists a wide range of chemicals at elevated temperatures |
| Research & Development | Lab-on-a-chip, micro-reactors, experimental setups | Custom dimensions available; small batch quantities supported |
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VIII. CNC Machining & Fabrication Capabilities
| Fabrication Service | Capability | Tolerance |
|---|---|---|
| Precision Cutting | Laser cutting, abrasive cutting | ±0.01 mm |
| End Forming | Swaging, flaring, reducing, expanding | ±0.02 mm |
| Bending | CNC mandrel bending up to 180° | ±0.5° |
| Drilling / Perforation | Laser micro-drilling (0.05 mm min.) | ±0.005 mm |
| Welding | Orbital TIG, laser welding | Full penetration, no internal flash |
| Marking | Laser engraving, chemical etching | Permanent, legible |
| Cleaning | Ultrasonic cleaning, passivation | Per ASTM A967 / ISO 13485 |
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IX. Available Packaging & Shipping Options
| Packaging Type | Description | Best For |
|---|---|---|
| Bulk Pack | Polybag + carton box | Large quantity orders |
| Individual Sleeve | Heat-sealed PE sleeve per tube | Precision / cleanroom applications |
| Vacuum Sealed | Vacuum pack with desiccant | Long-term storage, sensitive components |
| Custom Kitting | Pre-sorted by length per kit | Assembly line ready |
Shipping: Worldwide via DHL, FedEx, UPS, or sea freight. Typical lead time: 7–15 working days for standard orders.
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X. Comparison: 304 vs Other Common Grades
| Property | 304 SS (This Product) | 304L SS | 316 SS | 321 SS |
|---|---|---|---|---|
| Corrosion Resistance | ★★★★★ | ★★★★ | ★★★★★ | ★★★★ |
| Weldability | ★★★★★ | ★★★★★ | ★★★★ | ★★★★ |
| Machinability | ★★★★ | ★★★★ | ★★★ | ★★★ |
| Cost Efficiency | ★★★★★ | ★★★★★ | ★★★ | ★★★ |
| High Temp Performance | ★★★ | ★★★ | ★★★★ | ★★★★★ |
| ID Surface Finish | Ra ≤ 0.4 μm | Ra ≤ 0.6 μm | Ra ≤ 0.4 μm | Ra ≤ 0.6 μm |
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XI. Quality Control & Certifications
| Inspection Stage | Parameter | Method | Frequency | Standard |
|---|---|---|---|---|
| Incoming | Material certification | Mill test report review | 100% per lot | EN 10204 3.1 |
| In-Process | OD / ID / WT | Laser micrometer | Continuous | ISO 2768 |
| Final | Full dimensional check | Vision + contact measurement | 100% | ISO 13485 |
| Surface | Defects, burrs, contamination | 10× optical inspection | 100% | ASTM A269 |
| Mechanical | Tensile, hardness | Universal tester | Per lot | ASTM E8 / E18 |
| Chemical | Composition verification | OES / ICP | Per lot | ASTM A751 |
| Pressure | Leak test | Air / hydrostatic | Per request | ASME B31.3 |
We provide Certificates of Compliance (CoC) with every order and Material Test Reports (MTR) upon request.
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XII. Why Choose Capillary Tubing Network?
| Advantage | What It Means For You |
|---|---|
| 15+ Years Experience | Deep expertise in micro-tubing manufacturing and precision cutting |
| ISO-Compliant Facility | Certified processes ensure consistent quality from batch to batch |
| Short Lead Times | Standard orders ship within 7–15 working days |
| Custom Manufacturing | OEM/ODM: we produce to your exact drawing and specification |
| Technical Support | Engineers available to help select the optimal grade and dimension |
| Global Shipping | Reliable logistics partners serving North America, Europe, and Asia |
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Request a Quote
Ready to order this 304 Stainless Steel Capillary Tube – 1.50mm OD x 1.00mm ID x 0.25mm Wall? Contact us today for pricing, lead time, and custom specification options. Our team will respond within 24 hours.
- Email: sales@capillarytubing.net
- Request a Quote: Click here to submit your inquiry
- Quote Reference: Please mention SKU CT-304-OD150-ID100-WT025 for faster processing
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Product SKU: CT-304-OD150-ID100-WT025 — Last Updated: 2026-05-21
Tags: micro stainless steel tube, stainless steel capillary tube, 304 capillary tube, 1.50mm OD tube, precision micro tubing, thin wall stainless steel tube, 304 stainless tube
