Overview
Welcome to our Honed & Skived Roller Burnished (SRB) Hydraulic Cylinder Tubes category. We offer a complete range of precision tubes for hydraulic and pneumatic cylinders, manufactured to EN 10305-1, EN 10305-2, ASTM A519, and ASTM A513 standards.
All our tubes are cold drawn, honed, or SRB-processed, ensuring:
·Mirror-like inner surfaces
·Tight dimensional tolerances (H8 or better)
·Excellent straightness and roundness
·Long-lasting seal and piston performance
·This category covers both seamless and welded tubes, providing options for heavy-duty, medium-duty, and cost-effective applications.
Product Subcategories
1. EN 10305-1 Honed & SRB Tubes – Seamless
·Standard: EN 10305-1, E355
·Surface Finish: Ra ≤ 0.4 μm
·Tolerance: H8
·Applications: High-pressure hydraulic cylinders, construction machinery, industrial equipment
2. EN 10305-2 Honed & SRB Tubes – Welded (CDW)
·Standard: EN 10305-2, E355
·Surface Finish: Ra ≤ 0.4 μm
·Tolerance: H8
·Applications: Cost-effective medium-pressure hydraulic cylinders, agricultural and industrial machinery
3. ASTM A519 Honed & SRB Tubes – Seamless
·Grades: ST52 / 20MnV6 / 27SiMn
·Surface Finish: Ra ≤ 0.4 μm
·Tolerance: H8
·Applications: Heavy-duty hydraulic cylinders, North American and global markets
4. ASTM A513 Honed & SRB Tubes – Welded (CDW)
·Grades: ST52 / SAE 1026
·Surface Finish: Ra ≤ 0.4 μm
·Tolerance: H8
·Applications: Medium-pressure hydraulic cylinders, automotive, material handling
Why Choose Our Honed & SRB Hydraulic Tubes?
· Wide range of standards & grades for all markets
· Seamless and welded options for high and medium pressure applications
· Precision honed & SRB processing for minimal friction and maximum seal life
· Custom sizes available in metric and imperial units
· High straightness and dimensional accuracy for reliable cylinder assembly
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A honed tube for hydraulic cylinder is a precision-engineered seamless or welded steel tube that undergoes an internal surface finishing process known as honing. This process creates a cross-hatched microstructure on the inner bore, which is critical for optimal oil retention and piston seal performance. The resulting surface roughness typically ranges between Ra 0.1–0.4 µm, ensuring minimal friction and wear during reciprocating motion. At Jiangsu Suao Metal Product Co., Ltd., we produce honed tubes with tight dimensional tolerances—often within ±0.05 mm on inner diameter—and straightness under 0.3 mm/m, meeting the demanding requirements of high-pressure hydraulic systems.
SRB (Skived and Roller Burnished) tube is another high-performance option for hydraulic cylinder barrels, offering superior surface finish and mechanical properties compared to conventional honed tubes. The SRB process involves skiving to remove material and then roller burnishing to cold-work the surface, achieving a mirror-like finish with Ra values as low as 0.05 µm. This not only enhances corrosion resistance but also improves fatigue strength due to induced compressive residual stresses. As a manufacturer with integrated cold drawing and finishing lines, we at Suao can deliver SRB tubes in both carbon and alloy steel grades, tailored to operating pressures exceeding 350 bar.
The selection of base material significantly influences the performance of a hydraulic cylinder honed tube. Common grades include ST52 (E355), Ck45, 20MnV6, and 42CrMo4, each chosen based on required tensile strength, weldability, and hardenability. After cold drawing—which enhances dimensional accuracy and surface integrity—the tubes undergo stress-relief annealing to prevent distortion during subsequent machining or honing. We incorporate inline ultrasonic testing and eddy current inspection to detect subsurface defects, ensuring every hydraulic cylinder honed tube we supply meets ISO 8535-1 standards for hydraulic fluid power applications.
Beyond dimensional precision, surface condition plays a decisive role in the longevity and reliability of steel tubes for hydraulic cylinder barrels. To combat corrosion during storage and transport, we offer three primary surface treatments:
As a certified Custom Surface-Treated Steel Pipes – E-Coated, Phosphated, and Oiled manufacturer in China, we tailor these treatments to your logistics environment and assembly timeline.
| Parameter | Honed Tube | SRB Tube |
| Surface Roughness (Ra) | 0.1–0.4 µm | 0.02–0.08 µm |
| Production Lead Time | Moderate | Shorter (single-pass process) |
| Typical Wall Thickness Range | 4–40 mm | 6–30 mm |
| Best Suited For | Heavy-duty cylinders, long stroke applications | High-speed, high-cycle, or cleanroom environments |
Our dual-capability production lines allow us to recommend the optimal solution—whether honed or SRB—based on your specific duty cycle, pressure rating, and environmental exposure. With over 50,000 tons annual output and smart manufacturing integration, Jiangsu Suao ensures consistent quality across both product types.
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