EAST AI Hydraulic Manufacturer
Since 2006
EASTAI
ST52
Max. 13m
H8 (customizable on request)
0.5-1/1000
Hydraulic cylinders for mobile equipment, industrial machinery, and heavy-duty systems
Wooden cases
0.1-0.4μm
Product Description
EASTAI’s ST52 Skived and Roller Burnished Tube is a high-precision steel tube specifically engineered for hydraulic cylinder applications. Using high-grade ST52 seamless steel, this product is processed with internal skiving and roller burnishing to achieve tight dimensional tolerance, high surface smoothness, and superior wear resistance. Our tubes meet or exceed international hydraulic cylinder standards and are trusted by OEMs and distributors worldwide.
| Parameter | Specification |
|---|---|
| Inner Diameter Range | 50 mm – 250 mm |
| Wall Thickness | 5 mm – 50 mm (as required) |
| Tube Length | Up to 13 meters |
| Tolerance (ID) | H8 |
| Surface Roughness (Ra) | ≤ 0.4 μm |
| Straightness | 0.5-1mm/1000mm |
| Tensile Strength | ≥ 580 MPa |
| Yield Strength | ≥ 460 MPa |
| Elongation | ≥ 22% |
| Standard | DIN 2391, EN 10305, ASTM A519 |
| MOQ | 1 Ton |
| Delivery Time | Within 7–10 days (for regular sizes) |
EASTAI operates with a high-efficiency production line dedicated to SRB and honed tubes. With advanced skiving and burnishing machines, we achieve a daily production capacity of 30 tons. Our in-house manufacturing capabilities enable us to handle both standard and customized orders promptly, ensuring consistent supply and lead time reliability.
ST52 Skived and Roller Burnished Tubes are widely used in high-performance hydraulic systems, especially in:
Hydraulic cylinders for construction and agricultural machinery
Lifting and hoisting equipment
Mining and drilling machinery
Industrial automation systems
These tubes are ideal for applications requiring smooth motion, high pressure resistance, and long service life.
We offer value-added services to meet your specific needs:
Cut-to-length service (±1mm accuracy)
Chamfering and deburring
Threading, welding prep, and port machining
Custom inner diameter polishing and finishing
Our in-house processing capability helps shorten your production cycle and reduce total cost.
Bundled with Steel Straps:
Every tube is packed in strong bundles with steel straps to prevent deformation during transit.
Anti-Rust Oil Coated:
Tubes are coated with SGS-approved anti-rust oil for long-term protection (up to 3 years).
Plastic Caps:
Ends are sealed with plastic caps to prevent entry of moisture and dust.
Optional Wooden Crates:
For export or fragile orders, we provide seaworthy wooden cases.
Labeling:
Each bundle is labeled with specifications, heat number, and traceability information.
Shipping Options:
By container (FCL/LCL), truck, or air freight based on client needs.
All SRB tubes are coated with premium anti-rust oil that complies with European standards and passes SGS testing, ensuring corrosion resistance for up to 3 years.
We maintain over 5,000 tons of ready stock and operate an 8,000 m² facility, allowing standard orders to be shipped within 7 days.
EASTAI is equipped with advanced production lines and high-end machinery capable of fulfilling special and customized orders efficiently. Our robust daily capacity of 30 tons ensures stable lead times and reliable delivery, even for urgent or large-volume projects.
We have the world's most advanced testing equipment and a strong quality inspection team; we ensure that the straightness of the SRB & Honed Tube is <0.4/1000mm, the inner diameter tolerance is H8 (or strictly controlled according to customer requirements), and the surface roughness is <0.15μm.
The RAW MATERIALS OF SRB&Honed tubes are from well-known steel mills in China, such as Bao steel, TPCO, Fengbao steel, Yegang steel, Hengyang steel, Shagang steel group, Huarun steel, etc. The good raw materials ensure that the finished honed tubes can bear high pressure and don’t deform in harsh environments, and work more stably.
By signing a written agreement with the customer, the risk is controlled at an extremely low level to provide the customer with a greater degree of safety and security.
We understand that every application is unique—and so are your technical requirements. EASTAI provides a full range of customization services for ST52 Skived and Roller Burnished Tubes to meet your specific hydraulic system needs:
Inner Diameter Range: 50mm – 250mm
Length: up to 13 meters or cut-to-length upon request
Wall Thickness: according to project load or pressure requirements
Custom boring, port holes, threads, or grooving
Chamfering, face milling, and welding bevel prep
CNC turning and drilling for hydraulic components
Can meet stricter tolerances than standard H8 upon request
Outer diameter tolerance control within ±0.50mm
Enhanced straightness and roundness requirements can be achieved
Oil sealing for long-term rust prevention
Phosphating or pickling for additional corrosion resistance
Customized color-coded or labeled ends for batch management
Logo or barcode stickers
Pallet size adaptation for container efficiency
Custom export-grade wooden boxes
Woven Bag Bundling
Logo or Barcode Stickers
Wooden Boxes
At EASTAI, we take quality seriously. All ST52 SRB & Honed Tubes are produced under strict quality systems to ensure full compliance with global industrial standards.
Raw materials sourced from certified steel mills (Baosteel, TPCO, Fengbao, etc.)
Material test reports (MTC) provided with every batch
Chemical composition and mechanical property tests conducted regularly
DIN 2391, EN 10305-1, ISO 6431 for hydraulic applications
Surface finish, tolerance, straightness comply with international cylinder design standards
SGS, TUV, BV inspection support upon request
Full documentation for export customs clearance (CO, Form E, CE Declaration, etc.)
Anti-rust oil meets EU RoHS & REACH regulations
Low-emission, eco-friendly oil sealing process approved
All packaging materials comply with international phytosanitary standards (ISPM15)
EASTAI is certified by Germanischer Lloyd, proving that our production and raw material supply chain meet the strict requirements of offshore and marine-grade hydraulic system manufacturers.
EASTAI serves clients across over 30 countries. We provide:
Technical support on material selection and application
After-sales consultation and quick response to quality issues
On-time delivery with tracking and progress updates
Your satisfaction is our long-term commitment.
Ready to optimize your hydraulic cylinder manufacturing? EASTAI offers flexible MOQ, fast lead times, and technical support.
Website: www.east-ai.com
Email: info@east-ai.com
Factory Area: 8,000 m² | Stock: 5,000 tons | Daily Output: 30 tons
