Precision seamless steel tubes are manufactured by cold drawing and/or cold rolling processes, delivering high dimensional accuracy, consistent wall thickness, and a smooth surface finish. Compared with hot finished seamless tubes, precision tubes offer tighter tolerances and improved uniformity, making them suitable for a wide range of industrial applications.
Product Characteristics
Cold drawn / cold rolled production process
Excellent dimensional accuracy and concentricity
Tight control of outer diameter and wall thickness
Smooth internal and external surface quality
Stable mechanical properties and good machinability
Dimensional Tolerances
Tolerance class: H8 / H9 (H10 available upon request)
Outer diameter tolerance: down to ±0.05 mm (depending on size)
Wall thickness tolerance: ±7.5%
Ovality: ≤ 50% of OD tolerance
Straightness: ≤ 1/1000
Surface Quality
Cold drawn condition: Ra ≤ 0.8 μm
Higher surface finish available upon request
Delivery Condition
+SR (Stress Relieved)
+BK (Cold Finished, Hard)
+NB (Normalized)
Applicable Standards
EN 10305-1 (E355)
DIN standards
GB/T 3639
JIS standards
Typical Applications
General machinery and equipment manufacturing
Hydraulic and pneumatic systems
Automotive and transportation components
Precision mechanical parts
Industrial structures and engineering projects
Tags: Precision seamless tube, Cold drawn precision tube, H8 / H9 tolerance required, Hydraulic tube EN 10305 E355 + SR,
