Honed & SRB Tube – EN 10305-1 E355 H8 Ra0.4, Mirror ID Finish for Hydraulic Cylinder Barrels

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