Stainless steel capillary tubes are very thin stainless steel tubes, resembling metal straws. Wall thickness can be as thin as 0.05mm, and diameters are extremely small. They are supplied in straight bars or coils. Various grades are available, including 304, 316, 310S, and 321, with a bright and clean surface.
Glory Steel is a premium manufacturer of stainless steel capillary tubes. We specialize in producing various precision stainless steel tubes with small tolerances. Wall thickness and outer diameter can be customized, suitable for biochemical, commercial, and other applications.
Features
- Superior Rust Resistance – Chromium content protects it from corrosion by air, moisture, and oxidizing media under a protective oxide film.
- High and Low Temperature Resistance – Unaffected by ambient temperature; it will not deform whether below freezing or above 1000 degrees Celsius.
- High Strength & Flexibility – It can easily pass through or be deployed in complex and confined spaces without causing blockages.
- High Cleanliness – Food-grade hygiene, tolerant of pH 1-14, with no impurities adsorbed on the inner and outer walls, suitable for high-purity environments.
- Electromagnetic Shielding – Resistant to signals and electromagnetic interference, effectively protecting electronic equipment for normal operation.
Specification
| Item | Stainless steel precision tubes |
| Material | 304 / 304L / 316 / 316L / 321 / 310S |
| Process | Welded, Seamless |
| OD | 0.2mm – 8mm |
| WT | 0.05 mm – 2.0 mm |
| Length | 1000mm, 2000mm, 3000mm, etc. |
| Standard | ASTM A269, A213, A632, ISO 9001 |
| Applicable Temperature | -270℃ ~ 850℃ |
| MOQ | 10 tons |
| Surface Treatment | BA/EP/Polishing/Acid Pickling |
Shape and supply method
Slender cylindrical tubes are also available, along with square, hexagonal, and other irregular cross-sections. Customizable options include free-bending, straight, and coiled types.
Glory Steel supports flexible length cutting and custom cross-section customization to meet specific needs.
Classification of stainless steel capillary tubes
Common Material Classifications
- 304/304L Capillary Tubes – The most widely used material grade, suitable for various working conditions, and low cost.
- 316/316L Capillary Tubes – Based on 304, molybdenum is added for improved rust resistance, making them suitable for use in seawater and biochemical applications.
- 321 Capillary Tubes – Contain titanium, suitable for environments requiring welding and long-term medium-to-high temperatures.
- 310S Capillary Tubes – Continuous operating temperature up to 1150℃, outstanding temperature resistance, suitable for use as high-temperature furnace tubes.
Surface treatment classification
- Polished Surface – Mirror-like finish, low roughness, enhancing texture.
- BA – Bright Annealed, the most common type, bright metallic luster, suitable for general applications.
- EP – Electrolytically polished, lower roughness than ordinary polishing, Ra≤0.2μm, ultra-smooth surface.
- Pickled Surface – Passivated after acid pickling, grayish-white, relatively rough, allows for further processing.
Process Classification
- Seamless capillary tubes – made by perforating stainless steel round bars, commonly used in needles, precision, and high-pressure tubing.
- Welded capillary tubes – made by coiling and welding stainless steel strips, easy to manufacture, relatively low cost, used for general fluid tubing.
Application
Main applications in precision tubing:
- Medical – Needles, in-vitro diagnostic equipment, surgical catheters, dental turbine tubing.
- Refrigeration and home appliances – Thin metal tubing for coffee and milk tea machines, air conditioning ducts.
- Industrial – Thin tubing for temperature control equipment, hydraulic lines, heating elements, automotive antennas, watch parts.
- Others – Brake fuel injection lines, antenna sleeves, tubing for transporting corrosive chemical fluids.
FAQ
1. Can I purchase mixed batches of different specifications?
Mixed batches are supported. A total order quantity of 10 tons is sufficient. The more you order, the greater the discount.
2. What is the lead time for custom-made square, hexagonal, and rectangular capillary tubes?
The delivery time for standard round tubes is 12-16 days, and for custom-made precision tubes, it’s 18-22 days.
3. What surface treatment and material are recommended for medical-grade applications?
Polishing, especially electropolishing, is recommended to avoid impurity residue. 316 or 316LL material is recommended.
4. Does the product support third-party testing, such as SGS?
Yes! You can arrange for a third-party authoritative institution to conduct testing, such as chemical composition testing, salt spray testing, and dimensional measurement.
5. What material should I choose if I need to use it at temperatures above 600℃?
310S is preferred, as it maintains excellent oxidation resistance even at high temperatures.
Why Choose Glory Steel?
- Factory Direct Supply – All stainless steel round bars and strips are sourced directly from our factory, eliminating intermediaries and significantly reducing your costs.
- Customization Service – We support customization of all sizes, cross-sectional shapes, packaging methods, and coatings to perfectly suit your projects.
- Quality Control – Our products meet international standards such as ASTM and ISO, and undergo corrosion and pressure resistance tests before leaving the factory.
- Timely Delivery – Ample production capacity, standardized export packaging, and extensive export experience ensure on-time shipments.
Glory Steel factory, located in Tianjin, China, is an ISO 9001, ISO 14001, and CE certified factory with an annual output of 100,000 tons. We specialize in manufacturing Stainless Steel Coiled Tubing, Stainless Steel Seamless Pipe, Precision Bright Annealed Tube, and Sanitary Stainless Steel Pipe. With our high-quality products and services, we export to over 120 countries.
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