Our Honed and Skived & Roller Burnished (SRB) Tubes are manufactured from EN 10305-1 E355 cold drawn seamless steel tubes and precision processed to achieve exceptional surface smoothness (Ra ≤ 0.4 μm) and tight tolerance (H8).With a mirror-like internal bore finish, these tubes are specifically designed for use as hydraulic cylinder barrels, where low friction, long seal life, and high wear resistance are essential.
Typical Steel Grades
· EN 10305-1 E355 (standard)
· ST52.3 (DIN equivalent)
· 20MnV6 (alternative grade for machining)
· ASTM A519 1020 / 1026 (optional)
Common Sizes (OD × WT × ID)
·Ø40 mm × 5 mm (ID Ø30 mm)
·Ø63.5 mm × 6 mm (ID Ø51.5 mm)
·Ø90 mm × 8 mm (ID Ø74 mm)
·Ø100 mm × 10 mm (ID Ø80 mm)
·Ø125 mm × 12.5 mm (ID Ø100 mm)
·Ø150 mm × 15 mm (ID Ø120 mm)
Imperial sizes (inch-based) also available upon request.
Technical Specifications
·Standard: EN 10305-1, ISO H8 tolerance
·Condition: Cold Drawn + Honed or SRB
·Bore Tolerance: H8 (or tighter upon request)
·Surface Roughness: Ra ≤ 0.4 μm (honed) / Ra ≤ 0.2 μm (SRB)
·Straightness: ≤ 0.3 mm/m
·Roundness: ≤ 0.03 mm
Manufacturing Process
1. Cold Drawn Seamless Tube (E355) production
2. Heat Treatment (Normalization / Stress Relief)
3. Rough Boring (if required)
4. Honing → controlled abrasive finish for Ra ≤ 0.4 μm
5. Skiving & Roller Burnishing (optional alternative) → mirror ID finish Ra ≤ 0.2 μm
6. Final Inspection → roundness, straightness, tolerance, roughness checks
Key Features & Benefits
·Ready-to-assemble cylinder barrel → saves machining time
·Ultra-smooth bore finish → longer seal and piston life
·Excellent dimensional accuracy (H8) → ideal for hydraulic cylinders
·Available in both honed and SRB finishes
·Reduces maintenance costs by minimizing wear
Applications
·Hydraulic cylinder barrels (construction machinery, agricultural equipment)
·Pneumatic cylinders
·Heavy-duty lifting systems
·Press machines and industrial hydraulics
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 10305-1 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 10305-1 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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