ASTM A269 TP304 Seamless Stainless Steel Capillary Tube for Instrumentation and Industrial Heating

ASTM A269 TP304 seamless stainless steel capillary tubes are small-diameter tubes designed for applications requiring controlled tube dimensions, corrosion resistance, and reliable material performance. Manufactured from TP304 austenitic stainless steel, these tubes are used in instrumentation, industrial heating assemblies, and various precision equipment.
The seamless construction provides a continuous tube wall without a longitudinal weld seam. For capillary tubing, outside diameter, wall thickness, dimensional tolerances, surface condition, and straightness are important purchasing considerations, particularly when the tubes are incorporated into compact equipment or precision assemblies.
YUHONG supplies TP304 seamless stainless steel capillary tubes according to specified dimensions, lengths, material requirements, and inspection conditions.

Actual dimensional ranges and tolerances are subject to confirmed supply capability and the agreed product specification.

TP304 is a widely used chromium-nickel austenitic stainless steel grade. It offers general corrosion resistance and good formability for a broad range of industrial applications.

Seamless manufacturing eliminates the longitudinal weld seam found in welded tubing. This construction may be specified where seamless tubing is required by the equipment design or purchase specification.

Capillary tubes require attention to dimensional consistency, wall thickness, and surface quality. These parameters influence installation, fluid passage, and the performance of the final assembly.

• Industrial electric heating assemblies
• Instrumentation and measuring equipment
• Temperature and pressure sensing components
• Precision fluid transfer systems
• Laboratory and analytical equipment
• Industrial machinery and compact equipment

The final material and dimensional selection should be based on the operating medium, temperature, pressure, and equipment design.

Capillary tubes can be specified according to the following parameters:

• Outside diameter (OD)
• Wall thickness (WT)
• Inside diameter (ID), where specified
• Tube length and cutting tolerance
• Straightness and ovality requirements
• Surface finish and cleanliness
• Material grade and applicable standard
• Testing and inspection requirements

For an accurate quotation, please provide the required tube dimensions, quantity, application, and technical specification.

Inspection requirements should be confirmed according to the applicable ASTM A269 specification, tube dimensions, and purchase order.
Typical inspection items may include:

• Material identification and heat-number traceability
• Chemical composition verification
• Dimensional inspection of OD and wall thickness
• Visual inspection of internal and external surfaces
• Hardness and mechanical testing where applicable
• Hydrostatic or nondestructive electric testing as applicable to the specification and product dimensions

Additional testing requirements should be agreed before order placement. For very small-diameter capillary tubes, applicable testing provisions and acceptance criteria need particular attention.

Stainless steel capillary tubes should be protected against bending, crushing, contamination, and surface scratches during handling and transportation.
Typical packaging options include plastic sleeves, protective wrapping, bundled packing, and export-standard wooden cases. Suitable end protection and internal separators can be used according to tube dimensions and shipping requirements.