Stainless steel capillary tube is a small-bore precision tube used where controlled fluid or gas flow, compact routing, corrosion resistance, and dimensional consistency are required. Also referred to as stainless steel capillary, stainless capillary tube, SS capillary tube, or steel capillary tube, it is widely used in analytical instruments, laboratory equipment, refrigeration systems, medical-device components, and industrial control applications.
Unlike general-purpose tubing, a stainless steel capillary tube is commonly selected for its small inside diameter and controlled flow resistance. Tube material, inside diameter, wall thickness, length, and surface condition should be selected according to the medium, pressure, temperature, required flow rate, and installation environment.
Stainless steel capillary tubing combines the flow-control characteristics of a fine-bore tube with the mechanical strength and corrosion resistance of stainless steel. It can be supplied to match specific dimensional and processing requirements.
Precise flow control: The small internal passage helps regulate, restrict, sample, or direct liquid and gas flow in controlled systems.
Small-diameter tubing options: Stainless steel capillary tube sizes are commonly specified by outside diameter, inside diameter, wall thickness, and length. Tight dimensional requirements should be stated in the purchase specification.
Corrosion-resistant material: Stainless steel is suitable for many laboratory, industrial, and moisture-exposed environments. A 304 stainless steel capillary tube is a common option for general corrosion-resistance requirements; the final grade should be selected according to the working medium and service conditions.
Suitable for compact equipment designs: Fine-diameter metal capillary tube products can be routed through space-limited equipment, instruments, and assemblies.
Surface and fabrication options: Depending on the required grade and dimensions, tubing may be supplied with specified surface conditions and prepared for cutting, coiling, bending, welding, or connection.
Project-specific supply: As stainless steel capillary tube suppliers, KIDY can quote according to the required grade, dimensions, length, quantity, surface condition, and applicable technical specifications. Buyers evaluating steel tube manufacturers in china can submit drawings or detailed tube requirements for a tailored quotation.
Stainless steel capillary tubes are used in equipment and systems that require precise fluid or gas routing, flow restriction, sampling, or measurement.
Typical applications include:
Refrigeration and air-conditioning capillary systems
Laboratory and analytical instruments
Gas chromatography and sample-transfer systems
Pressure measurement, flow measurement, and control devices
Medical-device and diagnostic-equipment components
Heat-transfer and temperature-sensing equipment
Fuel, lubrication, and compatible fluid-control systems
Chemical processing and instrumentation lines
Optical, scientific, and precision-engineering equipment
For medical, food-contact, high-purity, or corrosive-fluid applications, the material grade, surface condition, cleanliness, and compatibility requirements should be confirmed for the final use.
Stainless steel capillary tube sizes vary by outside diameter, inside diameter, wall thickness, length, coil or straight form, and dimensional tolerance. When requesting a quotation, provide the following details:
| Ordering Item | Information to Provide |
| Material | Required stainless steel grade, such as 304 or another specified grade |
| Dimensions | Outside diameter, inside diameter, and wall thickness |
| Length | Straight length, coil length, or cut-to-length requirement |
| Surface condition | Required internal and external finish or cleanliness level |
| Tolerance | OD, ID, wall thickness, length, and straightness requirements |
| Working conditions | Medium, pressure, temperature, and corrosion environment |
| Processing | Coiling, cutting, bending, end preparation, or other fabrication requirements |
| Quantity | Required order quantity and delivery schedule |
| Documentation | Inspection, testing, marking, and material-certificate requirements |
Stainless steel capillary tube price depends on the material grade, dimensions, wall thickness, tolerance, surface finish, processing, testing requirements, and order quantity. Contact KIDY with your specification to receive a project-specific quotation.
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