Stainless Steel Capillary Tube Manufacturer & Exporter
If you have ever had a batch of micro-tubing mess up a job, you know how annoying it gets. A wall that is a fraction of a millimeter off, a rough inside bore, or a tiny pinhole leak can shut down an entire skid or throw off sensor readings. At our plant in Mumbai, we draw small-diameter, thin-wall tubing built to your exact technical prints so your builds stay on schedule.
We operate as a direct stainless steel capillary tube manufacturer, not a trader re-selling inventory. We cold draw both seamless SS capillary tubes and welded tubing based on the actual pressure ratings, fluid types, and heat levels your setup handles. Whether you need straight lengths cut clean and deburred or continuous spools to cut down on extra joints, our shop handles drawing, trimming, end prep, and testing under one roof.
Technical Data
Precision Tubing Specifications & Material Grades
Every job throws something different at your lines. Hydraulic circuits need thick walls to take pressure spikes, while marine gear and chemical skids need alloys that will not pit in saltwater or harsh acids. We keep raw mother hollows stocked in multiple grades so we can put your order on our draw benches without long delays.
Technical Specifications
| Parameter | Standard Range / Specification |
|---|---|
| Outer Diameter (OD) | 0.30 mm up to 12.00 mm |
| Wall Thickness (WT) | 0.08 mm up to 2.00 mm |
| Inner Diameter (ID) | Custom microbore dimensions sized for smooth, steady flow |
| Supply Formats | Cut straight lengths up to 6 m or continuous spools up to 500 m |
| Surface Finish | Bright annealed, acid pickled, or electro-polished |
| Manufacturing Standards | ASTM A269 Seamless Tubes & ASTM A213 Seamless Tubes |
Material Selection Guide
| Alloy Grade | Key Performance Characteristics | Common Industrial Uses |
|---|---|---|
| SS 304 / 304L | Good strength, easy bending, and practical rust protection without inflating costs. View our Stainless Steel 304L Pipes & Tubes. | General industrial instrumentation, sensing bulbs, automotive lines. |
| SS 316 / 316L | Alloyed with molybdenum to stop pitting, crevice corrosion, and chloride attack. View our Stainless Steel 316 Pipes & Tubes. | Chemical processing skids, offshore setups, medical gear. |
| Specialty Alloys | Custom runs in Grade 321, 347, 310S, and Duplex steel for heavy heat or vibration. | High-temp furnaces, aerospace impulse lines, power plants. |
Secondary Formats & Product Options
Because no two piping layouts are laid out the same way, we supply several practical formats:
- SS 316L Capillary Tubing: A solid fit for medical devices, lab instruments, and marine setups where low carbon levels stop corrosion around weld points.
- Micro Bore Stainless Steel Tubes: Cold drawn with tight inner dimensions to meter small fluid flows in chromatography columns and test gear.
- Coiled Capillary Tubing: Long continuous runs that let you route gas or liquid over long distances without adding extra leak points.
- Bright Annealed Capillary Tubes: Heat treated in a protective furnace so both inner and outer walls stay clean, smooth, and scale-free. For welded needs, check ourASTM A269 Welded Bright Annealed Stainless Steel Tubing.
- High Pressure Capillary Tubing: Built with heavy walls and small inner bores to handle intense hydraulic or gas force without bulging.
Where Our Tubing Gets Used
- Medical Devices: Biopsy needles, surgical tools, fluid sampling probes, and dosing lines.
- Control Systems: Thermocouples, pressure sensor leads, thermostat bulbs, and impulse lines.
- Labs & Testing: Chromatography columns and precise liquid dosing feeds.
- HVAC & Cooling: Evaporator coils, expansion valves, and metering tubes.
- Automotive & Aerospace: Micro fuel rails, hydraulic lines, and sensor pockets.
Quality Inspection & Testing
When you are working with micro tubing, a tiny burr or a thin spot in the wall will ruin flow rates or give wrong pressure readings. Before anything gets boxed up, our shop team runs tests on every batch:
- Hydrostatic and air-under-water testing to catch pinhole leaks.
- Eddy current scans to catch hidden cracks or flaws inside the tube wall.
- Optical microscope checks to verify exact OD, ID, and wall roundness.
- Flare, flatten, and bend tests to make sure the temper fits your shop tooling.
- PMI chemical checks on every heat lot to confirm exact alloy content.
Why Buy From Amardeep Steel?
Because we run the process from raw billet selection through to final crates, you get straight answers on lead times, genuine mill test reports, and consistent wall quality across every lot. Delicate micro tubing gets bent easily during transit, so our packaging crew ships straight runs in thick PVC pipes or heavy wooden crates with end supports so everything arrives ready for assembly.
If you want to see our shop setup or learn more about our business, visit ourAbout Us page.
Frequently Asked Questions
What is the real difference between seamless and welded capillary tubes?
Seamless tubing starts as a solid steel bar that gets hot-pierced and drawn down. With no weld line, it handles extreme pressures, HPLC setups, and medical devices much better. Welded tubing is rolled from flat strip and welded down the seam, making it a cost-effective choice for basic temperature sensors and standard plumbing runs.
Can you draw non-standard wall sizes or custom outer diameters?
Yes. We set up custom cold drawing schedules to client drawings all the time. Send over your target OD, ID, and tolerances, and our shop foremen will map out a draw run for your order.
How do you keep long, thin capillary tubes from bending during shipping?
Straight lengths go into heavy PVC piping or wooden boxes fitted with inner end collars. For coiled tubing orders, we pack the spools tightly with protective wrapping so they arrive without crushed edges.
Get a Fast Quote
Need a dependable stainless steel capillary tube manufacturer for your next order? Send us your sizes, required quantities, and material grades, and our sales team will get back to you with clear factory pricing.
- Email: sales@amardeepsteel.com
- Phone: +91 22 67439130 / +91 22 67439165
- Factory Address: Sanghrajka House, 2nd Floor, Office No 10, Opera House, Mumbai 400004, Maharashtra, India
