Description

Capillary Tubes : Specifications | Types | Size Chart | Pressure Rating | Dimensional Tolerances Premium Quality Capillary Tubes in SS, Hastelloy, Inconel & Titanium – ASTM B165, B163, B338 Certified. Sizes from 0.3mm OD with Ultra-Thin Wall Thickness. Ideal for High-Precision, Corrosion-Resistant Applications in Pharma, Lab & Gas Distribution Systems. Supplied with MTC & Third-Party Inspection on Request. Capillary Tubes are small-diameter tubes with thin walls, designed to carry fluids with precision under controlled flow conditions. These tubes are typically manufactured using high-quality stainless steel, copper, or other non-ferrous materials, and are produced through cold-drawing and annealing processes to achieve tight dimensional tolerances and a smooth internal surface. The manufacturing process ensures a consistent inner diameter and uniform wall thickness, which is critical for accurate fluid transfer in sensitive systems. Technically, capillary tubes are available in outer diameters ranging from 0.5 mm to 6 mm, with wall thickness as low as 0.1 mm, and are often supplied in coil or straight length form. They comply with international standards such as ASTM A269, A213, A632 (for stainless steel) and ASTM B280 (for copper). These tubes are manufactured in grades like SS 304, 304L, 316, and 316L, offering high corrosion resistance and excellent mechanical properties. Surface finishes can range from bright annealed to polished, and tolerances are maintained to ±0.01 mm for critical applications. Capillary tubes are widely used in medical instruments, refrigeration systems, pressure measuring devices, chemical processing, analytical instruments, and gas chromatography equipment. In refrigeration and air conditioning systems, capillary tubes function as expansion devices…