Capillary Tube

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Steelage Alloys offers precision-manufactured Stainless Steel Capillary Tubes, known for their ultra-fine dimensions, corrosion resistance, and consistent performance in critical applications. These tubes are designed for precise fluid and gas flow, making them ideal for industries such as medical instrumentation, chromatography, thermocouples, hydraulics, and chemical processing.

Crafted from high-grade stainless steel (typically SS 304, 304L, 316, 316L), our capillary tubes are available in various diameters and wall thicknesses to suit highly specific application needs. Each tube is produced under strict quality control to ensure a smooth internal surface, accurate dimensions, and exceptional purity, ensuring reliable performance even in high-pressure or high-temperature environments.

Corrosion Resistant

Trusted Supplier

Bulk Orders

Features

  • Ultra-Fine Diameter & Tight Tolerances
  • Excellent Corrosion & Oxidation Resistance
  • Clean, Smooth Internal Surface for Precise Flow
  • High Strength with Lightweight Design
  • Performs Well Under High Pressure & Temperature
  • Ideal for Medical, Laboratory & Analytical Equipment
  • Available in Various Grades (304, 316, etc.) & Sizes
  • Meets International Standards (ASTM, DIN, JIS)

Specifications

  • Outer Diameter: Φ0.4-Φ16.0mm (Minimum - Maximum)
  • Wall Thickness: 0.1-2.0mm (Minimum – Maximum)
  • Length: 18000mm (Maximum)
  • Customised size needs to be confirmed with us

Standards

  • American Standard: ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790
  • European Standard: DIN 17457
  • Japanese Standard: JIS G3459
  • GB Standard: GB/T12770-2002, GB/T12771-2008

Applications

  • Automation instrument line
  • Wire protection tube
  • Inner support of high-voltage cable
  • Petroleum
  • Food machinery
  • Medical needles
  • HPLC systems
  • Pressure gauges
  • Thermocouples
  • Gas chromatography
  • Hydraulic control lines
  • Anesthesia gas delivery
  • Fuel injection systems
  • Chemical sampling lines
  • Leak detection systems

Manufacturing Process

Capillary Tube

hastelloy round bar

Strip

Cut to Length

Inspection

Analytic

Analytic

Heating

Auto-welding

Heating

Welding Cleaning

Perforation

Seam-grinding

Inspection of Size

Degreasing

Pickling

Curing Heat Treatment

Lubricating

Eddy Current Testing

Cold Drawing (Cold Rolling)

Straightening

Degreasing

Cutting

Annealing

Chemical Cleaning

Straightening

Capillary Tube

Cut

Passivating

Pickling / Passivating

DI Water & N2 Purging

Pickling / Passivating

Polishing

Inspection

Inspection

Analytic

Analytic

Marking

Marking

Packing & Shipping

Packing & Shipping

Drawing & Formula

Formula: m = (OD - THK) × THK (mm) × L (m) × 0.02491
* For 316, 316L, 310S, 309S, etc., ratio=0.02507 OD = Outer diameter, THK = Wall Thickness, L = Length

Package

Plastic Bag

Wooden case

Logistics

By Sea

By Air