Thin Wall 304 Stainless Steel Seamless Tube Precision Instrumentation Bright Annealed

Thin wall 304 stainless steel seamless tube is a precision instrumentation grade produced to ASTM A269 for fluid transfer, measurement and control systems where dimensional accuracy and a clean bore are essential. The tube is cold drawn over a mandrel and finished in the bright annealed condition, giving a mirror bright inner and outer surface, tight concentricity and a smooth bore that resists fouling and supports stable flow. Wall thickness from 0.5 mm to 3.0 mm keeps weight and cost low without compromising pressure capability.

Because the tube is seamless, it eliminates the weld seam and bead that can trap particles or create a corrosion path in critical circuits. Outer diameter is held to within plus or minus 0.05 mm and wall thickness within 10 percent, so the tube seats reliably in compression fittings and instruments. Every length is straightened, cut to a clean square end and eddy current tested, then cleaned and capped before packing. The result is a dependable, repeatable component for instrumentation, hydraulic and high purity fluid systems in demanding industries.

• Thin Wall Lightweight Design: Wall thickness from 0.5 mm to 3.0 mm reduces weight, material cost and installation effort while preserving pressure rating.
• Precision Instrumentation Grade: Cold drawn to ASTM A269 with tight tolerances for use in measurement, control and fluid transfer circuits.
• Bright Annealed Surface: A bright, passivated inner and outer surface resists corrosion and contamination in high purity systems.
• Seamless Smooth Bore: No weld seam or internal bead, ensuring unrestricted flow and reliable seating in compression fittings.
• Tight Dimensional Tolerance: Outer diameter held to plus or minus 0.05 mm for consistent fit and repeatable assembly.
• Tested and Traceable: Every length is straightened, eddy current tested and supplied with mill test certificates for full traceability.

This thin wall seamless tube is designed for instrumentation and control lines, hydraulic and pneumatic systems, gas analysis and sampling circuits, medical and laboratory equipment, semiconductor process gas delivery, and high purity fluid transfer in food and pharmaceutical plants. Its combination of tight tolerance, smooth bore and bright finish suits applications where contamination, leakage or measurement error cannot be tolerated. The tube can be bent, flared and welded by standard techniques, making it easy to fabricate into compact and reliable assemblies.

Straight lengths are individually capped, wrapped in protective sleeving and packed in sturdy wooden boxes to prevent bending and surface damage during transport. Each bundle is labelled with grade, dimension, heat number and quantity for traceability. Mill test certificates, dimensional inspection reports and third party inspection are available on request, and our ISO 9001 certified process ensures lot to lot consistency. Cutting, deburring, passivation and custom finishing services are offered to match your drawing requirements.