What Are Precision Tubes?
Per DIN 2391 and EN 10305, precision tubes — typically Cold Drawn Welded (CDW) or Cold Drawn Seamless (CDS) — offer exceptional dimensional accuracy and superior surface finish compared to hot-rolled alternatives. They are essential for applications requiring exact mechanical properties. Our hydraulic-grade tubes undergo rigorous testing for straightness, ovality, and internal smoothness per IS 3601 and DIN 2391/C.
- Tight tolerances on inner (ID) and outer (OD) diameters
- Excellent internal surface finish (Ra values suitable for honing)
- High tensile and yield strength
- Uniform mechanical properties throughout the length
Specifications We Stock
| Outer Diameter (OD) | 6mm to 150mm |
|---|---|
| Wall Thickness (WT) | 1mm to 15mm |
| Grades | DIN 2391 / EN 10305: ST35, ST45, ST52 |
| Lengths | Random lengths (4m-7m) or exact cut-to-length |
| Delivery Condition | BK (Cold Finished), BKW, BKS, GBK, NBK |
Common Applications
- Hydraulics & Pneumatics: Cylinder barrels and fluid lines.
- Automotive: Shock absorbers, steering columns, and axles.
- Heavy Machinery: Earthmoving equipment arms and actuators.
- Bicycles & Two-Wheelers: Frame fabrication and front forks.
Source Mills We Work With
We procure materials exclusively from highly reputed Indian and global steel mills, including:
TI MachiningISMT LimitedHeavy Metal & TubesMahalaxmi Seamless
Applicable Standards & Specifications
How To Order
- State exact ID, OD, and WT tolerances required.
- Specify the delivery condition (e.g., BK or NBK) to ensure correct hardness.
- Indicate if tubes require further processing like honing or skiving.
- Share required lengths and total quantity for precise costing.
Frequently Asked Questions
What is the difference between CDW and CDS precision tubes?
CDW (Cold Drawn Welded) starts as an ERW pipe that is cold drawn over a mandrel to improve tolerances and strength. CDS (Cold Drawn Seamless) starts as a seamless billet, offering higher pressure ratings and no weld seam.
Can these tubes be used directly as hydraulic cylinders?
Standard precision tubes require honing or skiving to achieve the mirror-like internal finish necessary for hydraulic seals. We can supply pre-honed (ready-to-use) tubes upon request.
What do delivery conditions like BK or NBK mean?
These indicate the final heat treatment. BK means cold finished (hard), offering max strength but low ductility. NBK means normalized, which relieves stress and improves ductility for bending.
Related
- Precision Tubes & Hydraulic — Kanpur wholesale supply — pricing, delivery zones, and grade options for buyers in UP and North India.
- Calculate the weight of Precision Tubes & Hydraulic for your BOQ — size, wall, and length to MT before requesting a quote.
Customers also ask about
Buying Guide
Best Pipes for Hydraulic Cylinder Tubing in IndiaRanked steel tube types for hydraulic cylinder barrels, covering bore tolerance, surface finish, and pressure ratings for Indian OEMs.Published Last reviewed