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Stainless steel capillary tubing is a precision-engineered product with extremely narrow inner diameters (0.5–6.35 mm) and wall thicknesses (0.1–1.0 mm), designed for applications requiring precise fluid/gas conveyance and miniaturized systems. Manufactured from grades like 304, 316L, and 310S via cold-drawing or micro-extrusion, it offers exceptional dimensional accuracy (±0.01 mm tolerance) and surface finish (Ra ≤ 0.8 μm). Compliant with standards like ASTM A269, ASME SA269, and ISO 1127, capillary tubing balances mechanical strength with geometric precision.
The seamless construction eliminates weld defects, ensuring leak-free performance even under high pressure (up to 20,000 PSI) or vacuum conditions. Its corrosion-resistant austenitic microstructure makes it suitable for both aggressive media and high-purity environments.
Precision Dimensional Control: Offers tight OD/ID tolerances for use in microfluidic devices, analytical instruments, and medical catheters.
High Pressure & Vacuum Resistance: Maintains structural integrity under extreme pressures (e.g., HPLC systems) and low-pressure vacuum applications (e.g., mass spectrometers).
Superior Corrosion Resistance: Available in grades like 316L (for seawater/chlorides) and 310S (for high-temperature oxidation), ensuring compatibility with diverse media.
Surface Finish Options: Polished (Ra ≤ 0.2 μm) for biocompatibility in medical use or passivated for enhanced corrosion resistance in chemical analysis.
Medical Devices: Used in insulin pumps, angiographic catheters, and minimally invasive surgical tools, meeting ISO 10993 biocompatibility standards.
Analytical Instruments: Ideal for gas chromatography (GC) columns, liquid chromatography (HPLC) capillaries, and sensor tubing requiring low dead volume and chemical inertness.
Aerospace & Defense: Employed in aircraft fuel systems, hydraulic lines, and missile guidance components for lightweight, high-strength fluid control.
Industrial Automation: Used in precision lubrication systems, pressure transducers, and robotic arm hydraulics requiring compact, reliable tubing.
End of Pipe and Tube
Ply Wooden Boxes
PE Fabric Bundles
Standard seaworthy export packing
Plastic Bags, or as required
Marking
Supplier / Manufacturer Name or Custom Logo - on request
Specification
Material Grade
Nominal Size
Schedule or Wall Thickness
Method of Manufacturing (Seamless or Welded)
Heat Number
Marked Pipe Sample: XTD ASTM B167 UNS N06601 SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15
Packing
Ply Wooden Boxes
PE Fabric Bundles
Standard seaworthy export packing
Plastic Bags, or as required
Delivery Condition
Pickled&Annealed, Polished, Bright Annealed.
All tubes shall be supplied as per applicable ASTM B163 /B426
Mill test certificates will be issued
We can provide 3.2 Certification according to the needs of you
Q: What materials are commonly used for capillary tubing?
A:304 (general purpose), 316L (chloride resistance), 310S (high-temperature), and specialty alloys like Inconel 625 for extreme environments.
Q: Can capillary tubing be bent without kinking?
A:Yes, when cold-worked properly; mandrel bending or heat treatment can improve formability, though wall thickness <0.3 mm requires extra care.
Q: How is leakage tested for such small diameters?
A:Helium mass spectrometry or pressure decay testing is standard, ensuring leak rates <1×10⁻⁹ mbar·L/s for critical applications.
Q: What connection methods are used for capillary tubing?
A:Compression fittings (e.g., Swagelok), flare fittings, or laser welding; adhesive bonding for non-pressure applications.