SS Capillary Tube Supplier in India — Precision OD 0.5-6mm

SS capillary tubing is ultra-small-diameter seamless tubing typically ranging from 0.5mm to 6mm OD with very thin walls (0.1-1.5mm). It is manufactured to extremely tight dimensional tolerances and smooth internal surfaces, making it ideal for precision fluid transfer in analytical instruments, medical devices, thermocouples, and chromatography columns. The small bore creates controlled flow characteristics essential for micro-volume applications.

SS capillary tubes serve critical roles in HPLC and gas chromatography systems, medical device assemblies such as needles and catheters, thermocouple sheaths for temperature measurement, pressure gauge connections, semiconductor gas delivery, analytical sampling systems, and micro-chemical reactors. The combination of corrosion resistance, dimensional precision, and biocompatibility makes stainless capillary tubing indispensable in these fields.

We supply capillary tubing with OD tolerances as tight as plus or minus 0.02mm and wall thickness tolerances of plus or minus 10 percent or 0.05mm (whichever is greater). Internal diameter concentricity is maintained within 0.03mm TIR. For HPLC and medical applications, we can supply tubing with ID tolerance of plus or minus 0.01mm. These tight tolerances ensure consistent flow rates and reliable connections in precision assemblies.

Yes. We supply 304L and 316L capillary tubing meeting ASTM A269 and ASTM F899 requirements for medical device applications. Tubes are available with bright-annealed or electropolished internal finish for biocompatibility. We can supply tubing with material certificates including full chemical analysis, mechanical properties, surface roughness measurements, and cleanliness verification. Custom cutting to precise lengths with burr-free ends is available.

Capillary tubing is generally defined as OD below 6mm with very thin walls, manufactured to tighter tolerances and smoother finishes than standard instrumentation tube. Instrumentation tubing (per ASTM A269) typically starts at 6.35mm OD and serves hydraulic, pneumatic, and process sampling functions. Capillary tubes are precision products designed for micro-volume flow control while instrumentation tubes handle higher volumes at standard industrial tolerances.

Yes. We supply SS capillary tubing in both straight cut lengths and continuous coil form. Coil lengths range from 10 metres to 500 metres depending on OD. Smaller diameters (0.5-2mm OD) can be supplied in coils up to 500m, while larger capillary sizes (3-6mm OD) are available in coils up to 100m. Coils are wound on plastic spools or wooden drums to prevent damage during transport. Straightened and cut lengths available from 100mm to 6000mm.