Cold Drawn Precision Seamless Steel Tube – Hydraulic & Machinery Grade
Product Overview
Cold-drawn precision seamless steel tube is a high-accuracy dimensional product manufactured by cold drawing and finishing processes. With tight dimensional tolerances, smooth surface finish and uniform wall thickness, it is the ideal material for precision machinery, hydraulic systems and automotive components. This grade eliminates the need for extensive secondary machining, reducing production cost and improving assembly accuracy for high-volume manufacturing.
Why Choose CNB Precision Seamless Tube?
Our precision seamless tubes are produced on dedicated cold-drawing lines with strict process control over dimensional accuracy, surface quality and mechanical properties. Every tube undergoes full dimensional inspection and surface defect inspection to ensure compliance with precision standards. We offer various finishing options including honing, burnishing and heat treatment to match your exact application requirements.
Key Specifications
| Item | Specification |
|---|---|
| Product Name | Cold Drawn Precision Seamless Steel Tube |
| Steel Grade | 10# / 20# / 45# |
| Manufacturing Process | Cold drawn / cold rolled seamless |
| Outer Diameter Range | 4mm – 89mm |
| Wall Thickness Range | 0.5mm – 12mm |
| OD Tolerance | H9 (standard) / H8 (high precision) |
| ID Tolerance | H8 (standard) / H7 (high precision) |
| Standard Lengths | 3m – 6m, custom cut |
| Surface Finish | Bright cold-drawn, honed, burnished option |
| Applicable Standards | GB/T 3639, EN 10305, DIN 2391 |
| Inner Surface Roughness | Ra ≤ 0.8μm (honed grade) |
Core Advantages
- Ultra-precise dimensions: Tight OD and ID tolerances for direct assembly without secondary machining.
- Smooth surface finish: Excellent inner and outer surface quality for hydraulic and moving component applications.
- Uniform wall thickness: Precise wall centricity ensures even stress distribution.
- Dimensional stability: Stress-relieved options maintain accuracy during machining and operation.
- Cost efficient: Reduces machining time and material waste compared to machined solid bar.
Applications
This precision seamless tube is widely used for hydraulic cylinder barrels, pneumatic cylinders, precision machinery parts, automotive components, bearing sleeves, fluid control systems, gas springs and general precision mechanical applications.
Get a Quotation
We supply precision seamless tubes in carbon steel and alloy steel with various precision grades and surface finishes. Custom sizes, heat treatments and finishing services are available upon request. Contact our precision materials team for a detailed quotation.
