Stainless Steel Micro Tubes are very carefully crafted Tubes designed for extremely small diameters and thin walls with great tolerances. These tubes are available in various grades of material and some of the most common are SS 304, 304L, 316 and 316L, which provide good corrosion resistance, better ductility and strength. The interior of these tubes is treated according to the different international standards to assure smooth interior surfaces and good fluid flow performance. Stainless steel micro tubes are seamless or welded with various custom sizes and finishes, and are a popular choice for precision manufacturing when reliability is required. USA Piping Solution is a trusted name in the SSTubes industry as a Stainless Steel Micro Tubes Manufacturer & Supplier, providing high-quality micro tubes to international standards and customer-specific requirements with reliable quality and performance.
Specifications of Stainless Steel Micro Tubes
| Specification Attribute | Details |
|---|---|
| Outer Diameter (OD) | Typically 0.008” to 0.250” (0.2 mm to 6.35 mm). Smaller/larger micro sizes and SS miniature tubing may be produced on request. |
| Wall Thickness (WT) | Typically 0.002” to 0.040” (0.05 mm to 1.0 mm). Thin wall stainless steel micro tubing is a specialty. |
| Length | Straight lengths (e.g., 1m, 2m, custom up to ~45ft) and Coils (up to ~3200ft for continuous runs, e.g., Capillary stainless steel tubes). |
| OD Tolerance | Standard: +/-0.005” (+/-0.13mm). Tighter tolerances achievable for Precision stainless steel micro tubes. |
| Wall Tolerance | Standard: +/-10%. Tighter tolerances available upon request. |
| Manufacturing Process | Primarily Seamless (Cold Drawn); Welded & Redrawn options available for certain sizes/applications. |
| Common Grades | SS 304 micro tube, SS 304L micro tube, SS 316 micro tube, 316L micro tube. Other grades on request. |
| Surface Finish | Bright Annealed (BA), Mechanical Polished (e.g., 32Ra OD / 20Ra ID or custom), Passivated, Electropolished. |
| End Finish | Plain End (PE, cleanly cut & deburred), Bevelled End (BE, less common for micro), Custom ends (e.g., chamfered, radiused). |
| Material Condition | Annealed (soft), 1/4 Hard, 1/2 Hard, Full Hard, or as per customer specification. |
| Applicable Standards | ASTM A269, ASTM A632 (instrumentation), ASTM A270 (sanitary aspects if applicable), or custom specifications. |
| MTC | EN 10204 3.1 Mill Test Certificate provided with all shipments. |
| Origin | High-quality European, Japanese, or Korean origin raw materials, as per customer requirement and availability. |
Types of Stainless Steel Micro Tubes
Stainless Steel 304 Micro Tubing / 304L Micro Tubing
SS 304 Micro Tube / 304L Micro Tube is the most widely used austenitic stainless steel, valued for its good general corrosion resistance, excellent formability, and reliable strength. The lower carbon content in the "L" grade enhances weldability, making it a versatile choice for general instrumentation, food and beverage components, automotive parts, and consumer electronics where moderate corrosion resistance is sufficient for SS micro tubes.
Small Diameter Stainless Steel 316 Tubing / 316L Micro Tubing
SS 316 Micro Tube / 316L Micro Tube is an austenitic stainless steel alloyed with molybdenum, delivering excellent corrosion resistance, especially against chlorides and acidic environments. The low carbon "L" grade (316L micro tube) offers improved weldability, making Stainless steel 316 micro tubing ideal for demanding applications such as medical devices, pharmaceutical processing, marine components, chemical lines, and analytical instrumentation requiring superior corrosion resistance in Small diameter stainless steel tubing.
Applications and Industrial Uses of Stainless Steel Micro Tubes
- Renewable Energy Industry
- Pulp and Paper Industry
- Process Piping Industry
- Food and Beverage Industry
- Food and Beverage Industry
- Oil and Gas Industry
- Mining Industry
- Water/Waste Industry
- Marine Industry
Frequently Asked Questions
1. What is a stainless steel micro tube, and how small can the diameter go?
A stainless steel micro tube is a precision tube with very small diameters and thin walls used in compact systems. Depending on the application, the outer diameter can be as small as 0.2 mm to 0.3 mm.
2. Is stainless steel micro tube seamless or welded, and which is better for my use case?
Stainless steel micro tubes are available in both seamless and welded forms. Seamless tubes are preferred for high-pressure and critical applications, while welded tubes are more economical for general precision use.
3. How is stainless steel micro tube manufactured?
Stainless steel micro tubes are manufactured using precision cold drawing, rolling, and finishing processes to achieve tight tolerances, smooth surfaces, and accurate dimensions.
4. What sizing/gauge system is used for micro tube dimensions?
Micro tube dimensions are usually specified by outer diameter (OD), inner diameter (ID), and wall thickness, typically measured in millimeters or inches.
5. Are stainless steel micro tubes biocompatible for medical implants?
Yes. Certain grades such as SS 316L micro tubes are widely used in medical and surgical applications because of their biocompatibility, corrosion resistance, and ease of sterilization.