Our EN 10305-2 Cold Drawn Welded (CDW) Honed & SRB Tubes are precision-processed to deliver mirror-like internal finishes (Ra ≤ 0.4 μm) and H8 tolerance, making them ideal for hydraulic cylinder barrels.Compared with seamless tubes (EN 10305-1), these welded tubes provide a cost-effective solution while maintaining excellent straightness, roundness, and surface finish, suitable for both industrial and mobile hydraulic applications.
Typical Steel Grades
·EN 10305-2 E355 (standard)
·ST52.3 (DIN equivalent)
·Other grades available upon request for specific mechanical properties
Common Sizes (OD × WT × ID)
·Ø40 mm × 5 mm
·Ø63.5 mm × 6 mm
·Ø90 mm × 8 mm
·Ø100 mm × 10 mm
·Ø125 mm × 12.5 mm
·Ø150 mm × 15 mm
Custom metric and imperial sizes available upon request.
Technical Specifications
·Standard: EN 10305-2, Cold Drawn Welded Tube
·Tolerance: H8 for OD & ID
·Surface Finish: Ra ≤ 0.4 μm (honed), Ra ≤ 0.2 μm (SRB)
·Straightness: ≤ 0.3 mm/m
·Roundness: ≤ 0.03 mm
·Length: Up to 12 m, cut-to-length available
Manufacturing Process
1. Welded Tube Production – forming and longitudinal ERW welding of high-quality strip steel
2. Normalization / Heat Treatment – ensures uniform grain structure and weld integrity
3. Cold Drawing Over Mandrel (CDW) – improves dimensional accuracy and mechanical properties
4. Honing – produces smooth ID surface
5. Skiving & Roller Burnishing (SRB) – optional mirror finish Ra ≤ 0.2 μm
6. Inspection – dimensional, straightness, roundness, and surface roughness checks
Key Features & Benefits
·Cost-effective alternative to seamless honed tubes
·Mirror-like inner surface for long-lasting hydraulic seals
·High precision (H8) for reliable cylinder assembly
·Available in honed or SRB finishes
·Suitable for medium-pressure hydraulic applications
Applications
·Hydraulic cylinders for construction and agricultural machinery
·Industrial hydraulic presses
·Pneumatic cylinders
·Heavy-duty lifting equipment
·Mobile machinery hydraulic systems
Suao is a professional manufacturer of high-precision cold drawn steel tubes, hydraulic tubes, and mechanical structure tubes, integrating R&D, production, inspection, and global sales. We operate two major production facilities covering over 36,000 square meters, with more than 200 employees and an annual output of 50,000+ tons, supplying customers across major industrial markets worldwide. As Suppliers of Honed & SRB Tube – EN 10305-2 E355 H8 Ra0.4, Mirror ID Finish for Hydraulic Cylinder Barrels, our integrated manufacturing capabilities include cold drawing, heat treatment, straightening, finishing, cutting, chamfering, and surface treatment. These are supported by a full range of advanced equipment for non-destructive testing, chemical analysis, and online dimensional monitoring—ensuring every tube meets stringent quality standards. We invest continuously in automation and smart manufacturing systems to enable flexible, high-mix, low-volume production. Custom Honed & SRB Tube – EN 10305-2 E355 H8 Ra0.4, Mirror ID Finish for Hydraulic Cylinder Barrels. Our products are widely used in construction machinery, hydraulic systems, automotive parts, wind energy, shipbuilding, railways, and oil & gas sectors. Certified to ISO 9001, ISO 14001, CE, and RoHS standards, Hongli is more than a manufacturer—we are a trusted long-term partner for global industrial clients.
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